Sexual dimorphism, female reproduction and egg incubation in the oriental leaf-toed gecko (Hemidactylus bowringii) from southern China

Zoology ◽  
2007 ◽  
Vol 110 (1) ◽  
pp. 20-27 ◽  
Author(s):  
Da-De Xu ◽  
Xiang Ji
Keyword(s):  
Sexual Dimorphism ◽  
Southern China ◽  
Female Reproduction ◽  
Egg Incubation

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

Phylogenetic analysis and osteological comparison of the cave-dwelling spined loach, Bibarba parvoculus (Cypriniformes: Cobitidae), and its surface congener

2020 ◽  
Author(s):  
You He ◽  
Yongxia Chen ◽  
Jian Yang ◽  
Lawrence M Page
Keyword(s):  
Phylogenetic Analysis ◽  
Sexual Dimorphism ◽  
Southern China ◽  
Anterior Part ◽  
Frontal Bone ◽  
Morphological Evidence ◽  
Karst Cave ◽  
Spined Loach ◽  
X Ray ◽  
Orbital Region

Abstract Bibarba parvoculus, a depigmented and small-eyed, spined loach, is endemic to a karst cave in southern China. Both mitochondrial Cytb and nuclear RAG1 gene analyses indicate that B. parvoculus and its only surface congener, B. bibarba, form the basal-most lineage in the so-called Northern Clade of Cobitidae. Genetic divergence for Cytb is 10.3 % between B. parvoculus and B. bibarba. A duplication of the lamina circularis on the second and third pectoral rays occurs in male Bibarba species. The osteology of the two species is illustrated and compared using X-ray microtomography. Bibarba parvoculus has higher vertebral counts, a broader anterior part of the frontal bone at the orbital region and decreased sexual dimorphism when compared with B. bibarba. The coracoid, mesocoracoid and scapula are stouter in males of both species, but the three bones are autogenous in B. parvoculus, while fused with the cleithrum in B. bibarba. Specific differentiation of B. parvoculus is corroborated by both molecular and morphological evidence. The split between the two species is estimated to have occurred in the Early Miocene.

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

One new and four newly recorded species of the genus Macrobrachium (Decapoda: Caridea: Palaemoindae) from Guangdong Province, southern China

Zootaxa ◽  
2008 ◽  
Vol 1961 (1) ◽  
pp. 11-25 ◽  
Author(s):  
ZHAO-LIANG GUO ◽  
SHUN-LIAN HE
Keyword(s):  
New Species ◽  
Sexual Dimorphism ◽  
New Records ◽  
Southern China ◽  
Guangdong Province ◽  
Proximal Part ◽  
Cutting Edge ◽  
Undescribed Species ◽  
Ecological Survey

The present study, based on a faunistic and ecological survey of the genus Macrobrachium from Guangdong Province, expands the knowledge of morphology, coloration, and distribution of an undescribed species and four new records for M. formosense Bate, 1868, M. inflatum Liang & Yan, 1985, M. maculatum Liang & Yan, 1980 and M. meridionalis Liang & Yan, 1983. A more complete diagnosis of these five species is presented. Macrobrachium heterorhynchos, new species, can be distinguished from its congeners by a combination of characters which includes rostral sexual dimorphism, the two teeth at the proximal part of the cutting edge of the fixed finger of the second pereiopod, the non-inflated palm, and the distinctly longer merus compared which is distinctly longer than the palm or the ischium.

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