In the face of multiple,co-varying environmental threats,measuring anthropogenic impacts and species responses to them is essential for developing biomonitoring programs and for biodiversity conservation.One way of in...In the face of multiple,co-varying environmental threats,measuring anthropogenic impacts and species responses to them is essential for developing biomonitoring programs and for biodiversity conservation.One way of investigating species responses to different conditions is through indicator species indexes.In this context,we investigated zooplankton species indicators of system type(stream or pond),and the most responsive zooplankton indicators of land use changes(pasture and forest)and water quality(oxygen,pH,temperature,and conductivity)within each system type.We studied 221 sites(162 streams and 59 ponds)across one region of Acre state and seven regions of Parástate,Brazil.We sampled zooplankton and physical and chemical variables at each site and determined land use through digital image processing.We recorded 190 taxa(112 Rotifera,57 Cladocera,and 21 Copepoda).Thirteen species were pond indicators but none were stream indicators.Several species were indicators of land use and water quality in streams;for example,Disparalona tenuispina indicated highly forested streams and Alonella clathratula and Nicsmirnovius pagii indicated high pasture levels.In ponds,Ephemeroporus barroisi and Lecane doryssa indicated moderate pasture levels and no species indicated forested ponds.Temperature,pH,conductivity,and oxygen were the main drivers of species richness.Our results demonstrate that species-specific responses,rather than assemblage-level patterns,offer insights into the ecological status of these aquatic systems.Furthermore,landscape variables,such as forest and pasture cover,influence the selection of specific zooplankton species in streams but not in ponds.However,forested ponds had the highest species richness.Finally,we highlight the role of certain zooplankton species as sensitive bioindicators of ecosystem health.展开更多
基金supported by Fundação de AmparoàPesquisa do Estado do Pará[FAPESPA-grant number 2022/1437669]the projects“Closing Linnaean and Wallacean Shortfalls in Aquatic Biota in the Amazon”,“Programa de Pesquisa da Biodiversidade da Amazônia Oriental”,and INCT-SinBiAm[Conselho Nacional de Desenvolvimento Científico e Tecnológico-CNPq-processes 428961/2018-5,441257/2023-2 and 406767/2022-0,respectively]+2 种基金“Patterns of aquatic biodiversity distribution in the state of Pará”[FAPESPA and FAPESP-grant numbers 068/2020 and 2019/25445-1)“Avaliação da biodiversidade aquática de riachos do arquipélago do Marajó”[FAPESPA-grant number ICCAF:049/2021]TSM and LJ received productivity scholarships by Conselho Nacional de Desenvolvimento Científico e Tecnológico(processes:311835/2023-6,304710/2019-9,respectively).
文摘In the face of multiple,co-varying environmental threats,measuring anthropogenic impacts and species responses to them is essential for developing biomonitoring programs and for biodiversity conservation.One way of investigating species responses to different conditions is through indicator species indexes.In this context,we investigated zooplankton species indicators of system type(stream or pond),and the most responsive zooplankton indicators of land use changes(pasture and forest)and water quality(oxygen,pH,temperature,and conductivity)within each system type.We studied 221 sites(162 streams and 59 ponds)across one region of Acre state and seven regions of Parástate,Brazil.We sampled zooplankton and physical and chemical variables at each site and determined land use through digital image processing.We recorded 190 taxa(112 Rotifera,57 Cladocera,and 21 Copepoda).Thirteen species were pond indicators but none were stream indicators.Several species were indicators of land use and water quality in streams;for example,Disparalona tenuispina indicated highly forested streams and Alonella clathratula and Nicsmirnovius pagii indicated high pasture levels.In ponds,Ephemeroporus barroisi and Lecane doryssa indicated moderate pasture levels and no species indicated forested ponds.Temperature,pH,conductivity,and oxygen were the main drivers of species richness.Our results demonstrate that species-specific responses,rather than assemblage-level patterns,offer insights into the ecological status of these aquatic systems.Furthermore,landscape variables,such as forest and pasture cover,influence the selection of specific zooplankton species in streams but not in ponds.However,forested ponds had the highest species richness.Finally,we highlight the role of certain zooplankton species as sensitive bioindicators of ecosystem health.
