Abstract
With the objective to analyze the temporary distribution of Pachyurus bonariensis larvae and its relationship with some environmental variable, collections were carried in the Sinha Mariana bay, Mato Grosso State, between March/2000 and March/2004, at 4:00 p.m. and at 10:00 p.m. Simultaneously, water samples were obtained to determine temperature of the water, dissolved oxygen, pH and electric conductivity. The largest densities were verified between the months of October and January, suggesting to be this the main period of reproduction of the species. However, larvae in preflexion and flexion were also found in the months of winter, possibly associated to the favorable conditions for the reproduction. Individuals of all of the stages were present, thus it is probable that the whole life cycle happens inside of the bay. The density of larvae more developed in the surface is larger at night, while the initial larvae are found in the surface in both schedules, thus the degree of larval development influences in the distribution pattern of the species in the column of water.
Highlights
O pantanal matogrossense constitui um dos maiores sistemas de áreas alagáveis contínuas da América do Sul, englobando um mosaico de diferentes habitats que sustenta a rica biota aquática e terrestre
A temperatura da água apresentou variação sazonal anual relacionada às estações climáticas, sendo que os maiores valores foram observados nos meses de novembro e dezembro e menores em julho e agosto, em ambos os horários (Figura 4A)
Os valores de pH variaram de 5,34 a 7,63, apresentando tendência sazonal e levemente ácido, com os menores valores em dezembro de 2001, em ambos os horários, e em maio e junho de 2003, às 22h (Figura 4C)
Summary
Situa-se em uma área de relevo aplainado, numa planície fluviolacustre, em zona de média inundação (FRANCO; PINHEIRO, 1982), conectando-se a oeste com o rio Cuiabá, por meio do Canal Boca do Leme e a leste recebe as águas da bacia do rio Mutum. O fundo é predominantemente arenoso e a profundidade média na área amostrada é de 1,55 m (AGOSTINHO et al, 2005)
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