A tale of two lakes: Fish introduction and the biodiversity of upland Amazonian lakes

Detalhes bibliográficos
Ano de defesa: 2016
Autor(a) principal: Nobre, Regina Lúcia Guimarães
Orientador(a): Carneiro, Luciana Silva
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: eng
Instituição de defesa: Não Informado pela instituição
Programa de Pós-Graduação: PROGRAMA DE PÓS-GRADUAÇÃO EM ECOLOGIA
Departamento: Não Informado pela instituição
País: Brasil
Palavras-chave em Português:
Link de acesso: https://repositorio.ufrn.br/jspui/handle/123456789/25904
Resumo: Astyanax bimaculatus was artificially introduced in Violão lake, an upland Amazonian lake located on Serra dos Carajás/Brazil. This fish became abundant there, but is absent across nearby fishless lakes with similar characteristics, as is the case of Amendoim lake. This study aimed to test predictions of food-web theory regarding effects of a top predator fish introduction in these systems. Data series of biotic variables sampled on both Violão and Amendoin lakes from 2010 to 2013 were used. Lakes were very distinct regarding the structure and composition of macroinvertebrates, with communities being richer and more abundant in Amendoim lake. A difference on zooplankton composition was detected but no consistent effects were observed regarding zooplankton structure. Phytoplankton in Violão lake presented higher richness and chlorophyll-a biomass. Differences found at ecosystem-scale for macroinvertebrates community suggests descendent effects of A. bimaculatus translocation are more consistent in benthic-littoral communities than on planktonic communities. Results also indicates that A. bimaculatus has potential to couple pelagic and littoral habitat trough nutrient recycling. Our results showed differences between lakes are within the description of omnivorous fish effects on aquatic systems and thus, considering the effects of fish translocation in such aquatic ecosystems is pivotal for preserving local biodiversity.