Abstract
This study investigated the environmental factors influencing the distribution of the endangered arapaima (Arapaima spp.) in floodplains of the Amazon. The abundance of arapaima was found to be positively related to the area and depth of the water column, and hence volume of lakes. Greater depth of water column also was related positively with the abundance and presence of arapaima in connecting channels. The abundance of arapaima was positively related to the connectivity of the lake with other water bodies. The principal reason for arapaima to prefer habitats that are deep, large, and connected to other water bodies appears to be increased survival through lower susceptibility to extreme drought events and increased mobility and availability of food resources. Deeper, larger, and more connected lakes and connecting channels sustain greater arapaima populations; they can now be used to prioritize conservation efforts.
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Notes
Taxonomic status of the studied population remains uncertain (Castello and Stewart 2010), so we use only the genus name.
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Acknowledgements
We thank Valmir Lima, Sandro Carvalho Brandão, and several fishermen of the Jarauá Community for help in the field, especially Raimundinho Cordeiro and local fishers for doing population counts. Diego Pinheiro provided assistance with Fig. 1. Gecely Rocha, Gil Strenzel, Miguel Petrere, Sofia Campiolo, Donald Stewart and two anonymous reviewers provided valuable comments on the manuscript. We thank the following institutions for financial and/or logistic support: Instituto de Desenvolvimento Sustentável Mamirauá, Instituto Internacional de Educação do Brasil (BECA-IEB/Moore Foundation, process number B/2007/01/BMP/03), Universidade Estadual de Santa Cruz e Programa de Pós Graduação em Zoologia, Conselho Nacional de Pesquisa, Petrobrás, Moore Foundation (Grant to WHCR), Ministério da Ciência e Tecnologia.
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Arantes, C.C., Castello, L., Cetra, M. et al. Environmental influences on the distribution of arapaima in Amazon floodplains. Environ Biol Fish 96, 1257–1267 (2013). https://doi.org/10.1007/s10641-011-9917-9
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DOI: https://doi.org/10.1007/s10641-011-9917-9