HABITAT USE BY WESTERN POND TURTLES IN THE TRINITY RIVER, CALIFORNIA
HABITAT USE BY WESTERN POND TURTLES IN THE TRINITY RIVER, CALIFORNIA
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加利福尼亚州三一河西部池塘龟的栖息地
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
H. Welsh
中科院分区：
文献类型：
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作者：
Devin A Reese;H. Welsh
为了研究西部池塘龟（Clemmys marmorata）的栖息地利用与筑坝之间的关系，在加州西北部的Trinity河的一条有坝和无坝支流中对西部池塘龟的栖息地进行了研究。筑坝支流有更多的沉积，降低水温，增加树冠覆盖，更高的水流速度，所有这些都是潜在的相关西部池塘龟。水生生境的整体异质性也较低，可能是因为大坝。在筑坝和无坝的网站，西部池龟似乎选择深水低速度和水下避难所的存在。在筑坝的支流上，西部池龟与晒太阳的结构有关，这可能是特别重要的，因为水温低。在未筑坝的支流上，西部池龟往往在河流流速较慢的部分，树冠覆盖较密，水温较高。鉴于渠道形态和流态与筑坝的改变，其影响是，栖息地适合西部池塘龟减少。虽然筑坝可能会增加沿着的深水量，并促进底切堤岸的形成，但它消除了西部池塘海龟喜欢的低速区域，并降低了水温。生境改善工作应侧重于恢复自然结构和水文特征。
Habitat associations of western pond turtles (Clemmys marmorata) were examined in a dammed and undammed tributary of the Trinity River in northwestern California to clarify the relations between habitat use and damming. The dammed tributary had more sedimentation, decreased water temperatures, increased canopy cover, and higher water velocities, all of which are potentially relevant to western pond turtles. The overall heterogeneity of aquatic habitats also was lower, possibly because of the dam. At both dammed and undammed sites, western pond turtles appeared to select for deep water with low velocities and the presence of underwater refugia. On the dammed tributary, western pond turtles were associated with basking structures, which may be particularly important because of the low water temperatures. On the undammed tributary, western pond turtles tended to be in slower-flowing portions of the river with denser canopy cover and higher water temperatures. Given the alterations of channel morphology and flow regimes associated with damming, the implications are that habitat suitability for western pond turtles is decreased. While damming may increase the amount of deep water along shores and promote formation of undercut banks, it eliminates low-velocity areas preferred by western pond turtles and lowers water temperatures. Habitat enhancement efforts should focus on restoring natural structural and hydrological features.