...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Canadian Journal of Zoology >Do parasites matter? Assessing the fitness consequences of haemogregarine infection in snakes
【24h】

Do parasites matter? Assessing the fitness consequences of haemogregarine infection in snakes

机译：寄生虫重要吗？评估蛇血中糖尿激素感染的健身后果

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Although much research in evolutionary ecology is based upon the premise that high levels of parasitism impair the host's functioning, the assumed link between parasitism and fitness has been assessed for relatively few kinds of animals. At our studysite in tropical Australia, keelback snakes (Tropidonophis mairii (Gray, 1841), Colubridae) are heavily infected with haemogregarine blood parasites: 90% of snakes that we tested carried the parasite, with the proportion of erythrocytes containing haemogregarines averaging 15% and ranging up to a remarkable 64%. Prevalence increased with snake body size, but intensity decreased with age. Unlike lizards studied previously, the snakes did not respond to haemogregarine infection by releasing immature erythrocytes into the circulation. In striking contrast to results from a recent study on a sympatric snake species, we did not find any empirical links between parasite numbers and several measures of host fitness (body condition, growth rate, feeding rate,antipredator behaviour, locomotor performance, reproductive status, reproductive output, and recapture rate). The association between this parasite and its host thus appears to be surprisingly benign, suggesting that host-parasite interactions sometimesmay have only trivial consequences for host fitness in natural populations. Plausibly, host-parasite coevolution weakens or eliminates fitness costs of parasitism.
机译：尽管在进化生态学方面的许多研究都是基于高水平的寄生虫损害宿主机能的前提下进行的，但对相对少数种类的动物评估了寄生虫与健康之间的假定联系。在我们位于澳大利亚热带地区的研究现场，龙骨蛇（Tropidonophis mairii（格雷，1841年，Colubridae））被血红蛋白血寄生虫严重感染：我们测试的蛇中有90％携带了该血寄生虫，其中含血红蛋白的红细胞的比例平均为15％，范围高达64％。患病率随蛇体大小而增加，但强度随年龄而降低。与先前研究的蜥蜴不同，这些蛇不会通过将未成熟的红细胞释放到循环系统中来对血黄素的感染作出反应。与最近对同伴蛇种的研究结果形成鲜明对比的是，我们没有发现寄生虫数量与宿主适应性的几种度量之间的经验联系（身体状况，生长速度，摄食率，抗捕食者行为，运动能力，生殖状态，生殖产出和再捕获率）。因此，该寄生虫与其宿主之间的关联似乎令人惊讶地良性，这表明宿主与寄生虫之间的相互作用有时对自然种群中的宿主适应性可能仅具有微不足道的影响。寄主-寄生虫共进化有可能减弱或消除寄生虫的适应成本。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号