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Seasonal dynamics of the fish assemblage in a floodplain lake at the confluence of the Negro and Amazon Rivers
- Source :
- Journal of Fish Biology. 89:194-212
- Publication Year :
- 2015
- Publisher :
- Wiley, 2015.
-
Abstract
- The temporal effect of discharge and limnology on fish composition and species diversity in a floodplain lake at the confluence of the Amazon and Negro Rivers was evaluated. Species richness, abundance and assemblage composition were strongly influenced by seasonal discharge of the Amazon and Negro Rivers, which affects lateral connectivity, water conductivity and temperature. As a consequence, temporal β-diversity was high in the lake and the assemblage was dominated by seasonally transient species. Relatively large species known to feed on resources within the floodplain were captured almost exclusively during the flood period. During the dry season, the assemblage was dominated by fishes adapted to harsh conditions of high temperature and low dissolved oxygen concentrations. An open system with high spatial and temporal heterogeneity created by the meeting of two large rivers with different water chemistry, Lago Catalao has a dynamic fish assemblage. Given its high temporal β-diversity and abundance of fishes, many of great importance in local fisheries, Lago Catalao and other floodplain lakes in this region merit special attention for conservation.
- Subjects :
- 0106 biological sciences
geography
geography.geographical_feature_category
Floodplain
Flood myth
Amazon rainforest
Ecology
010604 marine biology & hydrobiology
Limnology
Species diversity
Aquatic Science
Biology
010603 evolutionary biology
01 natural sciences
Confluence
Dry season
Species richness
Ecology, Evolution, Behavior and Systematics
Subjects
Details
- ISSN :
- 00221112
- Volume :
- 89
- Database :
- OpenAIRE
- Journal :
- Journal of Fish Biology
- Accession number :
- edsair.doi...........f6d8427303648848cd720d1c6659792b