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Título:

Longitudinal changes on ecological diversity of Neotropical fish along a 1700 km river gradient show declines induced by dams

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Autor:

López Rodríguez, Anahí
Meerhoff, Mariana
D'Anatro, Alejandro
Ávila-Simas, S.
Silva, Ivana
Pais, Joaquín
Teixeira de Mello, Franco
Reynalte-Tataje, D.A.
Zaniboni-Filho, E.
González-Bergonzoni, Iván

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Artículo

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Palabras clave:

Longitudinal gradient
Habitat fragmentation
Fish diversity
Beta diversity
Isotopic niche
Trophic diversity

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Año de publicación:

2024

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Resumen:

In naturally flowing waters, communities are expected to increase their taxonomic and functional diversity as well as increase the complexity of food web architecture along the longitudinal gradient from headwaters to mouth. However, these theories do not necessarily apply to dammed rivers. We analysed fish communities at 12 locations along the 1700 km stretch of the transnational Uruguay River. We determined species richness, beta-diversity and its components (turnover and nestedness), trophic diversity, and isotopic niches at community level, with particular focus on areas upstream and downstream of the four existing dams. We estimated trophic diversity metrics based on diet analysis, and isotopic niche breadth based on Bayesian isotopic niche models. We detected consistent longitudinal changes, supporting predictions from the River Continuum Concept. However, taxonomic richness, trophic diversity, and isotopic niche decreased abruptly immediately downstream of dams, and the component contributing the most to beta diversity was turnover, with the highest values occurring mainly after the cascade of dams in the upper Uruguay River, fitting expectations from the Serial Discontinuity Concept. The dam-free stretches of the Uruguay River allowed the recovery of ecological diversity as fish richness and trophic and isotopic niche increased. The negative impacts of dams should urgently be considered in the Neotropics, where many large dams are projected.

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Material suplementario en: 10.1016/j.pecon.2024.03.003.

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Editorial:

Elsevier

EN:

Perspectives in Ecology and Conservation, 2024, 22(2): 186–195.

Financiadores:

ANII: FCE_2_2016_1_126780
CSIC: I+D 2016 577-348

Citación:

López Rodríguez, A, Meerhoff, M, D'Anatro, A [y otros autores]. "Longitudinal changes on ecological diversity of Neotropical fish along a 1700 km river gradient show declines induced by dams". Perspectives in Ecology and Conservation. [en línea] 2024, 22(2): 186–195. 10 h. DOI: 10.1016/j.pecon.2024.03.003

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2530-0644

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Licencia Creative Commons Atribución - No Comercial - Sin Derivadas (CC - By-NC-ND 4.0)

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Publicaciones académicas y científicas
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