Fossil zooplankton and the historical status of westslope cutthroat trout in a headwater lake of Glacier National Park, Montana
Fossil zooplankton and the historical status of westslope cutthroat trout in a headwater lake of Glacier National Park, Montana
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DOI：
10.1577/1548-8659(1997)126
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发表时间：
1997
影响因子：
1.4
通讯作者：
D. Verschuren;L. Marnell
中科院分区：
文献类型：
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作者：
D. Verschuren;L. Marnell
摘要冰川国家公园上游湖泊中存活的克拉氏虹鳟（Oncorhynchus clarki lewisi）纯系种群在区域性虹鳟渔业的管理恢复中发挥着重要作用。然而，不确定性存在是否本地鳟鱼可以自然入侵几个公园湖泊，他们现在发生。这项研究使用古湖泊学技术来解决这个问题，无论是在雪崩湖本地鳟鱼的人口是土著或通过无证引进成为建立。利用对鱼类敏感的枝角类水蚤化石滞育卵的有效性。作为指标的历史上存在的食虫鱼类进行了测试与调查的活浮游动物和相应的表面沉积物化石组合在8个冰川公园湖泊鳟鱼和不鳟鱼。分析雪崩湖的沉积物核心，通过铅放射性同位素，历史野火和洪水来重建z...
Abstract Surviving pure-strain populations of westslope cutthroat trout Oncorhynchus clarki lewisi in headwater lakes of Glacier National Park could play an important role in the managed recovery of regional cutthroat trout fisheries. However, uncertainty exists about whether native trout could have naturally invaded several park lakes where they now occur. This study used paleolimnological techniques to address the question of whether the population of native trout in Avalanche Lake is indigenous or became established through an undocumented introduction. The validity of using fossil diapause eggs (ephippia) of the fish-sensitive cladocerans Daphnia spp. as indicators for the historical presence of zooplanktivorous fish was tested with a survey of live zooplankton and corresponding surface-sediment fossil assemblages in eight Glacier Park lakes with and without trout. Analysis of a sediment core from Avalanche Lake dated by lead radioisotopes, historical wildfires, and a flood allowed reconstruction of z...