scholarly journals Spatial variations in fish assemblage structure in a southeastern Brazilian reservoir

2016 ◽  
Vol 76 (1) ◽  
pp. 185-193 ◽  
Author(s):  
B. O. Sanches ◽  
R. M. Hughes ◽  
D. R. Macedo ◽  
M. Callisto ◽  
G. B. Santos
Keyword(s):  
Fish Assemblage ◽  
Assemblage Structure ◽  
Spatial Variations ◽  
Fish Assemblage Structure ◽  
Longitudinal Gradient ◽  
Parana Basin ◽  
Riverine Systems ◽  
Pimelodus Maculatus ◽  
Strong Adaptation ◽  
Neotropical Ichthyofauna

Abstract We assessed the fish assemblage structure and composition of Nova Ponte Reservoir (Araguari River, Upper Paraná Basin, Brazil). We observed significant differences in abundance (p = 0.0003), richness (p = 0.0005) and diversity (p = 0.02) between lacustrine and riverine zones of the reservoir. Nine species were significantly more abundant in the riverine region: Astyanax altiparanae, Astyanax gr. fasciatus, Galeocharax knerii, Hoplias intermedius, Hypostomus sp., Leporinus friderici, Leporinus obtusidens, Pimelodus maculatus and Schizodon nasutus. The results indicated a longitudinal gradient in the composition and abundance of fishes in Nova Ponte Reservoir, reinforcing the importance of freely flowing riverine reaches for conserving native neotropical ichthyofauna and reflecting the strong adaptation of these species to riverine systems.

scholarly journals Fish assemblage in a dammed tropical river: an analysis along the longitudinal and temporal gradients from river to reservoir

2010 ◽  
Vol 8 (3) ◽  
pp. 599-606 ◽  
Author(s):  
Bianca de Freitas Terra ◽  
Alex Braz Iacone dos Santos ◽  
Francisco Gerson Araújo
Keyword(s):  
Fish Assemblage ◽  
Transitional Zone ◽  
Assemblage Structure ◽  
Fish Assemblage Structure ◽  
Wet Season ◽  
Tropical River ◽  
Longitudinal Gradient ◽  
Species Overlap ◽  
Seasonal Flow ◽  
Paraíba Do Sul River

We analysed changes in the fish assemblage structure along a longitudinal gradient of the Paraíba do Sul River and Funil Reservoir. We tested the hypothesis that shifts from lotic to lentic environment affect the richness and structure of the assemblage which are modulated by seasonal rainfall changes. Standardised monthly samplings were carried out from October 2006 to September 2007 in four zones: 1) river upstream from the reservoir; 2) upper part of the reservoir; 3) lower part of the reservoir, and 4) river downstream from the reservoir. Fishes were caught using gillnets deployed for 15 hours. We collected a total of 4550 specimens, representing 35 species and 5 orders. The highest richness and diversity were recorded in zone 2, the transitional zone between river and reservoir. In this ecotone, lotic and lentic species overlap. Greater abundance and biomass was recorded in the river upstream from the reservoir (zone 1); however, there are no differences between the zones in the structure of assemblages during the wet season. During the dry season, the assemblage structure is more differentiated between zones, although no differences in abundance and biomass occur. The seasonal flow of the river is the major driving factor to influence the fish assemblage structure along the longitudinal gradient from the river to the reservoir.

scholarly journals Rocky reef fish assemblage structure in coastal islands of Southern Brazil

2015 ◽  
Vol 2 ◽  
Author(s):  
Daros Felippe ◽  
Bueno Leonardo ◽  
Soeth Marcelo ◽  
Bertoncini Athila ◽  
Hostim-Silva Mauricio ◽  
...  
Keyword(s):  
Reef Fish ◽  
Fish Assemblage ◽  
Assemblage Structure ◽  
Rocky Reef ◽  
Fish Assemblage Structure ◽  
Southern Brazil ◽  
Reef Fish Assemblage ◽  
Rocky Reef Fish

Preliminary Study of Fish Assemblage Structure of the Marine Protected Area of Cayar in Senegal

2018 ◽  
Vol 07 (01) ◽  
Author(s):  
Ousmane Diankha ◽  
Fatima BA ◽  
Alassane Sarr ◽  
Hameth Diaw Diadhiou ◽  
Mamadou Diop ◽  
...  
Keyword(s):  
Fish Assemblage ◽  
Protected Area ◽  
Marine Protected Area ◽  
Assemblage Structure ◽  
Fish Assemblage Structure ◽  
Preliminary Study
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