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A paradox of the ciliates? High ciliate diversity in a resource-poor environment

机译：纤毛虫的悖论？资源匮乏的环境中纤毛多样性高

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摘要

Ecological theory predicts that low productivity systems should have low biodiversity. However, despite the oligotrophic status of the Gulf of Aqaba (Northern Red Sea) ciliate species richness was unexpectedly high. In addition, phytoplankton, as main ciliate prey, was made up by only few genera, indicating a significant niche overlap among the grazers. Up to 97% of the ciliates were from the same taxonomic group and of the same size range, implying very similar food niches. Ciliate diversity was highest at times of lowest chlorophyll concentrations, during the period of stable abiotic conditions, but relatively high genetic diversity within the ciliate prey, notably among the cyanobacteria Synechococcus and Prochloro-coccus. In the absence of disturbance and with little pre-dation pressure, the alternate explanations for the observed ciliate diversity are either very fine niche partitioning by the ciliates, or their competitive equivalence resulting in a random assortment of species immigrating from a largerrnmetacommunity, in accordance with Hubbell's, (The unified neutral theory of biodiversity and biogeography. Princeton University Press, Princeton, 2001) neutral model. While the use of species abundance distributions (SAD's) is far from definitive, the theoretical SAD's that best fit the Gulf of Aqaba ciliate data was most often not that expected by neutral theory.
机译：生态学理论预测，低生产力系统应具有低生物多样性。然而，尽管亚喀巴湾（北部红海）处于贫营养状态，纤毛虫物种丰富度却出乎意料地高。此外，浮游植物是主要的纤毛虫，仅由少数属组成，这表明放牧者之间的生态位明显重叠。多达97％的纤毛虫来自相同的生物分类组，并且具有相同的大小范围，这意味着非常相似的食物生态位。在稳定的非生物条件期间，纤毛虫的多样性在叶绿素浓度最低的时候最高，但是纤毛虫猎物内的遗传多样性相对较高，尤其是在蓝细菌Syechococcus和Prochloro-coccus中。在没有干扰且捕食压力较小的情况下，根据观察到的纤毛虫多样性的替代解释是纤毛虫对生态位的划分非常精细，或者它们的竞争性对等，从而导致从较大的群落中迁移的物种随机分类。 Hubbell's（生物多样性和生物地理学的统一中立理论，普林斯顿大学出版社，普林斯顿，2001年）。尽管物种丰富度分布（SAD's）的使用尚不确定，但最适合亚喀巴湾纤毛虫数据的理论SAD通常不是中性理论所期望的。

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  • 来源
    《Marine biology》 |2010年第3期|483-494|共12页
  • 作者

    Monika Claessens; Stephen A. Wickham; Anton F. Post; Michel Reuter;

  • 作者单位

    Department of Organismic Biology, University Salzburg, Hellbrunnerstrasse 34, 5020 Salzburg, Austria;

    rnDepartment of Organismic Biology, University Salzburg, Hellbrunnerstrasse 34, 5020 Salzburg, Austria;

    rnThe Interuniversity Institute for Marine Sciences, Coral Beach POB 469, 88103 Eilat, Israel;

    Department of General Ecology and Limnology, University Cologne, Weyertal 119, 50923 Cologne, Germany;

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