scholarly journals Slipper lobsters (Scyllaridae) off the southeastern coast of Brazil: relative growth, population structure, and reproductive biology

2014 ◽  
Vol 113 (1) ◽  
pp. 55-68 ◽  
Author(s):  
Luis Felipe de Almeida Duarte ◽  
Evandro Severino-Rodrigues ◽  
Marcelo A. A. Pinheiro ◽  
Maria A. Gasalla
Keyword(s):  
Population Structure ◽  
Reproductive Biology ◽  
Relative Growth ◽  
Southeastern Coast

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

2008 ◽  
Vol 25 (3) ◽  
pp. 403-412 ◽  
Author(s):  
Patrícia Calil ◽  
Carlos A. Borzone
Keyword(s):  
Population Structure ◽  
Reproductive Biology ◽  
Direct Relationship ◽  
Surf Zone ◽  
Population Characteristics ◽  
Egg Volume ◽  
Sand Beach ◽  
The World ◽  
Egg Number ◽  
South Brazil

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.

scholarly journals Reproductive biology of Palythoa caribaeorum and Protopalythoa variabilis (Cnidaria, Anthozoa, Zoanthidea) from the southeastern coast of Brazil

2005 ◽  
Vol 65 (1) ◽  
pp. 29-41 ◽  
Author(s):  
H. K. Boscolo ◽  
F. L. Silveira
Keyword(s):  
Reproductive Biology ◽  
High Frequency ◽  
Sao Paulo ◽  
São Paulo ◽  
Southeastern Coast ◽  
Female Sex ◽  
Sperm Release ◽  
Palythoa Caribaeorum ◽  
Maturation Stages

The reproductive biology of Palythoa caribaeorum (Duchassaing & Michelotti 1860) and Protopalythoa variabilis (Duerden 1898) was studied through monthly samples from tagged colonies from June 1996 to June 1997, in São Sebastião channel, São Paulo, Brazil (45º26'W, 23º50'S). The gametogenesis was similar to that of other zoanthids as shown by histological preparations. Oocyte diameters and maturation stages of testis vesicles were evaluated on squash preparations. Both species showed sequential protogynic hermaphroditism, with high frequency of fertile polyps (83% in P. variabilis and 72% in P. caribaeorum), high frequency of colonies in female sex condition (65.3% of P. variabilis and 41.7% of P. caribaeorum), and apparently continuous gametogenesis. In P. caribaeorum, egg release was continuous and sperm release took place during half of the analyzed period. In P. variabilis, egg and sperm release occurred in April-May and February-March 1997, respectively.

Biometric relationships of the Argentinean prawn Artemesia longinaris (Decapoda: Penaeidae) in the south-western Atlantic

2010 ◽  
Vol 90 (7) ◽  
pp. 1385-1393 ◽  
Author(s):  
L.F.C. Dumont ◽  
F. D'Incao
Keyword(s):  
Population Structure ◽  
Marked Reduction ◽  
The Other ◽  
Distribution Area ◽  
Southern Brazil ◽  
Simple Linear Regression ◽  
The South ◽  
Western Atlantic ◽  
Relative Growth ◽  
Autumn And Winter

Biometric relationships of size and weight were estimated for the Argentinean prawn (Artemesia longinaris), a new commercial penaeid prawn exploited in the south-western Atlantic. Morphometric and meristic traits were used to elucidate population structure of this species along its distribution area. The morphological relationships were estimated by a simple linear regression, considering total length (TL) as the dependent variable. The males collected in southern Brazil, an area under influence of the Subtropical Convergence, presented a slightly lower TL increment than females. A marked reduction in slopes of males between populations from southern Brazil was observed in autumn and winter. Additionally, relative growth in length of males from Argentina is similar to that observed during autumn and winter in southern Brazil. The other morphometric and meristic variables used also indicated higher similarities between southern Brazil and Argentina, which may be explained by relative growth associated to water temperatures or migration during winter, taking advantage of the oceanographic systems connecting both sites. Moreover, the population from Rio de Janeiro seems morphologically apart from the others, forming a separate unit stock.

Reproductive biology and population structure of Potimirim brasiliana Villalobos, 1959 (Decapoda, Atyidae) from a littoral fast-flowing stream, São Paulo State, Brazil

Crustaceana ◽  
2013 ◽  
Vol 86 (1) ◽  
pp. 67-83 ◽  
Author(s):  
Sergio Schwarz Da Rocha ◽  
Roberto Munehisa Shimizu ◽  
Sergio L. De Siqueira Bueno ◽  
Fernando L. Mantelatto
Keyword(s):  
Population Structure ◽  
Reproductive Biology ◽  
Sao Paulo ◽  
São Paulo ◽  
Paulo State ◽  
São Paulo State ◽  
Flowing Stream

Population Structure and Reproductive Biology of Saururus cernuus L. (Saururaceae)

1994 ◽  
Vol 9 (1) ◽  
pp. 47-55 ◽  
Author(s):  
LEONARD B. THIEN ◽  
ERIK G. ELLGAARD ◽  
MARGARET S. DEVALL ◽  
SARA E. ELLGAARD ◽  
PAUL F. RAMP
Keyword(s):  
Population Structure ◽  
Reproductive Biology
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