Characteristics of a New Rainbow Trout Population: Spirit Lake, Mount St. Helens Volcano, 2000–2015
Characteristics of a New Rainbow Trout Population: Spirit Lake, Mount St. Helens Volcano, 2000–2015
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新虹鳟鱼种群的特征：圣海伦斯火山 Spirit Lake，2000-2015 年
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
S. Claeson
中科院分区：
文献类型：
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作者：
Tara E. Blackman;C. Crisafulli;S. Claeson
1980 年圣海伦斯火山喷发严重改变了灵湖的面貌，所有呼吸空气的生物都灭绝了。虹鳟鱼 (Oncorhynchus mykiss) 种群大约于 1991 年建立，并于 2000 年至 2014 年进行监测。在此期间，虹鳟鱼种群数量增加，而个体鱼的尺寸（长度和质量）显着减小。鱼类的食物主要由小型猎物组成，主要是水生昆虫和水生蜗牛，没有观察到鱼食。最近（2011 年）对幼鱼占据流入 Spirit Lake 的溪流的观察表明，溪流栖息地对于产卵和饲养的适宜性有所增加，这可能是种群动态变化和年度变化的原因。
Spirit Lake was grossly altered by the 1980 eruption of Mount St. Helens and all air-breathing life perished. A rainbow trout (Oncorhynchus mykiss) population was established circa 1991 and monitored from 2000 to 2014. During that time, the trout population increased, and individual fish size significantly decreased (both length and mass). Fish diets were primarily composed of small prey items, mostly aquatic insects and aquatic snails, and piscivory was not observed. The relatively recent (2011) observation of juvenile fish occupying streams draining into Spirit Lake suggests an increased suitability of stream habitat for both spawning and rearing, which may account for the changing population dynamics and annual variation.