Sexual Dimorphism and Female Reproduction in a Viviparous Snake, Elaphe rufodorsata

1997 ◽  
Vol 31 (3) ◽  
pp. 420 ◽  
Author(s):  
Xiang Ji ◽  
Yue-Ying Xie ◽  
Ping-Yue Sun ◽  
Xiang-Zhong Zheng
Keyword(s):  
Sexual Dimorphism ◽  
Female Reproduction

scholarly journals Body size, female reproduction and sexual dimorphism in the lizard Ameiva ameiva (Teiidae) in a restinga of southeastern Brazil

2008 ◽  
Vol 25 (2) ◽  
pp. 370-372 ◽  
Author(s):  
Carlos Frederico Duarte Rocha
Keyword(s):  
Body Size ◽  
Sexual Dimorphism ◽  
Clutch Size ◽  
Reproductive Period ◽  
Southeastern Brazil ◽  
Head Width ◽  
Sexually Dimorphic ◽  
Female Reproduction ◽  
Female Body Size ◽  
Reproductive Body

In this study 57 specimens of the lizard Ameiva ameiva (Linnaeus, 1758) collected in the restinga at Barra de Maricá, in the state of Rio de Janeiro, southeastern Brazil, were analyzed to investigate size relations and reproduction (in females) and sexual dimorphism of this population. We answered the following questions: 1) what is the minimum reproductive body size in females? 2) what is the average clutch size and 3) how is clutch size related to body size? 4) Are body and head sizes sexually dimorphic? Mean clutch size was 6.7 ± 2.1 eggs and was positively correlated with female body size. Sexual dimorphism favoring males was found: adult mean snout-vent length was great in males (124.2 ± 17.8 mm) than females (96.5 ± 23.1 mm SVL), and males were larger with respect to head width and length, and body mass. Thus, despite the marked seasonality at Barra de Maricá, A. ameiva has an extended reproductive period. Also, intrasexual selection may have acted on females to produce larger clutches, and on males, favoring larger males.

Sexual dimorphism and female reproduction in two sympatric toad-headed lizards, Phrynocephalus frontalis and P. versicolor (Agamidae)

2011 ◽  
Vol 61 (2) ◽  
pp. 139-151 ◽  
Author(s):  
Lu-Xi Mao ◽  
Jian-Fang Gao ◽  
Xiang Ji ◽  
Yan-Fu Qu
Keyword(s):  
Sexual Dimorphism ◽  
Egg Size ◽  
Species Difference ◽  
Tail Length ◽  
Reproductive Traits ◽  
Sympatric Species ◽  
Offspring Size ◽  
Head Width ◽  
Female Reproduction ◽  
Female Reproductive Traits

AbstractWe studied sexual dimorphism and female reproduction in two sympatric species of toad-headed lizards, Phrynocephalus frontalis and P. versicolor, from Inner Mongolia, North China. The smallest reproductive females of P. frontalis and P. versicolor we recorded were 43.5 mm and 44.2 mm SVL, respectively. Females were the larger sex in P. versicolor, whereas female and male adults of P. frontalis did not differ in mean SVL. Females of P. frontalis were on average smaller than females of P. versicolor, so were males of P. frontalis. In both species females were larger in abdomen length (AL) but smaller in head length (HL), head width (HW) and tail length (TL); adults of P. frontalis were larger in HL and TL but smaller in AL and HW than adults of P. versicolor of the same size. Females of both species laid a single clutch of 2-6 eggs per breeding season. The trade-off between size and number of eggs was evident in both species. Of the examined female reproductive traits, only clutch size and egg size differed between the two species, with females of P. frontalis laying fewer but larger eggs than did females of P. versicolor of the same SVL. However, as the observed between-species difference in egg size (and thus, offspring size) was small, any niche divergence resulting from this difference could be less important in reducing competitions between these two sympatric species of lizards.

Sexual Dimorphism and Female Reproduction in the Many-Lined Sun Skink (Mabuya multifasciata) from China

2006 ◽  
Vol 40 (3) ◽  
pp. 351-357 ◽  
Author(s):  
Xiang Ji ◽  
Long-Hui Lin ◽  
Chi-Xian Lin ◽  
Qing-Bo Qiu ◽  
Yu Du
Keyword(s):  
Sexual Dimorphism ◽  
Female Reproduction ◽  
The Many

RHYNCHOLITES AND THE PROBLEM OF NARROW AND BROAD CONCEPTION OF TAXONS

2018 ◽  
pp. 12-17 ◽  
Author(s):  
I. R. Khuzina ◽  
V. N. Komarov
Keyword(s):  
Sexual Dimorphism ◽  
Morphological Characteristics ◽  
Mass Scale ◽  
Individual Variability ◽  
Point Of View ◽  
The Other ◽  
New Taxon ◽  
Artificial System ◽  
Broad Understanding

The paper considers a point of view, based on the conception of the broad understanding of taxons. According to this point of view, rhyncholites of the subgenus Dentatobeccus and Microbeccus are accepted to be synonymous with the genus Rhynchoteuthis, and subgenus Romanovichella is considered to be synonymous with the genus Palaeoteuthis. The criteria, exercising influence on the different approaches to the classification of rhyncholites, have been analyzed (such as age and individual variability, sexual dimorphism, pathological and teratological features, degree of disintegration of material), underestimation of which can lead to inaccuracy. Divestment of the subgenuses Dentatobeccus, Microbeccus and Romanovichella, possessing very bright morphological characteristics, to have an independent status and denomination to their synonyms, has been noted to be unjustified. An artificial system (any suggested variant) with all its minuses is a single probable system for rhyncholites. The main criteria, minimizing its negative sides and proving the separation of the new taxon, is an available mass-scale material. The narrow understanding of the genus, used in sensible limits, has been underlined to simplify the problem of the passing the view about the genus to the other investigators and recognition of rhyncholites for the practical tasks.

Observation on the breeding biology of Polypedates teraiensis (Dubois, 1987) (Amphibia: Rhacophoridae)

2017 ◽  
Vol 17 (1) ◽  
pp. 25-32
Author(s):  
Jacinta Lalchhanhimi ◽  
Lalremsanga H.T.
Keyword(s):  
Sexual Dimorphism ◽  
Breeding Season ◽  
Sound Production ◽  
Reproductive Function ◽  
Breeding Biology ◽  
Tree Frog ◽  
University Campus ◽  
Morphometric Measurements ◽  
Advertisement Calls ◽  
Males And Females

The breeding biology of tree frog, Polypedates teraiensis was studied during the breeding season at Mizoram University Campus. It was found that sound production by male during the breeding season was primarily a reproductive function and advertisement calls attract females to the breeding areas and announce other males that a given territory is occupied. The aim of this study was to provide the detailed information on the breeding behaviour and the advertisement calls of Polypedates teraiensis. The morphometric measurements of the amplecting pairs (males and females) for sexual dimorphism along with clutch sizes were also studied.

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