Adding Nutrients to Enhance the Growth of Endangered Sockeye Salmon: Trophic Transfer in an Oligotrophic Lake
Adding Nutrients to Enhance the Growth of Endangered Sockeye Salmon: Trophic Transfer in an Oligotrophic Lake
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添加营养物质以促进濒临灭绝的红鲑鱼的生长：寡营养湖中的营养转移
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
W. Wurtsbaugh
中科院分区：
文献类型：
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作者：
P. Budy;C. Luecke;W. Wurtsbaugh
蛇河红鲑Oncorhynchus nerka于1991年被美国法律列为濒危物种，以应对溯河产卵成年数量的下降，在爱达荷州的红鱼湖度过它们的前1-2年，然后迁移到大海。为了确定营养强化可能如何影响浮游植物、浮游动物和鱼类生产，我们在这个贫营养湖泊的大型围隔中使用幼年科卡尼（湖泊O. nerka）作为濒危红鲑鱼的类似物。施肥的metalimnion大幅增加叶绿素a（150%），浮游植物生物量（75%），初级生产力（250%），浮游动物生物量（200%），并适度增加鱼类生长（12%）超过我们的控制外壳。浮游植物和浮游动物群落组成变化不大，水体透明度下降小于15%。因此，我们得出结论，高沼施肥可以保持这些湖泊的美学价值，同时增加动物园规划。
Abstract Snake River sockeye salmon Oncorhynchus nerka listed under U.S. law as endangered in 1991 in response to a decline in anadromous adult numbers, spend their first 1–2 years in Redfish Lake, Idaho, before migrating to the sea. To determine how nutrient enhancement might influence phytoplankton, zooplankton, and fish production, we performed fertilization experiments in large enclosures in this oligotrophic lake using juvenile kokanee (lacustrine O. nerka) as analogues for endangered sockeye salmon. Fertilization of the metalimnion substantially increased chlorophyll a (150%), phytoplankton biovolume (75%), primary productivity (250%), and zooplankton biomass (200%), and moderately increased fish growth (12%) over our control enclosures. Community composition of phytoplankton and zooplankton changed little, and water transparency declined less than 15% compared with controls. Thus, we concluded that metalimnetic fertilization could maintain the aesthetic value of these lakes while increasing zooplan...