Reproductive biology of Philodryas patagoniensis (Snakes: Dipsadidae) in south Brazil: male reproductive cycle

2016 ◽  
Vol 98 (4) ◽  
pp. 329-339 ◽  
Author(s):  
Luiza Loebens ◽  
Sonia Zanini Cechin ◽  
Tiago Felipe Theis ◽  
Livia Bataioli Moura ◽  
Selma Maria Almeida-Santos
Keyword(s):  
Reproductive Biology ◽  
Reproductive Cycle ◽  
South Brazil

Reproductive biology ofPhilodryas patagoniensis(Snakes: Dipsadidae) in south Brazil: Female reproductive cycle

2017 ◽  
Vol 99 (2) ◽  
pp. 105-114 ◽  
Author(s):  
Luiza Loebens ◽  
Claudio Augusto Rojas ◽  
Selma Maria Almeida-Santos ◽  
Sonia Zanini Cechin
Keyword(s):  
Reproductive Biology ◽  
Reproductive Cycle ◽  
South Brazil ◽  
Female Reproductive Cycle

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 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.

Reproductive cycle, sexual maturity and longevity of Odontophrynus americanus (Anura: Odontophrynidae) in South Brazil

2020 ◽  
Author(s):  
Amanda J.C. Brum ◽  
Luiza Loebens ◽  
Cynthia P. A. Prado ◽  
Sonia Z. Cechin
Keyword(s):  
Reproductive Cycle ◽  
Sexual Maturity ◽  
South Brazil

Reproductive biology of the holothurian Holothuria forskali (Echinodermata)

1992 ◽  
Vol 72 (4) ◽  
pp. 745-758 ◽  
Author(s):  
Ambo Tuwo ◽  
Chantal Conand
Keyword(s):  
Reproductive Biology ◽  
Reproductive Cycle ◽  
Reproductive Effort ◽  
Rest Period ◽  
Common Species ◽  
Oocyte Size ◽  
Spawning Period ◽  
The Mediterranean ◽  
Very High

The aspidochirote Holothuria forskali is a large common species found in the Atlantic and the Mediterranean. Its reproductive cycle has been determined in a population from Brittany using histological observations of the different classes of gonadal tubules, oocyte size frequencies and evolution of gonad indices. The cycle is annual and synchronous in both sexes. The different phases are well marked and are characterized by a long maturation during summer and autumn followed by a pre-spawning period during winter. Spawning is probably related to the increase in temperature. Most of the mature gametes are released. The resorption of the relict and spent tubules continues during the onset of the next vitellogenesis in the secondary tubules, without a rest period. The reproductive effort, documented from the gonad indices, is very high in this population which is composed of adult individuals.

Migration and reproductive biology of Mugil liza (Teleostei: Mugilidae) in south Brazil

2014 ◽  
Vol 85 (3) ◽  
pp. 671-687 ◽  
Author(s):  
V. M. Lemos ◽  
A. S. Varela ◽  
P. R. Schwingel ◽  
J. H. Muelbert ◽  
J. P. Vieira
Keyword(s):  
Reproductive Biology ◽  
South Brazil

Observations on the biology of the common torpedo (Torpedo torpedo, Linnaeus, 1758) and marbled electric ray (Torpedo marmorata, Risso, 1810) from Egyptian Mediterranean waters

1994 ◽  
Vol 45 (4) ◽  
pp. 693 ◽  
Author(s):  
SH Abdel-Aziz
Keyword(s):  
Reproductive Biology ◽  
Breeding Season ◽  
Reproductive Cycle ◽  
Strong Correlation ◽  
Maximum Size ◽  
Size At Maturity ◽  
Torpedo Marmorata ◽  
Food Items ◽  
The Common ◽  
Males And Females

The reproductive biology and diets of Torpedo torpedo and T. marmorata from Egyptian Mediterranean waters are described. Males and females reached a maximum size of 39.1 and 40.8 cm total length (TL), respectively, in T. torpedo and 38.6 and 61.2 cm TL, respectively, in T. marmorata. The size at maturity of males of T. torpedo and T. marmorata is 18 and 25.5 cm TL, respectively, and of females, is 22 and 35.5 cm TL, respectively. Both species exhibit aplacental viviparity. T. torpedo has a restricted breeding season, and individual females appear to breed annually, whereas T. marmorata females appear to have a more extended reproductive cycle (probably breeding every two years). In both species, males are capable of mating every year. In T. torpedo, mating occurs between December and February, ovulation in March-April, and parturition in late August and September after five to six months of gestation. Individuals of T. marmorata mate between November and January, ovulate between December and February, and give birth the following December after 10-12 months of gestation. Mean embryos sizes are 7.3 cm TL (range 4.6-8.2 cm TL) for T. torpedo and 8.5 cm TL (range 5.8-10.1 cm TL) for T. marmorata. Observations in Egyptian Mediterranean waters show a strong correlation between ovarian and uterine fecundity and the length of the mother in both species. Fish are an important component of the diet of the two species, as, to a lesser extent, are crustaceans for T. torpedo and cephalopods for T. marmorata. Juveniles eat a wide variety of food items, whereas adults feed only on fish.

scholarly journals REPRODUCTIVE CYCLE OF Leporinus copelandii (Pisces: Anostomidae) FEMALES FROM THE LOWER PARAÍBA DO SUL RIVER BASIN, RJ – BRAZIL

2015 ◽  
Vol 6 (2) ◽  
pp. 116
Author(s):  
Ana Paula Ribeiro Costa Erthal ◽  
Dalcio Ricardo Andrade ◽  
Marcella Costa Radael ◽  
Milton Erthal Junior ◽  
Eduardo Shimoda
Keyword(s):  
At Risk ◽  
River Basin ◽  
Reproductive Biology ◽  
Reproductive Cycle ◽  
Histological Study ◽  
Oocyte Development ◽  
Type Iv ◽  
Risk Of Extinction ◽  
Medium Diameter ◽  
Paraíba Do Sul River

The aim of this study were investigate the reproductive biology of the fish <em>Leporinus copelandii</em>, a specie at risk of extinction in the lower Paraíba do Sul River basin. During a period of 14 months, a total of 143 females of red-piau were captured, between Itaocara and Campos dos Goytacazes cities (RJ, Brazil). A histological study shows four stages of the oocyte development (I, II, III and IV) and five stages of the reproductive cycle of females: rest (1), initial maturation (2A), intermediary (2B), advanced (2C) and spawned (4) were identified. The pattern of <em>L. copelandii</em> oocyte development suggests development type synchronous in two groups, characterizing total spawning. Spawned females were captured in November, two months after the peak of frequency of competent females for reproduction. Histologically, a little occurrence of empty follicles was observed in spawned females. The medium diameter of the type IV oocyte of the spawned females (1475.1 ± 884.3mm) was significantly larger (Tukey, P &lt;0.001; VC = 41.73%; n = 259) than advanced maturation females (1202.6 ± 245.3mm), what allows suggesting that the study place probably doesn't represent the reproductive area of <em>L. copelandii</em>.

Reproductive biology of the Sword Snake Tomodon dorsatus (Serpentes: Dipsadidae) in South Brazil: comparisons within the tribe Tachymenini

2020 ◽  
Vol 41 (4) ◽  
pp. 445-459
Author(s):  
Luiza Loebens ◽  
Selma Maria Almeida-Santos ◽  
Sonia Zanini Cechin
Keyword(s):  
Reproductive Cycle ◽  
Reproductive Strategies ◽  
Sexual Maturity ◽  
Reproductive Effort ◽  
Caudal Vertebra ◽  
Ductus Deferens ◽  
Histological Changes ◽  
Males And Females ◽  
Autumn And Winter ◽  
South Brazil

Abstract We described the reproductive cycle, size-fecundity relationships, reproductive effort, and sexual maturity of Tomodon dorsatus in South Brazil. We examined 87 individuals (25 males and 62 females) from herpetological collections. The description of the reproductive cycle was based on the morpho-anatomical and histological changes in male testes, ductus deferens, and kidney and in female ovary and oviduct. The age at the onset of sexual maturity was estimated by skeletochronology of the caudal vertebra. The reproduction is seasonal semi-synchronous with most of the individuals showing a reproductive peak in the spring. Males and females have developed sperm storage strategies, increasing the reproductive success. Males store sperm in the ductus deferens during the autumn and winter, while females storage takes place in the utero-vaginal junction furrows during the autumn and early winter. Larger females produce a higher number of larger follicles and eggs. Females invest more in growth before reaching sexual maturity than males. Females reach sexual maturity earlier (4 years old) than males (5 years old) and have larger bodies but lower longevity. Reproductive strategies of Tachymenini specie are highly conserved.

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