Spatial and temporal distribution of ''curvina'' larvae (Plagioscion squamosissimus HECKEL, 1840) and its relationship to some environmental variables in the upper Paraná River floodplain, Brazil

Brazilian Journal of Biology

M. S. T. Baumgartner²  K. Nakatini²  G. Baumgartner¹  M. C. Makrakis¹ 

[1] ,Universidade Estadual de Maringá Departamento de Biologia Maringá Paraná ,Brazil

关键词: ''Curvina'' larvae;    Plagioscion squamosissimus;    distribution;    floodplain;    Upper Paraná River;    larvas de curvina;    Plagioscion squamosissimus;    distribuição;    planície de inundação;    alto rio Paraná;   

DOI  :  10.1590/S1519-69842003000300004

来源: SciELO

【 摘 要 】

With the objective of studying the spatial and temporal distribution of ''curvina'' Plagioscion squamosissimus larvae and verifying respective spawning sites, monthly sampling was carried out from March 1993 to February 1994 on the Upper Paraná River floodplain. Using a conical-cylindrical plankton net (0.5 mm mesh), samples were taken from the surface of the water bodies, and in the marginal vegetation a strainer and a dragnet (''picaré'') were used. Water samples were collected for environmental variable analysis (temperature, dissolved oxygen, water pH, and electrical conductivity). Water level data were obtained from hydrometric stations. High average density of larvae was found from December 1993 to February 1994 due to high temperature and water level. The Baía sub-area was shown to be the most important in the larvae catch, probably due to its semi-lotic characteristics. Larvae size distribution was shown to be more frequent in the 4.0 mm standard length class, indicating that the sampling stations were next to the spawning sites.

【 授权许可】

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