Copepods of the genus Oithona from Cananéia region (Lat. 25º07'S, Long. 47º56' W)

Abstract

Some ecological aspects of two congeneric species of Cyclopoid copepods, Oithona ovalis and O. oligohalina have been studied for the first time in the estuarine region of Cananeia. The spatial distribution and seasonal variation of both species of Oithona are studied in relation to salinity, temperature and dissolved, oxygen. The results obtained are compared to previous work done in the area and to similar studies undertaken elsewhere.

Oithona Davisae, New Species, and Limnoithona Sinensis (Burckhardt, 1912) (Copepoda: Oithonidae) From the Sacramento-san Joaquin Estuary, California

“…In Cananeia, Brazil, two species of the second group, O. oligohalina (? neotropica, see Ferrari and Bowman, 1980, for comments) and O. ovalis, have been reported, associated with separate salinity zones (Fonseca and Prado, 1979).…”

“…Cyclopoid copepods of the family Oithonidae are cyclically abundant members of the planktonic fauna of many American temperate, subtropical, and tropical estuaries and embayments (Deevey, 1948(Deevey, , 1960Fish, 1936;Fonseca and Prado, 1979;Gonzalez and Bowman, 1965;Hopkins, 1966Hopkins, , 1977Lonsdale, 1981;and Lonsdale and Coull, 1977). Despite their importance in plankton communities, geographical distributions of many American estuarine oithonids are incompletely known.…”

Comparison of zooplankton community structure between impacted and non-impacted areas of Paranaguá Bay Estuarine Complex, south Brazil

“…Among oithonids, we observed that Oithona hebes was more abundant and frequent than Oithona oswaldocruzi. Both species are common in Brazilian estuaries (Rocha 1986), but they are segregated by their different salinity tolerances (Fonseca and Almeida Prado 1979). Oithona hebes prefers more saline waters (13-27 psu) compared with O. oswaldocruzi (3-16 psu; Fonseca and Almeida Prado 1979), which explains the dominance of O. hebes observed here.…”

“…Both species are common in Brazilian estuaries (Rocha 1986), but they are segregated by their different salinity tolerances (Fonseca and Almeida Prado 1979). Oithona hebes prefers more saline waters (13-27 psu) compared with O. oswaldocruzi (3-16 psu; Fonseca and Almeida Prado 1979), which explains the dominance of O. hebes observed here. Other mesozooplankton taxa that were periodically abundant at a given time were cirripedes, chaetognaths, cladocerans and decapods, but only cirripedes surpassed copepods in number.…”

“…Winkler et al 2003;Marques et al 2009). In the subtropical and tropical Southwest Atlantic, some works have focused on the distribution and occurrence of zooplankton (Fonseca and Almeida Prado 1979;Almeida Prado-Por and Lansac Tôha 1984;Krumme and Liang 2004;Dias et al 2009;Magalhães et al 2009). However, more studies are necessary to improve understanding of the role of copepods in subtropical and tropical estuaries, and environmental factors controlling this community, especially in the Paranaguá Bay Estuarine Complex, which is an important fishery ground and sustains both commercial and subsistence fisheries (Lana et al 2001).…”