2026-04-13T07:07:48Zhttps://recercat.cat/oai/request
oai:recercat.cat:10256/204892024-06-18T11:08:21Zcom_2072_452955com_2072_2054col_2072_452959col_2072_453080
RECERCAT author Dos Santos, Joyce Andreia author Barbosa Silva, Camila author Soares de Santana, Herick author Cano-Barbacil, Carlos author Agostinho, Angelo Antonio author Normando, Felipe Talin author Cabeza, João Rodrigo author Roland, Fabio author García-Berthou, Emili 2024-06-18T11:08:21Z 2024-06-18T11:08:21Z 2022-04-01 http://hdl.handle.net/10256/20489 The enormous biodiversity of tropical freshwater combined with a considerable increase in the construction of reservoirs urges to understand the ecological effects caused by damming. Using rarely available data obtained before (one year) and after (four years) the filling of a hydroelectric plant on the Teles Pires River (Amazon River basin), the effects on abundance, biomass, and diversity of the fish assemblage were evaluated using two complementary approaches: a BACI (before-after-control-impact) design with mixed models and analyses of covariance. Significant Before-After × Control-Impact interactions in abundance, biomass, and species richness were observed, with decreases of abundance and species richness and more stable biomass after filling. Some abundant species, such as Jupiaba polylepis, Jupiaba acanthogaster, Knodus cf. heteresthes, and Moenkhausia lepidura among others, declined in abundance or disappeared from the impact sites. However, temporal and particularly spatial variation independent of damming explained more variation in all the response variables analyzed, including species composition, and analyses of covariance demonstrated general negative trends irrespective of damming. This study illustrates the usefulness of BACI designs to assess the effects of damming but also that other statistical approaches are complementary, given the difficulty of identifying control sites and the short length of most ecological time series. The results also suggest that preserving tributaries upstream of reservoirs and natural regimes of spatial and temporal environmental variation might help to mitigate the impacts of damming in tropical ecosystemsFinancial support was provided by the Spanish Ministry of Science (projects RED 2018-102571-T, and PID 2019-103936 GB-C21) and the Government of Catalonia (ref. 2017 SGR 548)Open Access funding provided thanks to the CRUE-CSIC agreement with Elsevier Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Ecologia dels pantans -- Brasil -- Teles Pires (curs d'aigua) Écologie des réservoirs -- Brazil -- Teles Pires (river) Peixos d'aigua dolça -- Brasil -- Teles Pires (curs d'aigua) Freshwater fishes -- Brazil -- Teles Pires (river) Assessing the short-term response of fish assemblages to damming of an Amazonian river info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion peer-reviewed