Population structure and reproductive biology of Metamysidopsis neritica (Crustacea: Mysidacea) in a sand beach in south Brazil

Abstract

Mysidacea are common sublittoral crustaceans that inhabit all coasts in the world. In this study, the population characteristics and the reproductive biology of Metamysidopsis neritica Bond-Buckup & Tavares, 1992 were studied in the surf zone of a south Brazilian beach (Atami). Mysids were sampled at monthly intervals from August, 1999 to July, 2000 (total of 29,490 individuals). Individuals were classified into six population categories. The highest abundance occurred in May (8,665) and August (6,415), and lowest in September (336) and December (368). Three main generations were identified, namely the summer, fall and winter generations. The winter generation was the longest (four to five months). The fall generation lasted four months, and the summer one extended from three to four months. Ovigerous females occurred throughout the year, with a greater proportion in July. The number of eggs or larvae varied from one to 16. Weak associations were found between female length and egg number, egg volume, and the number of larvae with and without eyes. Egg volume increased during the coldest season, whereas the smallest values were recorded during summer. These results suggest a possible direct relationship between egg volume and generation longevity.

Population structure and reproductive biology of Mesopodopsis orientalis (Crustacea: Mysida) in a tropical mangrove ecosystem in India

“…Variation in sex ratio of M. orientalis during sampling period was not significantly different from 1. The same was reported for Metamysidopsis neritica (Calil and Borzone, 2008) and M. elongata atlantica (Gama and Zamboni, 1999). …”

“…Neomysis Americana (Pezzack and Corey, 1979); Metamysidopsis neritica (Calil and Borzone, 2008). Variation in sex ratio of M. orientalis during sampling period was not significantly different from 1.…”

“…Calil and Borzone (2008) This can hardly be distinguished in field data. However, the study of length-frequency histograms of mature mysids often aid in the interpretation of population biology (Mauchline, 1980).…”

The barred grunt Conodon nobilis (Perciformes: Haemulidae) in shallow areas of a tropical bight: spatial and temporal distribution, body growth and diet

“…Although the local plankton community has not been studied, in other fish species the diet composition shifted considerably from season to season Pombo et al 2013), which indicates that C. nobilis may indeed have a strong preference for mysids and supports its characterization as a specialist feeder, at least as late juveniles (5-11 cm). Mysids are common in the swash zone off sandy beaches, where they may burrow in the sand during the day or enter the water column at night (Calil and Borzone 2008), somewhat matching the occurrence of C. nobilis in sandy-beach environments.…”

Revision of mysids (Crustacea: Peracarida: Mysida) zoogeographical distribution in the south-west Atlantic (0° to 40°S)

“…Later, studies by local and foreign scientists broadened the knowledge about regional mysid species richness with the description of new species from Brazilian (Bȃcescu, 1968a(Bȃcescu, , b, c, 1969(Bȃcescu, , 1984(Bȃcescu, , 1986Silva, 1970aSilva, , b, 1971aSilva, , b, 1972Silva, , 1974Silva, , 1979aReis & Silva, 1987; and Argentine waters (Hoffmeyer, 1993;Carcedo et al, 2013). To date, a limited amount of investigations concerning their biology (Loureiro Fernandes & Gama, 1996;Rörig et al, 1997;Gama & Zamboni, 1999;Gama et al, 2002Gama et al, , 2006Gama et al, , 2011, distribution and/or population structure Almeida Prado, 1973González, 1974;Silva, 1979b;Hoffmeyer, 1990;Tavares & Bond-Buckup, 1990; Tararam et al, 1996;Bond-Buckup & Tavares, 1998;Fries, 1999;Calliari et al, 2001Calliari et al, , 2007Schiariti et al, 2004Schiariti et al, , 2006Viñas et al, 2005;Cardelli et al, 2006;Borzone et al, 2007;Gama et al, 2007;Calil & Borzone, 2008;Gama, 2008) have been completed in the south-west Atlantic. In the late 1990s, Murano (1999) performed the most comprehensive review available to date of the mysidacean fauna (orders Mysida and Lophogastrida) of the South Atlantic Ocean, considering marine coastal and deep waters, including geographical and vertical distribution, detailed descriptions and illust...…”