Data/hora: 06/06/2024 14:00:10

Provedor de dados: | 83
País: | Brazil
Título: | Influence of environmental variables on stream fish fauna at multiple spatial scales
Autores: | Junqueira,Nara Tadini; Macedo,Diego Rodrigues; Souza,Rafael Couto Rosa de; Hughes,Robert Mason; Callisto,Marcos; Pompeu,Paulo Santos.
Data: | 2016-01-01
Ano: | 2016
Palavras-chave: | Disturbed sites; Fish assemblages; Land use; Partial CCA; Physical habitat.
Resumo: | ABSTRACT Effects of environmental variables at different spatial scales on freshwater fish assemblages are relatively unexplored in Neotropical ecosystems. However, those influences are important for developing management strategies to conserve fish diversity and water resources. We evaluated the influences of site- (in-stream) and catchment-scale (land use and cover) environmental variables on the abundance and occurrence of fish species in streams of the Upper Araguari River basin through use of variance partitioning with partial CCA. We sampled 38 1st to 3rd order stream sites in September 2009. We quantified site variables to calculate 11 physical habitat metrics and mapped catchment land use/cover. Site and catchment variables explained &gt; 50% of the total variation in fish species. Site variables (fish abundance: 25.31%; occurrence: 24.51%) explained slightly more variation in fish species than catchment land use/cover (abundance: 22.69%; occurrence: 18.90%), indicating that factors at both scales are important. Because anthropogenic pressures at site and catchment scales both affect stream fish in the Upper Araguari River basin, both must be considered jointly to apply conservation strategies in an efficient manner.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000300202
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/1982-0224-20150116
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.14 n.3 2016
Fonte: | info:eu-repo/semantics/openAccess