兽类学报 ›› 2015, Vol. 35 ›› Issue (3): 312-320.

• 论文 • 上一篇    下一篇

艾美耳球虫对高原鼠兔繁殖的影响

杨彦宾 杜寅 曹伊凡 堵守阳 边疆晖   

  1. 中国科学院西北高原生物研究所,中国科学院高原生物适应与进化重点实验室
  • 出版日期:2015-08-13 发布日期:2015-11-15
  • 通讯作者: 边疆晖 E-mail: bjh@nwipb.ac.cn
  • 作者简介:杨彦宾(1987-),男,硕士研究生,主要从事动物生态学研究.
  • 基金资助:
    国家自然科学基金资助项目(30970463,31170394),青海省自然基金项目(2014-ZJ-913)

Effects of coccidian parasites (Apicomplexa:Eimeriiade)on reproduction in plateau pika

YANG Yanbin, DU Yin, CAO Yifan, DU Shouyang, BIAN Jianghui#br#   

  1. Northwest Institute of Plateau Biology, Key Laboratory of Adaptation and Evolution of Plateau Biota, Chinese Academy of Sciences
  • Online:2015-08-13 Published:2015-11-15
  • Contact: BIAN Jianghui E-mail: bjh@nwipb.ac.cn

摘要: 寄生物对宿主繁殖的影响取决于宿主对当前繁殖值和剩余繁殖值的权衡。球虫为微型寄生物,而微型寄生物对宿主当前繁殖值的影响较剩余繁殖值要大。因此,本研究检验了寄生在高原鼠兔肠道内的艾美耳球虫可影响其当前繁殖的假设。在繁殖早、中、晚期,野外共观测高原鼠兔170只。结果表明,不同繁殖期感染率有显著差异。在繁殖中期,未感染雌性的妊娠率显著高于感染雌性。且未妊娠雌性较妊娠雌性有更高的感染强度,但在另外两个繁殖期没有发现此效应。在雄性中,任何繁殖期的感染强度和感染率与睾丸和附睾指数均无显著相关性,且感染和未感染球虫雄性睾丸及附睾指数无显著差异。此外,野外观测实验结果表明,感染雌性的胚胎重较未感染雌性显著降低,与野外感染对胚胎重量影响的实验结果相一致。说明艾美耳球虫感染可影响胚胎的发育。上述结果说明,艾美耳球虫对高原鼠兔繁殖的影响随繁殖期而有不同效应,且存在性别间差异,这种效应可能与不同性别间的繁殖对策有关。

关键词: 艾美耳球虫, 繁殖, 高原鼠兔, 青藏高原

Abstract: The effects that parasitism on host reproduction depends on a trade-off between the host’s current reproductive success and its residual reproductive success. Coccidian parasites are microparasites, and the effect of microparasites on current reproductive success is greater than that on residual reproductive success. We tested the hypothesis that coccidian parasites(Apicomplexa:Eimeriiade) would impact on current reproduction of plateau pikas. In field observations, 170 plateau pikas were trapped in early-, middle- and late-breeding seasons. For infection rate, there were significant differences in breeding seasons. In the mid-period of breeding, non-infective females had a higher pregnant rate than infective females, and non-pregnant females had a higher infection intensity than did pregnant females. However, no effects were found in the other two breeding periods. No significant relationships between infection intensity or infection rate and testis and epididymis index were found in males in any breeding period. There also were no significant differences in testis or epididymis indices between infective and non-infective males. In addition, the field observation experiment results show that the infection with coccidia significantly decreased embryo weights. It was consistent with the results in the field infection experiment in this study. Our results demonstrated parasite infection influence on embryo development. Our results suggest that the sex-biased effects on plateau pika reproduction may be related to hosts modifying their reproductive strategy to optimize fitness.