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首页> 外文学位 >Community structure and dynamics of Monogenea and Trematoda in three North American cyprinid species in the Salt Valley Watershed, Nebraska .
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Community structure and dynamics of Monogenea and Trematoda in three North American cyprinid species in the Salt Valley Watershed, Nebraska .

机译：内布拉斯加州盐谷流域的三个北美鲤科鱼类物种中的单生生物和单生螨的群落结构和动态。

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摘要

An investigation was made of the communities of gill monogene genus Dactylogyrus (Platyhelminthes, Monogenea) and the populations of blackspot parasite (Platyhelminthes, Trematoda) of Pimephales promelas, Notropis stramineus, and Semotilus atromaculatus in 3 distinct sites along the 3 converging tributaries in southeastern Nebraska from 2004 to 2006. This work constitutes the first multi-site, multi-year study of a complex community of Dactylogyrus spp. and their reproductive activities on native North American cyprinid species. The biological hypothesis that closely related species with direct lifecycles respond differently to shared environmental conditions was tested. It was revealed that in this system that, Cyprinid species do not share Dactylogyrus species, host size and sex are not predictive of infection, and Dactylogyrus community structure is stable, despite variation in seasonal occurrence and populations among sites. The biological hypothesis that closely related species have innate differences in reproductive activities that provide structure to their populations and influence their roles in the parasite community was tested. It was revealed that in this system, host size, sex, and collection site are not predictive of reproductive activities, that egg production is not always continuous and varies in duration among congeners, and that recruitment of larval Dactylogyrus is not continuous across parasites' reproductive periods. Hatch timing and host availability, not reproductive timing, are the critical factors determining population dynamics of the gill monogenes in time and space. Lastly, the biological hypothesis that innate blackspot biology is responsible for parasite host-specificity, host recruitment strategies and parasite population structure was tested. Field collections revealed that for blackspot, host size, sex, and collection month and year are not predictive of infection, that parasite cysts survive winter, and that host movement is restricted among the 3 collection sites. Finally, experimental infections of hosts with cercaria isolated from 1 st intermediate snail hosts reveal that cercarial biology, not environmental circumstances, are responsible for differences in infection among hosts.
机译：调查了g虫的单支tri属（Pactyhelminthes，Monogenea）的群落和Pimephales promelas，Notropis stramineus和Semotilus atromaculatus的黑斑寄生虫（Platyhelminthes，Trematoda）的种群，这些昆虫分布在南侧3个汇合的支流中的3个不同地点从2004年到2006年。这项工作是对Dactylogyrus spp复杂社区的首次多站点，多年研究。及其对北美本地鲤科鱼类的繁殖活动。检验了具有直接生命周期的密切相关物种对共享环境条件反应不同的生物学假设。结果表明，在该系统中，尽管季节性发生和种群之间的差异，但赛普勒属物种不共享乳杆菌属物种，寄主的大小和性别不能预测感染，并且乳杆菌群落结构稳定。检验了生物学假设：密切相关的物种在生殖活动中具有先天差异，生殖活动为其种群提供结构并影响其在寄生虫群落中的作用。结果表明，在该系统中，寄主的大小，性别和收集地点不能预测生殖活动，卵的产生并不总是连续的，并且同源物之间的持续时间是不同的，并且幼虫的纲要在寄生虫的生殖之间并不是连续的。期。孵化时间和寄主的可用性而不是繁殖时间是决定mono单基因在时间和空间上种群动态的关键因素。最后，检验了先天黑点生物学负责寄生虫宿主特异性，宿主募集策略和寄生虫种群结构的生物学假设。野外采集表明，对于黑点而言，寄主的大小，性别以及采集的月份和年份不能预测感染，寄生虫囊肿可在冬季幸存，并且在三个采集点中宿主的活动受到限制。最后，从第一只中间蜗牛宿主分离出的尾c宿主的实验性感染表明，子代生物学而不是环境条件是宿主之间感染差异的原因。

著录项

  • 作者

    Knipes, Alaine Kathryn.;

  • 作者单位

    The University of Nebraska - Lincoln.;

  • 授予单位 The University of Nebraska - Lincoln.;
  • 学科 Biology Ecology.;Biology Parasitology.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 214 p.
  • 总页数 214
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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