Shared or distinct responses between intermediate and satellite stream fish species in an altered Amazonian River?

Author(s)

Perez-Mayorga, Maria Angelica ^[1] ; Casatti, Lilian ^[1] ; Teresa, Fabricio Barreto ^[2] ; Brejao, Gabriel Lourenco ^[1]

Affiliation

^[1] Univ Estadual Paulista UNESP, Dept Zool & Bot, Sao Paulo - Brazil

^[2] Univ Estadual de Goias, Unidade Cincias Exatas & Tecnol, Anapolis, Go - Brazil

• Document type: Journal article
• Source: ENVIRONMENTAL BIOLOGY OF FISHES; v. 100, n. 12, p. 1527-1541, DEC 2017.
• Web of Science Citations: 2

Abstract

Environmental and spatial variables can distinctly influence the occupancy frequency distributions in stream fish. From a metacommunity context, we tested the following hypothesis, intermediate species are governed by dispersal and niche-based processes; in contrast, satellite species are governed by niche-based processes. To test this, we separately analyzed three data sets, the entire metacommunity, the intermediate species and the satellite species, using a forward selection of explanatory variables, and a partial Redundancy Distance Analysis. The fish and 31 variables of 52 stream reaches of a Brazilian river basin in the Western Amazon were collected during the dry period of 2012. The results for all of the data set revealed two different patterns: on one side, satellite species revealed that niche and dispersal-based processes were the most important; on the other side, for intermediate species and for all of the species set, only dispersal-based processes were the most important. For the data set including all of the species and the intermediate species, the variance was explained mainly by landscape scale variables. By contrast, the variance within the satellite species set was explained by local scale variables. Management efforts for intermediate species should be taking at larger scale, but they are usually less critical for the maintenance of aquatic biodiversity; on the other hand, management efforts for satellite species should be taken at smaller scale and based on specific biological and ecological information for the focal species. (AU)

• FAPESP's process: 15/05827-6 - Relationships between the deforestation process and the fish diversity patterns at Western Amazon streams
• Grantee: Gabriel Lourenço Brejão
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 12/21916-0 - Relationships among the deforestation process and the fish diversity patterns at Western Amazon streams
• Grantee: Gabriel Lourenço Brejão
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 10/17494-8 - Terra firme stream fish from Rio Machado Basin, RO
• Grantee: Lilian Casatti
• Support Opportunities: Regular Research Grants