Temporal variation, dormancy, and coexistence: A field test of the storage effect
Temporal variation, dormancy, and coexistence: A field test of the storage effect
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DOI：
10.1073/pnas.94.17.9171
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发表时间：
1997-08-19
影响因子：
11.1
通讯作者：
Caceres, CE
中科院分区：
文献类型：
--
作者：
Caceres, CE
理论模型表明，世代重叠，加上时间波动的环境，可能会允许竞争对手的持久性，否则将无法共存。尽管有广泛的理论发展，这种“存储效应”的假设几乎没有得到经验的关注。在这里，我提出了第一个明确的数学分析的存储效应的动态竞争的自然种群，在奥奈达湖，纽约州，在过去的30年中收集的数据显示，两种悬浮液喂养浮游动物，水蚤galeata mendotae和水蚤pulicaria的水柱密度之间的显着负相关。我已经证明了这两个物种之间的竞争，并表明两者都拥有长寿的卵子，建立重叠的世代。此外，进入这个长寿阶段的补充每年都有变化，因此这两种水蚤都有相对于竞争对手更受欢迎的年份（补充）。当计算长期人口增长率时，有和没有变化的环境的影响，我表明，D。如果没有环境变化和延长休眠（即，贮存效应）而D.蚤状蚤通过持续的高人均招募持续到长寿阶段。
Theoretical models suggest that overlapping generations, in combination with a temporally fluctuating environment, may allow the persistence of competitors that otherwise would not coexist. Despite extensive theoretical development, this ''storage effect'' hypothesis has received little empirical attention. Herein I present the first explicit mathematical analysis of the contribution of the storage effect to the dynamics of competing natural populations, In Oneida Lake, NY, data collected over the past 30 years show a striking negative correlation between the water-column densities of two species of suspension-feeding zooplankton, Daphnia galeata mendotae and Daphnia pulicaria. I have demonstrated competition between these two species and have shown that both possess long-lived eggs that establish overlapping generations. Moreover, recruitment to this long-lived stage varies annually, so that both daphnids have years in which they are favored (for recruitment) relative to their competitor. When the long-term population growth rates are calculated both with and without the effects of a variable environment, I show that D. galeata mendotae clearly cannot persist without the environmental variation and prolonged dormancy (i.e., storage effect) whereas D. pulicaria persists through consistently high per capita recruitment to the long-lived stage.