The temporal distribution pattern of copepods in Corumbá Reservoir, State of Goiás, Brazil

The present study analyzed the pattern of temporal distribution of planktonic copepods in a recently formed reservoir and investigated whether there were differences in the predominance of species. The animals were collected at six stations in the limnetic zone of the central body and lateral arms o...

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Bibliographic Details
Published in:Hydrobiologia 2001-06, Vol.453-454 (1), p.375-384
Main Authors: Bonecker, C C, Lansac-tôha, F A, Velho, L F, M, Rossa, D C
Format: Article
Language:English
Subjects:
Animal reproduction
Biogeography
Copepoda
Crustaceans
Cyclopidae
Diaptomidae
Distribution patterns
Mesocyclops longisetus
Notodiaptomus iheringi
Plankton
Rainy season
Reservoirs
Temporal distribution
Thermocyclops decipiens
Thermocyclops minutus
Water levels
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Summary:The present study analyzed the pattern of temporal distribution of planktonic copepods in a recently formed reservoir and investigated whether there were differences in the predominance of species. The animals were collected at six stations in the limnetic zone of the central body and lateral arms of the reservoir with a motorized pump at different depths, from December 1996 through November 1998. Three species of Cyclopidae (Thermocyclops decipiens, Thermocyclops minutus and Mesocyclops longisetus) and one species of Diaptomidae (Notodiaptomus iheringi) were recorded. Adults and young, mainly nauplii, of the cyclopoids were predominant during the entire study period. Calanoids became numerically important after the third month following reservoir formation, in some months becoming approximately as abundant as the cyclopoids. There was succession in the abundance of the species, with T. decipiens predominating in the first six months, N. iheringi at the end of the first year, and T. minutus at the beginning of the second year. The differences in water level in the dry and rainy seasons and the operation of the reservoir affected the dynamics of certain copepod species.[PUBLICATION ABSTRACT]
ISSN:0018-8158
1573-5117
DOI:10.1023/A:1013142101266