ISSN 1003-8280 CN 10-1522/R 中国疾病预防控制中心 主办
Chinese Journal of Vector Biology and Control >
Analysis of annual horse gastrointestinal myiasis occurrence in wild and captive populations of Equus przewalskii
Received date: 2016-01-06
Online published: 2016-06-20
Supported by
Supported by the Innovative Talents of Elementary Education in Beijing (No. 2015HXFWBHQ), the Program for New Century Excellent Talents in University of Ministry of Education of China (No. NCET-12-0783), the Fundamental Research Funds for the Central Universities (No. JC2015-04) and the Project of Department for Wildlife and Forest Plants Protection, SFA of China (No. 2015-123)
Objective A parasitological survey was conducted in wild and captive populations of Equus przewalskii with treatment of antiparasitics to investigate the infection, diversity and parasitic characteristics of Gasterophilus spp. in E. przewalskii which lives in different conditions. Methods Gasterophilus spp. larvae were collected and counted from the random fecal samples of E. przewalskii populations and all the fecal samples of E. przewalskii individuals after antiparasitic treatment in January 2015. Results There was a statistically significant difference in the mean number of Gasterophilus spp. larvae at the peak of larvae expelled between wild and captive populations (140.8±62.8 and 1.8±0.9, respectively) (u=-4.997, P=0.000). Larval burdens of captive population were reduced by establishing isolated zone and providing special forage grasses. A total of 5 357 larvae were collected from wild population, which were identified as the following 5 species of Gasterophilus spp.: G. pecorum, G. nasalis, G. nigricornis, G. intestinalis and G. haemorrhoidalis. Gasterophilus pecorum (96.84%) was the predominant species in the wild population. In total 83 larvae were collected from captive population, and 5 species of Gasterophilus spp. were identified as follows: G. intestinalis, G. haemorrhoidalis, G. nasalis, G. nigricornis, and G. inermis. The prevailing species were G. intestinalis (48.19%) and G. haemorrhoidalis (39.76%). There was an obvious difference between wild and captive population in species composition of Gasterophilus. Shannon-Wiener index of Gasterophilus spp. was 1.07 in the captive population, significantly higher than the wild one(0.17). The evenness index of Gasterophilus spp. was higher in the captive population (0.66) similarly, while it was 0.10 in the wild population. The results shown a striking difference of Gasterophilus spp. diversity between wild and captive populations, while the latter was rigorous infected by horse gastrointestinal myiasis. Gasterophilus pecorum was the predominant species in the wild population while it was absent in the captive population, which indicated that unique transmission cycle with grass was intyerrupted. Conclusion Equus przewalskii populations in different living environments have distinctly different infective charsacteristics of Gasterophilus spp., G. pecorum has extremely strong adaptability to the desert steppe.
ZHANG Bo-ru, ZHANG Xiao-yu, ZHANG Ling, HE Lei, WANG Chen, WANG Zhen-shan, ZHANG Dong, LI Kai . Analysis of annual horse gastrointestinal myiasis occurrence in wild and captive populations of Equus przewalskii[J]. Chinese Journal of Vector Biology and Control, 2016 , 27(3) : 244 -247 . DOI: 10.11853/j.issn.1003.8280.2016.03.008
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