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The Effects of Prey Items Diversity and Digestible Materials in Stomach on Digestive Tract Length in hylarana guentheri

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Asian Herpetological Research 2020年第2期11卷 155-160页

作者： Lin CAI Jianping YU Chunlan MAI Wenbo LIAO Clinical Medicine Department of TCM and Western Medicine North Sichuan Medical CollegeNanchong 637000SichuanChina Key Laboratory of Southwest China Wildlife Resources Conservation(Ministry of Education) China West Normal UniversityNanchong 637009SichuanChina Key Laboratory of Artificial Propagation and Utilization in Anurans of Nanchong City China West Normal UniversityNanchong 637009SichuanChina Institute of Eco-adaptation in Amphibians and Reptiles China West Normal UniversityNanchong 637009SichuanChina

Difference in environmental condition shapes variation in digestive tract length in evolutionary process.In particular,environmental difference results in variation in food resource among different habitats,and thereby affecting energy intake and energy allocation.The digestive theory predicts that animals foraging high indigestible materials of stomach contents can promote the increased gut dimensions.Here,we studied variation in digestive tract and gut length across six hylarana guentheri populations at different altitudes and latitudes to test the prediction of the digestive theory.We found that altitude and latitude did not affect variation in relative size of digestive tract and gut among populations.We also found that relative size of digestive tract and gut did not be correlated with diversity of prey items,but negatively correlated with proportion of digestible materials.Our findings suggest that individuals foraging less digestible materials display relatively longer digestive tract than individuals foraging more digestible materials.

关键词： altitude digestive tract digestible materials diversity of prey items hylarana guentheri

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Asymmetry of Testes in Guenther's Frog,hylarana guentheri(Anuar:Ranidae)

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Asian Herpetological Research 2011年第4期2卷 234-239页

作者： Yanhong LIU Wenbo LIAO Caiquan ZHOU Zhiping MI Min MAO Key Laboratory of Southwest China Wildlife Resources Conservation of Ministry of Education China West Normal University Institute of Rare Animals and Plants China West Normal University

Testes size in most animals commonly shows directional asymmetry. In birds, the left testis mass is usually larger than the right one, but the reports on the testes asymmetry in anurans are very few. Moller （1994） hypothesized that the right testis serves a compensatory role and increases in size when the left one is defective, and further suggested that testes asymmetry may be a reliable indicator of individual body condition. In this paper, we tested the compensation hypothesis in the Guenther＇s frog, hylarana guentheri. From 60 sampled males, we found that there was a significant directional asymmetry in testes mass, with the left testis size being significantly correlated with relative testes asymmetry, providing evidence that the right testis had a compensatory function. However, testes mass and asymmetry were not correlated with body condition. Hence, we found no evidence that testes asymmetry in the Guenther＇s frog reflected male condition, and male age was also not related to testes mass or asymmetry.

关键词： directional testes asymmetry compensation hypothesis body condition hylarana guentheri

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