Seasonal variations in the biochemical composition and reproductive cycle of the ghost crabOcypode quadrata(Fabricius, 1787) in Southern Brazil

2010 ◽  
Vol 9999A ◽  
pp. n/a-n/a ◽  
Author(s):  
Graziani de Freitas Antunes ◽  
Ana Paula Nunes do Amaral ◽  
Fabiana Pinto Ribarcki ◽  
Elenir de Fátima Wiilland ◽  
Denise Maria Zancan ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Seasonal Variations ◽  
Biochemical Composition ◽  
Southern Brazil

Seasonal variations in biochemical composition during the reproductive cycle of the intertidal gastropod Thais lamellosa Gmelin (Gastropoda, Prosobranchia)

1974 ◽  
Vol 52 (3) ◽  
pp. 305-318 ◽  
Author(s):  
Philip Lambert ◽  
Paul A. Dehnel
Keyword(s):  
Digestive Gland ◽  
Reproductive Cycle ◽  
Seasonal Variations ◽  
Biochemical Composition ◽  
Feeding Activity ◽  
Lipid Reserve ◽  
Low Level ◽  
Biochemical Constituents ◽  
Histological Sections ◽  
Intertidal Gastropod

Seasonal variations in biochemical constituents of Thais lamellosa Gmelin in relation to the reproductive cycle were studied. Digestive gland, foot muscle, and gonad were analyzed for protein, glycogen, lipid, and ash for 1 year. Data on feeding and gamete maturation were obtained from histological sections of digestive gland and gonad. Major periods of feeding activity occurred in April and August. The spawning peak was in March and gametogenesis began in July. Maximum glycogen levels coincided with major feeding periods but reserves in the digestive gland were mainly lipid. This lipid reserve was used during the winter. Glycogen was at a relatively low level in all tissues and appeared to be used by the developing gonad. The foot muscle stored neither lipid nor glycogen to any appreciable extern.During winter the digestive gland index decreased as reserves were used. The ovary index held constant from October to February then dropped sharply with spawning. Animals kept for the same period under artificial summer conditions showed no decrease in the digestive gland index, but a decrease in the ovary index. Few oogonia reached maturity and many were resorbed. Starved animals used more protein from the ovary than fed animals.

scholarly journals Distribution and reproductive biology of the Electric ray Discopyge tschudii Heckel, 1846 in San Matías Gulf, Northern Patagonia, Argentina

2011 ◽  
Vol 9 (4) ◽  
pp. 831-838 ◽  
Author(s):  
Marilú Estalles ◽  
Nidia Marina Coller ◽  
Edgardo Ernesto Di Giácomo ◽  
María Raquel Perier
Keyword(s):  
Sexual Dimorphism ◽  
Reproductive Biology ◽  
Reproductive Cycle ◽  
Southern Chile ◽  
Southern Brazil ◽  
Southwest Atlantic ◽  
Aggregate Distribution ◽  
Northern Patagonia ◽  
Southeast Pacific ◽  
Discopyge Tschudii

The Electric ray Discopyge tschudii is distributed in the Southwest Atlantic from southern Brazil to southern Argentina and in the Southeast Pacific from Peru to southern Chile. The main threat to this species is fishing. Discopyge tschudii is noncommercial and individuals caught are discarded on board. The present study analyzes the distribution and the morphological and reproductive characteristics of this ray in San Matías Gulf (SMG), Argentina. A total of 1087 individuals were analyzed. The species presented an aggregate distribution, with the main concentrations in the northern and eastern areas of SMG, at depths below 100 m. Males ranged from 9 to 43 cm and females from 11 to 38 cm. The species presented sexual dimorphism. Males were larger and heavier than females and also matured at larger sizes. Size at 50% of maturity was estimated at 30 cm for males and 21 cm for females. A total of 199 embryos were sampled and the proportion of sexes showed no significant differences from the expected 1:1. The number of embryos per female varied from 1 to 12. The most frequent values were 2 and 5. Length at birth was estimated at 82.17 ± 3.87 mm. Based on our findings, we hypothesize that the electric ray D. tschudii completes its reproductive cycle in SMG.

scholarly journals Dynamic of decapod crustacean larvae on the entrance of Guanabara bay

2002 ◽  
Vol 45 (4) ◽  
pp. 491-498 ◽  
Author(s):  
Lohengrin Dias de Almeida Fernandes ◽  
Sérgio Luiz Costa Bonecker ◽  
Jean Louis Valentin
Keyword(s):  
Reproductive Cycle ◽  
Seasonal Variations ◽  
Coastal Waters ◽  
Decapod Crustacean ◽  
Late Summer ◽  
Late Winter ◽  
Guanabara Bay ◽  
Tidal Cycles ◽  
Decapod Larvae

In the present study, we observed seasonal variations in the density of decapod larvae as well as changes in density related to diurnal and tidal cycles. Among the decapod larvae collected, portunids and grapsids were the most abundant, especially during nocturnal ebb tides and near the surface. The same results were obtained in late winter (September) and late summer (March). These results demonstrated a flow of decapod larvae from Guanabara Bay to adjacent coastal waters. Luciferid (Lucifer faxoni) was the only group with high densities during flood tides and we suggest this is an evidence of L. faxoni larvae entering Guanabara Bay in late winter. Probably these changes in distribution of Lucifer faxoni among winter and summer were related to reproductive cycle in the bay. For the portunids, grapsids and ocypodids, a similar dispersion strategy was observed towards adjacent coastal waters in the surface during nocturnal ebb tides.

Reproduction of the water snake Helicops infrataeniatus (Colubridae) in southern Brazil

2005 ◽  
Vol 26 (4) ◽  
pp. 527-533 ◽  
Author(s):  
Luís Felipe Schmidt de Aguiar ◽  
Marcos Di-Bernardo
Keyword(s):  
Sexual Dimorphism ◽  
Reproductive Cycle ◽  
Sexual Maturity ◽  
Statistical Difference ◽  
Rio Grande ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Water Snake ◽  
Males And Females ◽  
Two Peaks

AbstractThe reproductive cycle, sexual maturity, fecundity, and sexual dimorphism of Helicops infrataeniatus Jan, 1865, were inferred from the analysis of 374 preserved specimens (110 males, 140 females) from the eastern Central Depression of Rio Grande do Sul, Brazil. There was no statistical difference between the SVL of newborn males and females, but mature females attained greater length than mature males. The tail of mature individuals was proportionally longer in males than in females. Males matured at a smaller size than females. The reproductive cycle of this species was longer than what is known for oviparous colubrids from subtropical and temperate zones of Brazil. In the studied population, vitellogenesis occurred from September to February. Oviductal embryos were found from September to May. Births took place in September, January, February and March, and occurred in two peaks. Litter size ranged from 5 to 22 offspring. The differences between the number of vitellogenic follicles and embryos, and between embryos and newborns were not significant, thus practically all follicles were generally converted into embryos and embryos into newborns.

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