Floodplain land cover affects biomass distribution of fish functional diversity in the Amazon River
Open accessAbstract
Land-cover change often shifts the distribution of biomass in animal communities. However, the effects of land-cover changes on functional diversity remain poorly understood for many organisms and ecosystems, particularly, for floodplains. We hypothesize that the biomass distribution of fish functional diversity in floodplains is associated with land cover, which would imply that fish traits affect behavioral and/or demographic responses to gradients of land cover. Using data from surveys of 462 habitats covering a range of land-cover conditions in the Amazon River floodplain, we fitted statistical models to explain landscape-scale variation in functional diversity and biomass of all fish species as well as subsets of species possessing different functional traits. Forest cover was positively associated with fish biomass and the strength of this relationship varied according to functional groups defined by life history, trophic, migration, and swimming-performance/microhabitat-use traits. Forty-two percent of the functional groups, including those inferred to have enhanced feeding opportunities, growth, and/or reproductive success within forested habitats, had greater biomass where forest cover was greater. Conversely, the biomass of other functional groups, including habitat generalists and those that directly exploit autochthonous food resources, did not vary significantly in relation to forest cover. The niche space occupied by local assemblages (functional richness) and dispersion in trait abundances (functional dispersion) tended to increase with forest cover. Our study supports the expectation that deforestation in the Amazon River floodplain affects not only fish biomass but also functional diversity, with some functional groups being particularly vulnerable.
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Observed species-specific and community-wide thresholds in relation to forest cover were consistent with the view that floodplain forest cover influences the structure of fish assemblages through environmental filtering in the Amazon.
“Overall, observed species‐specific and community‐wide thresholds in relation to forest cover were consistent with the view that floodplain forest cover influences the structure of fish assemblages through environmental filtering in the Amazon (Arantes, Winemiller, Asher, et al., 2019; Freitas et al., 2018; Montag et al., 2019).”
From Threshold responses of floating meadow fish communities to floodplain forest cover in the lower Amazon River (2025) · cites this paper as Arantes, Winemiller, Asher, et al., 2019
The Discussion says that differing responses of fish functional groups to forest cover are consistent with trait-mediated environmental filtering, and that forest loss may filter out certain species and traits. The Results report associations between forest cover and total fish biomass and several functional groups, but our copy does not report species-specific or community-wide thresholds in forest cover; its Methods describe models using linear predictors. No page numbers are available in our copy. (LLM, conf=0.88)
Experimental — accuracy not yet measuredPrior research shows that low forest cover in the Amazon floodplain is generally associated with low abundance of large migratory, periodic strategist fishes.
“In contrast, prior research shows that low forest cover in the Amazon floodplain is generally associated with low abundance of large migratory, periodic strategist fishes (Arantes et al., 2018; Arantes, Winemiller, Asher, et al., 2019; Castello et al., 2017; Freitas et al., 2018; Pereira et al., 2023).”
From Threshold responses of floating meadow fish communities to floodplain forest cover in the lower Amazon River (2025) · cites this paper as Arantes, Winemiller, Asher, et al., 2019
The Results report significantly greater biomass of regional migrators where forest cover was higher. They also report a positive trend for periodic strategists that mature at large size, but it was not statistically significant (p > 0.09). The paper measures biomass rather than abundance, so it does not establish the claimed general association for large migratory, periodic-strategist fishes. (LLM, conf=0.89)
Experimental — accuracy not yet measuredThis pattern was observed among several cichlid species, likely owing to their equilibrium life-history strategies that involve nesting and brood guarding near submerged structures.
“This pattern was observed among several cichlid species, likely owing to their equilibrium life‐history strategies that involve nesting and brood guarding near submerged structures (Arantes, Winemiller, Asher, et al., 2019; Carvalho De Lima & Araujo‐Lima, 2004).”
From Threshold responses of floating meadow fish communities to floodplain forest cover in the lower Amazon River (2025) · cites this paper as Arantes, Winemiller, Asher, et al., 2019
The Discussion (page unavailable) describes cichlids as equilibrium strategists with bi-parental brood guarding and suggests that structurally complex flooded forests may improve offspring survival. It does not say that they nest near submerged structures or report the pattern for several individual cichlid species; the Results report associations for functional groups instead. (LLM, conf=0.84)
Experimental — accuracy not yet measuredThe prevalence of juveniles of periodic and migratory groups in low forest cover areas contrasts with earlier studies showing their adult stages were positively linked to forest cover in the lower Amazon.
“The prevalence of juveniles of these groups in low forest cover areas contrasts with earlier studies showing their adult stages were positively linked to forest cover in the lower Amazon (Arantes, Winemiller, Asher, et al., 2019).”
From Threshold responses of floating meadow fish communities to floodplain forest cover in the lower Amazon River (2025) · cites this paper as Arantes, Winemiller, Asher, et al., 2019
The Results (page not provided) report that regional migrators had greater biomass where forest cover was higher in the lower Amazon, while periodic strategists showed only a non-significant positive trend. The paper does not establish that these relationships specifically concern adult stages; the cited finding is about biomass of functional groups, not an adult–juvenile comparison. (LLM, conf=0.86)
Experimental — accuracy not yet measuredForest cover is positively associated with fish biomass and fisheries yield in the Amazon River floodplain.
“Forest cover is positively associated with fish biomass and fisheries yield in the Amazon River floodplain”
From Threshold responses of floating meadow fish communities to floodplain forest cover in the lower Amazon River (2025) · cites this paper as Arantes, Winemiller, Asher, et al., 2019
Fishes respond differently to a gradient of forest loss in the Amazon River floodplain, with the magnitude and direction of response depending on functional traits.
“However, fishes respond differently to a gradient of forest loss in the Amazon River floodplain, with the magnitude and direction of response depending on functional traits (Arantes et al., 2018; Arantes, Winemiller, Asher, et al., 2019).”
From Threshold responses of floating meadow fish communities to floodplain forest cover in the lower Amazon River (2025) · cites this paper as Arantes, Winemiller, Asher, et al., 2019
Indicator species displayed functional and taxonomic group response patterns, consistent with prior studies showing divergent fish responses to forest cover gradients in Amazonian rivers, floodplains, and streams.
“Indicator species displayed functional and taxonomic group response patterns, consistent with prior studies showing divergent fish responses to forest cover gradients in Amazonian rivers, floodplains, and streams (Arantes, Winemiller, Asher, et al., 2019; Brejão et al., 2017; Ilha et al., 2019; Lugo‐Carvajal et al., 2023).”
From Threshold responses of floating meadow fish communities to floodplain forest cover in the lower Amazon River (2025) · cites this paper as Arantes, Winemiller, Asher, et al., 2019
In the lower Amazon floodplain, fish assemblages in floating meadows (this study) and aquatic habitats generally are significantly associated with forest cover.
“In the lower Amazon floodplain, fish assemblages in floating meadows (this study) and aquatic habitats generally (Arantes et al., 2018; Arantes, Winemiller, Asher, et al., 2019) are significantly associated with forest cover, making consideration of this relationship essential for conservation planning (Michanek et al. et al., 2018; Putz et al., 2001).”
From Threshold responses of floating meadow fish communities to floodplain forest cover in the lower Amazon River (2025) · cites this paper as Arantes, Winemiller, Asher, et al., 2019
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Cites
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Cited by
Sorted by citations
Grinstead, S., Arantes, C. C., Winemiller, K. O., Kelso‐Winemiller, L. C., de Oliveira, J. A., Petrere, M., & Freitas, C. E. C. (2025) · Conservation Biology · doi:10.1111/cobi.70110
Self-citation
- Authors
- Arantes, C. C., Winemiller, K. O., Asher, A., Castello, L., Hess, L. L., Petrere, M., & Freitas, C. E. C.
- Affiliations
- Michigan State University (US)
- Texas A&M University (US)
- Virginia Tech (US)
- University of California, Santa Barbara (US)
- Universidade Católica de Santos (BR)
- Corresponding author
- Arantes, Caroline C.
- Venue
- Scientific Reports
- Published
- 2019-11-13
- Volume
- 9
- Issue
- 1
- Pages
- 16684-16684
- ISSN
- 2045-2322 (ISSN-L)
- PMC
- PMC6853970
- OpenAlex
- W2982918730
- Cited by
- 85
- References
- 4
- Citations by year
- 2026: 9 · 2025: 14 · 2024: 16 · 2023: 10 · 2022: 15 · 2021: 16 · 2020: 5
- FWCI
- 6.25
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Scientific Reports (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- VTechWorks (Virginia Tech) (submittedVersion, cc-by)
- Funders
- National Science Foundation (1257813, 1639115)
- National Aeronautics and Space Administration (NNX12AD27G, NNX14AD29G)
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (200893/2012‐2, 563073/2010)
- Instituto de Desenvolvimento Sustentável Mamirauá
- Topics
- Physical Sciences › Environmental Science › Nature and Landscape Conservation › Fish biology, ecology, and behavior
- Physical Sciences › Environmental Science › Nature and Landscape Conservation › Fish Ecology and Management Studies
- Physical Sciences › Environmental Science › Nature and Landscape Conservation › Ecology and Vegetation Dynamics Studies
- Keywords
- floodplain fish, land cover, forest cover, fish biomass, Amazon River floodplain, deforestation, functional traits, functional richness, functional dispersion, life-history traits, trophic traits, swimming performance, microhabitat use, habitat generalists
- MeSH terms
- Animals, Environmental Monitoring, Fishes, Ecosystem, Biomass, Biodiversity, Rivers, Floods
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