Signature of ecological partitioning in the maintenance of damselfly diversity
Signature of ecological partitioning in the maintenance of damselfly diversity
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DOI：
10.1111/j.1365-2656.2011.01863.x
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发表时间：
2011-11-01
影响因子：
4.8
通讯作者：
McPeek, Mark A.
中科院分区：
文献类型：
--
作者：
Siepielski, Adam M.;Mertens, Andrew N.;McPeek, Mark A.
1. 共存类群之间的生态差异常常被用来解释维持生物多样性。这些差异是否促进了共存，从而使不平等的竞争者能够留在系统中，从而维持生物多样性，目前尚不清楚。2．在这里，我们利用观察和实验研究来测试生态分区，以促进三个共生豆娘属之间的共存。我们评估了共存的两个必要条件：（i）豆娘属与其他豆娘属和环境条件相互作用的能力不同，因此它们的相对丰度沿着环境梯度变化不同；（ii）属内丰度的增加比属间丰度的增加对每个属与性能相关的人口统计特征更有害。 3。对 40 个湖泊的观测研究表明，每个属的相对丰度沿着与生态分区一致的湖泊非生物和生物特征的环境梯度存在不同的共变。我们操纵属内和属间密度的田间实验表明，每个属的人均增长率与密度呈负相关，并且仅受属内而非属间密度增加的限制。4．总的来说，这些结果显示了每个属之间生态分区的清晰特征，这应该可以防止竞争排斥并维持该系统中的每个属。结果并不能保证三个属之间的局部共存，但符合促进它们共存的标准。我们的结果还表明，将关键捕食和明显竞争结合起来的食物网模型可能有必要解释这些属之间持久存在的生态动力学。
1. Ecological differences among co-occurring taxa are often invoked as an explanation for the maintenance of biodiversity. Whether these differences facilitate coexistence, which allows unequal competitors to remain in systems and thus maintain biodiversity, is still unclear.2. Here, we used observational and experimental studies to test for ecological partitioning in ways that would promote coexistence among three co-occurring damselfly genera. We evaluated two necessary conditions for coexistence: (i) that the damselfly genera differ in their abilities to engage in interactions with other damselfly genera and environmental conditions such that their relative abundances covary differently along environmental gradients and (ii) that an increase in intra-generic abundance is more detrimental to performance-related demographic features of each genus than increases in intergeneric abundances.3. Observational studies across 40 lakes showed that relative abundances of each genus covaried differently along an environmental gradient of lake abiotic and biotic features consistent with ecological partitioning. Field experiments in which we manipulated both intra-and intergeneric densities demonstrated that per capita growth rates of each genus are negatively density-dependent and are only limited by increases in intra-not intergeneric densities.4. Collectively, these results show a clear signature of ecological partitioning among each genus, which should prevent competitive exclusion and maintain each genus in this system. The results do not guarantee local coexistence among the three genera but are consistent with criteria that should promote their coexistence. Our results also suggest that a food web model coupling keystone predation and apparent competition is likely necessary to explain the ecological dynamics of persistence among these genera.