4.6 Article

Functional erosion and trait loss in fish assemblages from Neotropical reservoirs: The man beyond the environment

期刊

FISH AND FISHERIES
卷 22, 期 2, 页码 377-390

出版社

WILEY
DOI: 10.1111/faf.12524

关键词

biodiversity; dams; functional dispersion; functional richness; human footprint index; ichthyofauna

资金

  1. CoordenacAo de Aperfeicoamento Pessoal de Nivel Superior (CAPES-PROEX)
  2. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [150768/2019-2]
  3. AAA

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This study evaluated the influence of human pressure on the functional diversity of fish assemblages in Neotropical reservoirs, finding a negative impact on functional diversity with increasing human pressure, especially in reservoirs near large cities. Additionally, there was a positive relationship between reservoir area and functional diversity, and a negative relationship between reservoir age and functional diversity.
Anthropogenic impacts are altering ecosystems, especially aquatic habitats, resulting in the loss of critical biodiversity. This study aimed to evaluate the influence of human pressure, as surrogated by the human footprint index (HFI), on the functional diversity of fish assemblages from 109 Neotropical reservoirs while considering covariates such as temperature, flooded area and age since damming. We assessed two components of functional diversity (richness and dispersion) and the specific trait composition of each fish assemblage. We found that both components of fish functional diversity decreased with increasing human pressure and that this relationship was stronger in reservoirs near large cities. There was a positive relationship between functional diversity and reservoir area, and a negative relationship between functional diversity and reservoir age. We also observed strong relationships between all the explanatory variables and functional traits, particularly for the HFI. We can infer that the ichthyofaunas of those reservoirs under higher human pressure are likely undergoing a simplification process along with homogenization of functional diversity.

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