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

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

scholarly journals Additional Notes on the Reproduction of the Formosan Grass Lizard, Takydromus formosanus (Boulenger, 1894) (Squamata: Lacertidae), from Southwestern Taiwan

2016 ◽  
Vol 23 (1) ◽  
pp. 28-31
Author(s):  
Gerrut Norval ◽  
Jean-Jay Mao ◽  
Stephen R. Goldberg ◽  
Shao-Chang Huang
Keyword(s):  
Histological Examination ◽  
Reproductive Biology ◽  
Reproductive Cycle ◽  
Ad Hoc ◽  
Areca Catechu ◽  
Southwestern Taiwan ◽  
Female Reproductive Cycle

We collected 13 (male = 2; female = 10; juvenile = 1) Takydromus formosanus on an ad hoc basis from a Betelnut Palm (Areca catechu) plantation in Santzepu, Sheishan District, Chiayi County, as part of a herpetofaunal survey of the area. The smallest reproductively active female had a snout-vent length (SVL) of 44mm, and the smallest male with an enlarged tail base had a SVL of 41 mm. A histological examination and oviposition indicated that the female reproductive cycle commences in April and lasts until at least June. We recorded no clutch sizes greater than two eggs. Takydromus formosanus is a poorly studied species, and many aspects of the reproductive biology of this species merit further research.

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.

The Female Reproductive Cycle of the Indian Monitor Lizard, Varanus monitor

Copeia ◽  
1976 ◽  
Vol 1976 (2) ◽  
pp. 256 ◽  
Author(s):  
Dennis Jacob ◽  
L. S. Ramaswami
Keyword(s):  
Reproductive Cycle ◽  
Monitor Lizard ◽  
Female Reproductive Cycle

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
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