scholarly journals Food resources sustaining the fish fauna in a section of the upper São Francisco River in Três Marias, MG, Brazil

2004 ◽  
Vol 64 (2) ◽  
pp. 195-202 ◽  
Author(s):  
M. C. C. Alvim ◽  
A. C. Peret
Keyword(s):  
Aquatic Invertebrates ◽  
Fish Fauna ◽  
Stomach Contents ◽  
Food Resources ◽  
Trophic Guilds ◽  
Terrestrial Invertebrates ◽  
Sao Francisco River ◽  
Seasonal Flooding ◽  
São Francisco River

With the purpose of determining the principal food resources responsible for maintaining the fishery yield in a section of the São Francisco River, 6 sampling of the fish fauna were made downstream from the Três Marias Dam, from September 1996 to July 1997. A total of 1,127 individuals of 35 species were captured, using gillnets with mesh sizes varying from 3 to 16 cm. The stomach contents of 33 species were examined in order to determine their diets. Five trophic guilds were established, in the following order of importance: ilyophagous, herbivorous, piscivorous, terrestrial invertebrates feeders, and aquatic invertebrates feeders. The resources sustaining the fish fauna were mainly of allochthonous origin. The ichthyonenosis appears to be mainly dependent on the detritus chain. The ciliary forest and seasonal flooding pulses are the main suppliers of food for the fish fauna.

scholarly journals Diet seasonality and food overlap of the fish assemblage in a pantanal pond

2008 ◽  
Vol 6 (4) ◽  
pp. 567-576 ◽  
Author(s):  
Gisele Caroline Novakowski ◽  
Norma Segatti Hahn ◽  
Rosemara Fugi
Keyword(s):  
Fish Assemblage ◽  
Food Resource ◽  
Fish Fauna ◽  
Diet Breadth ◽  
Food Resources ◽  
Dry Season ◽  
Trophic Guilds ◽  
Trophic Specialization ◽  
Mato Grosso ◽  
Mean Values

We assessed the trophic structure of the fish fauna in Sinhá Mariana pond, Mato Grosso State, from March 2000 to February 2001. The aim was to determine the feeding patterns of the fish species during the rainy and dry seasons. The diets of 26 species (1,294 stomach contents) were determined by the volumetric method. Insects and fish were the most important food resources: insects were the dominant food of 23% and 27% of the species, respectively, in the rainy and dry season, and fish was the dominant item for 31% of the species in both seasons. Cluster analysis (Euclidean Distance) identified seven trophic guilds in the rainy season (detritivores, herbivores, insectivores, lepidophages, omnivores, piscivores and planktivores), and five trophic guilds in the dry season (detritivores, insectivores, lepidophages, omnivores and piscivores). The smallest mean values of diet breadth were observed for the specialist guilds (detritivores, lepidophages and piscivores), in both seasons. The widest means for diet breadth were observed for the omnivores, regardless of the season. In general, there was no seasonal variation in feeding overlap among the species studied. At the community level, diet overlap values between species were low (< 0.4) for 80% of the pairs in each season, suggesting wide partitioning of the food resource. The fish assemblage showed a tendency toward trophic specialization, regardless of the season, although several species changed their diets. We might consider two non-excludent hypothesis: that there is no pattern on the use of seasonal food resources and/or probably there are several patterns, because each one is based on characteristics of the studied site and the taxonomic composition of the resident species.

scholarly journals A poorly known case of watershed transposition between the São Francisco and upper Paraná river basins

2005 ◽  
Vol 3 (3) ◽  
pp. 449-452 ◽  
Author(s):  
Orlando Moreira Filho ◽  
Paulo Andreas Buckup
Keyword(s):  
River Basin ◽  
Fish Fauna ◽  
Rio Grande ◽  
River Basins ◽  
Hydroelectric Power ◽  
Sao Francisco River ◽  
Parana River ◽  
São Francisco River ◽  
Upper Paraná River ◽  
Parana Basin

During construction of the Furnas hydroelectric power dam in the upper rio Paraná basin in the early 1960s, the rio Piumhi drainage outflow was diverted into the headwaters of the São Francisco river basin. The rio Piumhi was a right bank tributary of the rio Grande, which unites with the rio Paranaíba to form the rio Paraná. The transposition allowed the entire fish fauna of the rio Piumhi and associated swamps, lakes, and tributaries to intermingle with the fish fauna of the São Francisco basin via the ribeirão Sujo, a right bank tributary of the São Francisco. The transposition of the watershed may have had a major impact on the current composition of the fish fauna of the upper rio São Francisco watershed.

scholarly journals Assessment of fish assemblage in an urban system, Itapecerica River, upper São Francisco River basin, Divinópolis, Minas Gerais, Brazil

Check List ◽  
2013 ◽  
Vol 9 (3) ◽  
pp. 482 ◽  
Author(s):  
Fabrício F.T. Domingos ◽  
Ralph G. Thomé ◽  
Rosy I.M.A. Ribeiro ◽  
Helena A.V. Souza ◽  
Hélio B. Santos
Keyword(s):  
Alien Species ◽  
River Basin ◽  
Fish Assemblage ◽  
Fish Fauna ◽  
Urban System ◽  
Migratory Fish ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Ecological Importance ◽  
High Level

Despite the economic and ecological importance of the Itapecerica River, there is no information about the local fish fauna. The aim of the present study was to provide a list of fish species in Itapecerica River, a tributary of the upper São Francisco River basin, inside an urban area. The specimens were collected quarterly from May 2010 to February 2012, using casting nets, trawl net and gillnets. We listed 29 species belonging to 21 genera of 14 families and 4 orders. Characiformes were represented by 16 species, Siluriformes by nine, Gymnotiformes and Perciformes by two each. Three alien species and five migratory fish were recorded. The low number of species found in this study in relation to São Francisco basin, could be reflecting the high level of degradation of waters in the Itapecerica River.

Diet of the Murray Turtle, Emydura-Macquarii (Gray) (Testudines, Chelidae)

1986 ◽  
Vol 13 (1) ◽  
pp. 65 ◽  
Author(s):  
BC Chessman
Keyword(s):  
Aquatic Macrophytes ◽  
Aquatic Invertebrates ◽  
New South ◽  
Stomach Contents ◽  
Filamentous Algae ◽  
Terrestrial Invertebrates ◽  
Dietary Shift ◽  
South Wales ◽  
Murray River ◽  
Males And Females

Examination of the stomach contents of 122 E. macquarii from the Murray River, Lake Boga and other waters in northern Victoria and southern New South Wales showed that this species is an opportunistic omnivore. In order of decreasing importance the main food types were filamentous algae, vertebrate (mainly fish) carrion, detritus, periphyton (including sponges), mobile aquatic invertebrates, aquatic macrophytes and terrestrial invertebrates. There was a degree of dietary shift with turtle size, small specimens containing more detritus and periphyton and less filamentous algae, macrophytes and carrion than bigger ones. The diets of mature males and females did not differ appreciably. Diel changes in stomach content volumes indicated that E. macquarii feeds mainly during the daytime.

scholarly journals Fish fauna of the Pandeiros River, a region of environmental protection for fish species in Minas Gerais state, Brazil

Check List ◽  
2015 ◽  
Vol 11 (1) ◽  
pp. 1507 ◽  
Author(s):  
Udson Santos ◽  
Priscilla Caroline Silva ◽  
Lucas Caetano Barros ◽  
Jorge Abdala Dergam
Keyword(s):  
Environmental Protection ◽  
Fish Species ◽  
Sustainable Use ◽  
Fish Fauna ◽  
Minas Gerais ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Minas Gerais State ◽  
Peacock Bass ◽  
A New Species

The Area of Environmental Protection of the Pandeiros River is the largest unit for sustainable use in Minas Gerais state, Brazil. The Pandeiros Wetland in the lower part of this river is considered a nursery for most migratory fish species of the São Francisco River and it is currently threatened by the introduced peacock-bass Cichla piquiti (Kullander & Ferreira, 2006). In this study, a list of fish species from the Pandeiros River was developed and compared with data for populations from other regions in the São Francisco basin. The presence of a new species record for the São Francisco River basin in the Pandeiros, and the particular local biotic and abiotic conditions of that river, support its recognition as an important conservation unit within the basin.

scholarly journals Diet shifts related to body size of the pirambeba Serrasalmus brandtii Lütken, 1875 (Osteichthyes, Serrasalminae) in the Cajuru Reservoir, São Francisco River Basin, Brazil

2004 ◽  
Vol 64 (1) ◽  
pp. 117-124 ◽  
Author(s):  
A. K. Oliveira ◽  
M. C.C. Alvim ◽  
A. C. Peret ◽  
C. B. M. Alves
Keyword(s):  
Body Size ◽  
River Basin ◽  
Stomach Contents ◽  
Cluster Method ◽  
Insect Larvae ◽  
Food Category ◽  
Food Component ◽  
Sao Francisco River ◽  
Fish Flesh ◽  
São Francisco River

This study aimed to identify shifts in the Serrasalmus brandtii Lütken, 1875 diet related to body size. Specimens were collected from April 1992 to January 1993 at the Cajuru Reservoir, in the Pará River, São Francisco River Basin, by seining the shore with nets of nylon, 1 mm opening, and with gill nets. Stomach contents of 152 individuals measuring 15-192 mm SL were examined. Food items were identified and weighed separately. For qualitative analysis, the frequency of occurrence method was used. The relative importance of each food component was determined based on the alimentary index (IAi). The frequencies of occurrence data were subjected to cluster analysis using the Canberra coefficient of dissimilarity and UPGMA as the cluster method. Distinctive gradual changes in food habits, associated with body size, were identified in this species. The smaller individuals fed predominantly on microcrustaceans and insect larvae. The intermediate size classes ingested insects, fish fins, fish scales, and chunks of fish flesh, in this order of importance. For the larger pirambebas, fish was the most abundant food category identified, followed by insects.

scholarly journals Diet and trophic structure of the fish fauna in a subtropical ecosystem: impoundment effects

2013 ◽  
Vol 11 (4) ◽  
pp. 891-904 ◽  
Author(s):  
Rosilene Luciana Delariva ◽  
Norma Segatti Hahn ◽  
Elaine Antoniassi Luiz Kashiwaqui
Keyword(s):  
Trophic Structure ◽  
Feeding Habits ◽  
Spatial Scales ◽  
Fish Fauna ◽  
Stomach Contents ◽  
Trophic Guilds ◽  
Before And After ◽  
Temporal And Spatial ◽  
Nmds Analysis ◽  
Iguaçu River

This study examined the diet and trophic structure of the fish fauna, over temporal and spatial scales, as affected by the impoundment of the Iguaçu River in the region of Salto Caxias, Paraná State, Brazil. Sampling was conducted before (March 1997 - February 1998) and after the impoundment (March 1999 - February 2000), at four sampling sites. The stomach contents were analyzed by the volumetric method. The species could be organized in 10 trophic guilds: algivores, carcinophages, detritivores, herbivores, aquatic insectivores, terrestrial insectivores, invertivores, omnivores, piscivores, and planktivores; the first and last guilds were represented only in the post-impoundment period. Similarity patterns and feeding changes were summarized by a non-metric Multi-dimensional Scaling (nMDS) analysis and statistically tested by a Permutational multivariate analysis of variance (PERMANOVA). Most species showed feeding changes, except for the piscivores and detritivores. These changes were related to the temporal factor (impoundment phases), such as reduced intake of benthic organisms and allochthonous food, which were usually replaced by resources from the reservoir itself (algae, microcrustaceans, and fish), simplifying the food spectrum of the fish fauna. A different indicator of food resources (IndVal) corroborated these changes in the feeding of the species. The proportions of the trophic guilds evaluated based on the catch per unit of effort (CPUE) and tested by ANOSIM were significantly different before and after the impoundment. Herbivores and piscivores were the guilds that contributed (SIMPER) to these differences, especially the high increase in biomass of the piscivore guild after the impoundment. Variations in the abundance of trophic guilds were more directly related to changes in the feeding habits of the fish fauna than to increases in the number and biomass of the species that constitute these guilds.

scholarly journals Use of food resources by the fish fauna of a small reservoir (rio Jordão, Brazil) before and shortly after its filling

2006 ◽  
Vol 4 (3) ◽  
pp. 357-362 ◽  
Author(s):  
Valdirene E. Loureiro-Crippa ◽  
Norma S. Hahn
Keyword(s):  
Food Supply ◽  
Fish Fauna ◽  
Stomach Contents ◽  
Detrended Correspondence Analysis ◽  
Food Resources ◽  
Limiting Factor ◽  
Trophic Groups ◽  
Small Reservoir ◽  
Risk Of Extinction ◽  
Before And After

The construction of dams brings about changes in the course of a river, which directly or indirectly affect the fish fauna. Alterations in the food resources available to the fish favor some species and deter others. In addition to the implications originating from damming, Jordão Reservoir has a characteristically large number of endemic species that, because of the impacts they have undergone, run the risk of extinction. In this study, we investigate the feeding flexibility of the fishes faced with alterations in the food supply through the assessment of the diet and trophic organization of the fish fauna (before and after the damming). Diet was determined analyzing 1,861 stomach contents from 27 fish species. Eight of this species were not caught after the damming. Detrended Correspondence Analysis (DCA) discriminated seven trophic groups. Omnivorous, insectivorous and invertivorous species had more temporal alterations in their diets. These changes altered the composition (in abundance and biomass) of the trophic groups, mainly after the damming. The detritivorous and piscivorous species maintained their diets during all study period. Analyses showed that about 75% of the species quickly changed their diets according to alterations in food supply. This implies that food is not a limiting factor (at first) for the maintenance of fish fauna of this reservoir, at least for the species that persisted after the filling.

scholarly journals Community structure of aquatic insects (Ephemeroptera, Plecoptera, and Trichoptera) in Cerrado streams of Paraguay, Paraná, and São Francisco river basins

2013 ◽  
Vol 13 (1) ◽  
pp. 97-107 ◽  
Author(s):  
Renato de Mei Romero ◽  
Mônica Ceneviva-Bastos ◽  
Gustavo Henrique Baviera ◽  
Lilian Casatti
Keyword(s):  
Community Structure ◽  
Aquatic Insects ◽  
Regional Differences ◽  
River Basins ◽  
Taxonomic Composition ◽  
Taxonomic Resolution ◽  
Sao Francisco River ◽  
Original Distribution ◽  
São Francisco River

We evaluated qualitatively and quantitatively the community structure of aquatic insects (Ephemeroptera, Plecoptera, and Trichoptera) in 19 streams in areas of Cerrado in the Paraguay, Paraná, and São Francisco river basins. The number of genera and taxonomic composition were compared at spatial (at the hydrographic basins level) and conservation levels (more preserved and less preserved areas). The influence of spatial and environmental factors in richness and abundance was also evaluated. The geographical distribution of Grumicha, Coryphorus, and Austrotinodes was expanded. The highest Trichoptera richness was found in the São Francisco river basin (F = 5,602, p = 0,004) and a higher number of Ephemeroptera genera occurred in the relatively less preserved sites (F = 6,835, p = 0,009). The pattern of genera distribution was different among basins (R = 0,0336, p = 0,001), but it was similar among relatively less and more preserved areas (R = -0,039, p = 0,737). These findings can be explained by the low impact level in these streams and also by the taxonomic resolution used in this study. Latitude and instream diversity were the most important factors to explain the variation in genera richness and abundance (p = 0.004 and p = 0.026, respectively). Hence, the regional differences can be attributed to spatial influences, quantity or quality of habitats and the original distribution of taxa within each basin.

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