Community structure in temporary freshwater pools: disentangling the effects of habitat size and hydroregime
Community structure in temporary freshwater pools: disentangling the effects of habitat size and hydroregime
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临时淡水池中的群落结构：理清栖息地大小和水文状况的影响
DOI：
10.1111/j.1365-2427.2009.02198.x
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发表时间：
2009
影响因子：
2.7
通讯作者：
L. Brendonck
中科院分区：
文献类型：
--
作者：
B. Vanschoenwinkel;A. Hulsmans;E. D. Roeck;C. D. Vries;M. Seaman;L. Brendonck
总结
1.水文状况（水生阶段的持续时间、频率和可预测性）是临时水生生境的一个关键特征，不仅塑造了群落结构和多样性（物种分类），而且塑造了居民的生活史特征（自然选择）。然而，由于水文是一个复杂的多维实体，不能估计从短期的观察，形态变量通常被用作代理水文，使它不可能分开的栖息地大小和水文对生物区系的影响。
2.我们已经使用了一个简单的水文模型，最近（平均r2 = 96%）和历史水位观测（平均r2 = 81%）验证，准确地重建水文的基础上，在南非中部的36个临时岩池集群的历史降雨量和蒸发数据。
3.使用模型的输出，我们证明了水文和栖息地的大小有独特的和共享的临时池生物群的影响，这些影响取决于分散模式的类群。模型生成的水文数据解释了更多的变化，在社区模式比短期观测的水文周期。水文制度是更重要的被动扩散比主动扩散，可以迁移时池干涸。盆地形态是一个相对较差的预测池水文制度。我们的结论是，简单的建模可以大大提高分辨率的研究联系水文生物变量。
4.水文变化的准确说明提供了一个坚实的基础，了解群落和种群结构和动态的临时水生栖息地。由于近几十年来这些栖息地中的许多已经被破坏或退化，我们的发现和工具可能有助于制定可靠的保护指南。
Summary
1. Hydroregime (duration, frequency and predictability of the aquatic phase) is a key feature of temporary aquatic habitats that not only moulds community structure and diversity (species sorting) but also life history characteristics of the inhabitants (natural selection). However, since hydroregime is a complex multidimensional entity that cannot be estimated from short term observations, morphometric variables are commonly used as proxies for hydroregime, making it impossible to separate effects of habitat size and hydroregime on biota.
2. We have used a simple hydrological model, validated with recent (average r2 = 96%) and historic water level observations (average r2 = 81%), to accurately reconstruct hydroregime based on historical rainfall and evaporation data in a cluster of 36 temporary rock pools in central South Africa.
3. Using the model output, we demonstrated that both hydroregime and habitat size had unique and shared effects on temporary pool biota and that these effects depended on the dispersal modes of the taxa. Model-generated hydrological data explained more variation in community patterns than short-term observations of hydroperiod. Hydroregime was more important for passive dispersers than for active dispersers that can migrate when pools dry up. Basin morphometry was a relatively poor predictor of pool hydroregime. We concluded that simple modelling may greatly improve the resolution of studies linking hydroregime to biological variables.
4. An accurate account of hydrological variation provides a firm foundation to understand community and population structure and dynamics in temporary aquatic habitats. Since many of these habitats have been destroyed or degraded in recent decades, our findings and tools may contribute to the development of reliable conservation guidelines.