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Feeding of holoshesthes Heterodon eigenmann (Teleostei, Cheirodontinae) of the cajuru reservoir (Minas Gerais, Brazil), in relation to the vegetal biomass on its depletion zone Zoologia
Alvim,Márcio Camilo Carvalho; Maia-Barbosa,Paulina Maria; Alves,Carlos Bernardo Mascarenhas.
Stomach contents of Holoshesthes heterodon Eigenmann, 1915 (Teleostei, Cheirodontinae), collected in the depletion zone of Cajuru reservoir when it was at its maximum water level in two stations with different vegetal densities, were studied in order to investigate the influence of the flooded vegetal biomass on the food quantity and quality ingested by fish. Eighteen individuals from each station were examined. The standard length was l.53±0.05 cm and l.52±0.05 cm, respectively at the lower biomass (8.19 kg diy weight/ha) and higher biomass (38.10 kg diy weight/ha) sampling stations. The stomach repletion Index (SRI) was applied for the quantitative analysis. The alimentary index (IAi) was used for the quali-quantitative analysis, with the volume of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish feeding; Reservoir; Depletion zone; Water level; Vegetal biomass; Holoshesthes heterodon.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751998000400018
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Length-weight relationships for five cladoceran species in an Amazonian lake BABT
Maia-Barbosa,Paulina Maria; Bozelli,Reinaldo Luiz.
This work shows the length-weight regressions established for the five most frequent and abundant cladoceran species (Bosmina hagmanni, Bosminopsis deitersi, Ceriodaphnia cornuta, Diaphanosoma birgei, and Moina minuta) in two stations at Lake Batata. This lake has received for 10 years very fine bauxite processing tailings, which is responsible for the thick layer over the natural sediment still observed in its western section (impacted station). The individuals were separated into size classes, the dry weight values were determined for each class and were used for establishing weight-length equations. Bosminopsis deitersi and Ceriodaphnia cornuta were the species showing the smallest size in the two sampled areas (0.152 to 0.322 mm) and Diaphanosoma...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amazonian lake; Zooplankton; Cladoceran; Length-weight relationships.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000200018
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Thermocyclops decipiens (Kiefer, 1929) (Copepoda, Cyclopoida) as indicator of water quality in the State of Minas Gerais, Brazil BABT
Landa,Giovanni Guimarães; Barbosa,Francisco Antonio Rodrigues; Rietzler,Arnola Cecilia; Maia-Barbosa,Paulina Maria.
The aim of this work was to study the possible utilization of Thermocyclops decipiens as indicator of the trophic degree and water quality of some watersheds of the state of Minas Gerais. From the beginning of the decade of 90, T. decipiens was recorded in several water collections of the state, including the basins of the rivers Paranaíba, São Francisco, Doce and Grande, within environments mainly of meso and eutrophics characteristics. Of the 28 places of occurrence of the species and according to the water quality index (WQI) used by Environmental Foundation of Minas Gerais (FEAM), 7 of these environments presented WQI good, 16 medium, 4 bad and one very bad. This classification corroborated the hypothesis that T. decipiens could be used as indicator...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Thermocyclops decipiens; Water quality; Bioindicator.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000400015
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