Low forest-loss thresholds threaten Amazonian fish and macroinvertebrate assemblage integrity
| Autor: | Robert M. Hughes, Neusa Hamada, Felipe Rossetti de Paula, Leandro Juen, Janaina Gomes de Brito, Vívian Campos de Oliveira, Jorge Luiz Nessimian, Renato Tavares Martins, Karina Dias-Silva, Paulo Santos Pompeu, Cecília Gontijo Leal, Rafael P. Leitão, Silvio Frosini de Barros Ferraz, José Max Barbosa Oliveira-Junior, Fabio de Oliveira Roque |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Integrity River ecosystem Biome Biodiversity General Decision Sciences Small streams 010501 environmental sciences 010603 evolutionary biology 01 natural sciences Deforestation Ecology Evolution Behavior and Systematics QH540-549.5 PEIXES DE ÁGUA DOCE 0105 earth and related environmental sciences Riparian zone geography geography.geographical_feature_category Ecological thresholds Ecology Aquatic ecosystem Monitoring program Indicator taxa Environmental science Species richness Amazonian deforestation |
| Zdroj: | Ecological Indicators, Vol 127, Iss, Pp 107773-(2021) Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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