Low forest-loss thresholds threaten Amazonian fish and macroinvertebrate assemblage integrity

Deforestation is a major threat globally, but especially in tropical regions because they are biodiversity strongholds and carbon storehouses. Some studies have reported changes in species richness and composition in lotic ecosystems with increased forest-loss in their catchment, presumably resultin...

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Autores principales:	Renato T. Martins, Janaina Brito, Karina Dias-Silva, Cecília G. Leal, Rafael P. Leitão, Vivian C. Oliveira, José M.B. Oliveira-Júnior, Silvio F.B. Ferraz, Felipe R. de Paula, Fábio O. Roque, Neusa Hamada, Leandro Juen, Jorge L. Nessimian, Paulo S. Pompeu, Robert M. Hughes
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Ecological thresholds Amazonian deforestation Small streams Indicator taxa Integrity Biodiversity Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/237942baf8af4a41b5291e8539cb86e8
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spelling	oai:doaj.org-article:237942baf8af4a41b5291e8539cb86e82021-12-01T04:53:20ZLow forest-loss thresholds threaten Amazonian fish and macroinvertebrate assemblage integrity1470-160X10.1016/j.ecolind.2021.107773https://doaj.org/article/237942baf8af4a41b5291e8539cb86e82021-08-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21004386https://doaj.org/toc/1470-160XDeforestation is a major threat globally, but especially in tropical regions because they are biodiversity strongholds and carbon storehouses. Some studies have reported changes in species richness and composition in lotic ecosystems with increased forest-loss in their catchment, presumably resulting from the replacement of sensitive taxa by more resistant or tolerant taxa. Also, sensitive taxa respond to deforestation in a non-linear manner and fish and macroinvertebrates have different sensitivities to landscape pressures. Therefore, it is useful to determine the effects of forest-loss on widespread sensitive or threshold taxa in aquatic ecosystems. We used Threshold Indicator Taxa Analysis (TITAN) to assess forest-loss and land use history impacts in 92 eastern Amazonian stream sites. We determined TITAN peak-change thresholds for fish at 1% and 6% of forest-loss at total-catchment and local-riparian spatial extents, respectively, and at 2% and 40% of land-use intensity change at total-catchment and local-riparian spatial extents, respectively. For macroinvertebrates, TITAN peak-change thresholds were 1% and 11% of forest loss at total-catchment and local-riparian spatial extents, respectively, and at 3% of land-use intensity change for both total-catchment and local-riparian spatial extents. Because of these thresholds, inherent ecoregional variability and key literature, we have three major recommendations. 1) Logging should be prohibited in riparian reserves that are at least 100-m wide on each side of headwater streams and in a network of catchments across all biomes and as many landscape types as possible. 2) An ecologically and statistically rigorous monitoring program with standard methods should be implemented to assess and regulate land uses better. 3) Conservation planning areas should consider aquatic biota as well as terrestrial biota.Renato T. MartinsJanaina BritoKarina Dias-SilvaCecília G. LealRafael P. LeitãoVivian C. OliveiraJosé M.B. Oliveira-JúniorSilvio F.B. FerrazFelipe R. de PaulaFábio O. RoqueNeusa HamadaLeandro JuenJorge L. NessimianPaulo S. PompeuRobert M. HughesElsevierarticleEcological thresholdsAmazonian deforestationSmall streamsIndicator taxaIntegrityBiodiversityEcologyQH540-549.5ENEcological Indicators, Vol 127, Iss , Pp 107773- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Ecological thresholds Amazonian deforestation Small streams Indicator taxa Integrity Biodiversity Ecology QH540-549.5
spellingShingle	Ecological thresholds Amazonian deforestation Small streams Indicator taxa Integrity Biodiversity Ecology QH540-549.5 Renato T. Martins Janaina Brito Karina Dias-Silva Cecília G. Leal Rafael P. Leitão Vivian C. Oliveira José M.B. Oliveira-Júnior Silvio F.B. Ferraz Felipe R. de Paula Fábio O. Roque Neusa Hamada Leandro Juen Jorge L. Nessimian Paulo S. Pompeu Robert M. Hughes Low forest-loss thresholds threaten Amazonian fish and macroinvertebrate assemblage integrity
description	Deforestation is a major threat globally, but especially in tropical regions because they are biodiversity strongholds and carbon storehouses. Some studies have reported changes in species richness and composition in lotic ecosystems with increased forest-loss in their catchment, presumably resulting from the replacement of sensitive taxa by more resistant or tolerant taxa. Also, sensitive taxa respond to deforestation in a non-linear manner and fish and macroinvertebrates have different sensitivities to landscape pressures. Therefore, it is useful to determine the effects of forest-loss on widespread sensitive or threshold taxa in aquatic ecosystems. We used Threshold Indicator Taxa Analysis (TITAN) to assess forest-loss and land use history impacts in 92 eastern Amazonian stream sites. We determined TITAN peak-change thresholds for fish at 1% and 6% of forest-loss at total-catchment and local-riparian spatial extents, respectively, and at 2% and 40% of land-use intensity change at total-catchment and local-riparian spatial extents, respectively. For macroinvertebrates, TITAN peak-change thresholds were 1% and 11% of forest loss at total-catchment and local-riparian spatial extents, respectively, and at 3% of land-use intensity change for both total-catchment and local-riparian spatial extents. Because of these thresholds, inherent ecoregional variability and key literature, we have three major recommendations. 1) Logging should be prohibited in riparian reserves that are at least 100-m wide on each side of headwater streams and in a network of catchments across all biomes and as many landscape types as possible. 2) An ecologically and statistically rigorous monitoring program with standard methods should be implemented to assess and regulate land uses better. 3) Conservation planning areas should consider aquatic biota as well as terrestrial biota.
format	article
author	Renato T. Martins Janaina Brito Karina Dias-Silva Cecília G. Leal Rafael P. Leitão Vivian C. Oliveira José M.B. Oliveira-Júnior Silvio F.B. Ferraz Felipe R. de Paula Fábio O. Roque Neusa Hamada Leandro Juen Jorge L. Nessimian Paulo S. Pompeu Robert M. Hughes
author_facet	Renato T. Martins Janaina Brito Karina Dias-Silva Cecília G. Leal Rafael P. Leitão Vivian C. Oliveira José M.B. Oliveira-Júnior Silvio F.B. Ferraz Felipe R. de Paula Fábio O. Roque Neusa Hamada Leandro Juen Jorge L. Nessimian Paulo S. Pompeu Robert M. Hughes
author_sort	Renato T. Martins
title	Low forest-loss thresholds threaten Amazonian fish and macroinvertebrate assemblage integrity
title_short	Low forest-loss thresholds threaten Amazonian fish and macroinvertebrate assemblage integrity
title_full	Low forest-loss thresholds threaten Amazonian fish and macroinvertebrate assemblage integrity
title_fullStr	Low forest-loss thresholds threaten Amazonian fish and macroinvertebrate assemblage integrity
title_full_unstemmed	Low forest-loss thresholds threaten Amazonian fish and macroinvertebrate assemblage integrity
title_sort	low forest-loss thresholds threaten amazonian fish and macroinvertebrate assemblage integrity
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/237942baf8af4a41b5291e8539cb86e8
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Low forest-loss thresholds threaten Amazonian fish and macroinvertebrate assemblage integrity

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