scholarly journals Diet changes in fish species from a large reservoir in South America and their impact on the trophic structure of fish assemblages (Petit-Saut Dam, French Guiana)

2006 ◽  
Vol 42 (1) ◽  
pp. 53-61 ◽  
Author(s):  
B. de Mérona ◽  
R. Vigouroux
Keyword(s):  
South America ◽  
Fish Species ◽  
French Guiana ◽  
Trophic Structure ◽  
Fish Assemblages ◽  
Large Reservoir ◽  
Petit Saut

scholarly journals Phenotypic plasticity in fish life-history traits in two neotropical reservoirs: Petit-Saut Reservoir in French Guiana and Brokopondo Reservoir in Suriname

2009 ◽  
Vol 7 (4) ◽  
pp. 683-692 ◽  
Author(s):  
Bernard de Mérona ◽  
Jan Mol ◽  
Régis Vigouroux ◽  
Paulo de Tarso Chaves
Keyword(s):  
Life History ◽  
Phenotypic Plasticity ◽  
Fish Species ◽  
French Guiana ◽  
Life History Traits ◽  
Relative Length ◽  
Maximum Length ◽  
Batch Fecundity ◽  
Long Time ◽  
Petit Saut

Fish species are known for their large phenotypic plasticity in life-history traits in relation to environmental characteristics. Plasticity allows species to increase their fitness in a given environment. Here we examined the life-history response of fish species after an abrupt change in their environment caused by the damming of rivers. Two reservoirs of different age, both situated on the Guiana Shield, were investigated: the young Petit-Saut Reservoir in French Guiana (14 years) and the much older Brokopondo Reservoir in Suriname (44 years). Six life-history traits in 14 fish species were studied and compared to their value in the Sinnamary River prior to the completion of Petit-Saut Reservoir. The traits analyzed were maximum length, absolute and relative length at first maturation, proportion of mature oocytes in ripe gonad, batch fecundity and mean size of mature oocytes. The results revealed a general increase of reproductive effort. All species showed a decrease in maximum length. Compared to the values observed before the dam constructions, eight species had larger oocytes and three species showed an increased batch fecundity. These observed changes suggest a trend towards a pioneer strategy. The changes observed in Petit-Saut Reservoir also seemed to apply to the 30 years older Brokopondo Reservoir suggesting that these reservoirs remain in a state of immaturity for a long time.

Alteration of Fish Diversity Downstream from Petit-Saut Dam in French Guiana. Implication of Ecological Strategies of Fish Species

Hydrobiologia ◽  
2005 ◽  
Vol 551 (1) ◽  
pp. 33-47 ◽  
Author(s):  
Bernard de Mérona ◽  
Régis Vigouroux ◽  
Francisco Leonardo Tejerina-Garro
Keyword(s):  
Fish Species ◽  
French Guiana ◽  
Fish Diversity ◽  
Ecological Strategies ◽  
Petit Saut

scholarly journals Trophic structure of fish assemblages in the Lower Miranda River, Pantanal, Mato Grosso do Sul State, Brazil

2000 ◽  
Vol 60 (3) ◽  
pp. 389-403 ◽  
Author(s):  
E. K. de RESENDE
Keyword(s):  
Fish Species ◽  
Trophic Structure ◽  
Fish Assemblages ◽  
Trophic Guilds ◽  
Trophic Guild ◽  
Mato Grosso ◽  
River Floodplain ◽  
Mato Grosso Do Sul

Of a total of 101 fish species caught in the Lower Miranda River floodplain, 29 were omnivorous, 16 ichthyophagous, 12 herbivorous, 18 detritivorous, 8 zooplanktophagous, 7 insectivorous, 2 lepidophagous, 4 ichthyophagous/insectivorous and 4 zooplanktophagous/insectivorous. Almost half of the species belong to omnivorous and detritivorous trophic guilds. The same is not true when biomass is considered. The number of fish species by trophic guild didn't change along the year whereas the biomass changed significantly. The frequency of abundant fish species was not the same for the sampled environments.

Revision of the polytypic electric fish Gymnotus carapo (Gymnotiformes, Teleostei), with descriptions of seven subspecies

Zootaxa ◽  
2017 ◽  
Vol 4318 (3) ◽  
pp. 401 ◽  
Author(s):  
JACK M. CRAIG ◽  
WILLIAM G. R. CRAMPTON ◽  
JAMES S. ALBERT
Keyword(s):  
South America ◽  
Geometric Morphometrics ◽  
Fish Species ◽  
Phenotypic Variation ◽  
French Guiana ◽  
Electric Fish ◽  
Geographic Range ◽  
Phenotypic Differences ◽  
Vast Range ◽  
Parnaíba Basin

The banded knife fish Gymnotus carapo is among the most widely distributed, broadly adapted (eurytopic), and phenotypically variable fish species in South America, with a geographic range of about 14 million km2, from the Llanos of Venezuela to the Pampas of northern Argentina. Here we assess the structure of phenotypic variation in G. carapo across this vast range from a study of 486 specimens representing the G. carapo clade, including 175 specimens of G. carapo collected from across the continental platform. We use multivariate statistics to quantify phenotypic differences within and among subspecies and species in aspects of pigmentation, caliper-based morphometrics, geometric morphometrics, meristics, and osteology. Our results demonstrate significant, but not diagnostic, differences among specimens representing seven new subspecies: G. c. australis from the La Plata (Paraná-Paraguay) basin, G. c. caatingaensis from the Parnaíba basin in the Brazilian state of Piauí, G. c. carapo from Suriname and French Guiana, G. c. madeirensis from the upper Madeira basin, G. c. occidentalis from the western Amazon, Negro, and Essequibo basins, G. c. orientalis from the eastern Amazon, Tocantins and Trombetas basins, and G. c. septentrionalis from the Orinoco basin and Trinidad Island. These results support the use of the subspecies, but not the species, rank to recognize and name these regionally delimited taxonomic entities.  

scholarly journals First Assessment of the Benthic Meiofauna Sensitivity to Low Human-Impacted Mangroves in French Guiana

Forests ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 338
Author(s):  
Claire Michelet ◽  
Daniela Zeppilli ◽  
Cédric Hubas ◽  
Elisa Baldrighi ◽  
Philippe Cuny ◽  
...  
Keyword(s):  
South America ◽  
French Guiana ◽  
Ecological Status ◽  
Organic Enrichment ◽  
Strongly Correlated ◽  
Trophic Groups ◽  
Ecological State ◽  
Spatio Temporal ◽  
De Man ◽  
Main City

Bioindicators assess the mangroves ecological state according to the types of pressures but they differ with the ecosystem’s specificities. We investigated benthic meiofauna diversity and structure within the low human-impacted mangroves in French Guiana (South America) in response to sediment variables with various distances to the main city. Contaminant’s concentrations differed among the stations, but they remained below toxicity guidelines. Meiofauna structure (Foraminifera, Kinorhyncha, Nematoda) however varied accordingly. Nematode’s identification brought details on the sediment’s quality. The opportunistic genus Paraethmolaimus (Jensen, 1994) strongly correlated to the higher concentrations of Hg, Pb. Anoxic sediments were marked by organic enrichment in pesticides, PCB, and mangrove litter products and dominance of two tolerant genus, Terschellingia (de Man, 1888) and Spirinia (Gerlach, 1963). In each of these two stations, we found many Desmodora individuals (de Man, 1889) with the presence of epibionts highlighting the nematodes decreased fitness and defenses. Oxic sediments without contaminants were distinguished by the sensitive genera Pseudocella (Filipjev, 1927) and a higher diversity of trophic groups. Our results suggested a nematodes sensitivity to low contaminants concentrations. Further investigations at different spatio-temporal scales and levels of deterioration, would be necessary to use of this group as bioindicator of the mangroves’ ecological status.

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