The DOI matches its Crossref record; 25 of the 25 references it cites were found in a registry or an index; none of the 32 sources its claims cite is checked for support yet.
Home range of a Geoffroy's marmoset group, Callithrix geoffroyi (Primates, Callitrichidae) in South-eastern Brazil
Open accessAbstract
The home range of one group of the Geoffroy’s marmoset (Callithrix geoffroyi) was studied in a fragment of the Atlantic Forest in south-eastern Brazil, between February 1993 and January 1994. The total home range was 23.3 ha and the area used in the dry season was significantly larger than that of the wet season. The smallest distance travelled by group was 480 m/day in May and the longest was 1,980 m/day in March, but with no significant differences between seasons. The total home range used for this species agrees with the ecological grouping of the genus Callithrix proposed by Rylands & Faria (1993) and may be associated with the habitat structure, the limit of the fragment and the inexistence of neighbouring groups.
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TL;DR
The home range of one Geoffroy’s marmoset group in an Atlantic Forest fragment in south-eastern Brazil was 23.3 ha over a year, with significantly larger use in the dry season than the wet season. Daily travel distance varied widely but did not differ significantly between seasons.
Key findings
- The group used 259 squares, equivalent to a total home range of 23.3 ha, or about 21% of the 110-ha fragment.
- Home range was significantly larger in the dry season (7.2 ha) than in the wet season (4.9 ha); monthly area was largest in August (9.5 ha) and smallest in December (2.7 ha) and January (2.3 ha).
- Daily route length ranged from 480 m/day in May to 1,980 m/day in March; dry-season mean was 982.5 m/day and wet-season mean was 1,037.5 m/day, with no statistically significant difference.
- The group had exclusive use of its home range because other marmoset groups were absent from the fragment, and it concentrated activities near the fragment border where most gum sources were located.
Methods
- One group (one adult female, two adult males, two juveniles) was observed from February 1993 to January 1994 in a ~110-ha Atlantic Forest fragment at 19°48'S, 40°7'W in Espírito Santo, Brazil, after two months of habituation.
- Observations totaled 56 complete days and 464.1 hours; trails formed 30 x 30 m squares, and home range was determined by counting squares used, with scan sampling at 5-minute intervals.
- Monthly home range used only squares occupied that month; daily route was measured from complete observation days; seasonal differences were tested with Student t test at P < 0.05.
Limitations
- The paper states no explicit limitations section.
- Evident from the text: findings come from a single group in one isolated fragment, with no neighbouring groups, so the absence of intergroup contact and the fragment’s small limit may have influenced home range size.
- The cumulative square-use curve did not level off, suggesting the 12-month study may not have captured the full home range; the authors also note that home range estimates for Callithrix species come from different study durations.
Model-written summary. Check it against the paper before relying on it.
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Claims the paper makes
0 of 32 cited sources checked · 0 supported · 0 flagged
- Findingown data
The mean daily distance travelled by the study group did not differ significantly between the dry season (982.5 m/day) and the wet season (1037.5 m/day).
“but with no significant differences between seasons.”
- Also stated in: § RESULTS · plain
“During dry season the group travelled an average of 982.5 m/day and 1037.5 m/day during the rainy season; these differences were not statistically significant (Table 1).”
Quote in the paperNot a substantial claim - Also stated in: § RESULTS · plain
- Findingnone given
During movements, the study group used routes that coincided with routes used on previous days.
“During movements, the group made use of routes that coincided with the routes used in the previous days.”
Quote in the paperNot a substantial claim - Findingown data
The maximum daily distance travelled by the study group was 1,980 m/day in March.
“and the longest was 1,980 m/day in March”
- Also stated in: § RESULTS · plain
“The minimum and maximum distances travelled/day by the study group were 480 m (May) and 1,980 m (March), respectively.”
Quote in the paperNot a substantial claim - Also stated in: § RESULTS · plain
- Findingown data
The study group used its home range heterogeneously, with some squares more intensively used than others.
“The occupied area and its intensity of use demonstrate that the study group used the area in a heterogeneous way, with some squares being more intensively used than others (Fig. 2).”
Quote in the paperNot a substantial claim - Findingown data
The home range area used by the study group was significantly larger in the dry season (7.2 ha) than in the wet season (4.9 ha).
“the area used in the dry season was significantly larger than that of the wet season.”
- Also stated in: § RESULTS · plain
“The home range size was significantly larger in the dry season (7.2 ha) than in the wet season (4.9 ha) (Table 1).”
Quote in the paperNot a substantial claim - Also stated in: § RESULTS · plain
- Findingown data
The minimum daily distance travelled by the study group was 480 m/day in May.
“The smallest distance travelled by group was 480 m/day in May”
- Also stated in: § RESULTS · plain
“The minimum and maximum distances travelled/day by the study group were 480 m (May) and 1,980 m (March), respectively.”
Quote in the paperNot a substantial claim - Also stated in: § RESULTS · plain
- Premisecitation
The only available data on home range of C. geoffroyi before this study were from Rylands & Costa (1988) at Peti Station, Minas Gerais, who estimated 20-30 ha.
“The only available data about home range used by a group of C. geoffroyi were obtained by Rylands & Costa (1988) at the Peti Station, in Minas Gerais, south-eastern Brazil.These authors estimated the home range size of this species in at 20-30 ha, by dividing the size of stations area by the number of presumed groups present in there.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Rylands & Costa (1988)
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Interpretationreasoning
The differential utilisation of the group's home range showed a clear tendency to occupy places where food resources were more abundant (forest edges).
“The differential utilisation of the groups home range showed a clear tendency of occuping of places where the food resources were more abundant (forest edges).”
Quote in the paperSubstantial claim - Interpretationreasoning
It is expected that animals increase their probability of finding resources, and consequently their home range, if they do not spend time in agonistic intergroup encounters.
“Therefore, it is expected that the animals increase their probability of finding resources, and consequently, their home range, if they do not spend time in agonistic intergroup encounters.”
Quote in the paperSubstantial claim - Interpretationreasoning
The lack of overlap with neighbouring groups may have made possible an increase in the home range through a group strategy to invest more time and energy in searching for resources in different areas, instead of increasing foraging in each area.
“In the present study, the lack of overlap with neighbouring groups may have made possible an increase in the home range through a group strategy to invest more time and energy in the search for resources in different areas, instead of increasing the foraging in each area.”
Quote in the paperSubstantial claim- Rests on an assumption: The absence of other marmoset groups from the fragment reflects a true absence rather than incomplete detection.
- Premisecitation
Similar results were verified in C. aurita groups, where the more used regions coincided with overlapping area with neighbouring groups.
“Similar results were verified in C. aurita groups (Corrêa, 1995), where the more used regions coincided with overlapping area with neighbouring groups.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Corrêa, 1995
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Interpretationcitation
The study group may have increased its home range size as a result of reduced or lack of contact with neighbouring groups, given the low population density of C. geoffroyi in the studied fragment.
“As in the studied fragment, population density of C. geoffroyi is too low (Mendes et al., 1993), the study group may have increased its home range size as a result of reduced or lack of contact with neighbouring groups.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Mendes et al., 1993
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Rests on an assumption: The absence of other marmoset groups from the fragment reflects a true absence rather than incomplete detection.
- Interpretationcitation
The lack of seasonal difference in daily distance travelled is similar to results found for other Callithrix species.
“Related to the monthly mean distance range of the group, there were no significantly difference between the seasons, similar to the results found for other species of this genus (Rylands, 1982;Stevenson & Rylands, 1988;Ferrari, 1988;Corrêa, 1995).”
Quote in the paperNot a substantial claim0 of 3 sources checked- cites Rylands, 1982
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites Stevenson & Rylands, 1988
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites Ferrari, 1988
- Interpretationcitation
The more intensively used areas by the study group were directly related to the presence of the main food resources, mainly gum.
“The more intensively used areas by the study group were directly related to the presence of the main food resources, mainly gum (Passamani & Rylands, in press).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Passamani & Rylands, in press
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Study design and conductown data
The cumulative use of squares by the study group did not level off over the observation months.
“This figure also shows the cumulative use of squares, according to the observation months, where it can be observed that the curve obtained does not present leveling off.”
Quote in the paperNot a substantial claim - Interpretationcitation
During the other months, the study group covered a larger area because of the necessity of monitoring a large number of gum sources.
“On the other hand, during the other months the study group covered a larger area because of the necessity of monitoring a large number of gum sources (Passamani & Rylands, in press).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Passamani & Rylands, in press
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Interpretationcitation
The concentration of fruit plant species used in December and January, and the small number of gum trees used during this period, may have caused the individuals to restrict their home range in that period.
“The concentration of the fruit plant species used in December and January, and the small number of gum trees used during this period (Passamani & Rylands, in press), may have caused the individuals to restrict their home range in that period.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Passamani & Rylands, in press
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- It may state two separate claims as one. 13
- Probably not a substantial claim. 9
- The quote only partly states this claim. 1
It may state two separate claims as one.
Findingown dataThe monthly home range of the study group varied strongly, with the largest area in August (9.5 ha) and the smallest in December (2.7 ha) and January (2.3 ha).
“There was a strong variation in the home range used by the study group and the areas occupied each month were very small when compared to the total area.In August the study group used a larger area (9.5 ha), while in December and January it occupied smaller areas (2.7 ha and 2.3 ha respectively) (Fig. 1).”
Quote in the paperNot a substantial claimIt may state two separate claims as one.
FindingcitationWith the exception of the period of higher insect foraging (11:00-14:00), when the group moved randomly, movements related to fruit and gum use were similar to previous days, and the animals looked for routes that appeared to minimise distance and direction to food resources.
“With the exception of the period of higher foraging for insects which occurred between 11:00-14:00 hr (Passamani, 1998), when the study group moved randomly through the area, the movements related to fruit and um use were similar to the ones of the previous days, and the animals looked for routes that appeared to minimise the distance and direction of their food resources.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Passamani, 1998 source
It may state two separate claims as one.
Findingown dataThe total home range of the study group of Callithrix geoffroyi was 23.3 ha, equivalent to about 21% of the 110-ha forest fragment.
“The total home range was 23.3 ha”
- Also stated in: § RESULTS · plain
“The study group used a total of 259 squares during the year, which is equivalent to a home range of 23.3 ha, or about 21% of the fragments total area (Table 1).”
Quote in the paperNot a substantial claim- Rests on an assumption: The observed 23.3 ha is the total home range of the study group despite the cumulative area curve not leveling off.
- Also stated in: § RESULTS · plain
It may state two separate claims as one.
FindingreasoningThe study group had exclusive use of its home range because other marmoset groups were absent from the fragment.
“The study group had exclusive use of its home range, since other marmosets groups were absent in the fragment.”
Quote in the paperNot a substantial claim- Rests on an assumption: The absence of other marmoset groups from the fragment reflects a true absence rather than incomplete detection.
It may state two separate claims as one.
FindingcitationThe routes used by the study group were coincidentally related to the presence of fruit trees and principally gum sources.
“The routes used by the study group were coincidentally related to the presence of fruit trees and principally, to gum sources (Passamani, 1996).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Passamani, 1996
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
It may state two separate claims as one.
Findingown dataThe study group concentrated its activities near the fragment border, where the majority of gum sources were located.
“In general, the study group concentrated its activities near the fragments border, where the majority of gum sources were located.”
Quote in the paperNot a substantial claimProbably not a substantial claim. The paper’s conclusions may not depend on it.
PremisecitationAccording to Peres (1991), an alternative to minimise interference with resource prediction is to exclude competitors from the foraging area.
“According to Peres (1991), an alternative to minimise the degree of interference with the prediction of resources, is to exclude competitors from the foraging area.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Peres (1991)
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
InterpretationreasoningIt is possible that the group movements from area to area to monitor gum trees also avoid the depletion of food resources.
“It is ossible that the group movements from area to area to monitor gum trees, by doing so also avoid the depletion of food resources.”
Quote in the paperNot a substantial claimProbably not a substantial claim. It may state two separate claims as one.
PremisecitationAccording to Rylands & Faria (1993), C. geoffroyi should occupy home ranges larger than C. jacchus and C. penicillata and smaller than C. aurita and C. flaviceps.
“According to these authors, due to its ecological characteristics, C. geoffroyi should occupy home ranges larger than that of C. jacchus and C. penicillata, and smaller than of C. aurita and C. flaviceps.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Rylands & Faria (1993) source
Probably not a substantial claim. The paper’s conclusions may not depend on it.
PremisecitationGarber (1989) verified that during foraging for fruits and gum, Saguinus mystax and S. fuscicollis use an oriented movement pattern of the straight line type, which increases resource exploration efficiency.
“Garber (1989) verified that during foraging for fruits and gum, Saguinus mystax and S. fuscicollis use a oriented movement pattern of the type straight line, which increases the resources exploration efficiency.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Garber (1989) source
It may state two separate claims as one.
InterpretationreasoningThe home range size of the study group appears to be associated with habitat structure, the small limit of the fragment, and the lack of contact with neighbouring groups.
“In this group, it appears that the home range size is associated with habitat structure, to the fragments small limit and the lack of contact with neighbouring groups.”
Quote in the paperSubstantial claim- Rests on an assumption: The absence of other marmoset groups from the fragment reflects a true absence rather than incomplete detection.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
PremisecitationHigher population density of a species is associated with smaller home range size.
“According to Milton & May (1976) and Bergallo (1990), the higher the population density of a certain species, the smaller its home range size.”
Quote in the paperNot a substantial claim0 of 2 sources checked- cites Milton & May (1976) source
- cites Bergallo (1990)
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
It may state two separate claims as one.
InterpretationreasoningThe predominance of secondary vegetation with abundant lianas and gum trees in the entire fragment, and the absence of contact with neighbouring groups, may contribute to increasing the home range of this group.
“The predominance of secondary vegetation with an abundance of lianas and gum trees species in the entire fragment (see Meira-Neto, 1992), and the absence of contact with neighbouring groups, may contribute to increase the home range of this group.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Meira-Neto, 1992
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Rests on an assumption: The absence of other marmoset groups from the fragment reflects a true absence rather than incomplete detection.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
PremisecitationIn the genus Callithrix, home range size varies considerably according to the species and the habitat used.
“In the genus Callithrix, home range size varies considerably according to the species and the habitat used.”
Quote in the paperNot a substantial claim0 of 3 sources checked- cites Stevenson & Rylands, 1988
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites Ferrari, 1988
- cites Corrêa, 1995
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
PremisecitationSome authors have verified that in Callithrix, differences in habitat structure and floristic composition, availability and abundance of invertebrates and gum trees, and presence of neighbouring groups can directly influence home range size.
“Some authors have verified that, in this genus, the differences in structure and floristic composition of the habitat, the availability and abundance of invertebrates and gum trees, and the presence of neighbouring groups can directly influence the home range size of a group (Faria, 1984;Rylands, 1986;Ferrari, 1988;Scanlon et al., 1989;Corrêa, 1995).”
Quote in the paperNot a substantial claim0 of 3 sources checked- cites Faria, 1984
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites Rylands, 1986 source
- cites Ferrari, 1988
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
PremisecitationHome range size of an animal is influenced by body size, metabolic necessities, social structure, population density, and habitat productivity.
“In some species, the home range size can be influenced by body size, metabolic necessities, social structure and population density, and also, by habitat productivity (MacNab, 1963;Dawson, 1979;Harestad & Bunnell, 1979).”
Quote in the paperNot a substantial claim0 of 3 sources checkedIt may state two separate claims as one.
PremisecitationIn northern Espírito Santo, population densities estimated for C. geoffroyi varied from 0.7 groups/km2 (Putiri) to 7.5 groups/km2 (Reserva Florestal da CVRD) and were higher in larger fragments (ca. 20,000 ha) than in smaller fragments (ca. 200 ha).
“In northern of Espírito Santo, population densities estimated for C. geoffroyi varied from 0.7 groups/ km 2 (Putiri) to 7.5 groups/km 2 (Reserva Florestal da CVRD) and were higher in larger fragments (ca.20,000 ha) than in smaller fragments (ca.200 ha) (Chiarello, 1997).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Chiarello, 1997
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
It may state two separate claims as one.
PremisecitationThe callitrichid home range pattern can be directly related to interaction with neighbouring groups and patterns of resource availability.
“The callitrichids home range pattern can be directly related to the interaction with neighbouring groups and also, to patterns of resources availability (Dawson, 1979;Peres, 1991).”
Quote in the paperSubstantial claim0 of 2 sources checked- cites Dawson, 1979 source
- cites Peres, 1991
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
Probably not a substantial claim.
PremisecitationPeres (1991) verified that Leontopithecus rosalia groups use squares exclusive to themselves much less frequently than squares where there was overlap with neighbouring groups.
“This author also verified that Leontopithecus rosalia groups use the squares that are exclusive of themselves much less frequently than the ones where there was overlap with neighbouring groups.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Peres (1991)
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
It may state two separate claims as one. The quote only partly states this claim.
InterpretationcitationThe home range size of C. geoffroyi in this study (23.3 ha) is similar to the 20-30 ha estimate by Rylands & Costa (1988) and is in accordance with the ecological grouping of the genus Callithrix proposed by Rylands & Faria (1993).
“C. geoffroyis home range size in the present study (23.3 ha) is similar to the one estimated by those authors and is in accordance with the ecological grouping of the genus Callithix, proposed by Rylands & Faria (1993).”
Quote in the paperSubstantial claim0 of 2 sources checked- cites Rylands & Costa (1988)
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- cites Rylands & Faria (1993) source
- Rests on an assumption: The study group's home range is representative of the species Callithrix geoffroyi in the Atlantic Forest.
The paper relies on this without support.
The study group's home range is representative of the species Callithrix geoffroyi in the Atlantic Forest.
“The total home range used for this species agrees with the ecological grouping of the genus Callithrix proposed by Rylands & Faria (1993) and may be associated with the habitat structure, the limit of the fragment and the inexistence of neighbouring groups.”
“C. geoffroyis home range size in the present study (23.3 ha) is similar to the one estimated by those authors and is in accordance with the ecological grouping of the genus Callithix, proposed by Rylands & Faria (1993).”
The paper relies on this without support.
The absence of other marmoset groups from the fragment reflects a true absence rather than incomplete detection.
“The study group had exclusive use of its home range, since other marmosets groups were absent in the fragment.”
The paper relies on this without support.
The observed 23.3 ha is the total home range of the study group despite the cumulative area curve not leveling off.
“the curve obtained does not present leveling off.”
“The total home range was 23.3 ha”
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Ecology of Callithrix kuhlii and a Review of Eastern Brazilian Marmosets
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Metadata
- Authors
- PASSAMANI, M., & RYLANDS, A. B.
- Affiliations
- Universidade Federal de Minas Gerais (BR)
- Corresponding author
- PASSAMANI, M.
- Venue
- Revista Brasileira de Biologia
- Publisher
- FapUNIFESP (SciELO)
- Published
- 2000-05
- Volume
- 60
- Issue
- 2
- Pages
- 275-281
- ISSN
- 0034-7108 (ISSN-L)
- OpenAlex
- W2078884666
- Cited by
- 24
- References
- 23
- Citations by year
- 2026: 1 · 2025: 2 · 2022: 2 · 2021: 2 · 2020: 1 · 2018: 2 · 2015: 1 · 2013: 3
- FWCI
- 0.80
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Licence
- cc-by-nc
- Locations
- Revista Brasileira de Biologia (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (publishedVersion, other-oa)
- Americanae (AECID Library) (submittedVersion, other-oa)
- Funders
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- U.S. Fish and Wildlife Service
- Topics
- Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Primate Behavior and Ecology
- Physical Sciences › Environmental Science › Ecology › Wildlife Ecology and Conservation
- Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Animal Behavior and Reproduction
- Keywords
- Geoffroy's marmoset, Callithrix geoffroyi, home range, home range size, seasonal variation, Atlantic Forest, habitat fragmentation, primate movement
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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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