Structure, dynamics and stability of a Mediterranean river food web
Structure, dynamics and stability of a Mediterranean river food web
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地中海河流食物网的结构、动态和稳定性
DOI：
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发表时间：
2016
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通讯作者：
J. M. T. Figueroa
中科院分区：
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作者：
Ignacio Peralta‐Maraver;M. López‐Rodríguez;J. M. T. Figueroa
我们介绍了一项对地中海河流一年四季食物网的研究结果。已经产生了高分辨率的分类描述来表征不同的群落成分。我们还通过分析生物的肠道内容物来确定它们之间的营养关系。从网络的拓扑结构中，我们提取了节点数和链路数等描述网络结构复杂性的描述符。我们发现连接性和多样性(无论是生物的还是功能的)之间存在正相关。此外，我们开发并应用了一种定量的方法来估计链路强度，这表明并不是构成网络的所有链路都同样重要。在这篇论文中，我们表明食物网链接的强度随着时间的推移而变化，但有一种自然的趋势，即全年保持少量的强链接。然而，两个连续的强联系的存在并不常见，这意味着营养级联不被促进。
We present the results of a study of the food web of a Mediterranean river in the four seasons of the year. A high-resolution taxonomic description has been produced to characterise the different community components. We have also determined the trophic relationships among organisms by analysing their gut contents. From the network topology, we extracted several descriptors of structural complexity of the comunity in terms of number of nodes and links. We found a positive relationship between connectance and diversity (both biological and functional). Moreover, we developed and applied a quantitative approach to estimate the link strength, which showed that not all links constituting the network are equally important. In the present paper, we show that the strength of the food-web links vary over time, but there is a natural tendency to keep a small set of strong links throughout the year. However, the existence of two consecutive strong links is not common, meaning that trophic cascades are not promoted.