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首页> 外文期刊>Marine ecology progress series >Stable trophic structure across coastal nekton assemblages despite high species turnover
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Stable trophic structure across coastal nekton assemblages despite high species turnover

机译：尽管物种周转率很高，但沿沿海Nekton组合的营养结构却稳定

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摘要

The finding of invariant structures in species assemblages is of primary importance for ecology because it would suggest that, despite species turnover and environmental gradients, some self-organizing principles may shape these assemblages. Tropical estuarine and coastal ecosystems are ideal for investigating patterns in trophic structures because they contain many species and are characterized by a high variability for both biotic and abiotic variables. We used the data from a 150 km long transect in the Terminos Lagoon region (Campeche State, Mexico) where 37 stations were sampled monthly during 1 yr for both abiotic parameters and nektonic assemblages. We then quantified 3 complementary components of trophic diversity (trophic richness, trophic evenness and trophic divergence) and then challenged the idea that some stable structures may emerge. We found that abiotic parameters, space and time have weak explanatory power on trophic diversity indices. We also observed a high species turnover both at local and regional scales, but it was unrelated to the small variations of trophic diversity indices. This stability of trophic structure is partly due to the predominance of the trophic class 3.25 to 3.5, which accounted invariably for between 50 and 60% of the total nekton biomass across space and time. These findings suggest that the species turnover observed in our system is not random but, rather, allows maintenance of the same abundance distribution along the trophic axis. The mechanisms underlying these emergent properties of trophic structures deserve to be investigated through the use of trophodynamic models.
机译：在物种集合中发现不变结构对于生态学至关重要，因为它表明尽管物种更新和环境梯度不同，但某些自组织原理仍可能影响这些集合。热带河口和沿海生态系统是研究营养结构模式的理想选择，因为它们包含许多物种，并且具有生物和非生物变量的高度可变性。我们使用的是来自Terminos泻湖地区（墨西哥坎佩切州）的150公里长样带的数据，该地区在1年期间每月采样37个站的非生物参数和中子组合。然后，我们量化了营养多样性的3个互补成分（营养丰富度，营养均匀度和营养差异），然后挑战了可能出现一些稳定结构的想法。我们发现非生物参数，空间和时间对营养多样性指数的解释能力较弱。我们还观察到了在地方和区域范围内物种的高周转率，但这与营养多样性指数的小变化无关。营养结构的这种稳定性部分归因于营养类3.25至3.5的优势，在空间和时间上，营养类始终占总肾脏生物量的50％至60％。这些发现表明，在我们的系统中观察到的物种更新不是随机的，而是允许沿营养轴保持相同的丰度分布。营养结构的这些新兴特性的潜在机制值得通过使用营养动力学模型进行研究。

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