A Tripartite Interaction Between Spartina alterniflora, Fusarium palustre, and the Purple Marsh Crab (Sesarma reticulatum) Contributes to Sudden Vegetation Dieback of Salt Marshes in New England
Open accessAbstract
Tripartite interactions are common and occur when one agent (an arthropod or pathogen) changes the host plant in a manner that alters the attack of the challenging agent. We examined herbivory from the purple marsh crab (Sesarma reticulatum) on Spartina alterniflora following exposure to drought or inoculation with Fusarium palustre in mecocosms in the greenhouse and in crab-infested creek banks along intertidal salt marshes. Initially, drought stress on S. alterniflora and disease from F. palustre were examined in the greenhouse. Then, a second challenger, the purple marsh crab, was introduced to determine how drought and disease from F. palustre affected the attraction and consumption of S. alterniflora. Plant height and shoot and root weights were reduced in plants subjected to severe drought treatment when compared with normally irrigated plants. When the drought treatment was combined with inoculation with F. palustre, plants were significantly more stunted and symptomatic, had less fresh weight, more diseased roots, and a greater number of Fusarium colonies growing from the roots (P < 0.001) than noninoculated plants. The effects were additive, and statistical interactions were not detected between drought and inoculation. Estimates of herbivory (number of grass blades cut or biomass consumption) by the purple marsh crab were significantly greater on drought-stressed, diseased plants than on healthy plants irrigated normally. Drought increased attraction to the purple marsh crab more than inoculation with F. palustre. However, when only mild drought conditions were imposed, plant consumption was greater on inoculated plants. Healthy, nonstressed transplants set into plots in crabinfested intertidal creek banks were grazed less each year than inoculated plants or plants that were exposed to drought. Several hypotheses relating to nutrition, chemotaxis, and visual attraction are presented to explain how stress from drought or disease might favor herbivory.
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Cites
Statistics
Claims the paper makes
4 of 38 cited sources checked · 1 supported · 0 flagged · accuracy not yet measured
- Interpretationcitation
The authors' findings agree with the general hypothesis that an abiotic stressor such as drought initiates SVD.
“Although our findings are in agreement with the general hypothesis that an abiotic stressor, such as drought, initiates SVD (2,18,33), this report is the first demonstration of a tripartite interaction between a crab, pathogen, and plant that hinders recovery from SVD.”
Quote in the paperNot a substantial claim1 of 3 sources checked - Premisecitation
In southern marshes, drought was a primary stressor driving the dieback.
“In southern marshes, drought was a primary stressor driving the dieback (2,33).”
Quote in the paperNot a substantial claim1 of 2 sources checked- cites [2] source
- cites [33] source
The Results and Discussion report that dieback coincided with extreme drought and that drought, together with reduced tidal flooding, may have decreased water availability or increased salinity. But the paper says the cause was unknown; it does not establish drought as the primary stressor driving the dieback. No page number is available in our copy. (LLM, conf=0.89)
Experimental — accuracy not yet measured
- Findingown data
Healthy, nonstressed transplants set into plots in crab-infested intertidal creek banks were grazed less each year than inoculated plants or plants that were exposed to drought.
“Healthy, nonstressed transplants set into plots in crabinfested intertidal creek banks were grazed less each year than inoculated plants or plants that were exposed to drought.”
Quote in the paperSubstantial claim - Findingown data
When irrigation was examined, most grazing occurred on plants exposed to severe drought, then mild drought, and the least on normal irrigation.
“When irrigation was examined, analysis of the HPC was averaged over drought treatment to reveal that most grazing occurred on plants exposed to severe drought, then mild drought, and the least on normal irrigation.”
Quote in the paperNot a substantial claim - Findingown data
In field trials, there was rarely any statistical difference in the degree of grazing on drought-stressed versus disease-stressed plants.
“There was rarely any statistical difference in the degree of grazing done to plants that were drought stressed versus plants stressed by disease.”
Quote in the paperNot a substantial claim
- Findingown data
When drought treatment was combined with inoculation with F. palustre, plants were significantly more stunted and symptomatic than noninoculated plants (P < 0.001).
“When the drought treatment was combined with inoculation with F. palustre, plants were significantly more stunted and symptomatic, had less fresh weight, more diseased roots, and a greater number of Fusarium colonies growing from the roots (P < 0.001) than noninoculated plants.”
Quote in the paperSubstantial claim - Findingown data
When the two drought treatments (mild and severe) were pairwise compared, there was no difference in grazing among noninoculated plants.
“Interestingly, when the two drought treatments (mild and severe) were pairwise compared, there was no difference in grazing among noninoculated plants.”
Quote in the paperNot a substantial claim - Findingown data
Averaging over drought treatments, inoculated plants had less fresh weight (P < 0.001) than noninoculated control plants.
“Averaging over the drought treatments, inoculated plants were significantly more stunted and symptomatic (P < 0.001) and had less fresh weight (P < 0.001), more diseased roots (P < 0.001), and a greater number of Fusarium colonies growing from the roots (P < 0.001) than noninoculated control plants.”
Quote in the paperSubstantial claim - Findingown data
The 20% reduction in fresh weight in the mild drought treatment was not significantly different from normal irrigation.
“The 20% reduction in the mild drought treatment was not significantly different from normal irrigation (control).”
Quote in the paperNot a substantial claim - Findingown data
Averaging over drought treatments, inoculated plants were significantly more stunted and symptomatic (P < 0.001) than noninoculated control plants.
“Averaging over the drought treatments, inoculated plants were significantly more stunted and symptomatic (P < 0.001) and had less fresh weight (P < 0.001), more diseased roots (P < 0.001), and a greater number of Fusarium colonies growing from the roots (P < 0.001) than noninoculated control plants.”
Quote in the paperSubstantial claim - Findingown data
Feeding by the purple marsh crab did not differ on inoculated or noninoculated plants exposed to severe drought or receiving normal irrigation.
“Feeding by the purple marsh crab did not differ on inoculated or noninoculated plants exposed to severe drought or receiving normal irrigation.”
Quote in the paperNot a substantial claim - Findingown data
When only mild drought conditions were imposed, plant consumption by the purple marsh crab was greater on inoculated plants than on noninoculated plants.
“However, when only mild drought conditions were imposed, plant consumption was greater on inoculated plants.”
- Also stated in: § Greenhouse herbivory experiments. · plain
“only inoculated plants that received the mild drought were statistically more grazed than their noninoculated control (Table 1).”
- Also stated in: § Greenhouse herbivory experiments. · plain
“However, plants exposed to a mild drought and then inoculated were grazed more heavily than noninoculated plants.”
Quote in the paperSubstantial claim - Also stated in: § Greenhouse herbivory experiments. · plain
- Findingnone given
Drought increased attraction to the purple marsh crab more than inoculation with F. palustre.
“Drought increased attraction to the purple marsh crab more than inoculation with F. palustre.”
Quote in the paperSubstantial claim - Findingown data
Severe drought treatment reduced plant height and shoot and root weights compared with normally irrigated plants.
“Plant height and shoot and root weights were reduced in plants subjected to severe drought treatment when compared with normally irrigated plants.”
Quote in the paperNot a substantial claim - Findingown data
When drought treatment was combined with inoculation with F. palustre, plants had a greater number of Fusarium colonies growing from the roots than noninoculated plants (P < 0.001).
“When the drought treatment was combined with inoculation with F. palustre, plants were significantly more stunted and symptomatic, had less fresh weight, more diseased roots, and a greater number of Fusarium colonies growing from the roots (P < 0.001) than noninoculated plants.”
Quote in the paperSubstantial claim - Findingown data
Averaging over drought treatments, inoculated plants had more diseased roots (P < 0.001) than noninoculated control plants.
“Averaging over the drought treatments, inoculated plants were significantly more stunted and symptomatic (P < 0.001) and had less fresh weight (P < 0.001), more diseased roots (P < 0.001), and a greater number of Fusarium colonies growing from the roots (P < 0.001) than noninoculated control plants.”
Quote in the paperSubstantial claim - Findingown data
Plants inoculated with F. palustre had a greater level of grazing than plants that were not inoculated (P = 0.017).
“Plants inoculated with F. palustre had a greater level of grazing than plants that were not inoculated (P = 0.017).”
Quote in the paperSubstantial claim - Findingown data
Averaging over drought treatments, inoculated plants had a greater number of Fusarium colonies growing from the roots (P < 0.001) than noninoculated control plants.
“Averaging over the drought treatments, inoculated plants were significantly more stunted and symptomatic (P < 0.001) and had less fresh weight (P < 0.001), more diseased roots (P < 0.001), and a greater number of Fusarium colonies growing from the roots (P < 0.001) than noninoculated control plants.”
Quote in the paperSubstantial claim - Findingown data
The integrated herbivory progress curve was 5.2 cut blade days for healthy control versus 20.6 cut blade days for stressed-diseased plants (P < 0.001).
“The integrated HPC was computed and found to be 5.2 cut blade days (healthy control) versus 20.6 cut blade days (stressed-diseased) (P < 0.001).”
Quote in the paperSubstantial claim - Findingown data
In 2013 field trials, when percent estimated biomass loss was analyzed after 24 h, healthy plants grown under normal irrigation had significantly less grazing than the other treatments (P = 0.032).
“However, in 2013, when the percent estimated biomass loss was analyzed after 24 h, the healthy plants grown under normal irrigation had significantly less grazing than the other treatments (P = 0.032) (data not shown).”
Quote in the paperNot a substantial claim - Findingown data
Herbivory by the purple marsh crab was significantly greater on drought-stressed, diseased plants than on healthy, normally irrigated plants.
“Estimates of herbivory (number of grass blades cut or biomass consumption) by the purple marsh crab were significantly greater on drought-stressed, diseased plants than on healthy plants irrigated normally.”
- Also stated in: § Greenhouse herbivory experiments. · plain
“In all three repetitions of the studies, the purple marsh crab preferentially grazed on drought-stressed, diseased plants more than the healthy plants, as shown by the number of leaf blades cut (Fig. 3).”
Quote in the paperSubstantial claim - Also stated in: § Greenhouse herbivory experiments. · plain
- Findingreasoning
In 2013 field trials, no statistical significance was observed in the herbivory progress curve after 4 days.
“In 2013, no statistical significance was observed in the HPC after the 4 days, probably due to excessive pressure from the crabs.”
Quote in the paperNot a substantial claim - Findingown data
When drought treatment was combined with inoculation with F. palustre, plants had less fresh weight than noninoculated plants (P < 0.001).
“When the drought treatment was combined with inoculation with F. palustre, plants were significantly more stunted and symptomatic, had less fresh weight, more diseased roots, and a greater number of Fusarium colonies growing from the roots (P < 0.001) than noninoculated plants.”
Quote in the paperSubstantial claim - Findingown data
In 2012 field trials, both repetitions in time showed the least amount of grazing on healthy plants grown under normal irrigation.
“However, statistically similar trends emerged in 2012, where both repetitions in time showed the least amount of grazing on healthy plants grown under normal irrigation.”
Quote in the paperNot a substantial claim - Findingown data
When drought treatment was combined with inoculation with F. palustre, plants had more diseased roots than noninoculated plants (P < 0.001).
“When the drought treatment was combined with inoculation with F. palustre, plants were significantly more stunted and symptomatic, had less fresh weight, more diseased roots, and a greater number of Fusarium colonies growing from the roots (P < 0.001) than noninoculated plants.”
Quote in the paperSubstantial claim - Findingnone given
Herbivory was usually greatest on drought-stressed plants.
“Herbivory was usually greatest on drought-stressed plants.”
Quote in the paperSubstantial claim - Findingown data
In situ, drought and inoculation treatments affected the integrated value of herbivory progress consumption by the purple marsh crab.
“Effect of different drought treatments with and without inoculation with Fusarium palustre on the integrated value of herbivory progress consumption by the purple marsh crab (Sesarma reticulatum) in situ in a crab-infested intertidal creek bank.”
Quote in the paperSubstantial claim - Findingown data
Inoculation with F. palustre affected fresh weight of S. alterniflora (P < 0.001).
“Effect of different drought treatments with and without inoculation with Fusarium palustre on fresh weight (upper left: drought; P < 0.001; inoculation with F. palustre, P < 0.001)”
Quote in the paperSubstantial claim - Findingreasoning
Infected or drought-stressed plants were grazed more heavily by the purple marsh crab than noninfected plants in both mesocosms and in situ.
“Infected or drought-stressed plants were grazed more heavily by the purple marsh crab than noninfected plants in both mecocosms and in situ.”
Quote in the paperSubstantial claim - Findingown data
In preliminary trials, healthy S. alterniflora transplants sprayed with DMSO at 2.5 μmol/ml and set in mesocosms with purple marsh crabs were grazed significantly more in the first 24 h than untreated control plants (P > 0.001).
“In preliminary trials, healthy S. alterniflora transplants sprayed with DMSO at 2.5 µmol/ml and set in mecocosms with purple marsh crabs were grazed significantly more in the first 24 h than untreated control plants (P > 0.001) (unpublished data).”
Quote in the paperSubstantial claim - Findingown data
Plants exposed to both drought and inoculation resulted in an averaged 31% mortality compared with 3% mortality with drought alone.
“Plants exposed to both treatments resulted in an averaged 31% mortality compared with 3% mortality with drought alone.”
Quote in the paperSubstantial claim - Findingown data
In mesocosm trials, the integrated value under averaged curves was 5.2 cut blade days for healthy control versus 20.6 cut blade days for stressed and diseased plants (P < 0.001).
“The integrated value under the averaged curves was 5.2 cut blade days (healthy control) versus 20.6 cut blade days (stressed and diseased) (P < 0.001).”
Quote in the paperSubstantial claim - Findingnone given
In many instances, inoculation of severe drought-stressed plants with F. palustre had no effect on the amount of biomass consumed by the purple marsh crab compared with noninoculated plants.
“Many times, inoculation of severe drought-stressed plants with F. palustre played no effect in the amount of biomass consumed by the purple marsh crab when compared with noninoculated plants.”
Quote in the paperNot a substantial claim - Findingreasoning
An overriding factor that governed all interactions was drought.
“An overriding factor that governed all interactions was drought.”
Quote in the paperSubstantial claim - Findingreasoning
In situ studies were variable but consistent in that healthy plants were grazed the least.
“In situ studies were variable but consistent, in that plants that were healthy were grazed the least.”
Quote in the paperNot a substantial claim - Findingown data
Drought treatment affected fresh weight of S. alterniflora (P < 0.001).
“Effect of different drought treatments with and without inoculation with Fusarium palustre on fresh weight (upper left: drought; P < 0.001; inoculation with F. palustre, P < 0.001)”
Quote in the paperSubstantial claim - Findingown data
Drought treatment affected number of Fusarium colonies per cm root (P < 0.001).
“the number of colonies of Fusarium spp.per centimeter of root of Spartina alterniflora (lower right: drought, P < 0.001; inoculation with F. palustre, P = 0.02)”
Quote in the paperSubstantial claim - Findingown data
Inoculation with F. palustre affected number of Fusarium colonies per cm root (P = 0.02).
“the number of colonies of Fusarium spp.per centimeter of root of Spartina alterniflora (lower right: drought, P < 0.001; inoculation with F. palustre, P = 0.02)”
Quote in the paperSubstantial claim - Findingown data
Inoculation with F. palustre affected fraction of diseased roots (P < 0.001).
“fraction of disease roots (lower left: drought, P < 0.001; inoculation with F. palustre, P < 0.001)”
Quote in the paperSubstantial claim - Findingown data
Drought treatment affected fraction of diseased roots (P < 0.001).
“fraction of disease roots (lower left: drought, P < 0.001; inoculation with F. palustre, P < 0.001)”
Quote in the paperSubstantial claim - Findingown data
Inoculation with F. palustre affected disease severity ratings (P < 0.001).
“disease severity ratings (upper right: drought, P < 0.001; inoculation with F. palustre, P < 0.001)”
Quote in the paperSubstantial claim - Findingown data
Drought treatment affected disease severity ratings (P < 0.001).
“disease severity ratings (upper right: drought, P < 0.001; inoculation with F. palustre, P < 0.001)”
Quote in the paperSubstantial claim - Premisecitation
Fungal incidence was higher in plants in SVD sites than in healthy marshes (16% in SVD sites and <1% in healthy sites).
“Fungal incidence was higher in plants in SVD sites than in healthy marshes (16% in SVD sites and <1% in healthy sites) (15).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [15] Elmer, W. H., LaMondia, J. A., and Caruso, F. 2011. Association between Fusarium spp. on Spartina alterniflora and dieback sites in Connecticut and Massachusetts. Estuar. Coasts. doi:10.1007/s12237-011-9448-9 source
- Interpretationown data
A tripartite interaction between Spartina alterniflora, Fusarium palustre, and the purple marsh crab (Sesarma reticulatum) contributes to sudden vegetation dieback of salt marshes in New England.
“A tripartite interaction between Spartina alterniflora, Fusarium palustre, and the purple marsh crab (Sesarma reticulatum) contributes to sudden vegetation dieback of salt marshes in New England.”
Quote in the paperSubstantial claim- Rests on an assumption: Spartina alterniflora plants on the perimeter of SVD sites are commonly more stressed and stunted than plants more distal to the SVD site.
- Premisecitation
High densities of the herbivorous purple marsh crab (Sesarma reticulatum) are found in SVD sites in New England.
“Another interacting stressor found in SVD sites in New England are high densities of the herbivorous purple marsh crab (Sesarma reticulatum Say) (27) (Fig. 1)”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [27] source
- Premisecitation
Considerable loss of marsh biomass can be attributed to the purple marsh crab.
“and considerable loss of marsh biomass can be attributed to this invertebrate.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [27] source
- Premisecitation
Surveys show the fungus F. palustre to be endophytic on healthy plants long before herbivory by crab is evident.
“The current study did not examine the role of crab grazing on infection by F. palustre, because surveys show the fungus to be endophytic on healthy plants long before herbivory by crab is evident (18).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [18] source
- Study design and conductreasoning
Visual estimates of biomass disappearance used to measure herbivory could be biased because drought- or disease-stressed plants were smaller than control plants.
“It was recognized that these estimates could be biased because the drought-or disease-stressed plants were smaller than control plants.”
Quote in the paperSubstantial claim - Interpretationown data
This report is the first demonstration of a tripartite interaction between a crab, pathogen, and plant that hinders recovery from SVD.
“Although our findings are in agreement with the general hypothesis that an abiotic stressor, such as drought, initiates SVD (2,18,33), this report is the first demonstration of a tripartite interaction between a crab, pathogen, and plant that hinders recovery from SVD.”
Quote in the paperSubstantial claim - Premisecitation
Mortality was more common when Fusarium spp. belonging to the G. fujikuroi species complex were present.
“Mortality was shown to be more common when Fusarium spp. that belonged to the G. fujikuroi species complex were present (18,42).”
Quote in the paperNot a substantial claim0 of 2 sources checked- cites [18] source
- cites [42] Useman, S., and Schneider, R. W. 2005. The possible role of plant pathogens in Louisiana's brown marsh syndrome. In: Proc. 14th Bienn. Coastal Zone Conf. New Orleans, LA.
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Premisecitation
Plants in dieback areas in Georgia had higher levels of Si than plants in healthy marshes.
“It was surprising that plants in dieback areas in Georgia had higher levels of Si than plants in healthy marshes (32), leading one to speculate that structural integrity may not be a governing factor in the crab's selection for consumption.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [32] source
- Interpretationown data
The current study demonstrates that drought, fungal infection, and herbivory can work in concert to hinder recovery from SVD.
“The current study demonstrates that drought, fungal infection, and herbivory can work in concert to hinder recovery from SVD.”
Quote in the paperSubstantial claim - Premisenone given
The Palmer Hydrological Drought Index reports a few brief periods of drought (>2.0) in Connecticut during the 2000-to-2002 periods when SVD was noted.
“Although the Palmer Hydrological Drought Index reports a few brief periods of drought (>2.0) in Connecticut during the 2000-to-2002 periods when SVD was noted, it is not clear whether shortterm drought stress would have the same effect as prolonged periods (<3.0).”
Quote in the paperNot a substantial claim - Interpretationown data
Extended periods of drought that usually preceded SVD did not occur to the same degree in northeastern marshes as observed in southern marshes.
“However, the extended periods of drought that usually preceded SVD did not occur to the same degree in the northeastern marshes as observed in the southern marshes.”
Quote in the paperSubstantial claim - Premisecitation
S. alterniflora contains dimethylsulfoniopropionate (DMSP), a naturally occurring putative osmolyte, that is oxidized to dimethylsulfoxide (DMSO) during periods of stress.
“However, S. alterniflora is unique in that it contains dimethylsulfoniopropionate (DMSP), a naturally occurring putative osmolyte, that is oxidized to dimethylsulfoxide (DMSO) during periods of stress (28).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [28] source
- Classified as probably not a substantial claim. 28
- May combine two claims. 14
Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationThe snail Littoraria irrorata climbs stressed S. alterniflora stems and scores the tissue to promote sporulation of Phaeosphaeria spp. and Mycosphaerella spp. in the wounds, then returns after a period of time to feed on the fungi.
“The snail climbs stressed S. alterniflora stems and scores the tissue to promote sporulation of Phaeosphaeria spp.and Mycosphaerella spp. in the wounds, then returns after a period of time to feed on the fungi (36,37).”
Quote in the paperNot a substantial claim1 of 2 sources checked- cites [36] source
The paper’s discussion reports that Littoraria irrorata wounds live Spartina leaves, promotes fungal growth, and consumes the resulting fungi. It identifies Phaeosphaeria and Mycosphaerella as probable fungi in the wounds, but does not establish sporulation, specifically stressed stems, or a delayed return to feed. (LLM, conf=0.86)
Experimental — accuracy not yet measured - cites [37] source
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationWhen the herbivore is the initial agent, plants frequently activate metabolic pathways that produce jasmonic acid, which cascades many metabolic signals involved in disease resistance.
“Alternatively, when the herbivore is the initial agent, plants frequently activate metabolic pathways that produce jasmonic acid that, in turn, cascade many metabolic signals involved in disease resistance (1,20,23,24).”
Quote in the paperNot a substantial claim1 of 3 sources checked- cites [1] source
The ‘Signal transduction in plant defenses’ section says plant-consumer elicitors and damage can lead to accumulation of jasmonic acid and other defense-related hormones. It does not describe jasmonic acid as generally cascading signals for disease resistance; the ‘Suppression via the jasmonate-salicylate antagonism’ section instead explains that activating JA defenses can inhibit salicylic-acid-dependent defenses against certain pathogens. Page numbers were not available in our copy. (LLM, conf=0.84)
Experimental — accuracy not yet measured - cites [20] source
- cites [23] source
May combine two claims.
Findingown dataThe effects of drought and inoculation were additive, and no statistical interactions were detected between drought and inoculation.
“The effects were additive, and statistical interactions were not detected between drought and inoculation.”
- Also stated in: § Greenhouse drought and disease experiments. · plain
“there were no statistical interactions between the irrigation treatments and inoculation with F. palustre for any of the measured variables.”
Quote in the paperNot a substantial claim- Also stated in: § Greenhouse drought and disease experiments. · plain
May combine two claims.
Findingown dataIn field transplants in crab-infested salt marshes in Madison, CT (2011-2013), grazing by the purple marsh crab was least on healthy, non-drought-stressed plants and greatest on drought-stressed or F. palustre-inoculated plants.
“However, the rankings generated from Kruskal-Wallis revealed that the least amount of grazing was always observed on healthy plants that were not drought stressed and greatest on stressed or inoculated plants (Fig. 4).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataSevere drought treatment reduced fresh weight by 72% compared with normal irrigation and by 65% compared with mild drought treatment.
“Averaging over the inoculation treatment, the severe drought treatment reduced fresh weight by 72% when compared with normal irrigation (control) and by 65% when compared with mild drought treatment.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataA small number of root lesions were observed on noninoculated plants but these lesions did not give rise to Fusarium colonies.
“A small number of root lesions were also observed on noninoculated plants but these lesions did not give rise to Fusarium colonies (Fig. 2).”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing), S4 (based).
Findingnone givenNo such attractants have been identified.
“No such attractants have been identified.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataIn the current study, statistical interactions between drought stress and inoculation with F. palustre were not seen, but the damaging effects were additive.
“In the current study, statistical interactions between drought stress and inoculation with F. palustre were not seen but the damaging effects were additive.”
Quote in the paperSubstantial claimMay combine two claims.
FindingreasoningThe drought treatment alone was rarely fatal in these studies, but when combined with inoculation or herbivory, a greater percentage of plants died or was consumed by the crab, respectively.
“The drought treatment alone was rarely fatal in these studies but, when combined with inoculation or herbivory, a greater percentage of plants died or was consumed by the crab, respectively.”
Quote in the paperSubstantial claimMay combine two claims.
Findingnone givenAll agents-drought, fungus, and crab, and their combination-were deleterious to the host.
“All agents-drought, fungus, and crab, and their combination-were deleterious to the host.”
Quote in the paperSubstantial claimMay combine two claims.
Study design and conductown dataIn 2011 field trials, only two plots were examined, and variability prevented statistical separation of grazing among treatments.
“Because only two plots were examined in 2011, the variability prevented statistical separation.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductown dataData from repetitions from greenhouse experiments were pooled after satisfying the requirement for a nonsignificant treatment-repetition interaction.
“After satisfying the requirement for a nonsignificant treatment-repetition interaction, data sets were pooled and analyzed for treatment interactions as randomized blocked factorial designs.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductnone givenThe mecocosm studies were not designed to test for interactions.
“The mecocosm studies were not designed to test for interactions.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationScientists in Louisiana observed that plants inoculated with species in the G. fujikuroi species complex were significantly more diseased when drought stressed.
“Scientists in Louisiana observed that plants inoculated with species in the G. fujikuroi species complex were significantly more diseased when plants were drought stressed (42).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [42] Useman, S., and Schneider, R. W. 2005. The possible role of plant pathogens in Louisiana's brown marsh syndrome. In: Proc. 14th Bienn. Coastal Zone Conf. New Orleans, LA.
Not checked in the free run.
May combine two claims.
PremisecitationStudies in Georgia found that the DMSO/DMSP ratio was a sensitive indicator of presymptomatic stress in S. alterniflora and was consistently greater in leaves and stems of plants in dieback sites.
“Studies in Georgia found that the DMSO/DMSP ratio was a sensitive indicator of presymptomatic stress in S. alterniflora and was consistently greater in leaves and stems of plants in dieback sites (32).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [32] source
Classified as probably not a substantial claim.
PremisecitationFusarium spp. produce extracellular cellulolytic enzymes that may affect the structural strength of S. alterniflora stems.
“Fusarium spp.produce extracellular cellulytic enzymes that may affect the structural strength of S. alterniflora stems (9,41).”
Quote in the paperSubstantial claim0 of 2 sources checkedProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationPlant infection with many microbes can often lead to activation of the systemic-acquired resistant pathway, which decreases susceptibility to insect herbivores.
“Plant infection with many microbes can often lead to activation of the systemic-acquired resistant pathway (13) which, in turn, decreases susceptibility to insect herbivores (39).”
Quote in the paperNot a substantial claim0 of 2 sources checkedProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationIn studies with Barley yellow dwarf virus on wheat, significantly more aphids and extractable volatiles were found above headspaces of infected plants than above headspaces of noninfected plants.
“In studies with Barley yellow dwarf virus on wheat, significantly more aphids and extractable volatiles were found above headspaces of infected plants than above headspaces of noninfected plants (29).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [29] Jimenez-Martinez E. S., 2004, Entomol. source
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationReduction of insect damage has been achieved following inoculation of plant roots with plant-growth-promoting rhizobacteria.
“Reduction of insect damage has been achieved following inoculation of plant roots with plantgrowth-promoting rhizobacteria (43).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [43] source
Probably not a substantial claim: may not pass S3 (load-bearing).
InterpretationreasoningFungal enzymatic digestion of cellulose and hemicellulose components may make the plant more digestible and ultimately more nutritious to the purple marsh crab.
“On the other hand, fungal enzymatic digestion of the cellulose and hemicellulose components may also make the plant more digestible and, ultimately, more nutritious to the purple marsh crab.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationVolatiles are an important attractant for insect arthropods to diseased plants.
“However, volatiles are an important attractant for insect arthopods to diseased plants.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [29] Jimenez-Martinez E. S., 2004, Entomol. source
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationMany tripartite interactions report a positive effect, where a challenging microorganism alters the plant to become more resistant to herbivory.
“Many tripartite interactions also report a positive effect, where a challenging microorganism alters the plant to become more resistant to herbivory.”
Quote in the paperNot a substantial claim0 of 3 sources checkedProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationOn other crops, brief moisture deficits can predispose plants and allow increased ingress of Fusarium pathogens into plant roots.
“On other crops, brief moisture deficits can predispose plants and allow increased ingress of Fusarium pathogens into plant roots (14,35).”
Quote in the paperNot a substantial claim0 of 2 sources checkedProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationKruess observed that infection of Canada Thistle with Phoma destructiva resulted in reduced oviposition, survival, growth, and pupal biomass of the beetle Cassida rubiginosa compared with healthy plants.
“Kruess (30) observed that infection of Canada Thistle with Phoma destructiva Plowr.resulted in reduced oviposition, survival, growth, and pupal biomass of the beetle Cassida rubiginosa O. F. Müller when compared with healthy plants.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [30] source
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationCastle and Berger observed increased growth rates of the green peach aphid on virus-infected potato plants.
“Castle and Berger (7) observed increased growth rates of the green peach aphid on virus-infected potato plants.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [7] Castle S. J, 1993, Appl. source
May combine two claims.
Interpretationown dataBoth biotic (fungal) and abiotic (drought) stressors altered the attractiveness or palatability of the plant, increasing the probability of being grazed by the purple marsh crab.
“Both biotic (fungal) and abiotic (drought) stressors altered the attractiveness or palatability in the plant, increasing the probability of being grazed by the purple marsh crab.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S2 (checkable), S3 (load-bearing).
InterpretationreasoningThese findings may provide some insight into how the landscape of certain intertidal creeks in New England can remain denuded for decades whereas others recover over time and yet others remain unaffected.
“However, these findings may provide some insight into how the landscape of certain intertidal creeks in New England can remain denuded for decades whereas others recover over time and yet others remain unaffected.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationMaize plants infected with stalk rot caused by Colletotrichum graminicola supported European corn borer larvae that developed approximately 20% faster than on healthy control tissue.
“Maize plants infected with stalk rot caused by Colletotrichum graminicola (Ces.)G. W. Wilson supported European corn borer larvae that developed approximately 20% faster than on healthy control tissue (6).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [6] source
Probably not a substantial claim: may not pass S3 (load-bearing).
Interpretationnone givenThere is no indication that the purple marsh crab feeds directly on fungi.
“There is no indication that the purple marsh crab feeds directly on fungi, as was observed for the snail Littoraria irrorata Say in southern marshes.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationInfected stressed plants respire faster and radiate more in the infrared range than healthy plants.
“Infected stressed plants respire faster and radiate more in the infrared range than healthy plants (26).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [26] Hellebrand H. H., 2006, Int. Agrophys.
Probably not a substantial claim: may not pass S3 (load-bearing).
InterpretationreasoningThere are at least three putative mechanisms, not mutually exclusive, that might explain the increased herbivory on stressed plants.
“There are at least three putative mechanisms, not mutually exclusive, that might explain the increased herbivory on stressed plants.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Interpretationown dataAnother possible explanation may involve chemotaxis, where stressed plants may emit volatiles that attract crabs.
“Another possible explanation may involve chemotaxis, where stressed plants may emit volatiles that attract crabs.”
Quote in the paperNot a substantial claimClassified as probably not a substantial claim.
Study design and conductreasoningTo compensate for potential bias in visual estimates, plants of relatively equal size were paired so that percent losses would be reflective of the treatment.
“To compensate for this potential bias, plants of relatively equal size were paired so that percent losses would be reflective of the treatment.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S1 (asserted), S3 (load-bearing), S4 (based).
InterpretationcitationA last possible explanation that needs validation may be a visual response, where the crab is attracted to certain wavelengths emitted from stressed plants.
“A last possible explanation that needs validation may be a visual response, where the crab is attracted to certain wavelengths emitted from stressed plants.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing), S4 (based).
InterpretationreasoningOne putative mechanism is a direct effect on the nutritional status of the plant, in that disease-stressed plants may be easier to mechanically harvest, consume, and digest.
“One is the direct effect on the nutritional status of the plant, in that disease-stressed plants may be easier to mechanically harvest, consume, and digest.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationEndophytes in the family Clavicipitaceae render their grass host more toxic to large herbivores.
“Endophytes in the family Clavicipitaceae render their grass host more toxic to large herbivores (10).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [10] source
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationIn many systems, increased attraction to and increased fecundity of an herbivore occurs following host infection by a plant pathogen, causing negative effects to the host.
“Negative effects to the host have been observed in many systems where increased attraction to and increased fecundity of an herbivore occurs following host infection by a plant pathogen (21).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [21] Hammond, A. M., and Hardy, T. N. 1988. Quality of diseased plants as hosts for insects. Pages 657-672 in: Plant Stress-Insect Interactions. E.A. Heinrichs, ed. Wiley Press, New York.
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
InterpretationcitationStructural integrity may not be a governing factor in the crab's selection for consumption.
“It was surprising that plants in dieback areas in Georgia had higher levels of Si than plants in healthy marshes (32), leading one to speculate that structural integrity may not be a governing factor in the crab's selection for consumption.”
Quote in the paperNot a substantial claimMay combine two claims.
InterpretationreasoningBecause Fusarium colonists are more endophytic than epiphytic, and because the purple marsh crab consumes the entire plant tissue, it is more likely that some mechanism other than direct fungal feeding is operative.
“Because Fusarium colonists are more endophytic than epiphytic, and because the purple marsh crab consumes the entire plant tissue, it is more likely that some mechanism other than direct fungal feeding is operative.”
Quote in the paperSubstantial claim
The paper relies on this without support.
Spartina alterniflora plants on the perimeter of SVD sites are commonly more stressed and stunted than plants more distal to the SVD site.
“Second, Spartina alterniflora plants on the perimeter of SVD sites are commonly more stressed and stunted than plants more distal to the SVD site.”
The paper relies on this without support.
The experimental protocol of an initial fungal attack followed by crab challenge reflects the natural sequence of the tripartite interaction in SVD.
“The tripartite interaction was studied utilizing a general protocol where an initial inducing attack on a plant by one agent (fungus) was followed by a second challenge by an organism of the other type (crab).”
The paper relies on this without support.
The drought treatments imposed in the experiments mimic natural drought conditions relevant to SVD in New England.
“In addition, drought was imposed as a separate treatment to examine its role in the interaction between plant, fungus, and crab.”
The paper relies on this without support.
The purple marsh crab is the herbivore responsible for the grazing observed in the field and mesocosm studies.
“Two adult purple marsh crabs (Sesarma reticulatum) grazing on Spartina alterniflora.”
The paper relies on this without support.
Visual estimates of biomass disappearance accurately reflect crab herbivory after pairing plants of equal size.
“To compensate for this potential bias, plants of relatively equal size were paired so that percent losses would be reflective of the treatment.”
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Fusarium colony P values disagree
MinorThe results report P < 0.001 for the inoculation effect on Fusarium colonies, while the Figure 2 caption reports P = 0.02 for that effect.
“a greater number of Fusarium colonies growing from the roots (P < 0.001) than noninoculated control plants.”
“the number of colonies of Fusarium spp.per centimeter of root of Spartina alterniflora (lower right: drought, P < 0.001; inoculation with F. palustre, P = 0.02).”
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Self-citation(2006) · OpenAgrar · Cited by 25 · see citing works
STUDIES ON THE SUPPRESSION OF FUSARIUM CROWN AND ROOT ROT OF ASPARAGUS WITH NACL
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Self-citation(2011) · CrossRef Listing of Deleted DOIs · doi:10.1023/a:1002907604294
Flagged first, then by citations
Research works printed but not linked: 12
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- Hammond, A. M., and Hardy, T. N. 1988. Quality of diseased plants as hosts for insects. Pages 657-672 in: Plant Stress-Insect Interactions. E.A. Heinrichs, ed. Wiley Press, New York.
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Sorted by citations
Watson, E. B., Wigand, C., Davey, E. W., Andrews, H. M., Bishop, J., & Raposa, K. B. (2016) · Estuaries and Coasts · doi:10.1007/s12237-016-0069-1 · Cited by 163 · see citing works
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“Higher inundation may also lead to fungal infection and herbivory contributing a combined role in plantmortality (Elmer 2014).”
BackgroundBurrowing and foraging activity of marsh crabs under different inundation regimes
Szura, K., McKinney, R. A., Wigand, C., Oczkowski, A., Hanson, A. R., Gurak, J. A., & Gárate, M. (2016) · Journal of Experimental Marine Biology and Ecology · doi:10.1016/j.jembe.2016.10.029 · Cited by 22 · see citing works
“Possible causes for marsh loss include human alterations of the marsh landscape (Bertness et al., 2002), eutrophication (Deegan et al., 2012), drought (McKee et al., 2004), disease (Elmer, 2014), and herbivory (Coverdale et al., 2012).”
BackgroundResponse of Sediment Bacterial Communities to Sudden Vegetation Dieback in a Coastal Wetland
Elmer, W. H., Thiel, P., & Steven, B. T. (2017) · Phytobiomes Journal · doi:10.1094/pbiomes-09-16-0006-r · Cited by 12 · see citing works
“…(Schultz et al. 2016), and drought (McKee et al. 2004) have been proposed as the cause, or contributing to the development of SVD. Regional differences or interactions between different factors may play a role in the difficulty in identifying a unified explanation of SVD development (Elmer 2014).”
BackgroundSelf-citationLumibao, C. Y., Harris, G., & Birnbaum, C. (2024) · Estuaries and Coasts · doi:10.1007/s12237-024-01343-w · Cited by 14 · see citing works
“F. palustre has been associated with the dieback of the saltmarsh grass, S. alterniflora , in its native North American salt marshes (Elmer 2014; Li et al. 2014).”
Zhao, Y., Li, Y., Jin, Y., et al. (2022) · Journal of Environmental Management · doi:10.1016/j.jenvman.2022.115639 · Cited by 10 · see citing works
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Pathogenic Microfungi Associated with Spartina in Salt Marshes
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Self-citationIntraspecific variation in plant–fungal interactions across tidal elevation in a salt marsh
Hanley, T. C., Gehring, C. A., Deckert, R. J., Mortazavi, B., Richards, C. L., & Hughes, A. R. (2025) · New Phytologist · doi:10.1111/nph.70262 · Cited by 4 · see citing works
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Lundholm, J. T., Williams, K. J., Hodgson, E., et al. (2026) · Wetlands Ecology and Management · doi:10.1007/s11273-026-10113-3
“While her-bivory, pathogens and discrete disturbance events leading to erosion or other detrimental changes can rapidly kill wetland plants (Elmer 2014), long-term increases in tidal flooding are more likely to cause stress to plants, resulting in reduced growth rates, failure to reproduce and…”
Chen, L., Ming, W., Zhou, M., Fang, Y., Ji, T., Xia, R., Bai, M., Wang, Z., & Shen, J. (2025) · Animals · doi:10.3390/ani15192855
Heberlein, E. T., Mayes, M., Morgan, B. E., et al. (2025) · Water Resources Research · doi:10.1029/2024wr038287
“…function of salt marshes is largely determined by hydrodynamic conditions and sediment supply, and these physical characteristics are significantly impacted by submerged vegetation and even marsh herbivore population dynamics (Elmer, 2014; Friedrichs & Perry, 2001; Neumeier & Amos, 2006).”
Gorham, C., Barry, A., Lawrence, B. A., & Stevena, B. (2018) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.1101/405464
(2017) · Phytobiomes Journal · doi:10.1094/pbiomes-1-1
- Authors
- Elmer, W. H.
- Affiliations
- Connecticut Agricultural Experiment Station (US)
- Corresponding author
- Elmer, Wade H.
- ORCID
- Elmer, Wade H.
- Venue
- Phytopathology
- Publisher
- Scientific Societies
- Published
- 2014-10
- Volume
- 104
- Issue
- 10
- Pages
- 1070-1077
- ISSN
- 0031-949X (ISSN-L)
- 1943-7684
- OpenAlex
- W1986093365
- Cited by
- 19
- References
- 41
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 1 · 2022: 1 · 2020: 3 · 2018: 2 · 2017: 3 · 2016: 3 · 2015: 1
- FWCI
- 2.02
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Phytopathology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Ecology › Coastal wetland ecosystem dynamics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal plant biology
- Physical Sciences › Environmental Science › Ecology › Crustacean biology and ecology
- Keywords
- Spartina alterniflora, Sesarma reticulatum, herbivory, drought stress, plant disease, tripartite interactions, New England salt marshes
- MeSH terms
- Animals, Brachyura, Fusarium, Poaceae, New England, Plant Diseases, Plant Roots, Biomass, Wetlands, Host-Pathogen Interactions, Droughts
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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
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