Long-term changes in the copepod community of Lake Geneva
Long-term changes in the copepod community of Lake Geneva
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DOI：
10.1093/plankt/fbl066
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发表时间：
2007-03-01
影响因子：
2.1
通讯作者：
Gerdeaux, Daniel
中科院分区：
文献类型：
--
作者：
Anneville, Orlane;Molinero, Juan Carlos;Gerdeaux, Daniel
日内瓦湖是一个很深的高山附近的湖泊，自20世纪70年代以来一直有一个持续的监测项目。这个湖长期以来一直饱受富营养化之苦。20世纪80年代初，一项修复计划导致磷浓度逐步降低。在同一时期，该湖通过水的整体变暖和分层时间的变化来应对大规模的气候变化。浮游生物的组成和物候都受到了影响。本文重点研究了观察到的桡足类群落的长期变化。我们的发现突显了向以金枪鱼为主的桡足类群落的转变。此外，我们还发现了一段时期(1986至1991年，1988年除外)，其特点是物种演替具有不寻常的季节性模式。据认为，这些变化是由浮游植物群落的质变引起的，并突显了浮游物种之间营养相互作用的波动。因此，重新营养不足和气候变暖成为间接的强迫因素，这些发现促成了关于桡足类是否可以用作环境变化指标的辩论。
Lake Geneva is a deep, peri-alpine lake where there has been a continuous monitoring program since the 1970s. The lake has long suffered from eutrophication. In the early 1980s, a restoration plan resulted in a progressive reduction in the phosphorus concentration. During the same period, the lake responded to large-scale climate changes by overall warming of the water, and changes in the timing of stratification. Both the composition and the phenology of the plankton have been affected. This paper focuses on the long-term changes observed in the copepod community. Our findings highlight a switch towards a copepod community dominated by calanoids. In addition we have detected a period (1986 to 1991, 1988 excluded) characterized by an unusual seasonal pattern of species succession. It is suggested that these changes have been induced by qualitative changes in the phytoplankton community, and underline fluctuations in trophic interactions between planktonic species. Re-oligotrophication and warming, therefore, emerge as indirect forcing factors, and these findings contribute to the debate about whether copepods can be used as indicators of environmental changes.