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Differences in incubation length and Hatchling Morphology among Five Species of Oviparous Phrynocephalus Lizards (Agamidae) from China

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Asian Herpetological Research 2013年第4期4卷 225-232页

作者： Zheng WANG Li MA Min SHAO Xiang JI College of Forest Resources and Environment Nanjing Forestry University Jiangsu Key Laboratory for Biodiversity and Biotechnology College of Life Sciences Nanjing Normal University Hangzhou Key Laboratory for Animal Adaptation and Evolution School of Life Sciences Hangzhou Normal University

We incubated eggs of five Phrynocephalus species （P. albolineatus, P. axillaries, P. grumgrzimailoi, P. helioscopus and P. przewalskii） at three constant temperatures （24℃, 28℃ and 32℃） to examine differences in incubation length and hatchling morphology among species and among temperature treatments. We combined data from this study with those reported previously for P. frontalis and P. versicolor to examine whether embryonic stage at laying is a causal factor for interspecific variation in incubation length, and whether the phylogenetic relationship inferred from hatchling morphology is consistent with the relationship based on mitochondrial DNA data. Mean values for incubation length differed among the five species studied herein and, in all these five species, incubation length decreased at a decreasing rate as temperature increased. In none of the five species did hatchling size （snout-vent length and body mass） and other morphological variables differ among the three temperature treatments. The seven oviparous Phrynocephalus lizards found in China differ from each other in hatchling morphology, and embryonic stage at laying is a causal factor of inter- and intra-specific variation in incubation length. The phylogenetic relationship inferred from hatchling morphology is not always consistent with the currently known relationship based on mitochondrial DNA data. Data from this study and those reported previously allow the conclusion that any Phrynocephalus species may have its unique position along the axis defined by hatchling morphology.

关键词： Agamidae Phrynocephalus lizards oviparous species egg incubation incubation length hatchling morphology

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维普期刊数据库

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Sexual Dimorphism,Female Reproductive Characteristics and Embryonic Thermosensitivity in the Tonkin Forest Skink(Sphenomorphus tonkinensis)from Hainan,South China

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Asian Herpetological Research 2023年第4期14卷 271-279页

作者： Yu DU Chixian LIN Xiaming ZHU Yuntao YAO Xiang JI Hainan Key Laboratory for Herpetological Research College of Fisheries and Life SciencesHainan Tropical Ocean UniversitySanya 572022HainanChina Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection College of Life and Environmental SciencesWenzhou UniversityWenzhou 325035ZhejiangChina

We collected 75 adult Tonkin forest skinks(Sphenomorphus tonkinensis) from Hainan, South China and incubated eggs at four constant temperatures ranging from 22 ℃ to 28 ℃ to study sexual dimorphism, female reproductive characteristics and embryonic thermosensitivity. The largest male was 53.4 mm snout-vent length(SVL), and the largest female was 54.3 mm SVL. The mean SVL was slightly greater in adult females(49.9 mm) than in adult males(48.8 mm), but the difference was not *** length, head width, fore-limb length and hindlimb length were longer in adult males and abdomen length was longer in adult females after accounting for SVL. Accordingly, we conclude that S. tonkinensis is basically a sexually size-monomorphic species with sexual dimorphism in head size, abdomen(trunk)length and limb size. Females laid up to two clutches of 1–4 eggs each per egg-laying season from February to May. Egg mass, clutch size and clutch mass were independent of female SVL. Embryonic stages at laying varied from Dufaure and Hubert’s stage 30 to 31. With female SVL held constant, the negative correlation between egg mass and clutch size was not significant, suggesting that the offspring(egg) sizenumber trade-off between is not evident or eggs are well optimized for size in S. tonkinensis. None of the eggs at 28 ℃ hatched;hatching success was lower at 22 ℃ than at 24 ℃ or 26 ℃. The mean incubation length was 52.9 d at 22 ℃, 40.4 d at 24 ℃ and 33.6 d at 26 ℃. Hatchlings from eggs incubated at 22 ℃,24 ℃ and 26 ℃ did not differ morphologically at hatching, suggesting that temperatures within this range do not differentially affect hatchling morphology in S. tonkinensis.

关键词： egg hatching success hatchling morphology incubation length reproduction Scincidae sexual dimorphism

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Sexual Dimorphism, Female Reproductive Characteristics and Egg incubation in an Oviparous Forest Skink(Sphenomorphus incognitus) from South China

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Asian Herpetological Research 2018年第2期9卷 119-128页

作者： Li MA Jianchi PEI Cuntong ZHOU Yu DU Xiang JI Wen SHEN School of Sports and Health Hangzhou Normal University Jiangsu Key Laboratory for Biodiversity and Biotechnology College of Life Sciences Nanjing Normal University College of Ecology Lishui University Hainan Key Lab for Herpetology College of Tropical Biology and Agronomy Hainan Tropical Ocean University

We studied sexual dimorphism and female reproduction in an oviparous forest skink （Sphenomorphus incognitus） from South China. We incubated eggs under five thermal regimes （22, 25, 28, 25 ± 3 and 27± 5℃） to examine the effects of constant versus fluctuating temperatures on incubation length and hatchling morphology. In our sample the largest male and female were 110 mm and 108 mm snout-vent length （SVL）, respectively. Adult males and females did not differ in mean SVL; adult males were larger in head size （both length and width）, longer in fore- and hind-limb lengths and shorter in abdomen length than females of the same SVL. Accordingly, we conclude that S. incognitus is a sexually monomorphic species in terms of SVL but shows sexual dimorphism in head size, abdomen length and appendage length. Females laid a single clutch of 3-10 eggs per breeding season from early May to mid- August, with larger females generally laying more （but not always larger） eggs per clutch than did smaller ones. Embryonic stages at laying ranged from Dufaure and Hubert＇s （1961） stage 31 to 32, with a mean stage of 31.3. The positive relationship between clutch mass and female SVL was not significant. The offspring size-number trade-off does not exist in S, incognitus, as revealed by the fact that egg mass was independent of relative fecundity. incubation length decreased as temperature increased, and stable temperatures resulted in delayed hatching. Hatchlings incubated under the five thermal regimes did not differ from each other in any examined trait, suggesting that S. incognitus is among oviparous reptilian species where incubation temperature has no role in modifying hatchling morphology as long as eggs are not exposed to extreme temperatures for prolonged periods of time.

关键词： egg hatchling morphology incubation length reproduction Scincidae sexual dimorphism

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Fluctuations in incubation temperature affect incubation duration but not morphology,locomotion and growth of hatchlings in the sand lizard Lacerta agilis(Lacertidae)

Fluctuations in incubation temperature affect incubation dur...

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第七届全国野生动物生态与资源保护学术研讨会

作者： Hong Li,Zong-Shi Zhou,Guo-Hua Ding,Xiang Ji (Jiangsu Key Laboratory for Biodiversity and Biotechnology,College of Life Sciences,Nanjing Normal University,Nanjing 210046,Jiangsu,China)

Studies looking for potential effects of temperature and temperature fluctuations on phenotypic traits of reptile hatchlings have shown species variation,but have not always allowed a distinction between effects of fl... 详细信息

关键词： Lacertidae Lacerta agilis Thermal fluctuations incubation temperature phenotype of hatchlings incubation length Growth

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Does the variance of incubation temperatures constitute a selective force for the origin of reptilian viviparity?

Does the variance of incubation temperatures constitute a se...

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第七届全国野生动物生态与资源保护学术研讨会

作者： Hong Li,Zheng Wang,Ce Chen,Xiang Ji (Jiangsu Key Laboratory for Biodiversity and Biotechnology,College of Life Sciences,Nanjing Normal University,Nanjing 210046,Jiangsu,China)

It has been hypothesized that the variance of temperatures experienced during embryonic development may have constituted a significant selective force for the evolution of viviparity in *** test this idea,we incubated... 详细信息

关键词： Scincid lizard Developmental plasticity Viviparity Phenotype incubation length Thermal condition

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