热虫感染对两动物四肢发育和生存率的影响
P T Johnson1, K B Lunde, E G Ritchie
1Center for Conservation Biology, Department of Biological Sciences, Stanford University, Stanford, CA 94305-5020, USA. pieter@bing.stanford.edu
Science (New York, N.Y.)
|April 30, 1999
概括
寄生虫感染,特别是 Ribeiroia sp. 的感染. 在太平洋树中被发现会导致严重的四肢形. 增加的寄生虫水平导致更多的形和较低的头生存率.
科学领域:
- 生态生态学 生态生态学
- 寄生虫学的寄生虫学
- 两动物生物学
背景情况:
- 两动物的形问题越来越令人担忧,导致人口减少,但其原因尚未完全理解.
- 人们怀疑寄生虫感染,但与观察到的形直接的因果关系往往是推测性的.
- 太平洋树 (Hyla regilla) 表现出肢体异常,类似于全球两动物数量下降的肢体异常.
研究的目的:
- 为了调查形虫寄生虫感染和两动物四肢形之间的因果关系.
- 为了确定寄生虫Ribeiroia sp.是否存在. 可以通过实验诱导野生两动物种群中观察到的变形.
- 评估寄生虫密度对形和两动物生存率的影响.
主要方法:
- 将太平洋树 (Hyla regilla) 暴露在不同密度的Ribeiroia sp.中. 在受控条件下寻找.
- 量化暴露的肢体诱导异常的频率和严重程度.
- 监测与寄生虫感染水平相关的头生存率.
主要成果:
- 在暴露于Ribeiroia sp.的Hyla regilla中,成功诱导了严重四肢异常的高频率. 他们正在寻找. 搜索. 搜索. 搜索.
- 诱导的异常与在野生两动物种群下降时观察到的异常非常相似.
- 在增加寄生虫密度,更高的异常率和减少子生存率之间发现了直接相关性.
结论:
- 寄生性三角虫,特别是Ribeiroia sp.,是两动物四肢形的重要原因.
- 实验证据支持寄生虫感染是导致两动物变形和数量减少的原因.
- 需要进一步的研究来调查其他两动物物种和现场场的寄生虫诱导的形.
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