Estrutura populacional de Macrobrachium potiuna (Crustacea, Palaemonidae) no Rio do Moinho, Mangaratiba, Rio de Janeiro, Brasil

Abstract

Population structure of Macrobrachium potiuna (Crustacea, Palaemonidae) in the Moinho's River, Mangaratiba, Rio de Janeiro, Brazil. Biota Neotrop. 9(1): http://www. biotaneotropica.org.br/v9n1/en/abstract?article+bn01309012009. (Müller, 1880) were collected in the Moinhos' River from July 2001 to June 2002. The aim of this study was providing some information about the population structure of this species. In the laboratory, the shrimps were sexed, measured and classified according to developmental stages: mature, immature and sexually undifferentiated. A total of 1162 shrimps was collected, being 52% immature, 46% matures and 2.6% sexually undifferentiated. The immature individuals showed a positive correlation with the water temperature, occurring with greater frequency until 21 °C. The total length varied from 9.5 to 49.1 mm, with males being the largest ones of the population. The size frequency distribution was characterized by two modes. The sex ratio of 1:1 was observed. A larger number of males was recorded in the spring and ovigerous females in the spring and summer. The juvenile recruitment took place in the autumn, by registering a time lag of four months between the peak of ovigerous females and the entrance of recruits. Abstract: Samples of Macrobrachium potiuna

Population biology of Macrobrachium jelskii (Miers, 1877) (Decapoda, Palaemonidae) from an artificial pond in Bahia, Brazil

“…By ruling out hermaphroditism, variations in the sex ratio of populations of Macrobrachium spp. might be explained by other factors, for instance: differences in migration rates, mortality, longevity and growth between the sexes (Wenner, 1972;Souza and Fontoura, 1996;Mantel and Dudgeon, 2005;Mattos and Oshiro, 2009), and different reproductive strategies (Mossolin and Bueno, 2002;Hayd and Anger, 2013;Rocha et al, 2015).…”

Distribution and abundance of freshwater decapods in an Atlantic rainforest catchment with a dammed future

“…Decapods, and especially shrimps look to be scarce and present a restricted distribution in Guapiacú river catchment when compared with other coastal catchments (Ammar et al, 2001;Mattos and Oshiro, 2009;Silveira, 1997), but this is difficult to confirm due to differences in sampling techniques. We found species that have different reproductive strategies: Trichodactylidae crabs and M. potiuna shrimp are freshwater specialized species that have the entire life cycle in freshwater, while M. olfersii and M. carcinus are amphidromous (Silveira, 1997) and depend on estuarine brackish water for the development of the first stages of larval growth.…”

“…Thus, stream size variation is a key factor influencing community structure of invertebrates (Cargnin-Ferreira and Forsberg, 2000), and fishes (Magalhães et al, 2002). Although the RCC does not make specific predictions regarding crustacean fauna, it may also be strongly influenced by these variations along the river course, but its relation is poorly studied, especially with respect to species inhabiting Atlantic forest streams (Mattos and Oshiro, 2009). …”

“…The knowledge of freshwater decapods in Brazil Atlantic coast has increased during the last decades, especially regarding their taxonomy, distribution (Bond-Buckup and Buckup, 1989;Magalhães, 2003;Magalhães et al, 2005;Mossolin and Mantelatto, 2008;Sampaio et al, 2009;Mossolin et al, 2016;Rocha and Bueno, 2011) and population structure (Ammar et al, 2001;Albertoni et al, 2002;Antunes and Oshiro, 2004;Mossolin and Bueno, 2002;Collins et al, 2006;Mattos and Oshiro, 2009). However, there is a lack of studies assessing effects of stream environmental variables on decapod communities in this area, which restricts our ability to conduct efforts for their conservation.…”

Abundance and spatial-temporal distribution of Macrobrachium surinamicum Holthuis, 1948 (Palaemonidae) in the Amazon estuary, north of Brazil

“…The occurrence and abundance of various species of decapod crustaceans are limited by environmental factors such as temperature and salinity, as in the case of M. potiuna (Müller, 1880), which was studied by Mattos and Oshiro (2009). These authors concluded that the predominance of immature shrimps during the months in which the water temperature did not exceed 21 °C indicated the close relationship between this abiotic factor and growth of individuals.…”