DO–Temperature habitat loss due to eutrophication in Tenkiller Reservoir, Oklahoma, USA
DO–Temperature habitat loss due to eutrophication in Tenkiller Reservoir, Oklahoma, USA
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DO——美国俄克拉荷马州 Tenkiller 水库富营养化导致的温度栖息地丧失
DOI：
10.1080/07438141.2011.607553
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T. Gendusa
中科院分区：
文献类型：
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作者：
E. Welch;G. Cooke;John R. Jones;T. Gendusa
摘要1975年至1986年，Tenkiller水库成为富营养化，主要是由于家禽垃圾的做法，在分水岭，导致溶解氧（DO）的快速耗尽的Meta和hypolimonion。耗竭主要是由于高磷流入和内部负荷，以及随后的河水暴跌的Meta和hypolimonion的河流区藻类生产。这一过程中的溶解氧耗尽大大减少了夏季栖息地的冷水鱼类。在2005年和2006年6月中旬至9月中旬，小嘴鲈鱼（SMB）生长的最佳和次优栖息地平均仅占总水库体积的10%和25%。对于海象（WAL），可接受的（次优）栖息地基本上是不存在的（<1%），由于其较低的温度标准。相比之下，这两个物种的栖息地是更大的寡中营养Broken Bow，一个物理上类似的参考水库。SMB和WAL在系统调查期间的长期渔获率平均高3倍，在Broken Bow，更大的可接受的DO温度栖息地比在Tenciller。相反，大口黑鲈，一个喜欢富营养化条件的暖水物种，捕获率平均高出2倍以上的断弓。这些捕获率的差异是一致的DO温度条件下，分层期间和营养状态在这2个水库。通过停止使用家禽垫料，预计Tenckiller冷水鱼栖息地的恢复将是缓慢的。[本文有补充材料。转到出版商的在线版湖泊和水库管理查看补充文件。]
Abstract Tenkiller Reservoir became eutrophic between 1975 and 1986, primarily due to poultry litter practices in the watershed, resulting in rapid dissolved oxygen (DO) depletion in the meta- and hypolimnion. Depletion was driven largely by high riverine-zone algal production due to high phosphorus inflow and internal loading, and the subsequent plunging of riverine water to the meta- and hypolimnion. This process of DO depletion greatly reduced summer habitat for cool-water fish species. Optimal and suboptimal habitat for smallmouth bass (SMB) growth averaged only 10 and 25% of total reservoir volume, respectively, during mid-June to mid-September in 2005 and 2006. For walleye (WAL), acceptable (suboptimal) habitat was essentially absent (<1%) due to its lower temperature criterion. By contrast, habitat for both species was much greater in oligo-mesotrophic Broken Bow, a physically similar reference reservoir. Long-term catch rates for SMB and WAL during systematic surveys averaged 3-fold higher in Broken Bow, with greater acceptable DO–temperature habitat than in Tenkiller. Conversely, catch rates for largemouth bass, a warm-water species preferring eutrophic conditions, averaged 2-fold higher in Tenkiller than Broken Bow. These catch rate differences are consistent with the DO–temperature conditions available during the stratified period and the trophic states in these 2 reservoirs. Recovery of cool-water fish habitat in Tenkiller by ceasing poultry litter application is predicted to be slow. [Supplemental materials are available for this article. Go to the publisher's online edition of Lake and Reservoir Management to view the supplemental file.]