Journal of Guangxi Normal University(Natural Science Edition) ›› 2021, Vol. 39 ›› Issue (1): 79-86.doi: 10.16088/j.issn.1001-6600.2020031004

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Comparison of Swimming Ability between Wild and Captive Breeding Shinisaurus crocodilurus

CHENG Rui1,2, HE Mingxian1,2, ZHONG Chunying1,2, LUO Shuyi3, WU Zhengjun1,2*   

  1. 1. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin Guangxi 541006, China;
    2. Guangxi Key Laboratory of Rare and Endangered Animal Ecology (Guangxi Normal University), Guilin Guangxi 541006, China;
    3. Guangxi Daguishan Crocodile National Nature Reserve, Hezhou Guangxi 542824, China
  • Received:2020-03-10 Revised:2020-04-06 Online:2021-01-25 Published:2021-03-27

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Abstract: The experimental animals were 57 captive breeding adults Shinisaurus crocodilurus and 35 wild adult S. crocodilurus in Daguishan Nature Reserve,Guangxi,China. These individuals were divided into captive breeding adult male group,captive breeding non-pregnant adult female group,wild adult male group and wild adult non-pregnant adult female group. The swimming abilities of S. crocodilurus (sprint swimming speed and maximum distance of continuous movement) were measured at the ambient temperature of 26 ℃ and the water temperature of 26 ℃. Two-way analysis of variance showed that: There was no gender difference in swimming abilities of S. crocodilurus (all P>0.05); however the sprint swimming speed of wild S. crocodilurus (0.67±0.12 m/s) was significantly higher than that of captive breeding S. crocodilurus (0.51±0.10m/s) (F1,88=48.941,P <0.001); there was no significant difference in the maximum distance of continuous movement(F1,88=0.594,P=0.443). The interaction of sex and grouping (captive breeding and wild S. crocodilurus) had no significant effect on the swimming abilities of S. crocodilurus (all P > 0.05). According to the correlation analysis: The body weight,abdomen length,snout-vent length,tail height,and femur length were extremely significant correlated with its sprint swimming speed (all P <0.01); the fat fullness,tail circumference and tail volume were significantly correlated with its sprint swimming speed (all P <0.05); the snout-vent length,body weight and tail height were extremely significant correlation to its maximum distance of continuous movement (all P <0.01); the tail circumference,tail volume,and fat fullness were significantly related to its maximum distance of continuous movement (all P <0.05). The results of stepwise regression analysis showed that femoral length and tail volume were the main factors that affecting the sprint swimming speed (P <0.001). The tail height was the main factor affecting the maximum distance of continuous movement (P =0.003). The results showed that captive breeding condition will lead to decline in the swimming abilities of S. crocodilurus. In order to keep wild released individual with enough movement ability,artificial training is necessary to strengthen movement ability of captive breeding S. crocodilurus.

Key words: Shinisaurus crocodilurus, wild, captive breeding, fat fullness, sprint swimming speed, maximum distance of continuous movement

CLC Number: 

  • Q958.1
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[1] HE Mingxian, XU Shulin, LI Shilin, LUO Shuyi, YANG Chunsheng,CHENG Rui, WU Zhengjun. Correlation between Locomotor Performance and Body Measurements of Captive Breeding Shinisaurus crocodilurus [J]. Journal of Guangxi Normal University(Natural Science Edition), 2020, 38(1): 120-126.
[2] XIE Hai，CHEN Liang，HUANG Haiyan，HE Nan，LIU Haiyang，WU Zhengjun. Research on Movement Pattern and the Influencing Factors of Shinisaurus crocodilurus in the Luokeng Nature Reserve， Guangdong, China [J]. Journal of Guangxi Normal University(Natural Science Edition), 2017, 35(4): 106-113.
[3] HUANG Hua-yuan, LIU Hai-yang, HE Nan, WU Zheng-jun. Preliminary Noninvasive Analysis of Fecal Hormone in the Chinese Crocodile Lizard (Shinisaurus crocodilurus Ahl) [J]. Journal of Guangxi Normal University(Natural Science Edition), 2014, 32(4): 115-119.
[4] WU Zheng-jun, WANG Zhen-xing, LIU Hai-yang, HE Nan, YU Hai, HUANG Cheng-ming. Thermal Dependence of Locomotor Performance for Shinisaurus crocodilurus in the Luokeng Nature Reserve,Guangdong,China [J]. Journal of Guangxi Normal University(Natural Science Edition), 2012, 30(3): 276-281.
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