Priority effects and species sorting in a long paleoecological record of repeated community assembly through time
Priority effects and species sorting in a long paleoecological record of repeated community assembly through time
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DOI：
10.1890/10-1645.1
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发表时间：
2011-12-01
期刊：
影响因子：
4.8
通讯作者：
Verschuren, Dirk
中科院分区：
文献类型：
--
作者：
Mergeay, Joachim;De Meester, Luc;Verschuren, Dirk
我们通过分析水蚤（水蚤）的群落更替来响应波动的热带湖泊中强烈且反复的环境变化，研究了环境物种分类和长期尺度生态群落组装中的优先效应的相对作用。在过去的 1800 年里，奈瓦沙湖（肯尼亚）在低水位时的小型咸水池塘栖息地和高水位时的大型淡水湖栖息地之间反复波动。从古生态重建开始，我们估计了 16 个栖息地更替中水蚤群落聚集的优先效应的作用，并将其与群落对对物种分类很重要的三个环境变量的重建变化的响应进行了比较。我们的结果表明，高水位期间水蚤群落组成的最佳预测因素是从低水位到高水位过渡之前的群落组成。这反映了晚期低水位群落对高水位群落的长期优先效应，当剩余的低水位种群填充快速扩张的湖泊栖息地中新的可用生态空间时，就会产生这种效应。在低水位期间，物种分类和优先效应对群落组成具有可比但相对较小的影响。此外，随着水蚤群落对环境变化的反应，这些优先效应随着时间的推移而迅速衰减，而高位群落的优先效应持续了几十年。
We studied the relative roles of environmental species sorting and priority effects in the assembly of ecological communities on long time scales, by analyzing community turnover of water fleas (Daphnia) in response to strong and recurrent environmental change in a fluctuating tropical lake. During the past 1800 years, Lake Naivasha (Kenya) repeatedly fluctuated between a small saline pond habitat during lowstands and a large freshwater lake habitat during highstands. Starting from a paleoecological reconstruction, we estimated the role of priority effects in Daphnia community assembly across 16 of these habitat turnovers and compared this with the response of the community to reconstructed changes in three environmental variables important for species sorting.Our results indicate that the best predictor of Daphnia community composition during highstands was the community composition just prior to the transition from lowstands to highstands. This reflects a long-lasting priority effect of late lowstand communities on highstand communities, arising when remnant lowstand populations fill newly available ecological space in the rapidly expanding lake habitat. Species sorting and priority effects had a comparable but relatively small influence on community composition during the lowstands. Moreover, these priority effects decayed rapidly with time as Daphnia communities responded to environmental change, in contrast with the highstand communities where priority effects lasted for several decades.