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- Title
Length-weight relationships and biomass of the main microcrustacean species of two large tropical reservoirs in Brazil.
- Authors
Brito, S. L.; Maia-Barbosa, P. M.; Pinto-Coelho, R. M.
- Abstract
Length-weight equations were determined for the main microcrustacean species of Tres Marias and Furnas reservoirs (state of Minas Gerais, Brazil), and evaluated the fluctuations of their biomass. We examined the following species: Thermocyclops minutus, Bosminopsis deitersi, Bosmina hagmanni, Ceriodaphnia cornuta, and Moina minuta (Très Marias Reservoir), and Notodiaptomus henseni, Daphnia ambigua, Ceriodaphnia silvestrii, Diaphanosoma spinulosum, D. fluviatile, and Bosmina freyi (Furnas Reservoir). Dry weight was obtained in a microbalance for each size class (Cladocera) or developmental stage (Copepoda). Microcrustacean mean biomass varied from 5.76 mg DW.m-3 and 20.36 mg DW.m-3 (Furnas Reservoir) and from 3.75 mg DW.m-3 and 18.14 mg DW.m-3 (Très Marias Reservoir). Significant differences (p < 0.000) between seasons were registered with higher biomass during the rainy sea-sons. Thermocyclops minutus was the most important species in Très Marias, whereas in Furnas, N. henseni contributed in equal proportion. In Furnas, the higher cladoceran biomass was explained by the contribution of larger-sized species, such as D. ambigua, C. silvestrii, D. spinulosum, and D. fluviatile. Even though both reservoirs are considered oligotrophic, there were significant differences in the estimated microcrustacean biomass, which reinforces the importance of this parameter for the description of the real contribution of each species in the community.
- Subjects
MINAS Gerais (Brazil); TROPICS; BIOMASS; CRUSTACEAN size; DEVELOPMENTAL biology; COPEPODA; TRES Marias Reservoir (Brazil)
- Publication
Brazilian Journal of Biology, 2013, Vol 73, Issue 3, p593
- ISSN
1519-6984
- Publication type
Article
- DOI
10.1590/S1519-69842013000300017