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首页> 外文学位 >Aligning conservation goals and management objectives for Bonneville cutthroat trout (Oncorhynchus clarki utah) in the Logan River, Utah.
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Aligning conservation goals and management objectives for Bonneville cutthroat trout (Oncorhynchus clarki utah) in the Logan River, Utah.

机译：调整犹他州洛根河（Logan River）邦纳维尔（Bonneville）th鳟（Oncorhynchus clarki utah）的保护目标和管理目标。

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摘要

Watersheds are often managed without direct knowledge of how salmonid species use spatially-distinct spawning habitats within their watersheds, and rarely take into account the relationship between fish movement and potential population structure when making management decisions. The population of native Bonneville cutthroat trout (Oncorhynchus clarki utah) within the Logan River is the largest documented population remaining for this imperiled species, and still maintains extremely high densities of native fish in the upper river. Currently, fishing is not allowed in the upper 20 kilometers of the Logan River watershed during spawning, based on the assumption that cutthroat trout migrate to and spawn primarily in this section. I redetected cutthroat trout tagged (2,271) during years 2008-2012 in seven mainstem and tributary reaches of the Logan River during spawning months (April-June) of 2013 using a combination of stationary detection systems and mobile scanning techniques. Cutthroat trout in both mainstem and tributary reaches exhibit a leptokurtic movement distribution, indicating most fish spawn near to their original tagging site; however, small percentages of trout moved long distances to seek out spawning sites throughout the watershed. Growth, length, and condition estimates between mobile and non-mobile tagged fish demonstrate that while mobile fish tend to growth faster, be slightly larger, and in some cases be in relatively poorer condition, these differences are often biologically insignificant and dependent on site location within the watershed. A genetic microsatellite DNA analysis conducted on trout sampled from each study site confirms the assumption of panmixia, and I observed very little evidence of sub-population structure. Using River StylesRTM to assess geomorphically distinct reaches, I created a large-scale population estimate of spawning individuals, which found approximately 61% of spawning cutthroat trout are not subject to angling during the spawning season, while 39% could be susceptible to harvest in the lower basin and its tributaries. Most trout within the Logan River likely spawned very close to initial tagging locations and microsatellite analyses confirmed the population is genetically well-mixed, indicating conservation efforts should promote risk-averse management throughout the watershed, rather than focus heavily on any one section of the river.
机译：流域的管理常常没有直接了解鲑科物种如何在其流域内使用空间上不同的产卵栖息地的管理，并且在制定管理决策时很少考虑鱼类活动与潜在种群结构之间的关系。洛根河内的本地邦纳维尔残酷鳟鱼（Oncorhynchus clarki utah）种群是该受害物种中记录最多的种群，仍在上游河流保持极高的原生鱼密度。目前，基于尖嘴鳟鱼迁移并主要在该区域产卵的假设，产卵期间在洛根河流域的上游20公里处不允许捕鱼。我使用固定式检测系统和移动扫描技术在2008年至2012年期间于洛金河的七个主干河和支流产卵月（4月至6月）中重新检测了带毒鳟鱼（2,271）。主干和支流河段的鱼鳟鱼均表现出瘦腰运动分布，这表明大多数鱼产卵在其原始标签附近。但是，只有一小部分的鳟鱼长途跋涉，寻找整个分水岭的产卵地点。流动鱼类和非流动鱼类的生长，长度和状况估计表明，流动鱼类往往生长更快，稍大一些，并且在某些情况下处于相对较差的状况，但这些差异通常在生物学上无足轻重，取决于地点在分水岭内。对从每个研究地点取样的鳟鱼进行的遗传微卫星DNA分析证实了大混杂症的假设，而我观察到的亚种群结构证据很少。我使用River StylesRTM评估了地貌上不同的河段，我对产卵个体进行了大规模的种群估计，发现产卵季节中约有61％的杀害鳟鱼不受钓鱼的影响，而39％的人很容易在产卵季节收获。下盆地及其支流。洛根河内的大多数鳟鱼很可能产卵于非常接近初始标签的地点，并且微卫星分析证实了该种群在遗传上是充分混合的，这表明保护工作应促进整个流域的风险规避管理，而不是将重点放在河流的任何部分上。

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  • 作者

    Mohn, Harrison.;

  • 作者单位

    Utah State University.;

  • 授予单位 Utah State University.;
  • 学科 Ecology.;Conservation biology.;Natural resource management.
  • 学位 M.S.
  • 年度 2016
  • 页码 81 p.
  • 总页数 81
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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