Forest continuity acts congruently with stand maturity in structuring the functional composition of saproxylic beetles
Forest continuity acts congruently with stand maturity in structuring the functional composition of saproxylic beetles
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森林连续性与林分成熟度在构建腐木甲虫的功能组成方面发挥着一致作用
DOI：
10.1016/j.biocon.2016.11.021
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发表时间：
2017
影响因子：
5.9
通讯作者：
C. Bouget
中科院分区：
文献类型：
--
作者：
P. Janssen;M. Fuhr;Eugénie Cateau;B. Nusillard;C. Bouget
森林中的长期时间连续性已被证明通过扩散和补充限制来影响生物多样性。然而，对于依赖林分成熟度属性的活动分类群来说，这些限制可能不那么重要。此外，虽然某些栖息地可能会很快形成，但其他栖息地的发展可能需要很长时间。因此，森林连续性和林分成熟度可能会对生物多样性产生相加影响。了解它们对生物多样性的相对影响对于保护至关重要。我们采用平衡抽样设计，将森林连续性(古代与现代)和林分成熟度(成熟与过熟)进行交叉，探索腐植酸甲虫群落的种类和功能性状组成的响应。我们在山地森林里建立了40个地块，在那里我们采集了甲虫的样本。林分成熟度与枯材资源有关，在树种和功能性状组成上都表现出较强的环境过滤效应。无论森林的连续性如何，在过熟林分中，偏爱后期腐烂阶段的大木材的物种更多。此外，过熟林分促进了不同资源需求差异的腐胺甲虫的共生。森林连续性与林分成熟度的相互作用引起群落的分类和功能变化。与其他森林类型相比，古森林中的过熟林分拥有更多特征物种的群落，具有更大的平均身体尺寸和喜欢大死木碎片的物种。最后，在这些森林中发现了更多不同的身体尺寸。因此，腐植酸物种保护应该受益于有利于在古代森林中保留过成熟的林分的战略，促进具有较高数量和枯木异质性的地点。
Long temporal continuity in forests has been shown to influence biodiversity through dispersal and recruitment limitations. However, for motile taxa that depend on stand maturity attributes, these limitations may be less relevant. Moreover, while certain habitats may be created rapidly, the development of other habitats may take a long time. Forest continuity and stand maturity may therefore have additive effects on biodiversity. Understanding their relative influence on biodiversity is crucial for conservation. We explored the response of species and functional trait composition of saproxylic beetle assemblages using a balanced sampling design in which we crossed forest continuity (ancient vs recent) and stand maturity (mature vs overmature). We established forty plots in montane forests where we sampled beetles. Stand maturity, related to deadwood resources, induced a strong environmental filtering on both species and functional trait composition. Regardless of forest continuity, species preferring large wood of late decay stages were more abundant in overmature stands. Moreover, overmature stands enhanced the co-occurrence of different saproxylic beetles with contrasting resource requirements. Forest continuity interacting with stand maturity induced taxonomic and functional changes in communities. Compared to other forest types, overmature stands in ancient forests hosted assemblages with many more characteristic species, with a larger average body size and species that prefer large deadwood pieces. Finally, a greater diversity of body sizes was found in these forests. Saproxylic species conservation should therefore benefit from strategies that favor setting-aside overmature stands in ancient forests, promoting sites with higher amounts and heterogeneity of deadwood.