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首页> 外文期刊>The Open Fish Science Journal >Evidence of Young Humpback Chub Overwintering in the Mainstem Colorado River, Marble Canyon, Arizona, USA
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Evidence of Young Humpback Chub Overwintering in the Mainstem Colorado River, Marble Canyon, Arizona, USA

机译：美国亚利桑那州大理石峡谷，Mainstem科罗拉多河的年轻座头驼丘越冬的证据

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Global climate change models predict that the southwestern United States will become warmer and drier, resulting in decreased reservoir volumes, increased water temperatures, and changes in fish distributions. Such conditions may also result from drought and water extraction. Our observations of humpback chub Gila cypha allowed us to test predicted impacts of increased water temperatures released from Glen Canyon Dam on this federally listed endangered cyprinid endemic to the Colorado River Basin. We modeled the potential that the young humpback chub we captured in 2006 and 2007 were hatched and reared up to 50 km upstream from the Little Colorado River, the natal origin of the majority of the humpback chub population below Glen Canyon Dam. Larval and adult humpback chub have been observed by others in our study reach in the post-dam era. Humpback chub assumed to be juveniles have been observed in our study area, but their ages were not confirmed. Our observations of humpback chub were coincident with not only increased water temperatures as a result of regional drought, but also decreasing rainbow trout population numbers and some constraints on dam release fluctuations. One or all of these factors could have contributed to increased survivorship of young humpback chub. The most parsimonious explanation for our observations was that the largest young humpback chub captured at our study site took advantage of warmer water temperatures to grow to one and two years of age. Continued favorable habitat conditions in this reach would likely support recruitment to adulthood and reproduction. Managers wish to increase the likelihood that a self-sustaining mainstem Colorado River population of humpback chub is established, distinct from the larger Little Colorado River population. Our results indicate that a separate population may be successfully established.
机译：全球气候变化模型预测，美国西南部将变暖和干燥，从而导致水库容量减少，水温升高和鱼类分布变化。干旱和水提取也可能导致这种情况。我们对座头鲸丘吉拉小天鹅的观察使我们能够测试从格伦峡谷大坝释放的水温升高对科罗拉多州流域这种联邦特有的濒危塞浦路斯特有物种的影响。我们模拟了在2006年和2007年捕获的年轻座头驼背在小科罗拉多河上游孵化并饲养到50公里上游的可能性，小科罗拉多河是格伦峡谷大坝以下大部分座头驼背的出生地。在大坝后时代的研究中，其他人已经观察到幼虫和成年座头鲸。在我们的研究区域中已观察到被认为是少年的座头鲸，但尚未确认其年龄。我们对座头鲸的观察不仅与区域干旱导致水温升高有关，而且与虹鳟种群数量的减少以及对大坝释放波动的某些限制相吻合。这些因素中的一个或全部可能有助于增加年轻座头鲸的成活率。对于我们的观察结果，最简约的解释是，在我们的研究地点捕获的最大的年轻座头鲸是利用温暖的水温长到一岁和两岁。在这一范围内继续有利的生境条件将可能支持成年和繁殖。经理们希望增加建立自我维持的科罗拉多河驼背驼背种群的可能性，这与较大的小科罗拉多河种群不同。我们的结果表明可以成功建立一个单独的种群。

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