...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied Microbiology >Spatial Variation and Survival of Salmonella enterica Subspecies in a Population of Australian Sleepy Lizards (Tiliqua rugosa)
【24h】

Spatial Variation and Survival of Salmonella enterica Subspecies in a Population of Australian Sleepy Lizards (Tiliqua rugosa)

机译：澳大利亚嗜睡蜥蜴（Tiliqua rugosa）人群中沙门氏菌亚种的空间变异和生存

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The life cycles of many enteric bacterial species require a transition between two very distinct environments. Their primary habitat is the gastrointestinal tract of the host, while their secondary habitat, during transmission from one host to another, consists of environments external to the host, such as soil, water, and sediments. Consequently, both host and environmental factors shape the genetic structure of enteric bacterial populations. This study examined the distribution of four Salmonella enterica subspecies in a population of sleepy lizards, Tiliqua rugosa , in a semiarid region of South Australia. The lizards living within the 1,920-m by 720-m study site were radio tracked, and their enteric bacteria were sampled at regular intervals throughout their active seasons in the years 2001, 2002, and 2006. Four of the six subspecies of S. enterica were present in this population and were nonrandomly distributed among the lizards. In particular, S. enterica subsp. diarizonae was restricted to lizards living in the most shaded parts of the study site with an overstorey of Casuarina trees. Experiments undertaken to investigate the survival of S. enterica cells under seminatural conditions revealed that cell survival decreased with increased exposure to elevated temperatures and UV light. Among the three S. enterica subspecies tested, S. enterica subsp. diarizonae consistently had an average expected life span that was shorter than that observed for the other two subspecies. There was no indication in the data that there was any competitive dominance hierarchy among the S. enterica subspecies within individual hosts. Thus, the nonrandom distribution of S. enterica subspecies in this population of lizards appears to be driven by their different survival characteristics in the external environment.
机译：许多肠细菌物种的生命周期需要在两个非常不同的环境之间进行转换。它们的主要栖息地是宿主的胃肠道，而它们的次生栖息地在从一个宿主传播到另一宿主的过程中，则包含宿主外部的环境，例如土壤，水和沉积物。因此，宿主和环境因素都会影响肠道细菌种群的遗传结构。这项研究检查了南澳大利亚半干旱地区困蜥蜴（Tiliqua rugosa）的四个蜥蜴沙门氏菌亚种的分布。对生活在1,920米至720米研究地点内的蜥蜴进行了无线电跟踪，并在2001、2002和2006年的整个活动季节中定期采样其肠细菌。肠炎沙门氏菌六个亚种中的四个存在于该种群中，并且在蜥蜴之间非随机分布。特别地，肠炎沙门氏菌亚种。 diarizonae只限于蜥蜴生活在研究地点最阴暗的地方，那里有一层木麻黄树。为研究半天然条件下肠炎链球菌的存活而进行的实验表明，随着暴露于高温和紫外线的增加，细胞存活率降低。在测试的三个肠炎沙门氏菌亚种中，肠炎沙门氏菌亚种。扁桃体的平均预期寿命一直短于其他两个亚种的平均寿命。数据中没有迹象表明单个寄主内的肠炎沙门氏菌亚种之间存在竞争优势。因此，该蜥蜴种群中肠炎沙门氏菌亚种的非随机分布似乎是由它们在外部环境中的不同生存特征驱动的。

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