Impacts of an Amazonian hydroelectric dam on frog assemblages.

About 90% of the Amazon's energy potential remains unexploited, with many large hydroelectric dams yet to be built, so it is important to understand how terrestrial vertebrates are affected by reservoir formation and habitat loss. We investigated the influence of the construction of the Santo A...

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Autores principales:	Jussara Santos Dayrell, William Ernest Magnusson, Paulo Estefano Dineli Bobrowiec, Albertina Pimentel Lima
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/22373978b30743ad982669a86e1d050a
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spelling	oai:doaj.org-article:22373978b30743ad982669a86e1d050a2021-11-25T06:23:32ZImpacts of an Amazonian hydroelectric dam on frog assemblages.1932-620310.1371/journal.pone.0244580https://doaj.org/article/22373978b30743ad982669a86e1d050a2021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0244580https://doaj.org/toc/1932-6203About 90% of the Amazon's energy potential remains unexploited, with many large hydroelectric dams yet to be built, so it is important to understand how terrestrial vertebrates are affected by reservoir formation and habitat loss. We investigated the influence of the construction of the Santo Antônio Hydroelectric dam on the Madeira River in southwestern Amazonia on the structure of frog assemblages based on samples collected in two years before the dam flooded (pre-stage) and one (post1-stage) and four years (post2-stage) after its construction. We surveyed five 500-ha plot systems three times during each stage; in the pre-stage we sampled 19 plots in low-lying areas that would be flooded by the dam, (from now called flooded pre-stage plots) and 45 plots in terra-firme forest (from now called unflooded pre-stage plots). At the post1-stage we sampled the 45 unflooded plots and in the post2-stage we sampled the remaining 39 unflooded plots. We detected frogs by active visual and acoustic searches standardized by both time and sampling area. Few species recorded in the pre-stage flooded plots were not found in the pre-stage unflooded plots or in stages after flooding. However, the composition of frog assemblages based on relative densities in flooded pre-stage plots did not re-establish in plots on the new river margins. In unflooded areas, frog assemblages were distinct among the flooding stages with no tendency to return to the original assemblage compositions even four years after the dam was filled. For the areas that were not flooded, there was an increase in species richness in 82% of the plots between the surveys before dam construction and the first surveys after dam completion, and 65% between the pre-stage and surveys four years after dam completion. Lack of understanding by the controlling authorities of the long-term effects of landscape changes, such as water-table rises, means that studies covering appropriate periods post construction are not required in legislation, but the data from Santo Antônio indicate that changes due to dam construction are either long-term or difficult to distinguish from natural fluctuations. Future environmental-impact studies should follow strict BACI designs.Jussara Santos DayrellWilliam Ernest MagnussonPaulo Estefano Dineli BobrowiecAlbertina Pimentel LimaPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 6, p e0244580 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jussara Santos Dayrell William Ernest Magnusson Paulo Estefano Dineli Bobrowiec Albertina Pimentel Lima Impacts of an Amazonian hydroelectric dam on frog assemblages.
description	About 90% of the Amazon's energy potential remains unexploited, with many large hydroelectric dams yet to be built, so it is important to understand how terrestrial vertebrates are affected by reservoir formation and habitat loss. We investigated the influence of the construction of the Santo Antônio Hydroelectric dam on the Madeira River in southwestern Amazonia on the structure of frog assemblages based on samples collected in two years before the dam flooded (pre-stage) and one (post1-stage) and four years (post2-stage) after its construction. We surveyed five 500-ha plot systems three times during each stage; in the pre-stage we sampled 19 plots in low-lying areas that would be flooded by the dam, (from now called flooded pre-stage plots) and 45 plots in terra-firme forest (from now called unflooded pre-stage plots). At the post1-stage we sampled the 45 unflooded plots and in the post2-stage we sampled the remaining 39 unflooded plots. We detected frogs by active visual and acoustic searches standardized by both time and sampling area. Few species recorded in the pre-stage flooded plots were not found in the pre-stage unflooded plots or in stages after flooding. However, the composition of frog assemblages based on relative densities in flooded pre-stage plots did not re-establish in plots on the new river margins. In unflooded areas, frog assemblages were distinct among the flooding stages with no tendency to return to the original assemblage compositions even four years after the dam was filled. For the areas that were not flooded, there was an increase in species richness in 82% of the plots between the surveys before dam construction and the first surveys after dam completion, and 65% between the pre-stage and surveys four years after dam completion. Lack of understanding by the controlling authorities of the long-term effects of landscape changes, such as water-table rises, means that studies covering appropriate periods post construction are not required in legislation, but the data from Santo Antônio indicate that changes due to dam construction are either long-term or difficult to distinguish from natural fluctuations. Future environmental-impact studies should follow strict BACI designs.
format	article
author	Jussara Santos Dayrell William Ernest Magnusson Paulo Estefano Dineli Bobrowiec Albertina Pimentel Lima
author_facet	Jussara Santos Dayrell William Ernest Magnusson Paulo Estefano Dineli Bobrowiec Albertina Pimentel Lima
author_sort	Jussara Santos Dayrell
title	Impacts of an Amazonian hydroelectric dam on frog assemblages.
title_short	Impacts of an Amazonian hydroelectric dam on frog assemblages.
title_full	Impacts of an Amazonian hydroelectric dam on frog assemblages.
title_fullStr	Impacts of an Amazonian hydroelectric dam on frog assemblages.
title_full_unstemmed	Impacts of an Amazonian hydroelectric dam on frog assemblages.
title_sort	impacts of an amazonian hydroelectric dam on frog assemblages.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/22373978b30743ad982669a86e1d050a
work_keys_str_mv	AT jussarasantosdayrell impactsofanamazonianhydroelectricdamonfrogassemblages AT williamernestmagnusson impactsofanamazonianhydroelectricdamonfrogassemblages AT pauloestefanodinelibobrowiec impactsofanamazonianhydroelectricdamonfrogassemblages AT albertinapimentellima impactsofanamazonianhydroelectricdamonfrogassemblages
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Impacts of an Amazonian hydroelectric dam on frog assemblages.

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