Intra-specific and inter-specific variation in specific leaf area reveal the importance of abiotic and biotic drivers of species diversity across elevation and latitude
Intra-specific and inter-specific variation in specific leaf area reveal the importance of abiotic and biotic drivers of species diversity across elevation and latitude
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DOI：
10.1111/jvs.12041
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发表时间：
2013-09-01
影响因子：
2.8
通讯作者：
Enquist, Brian J.
中科院分区：
文献类型：
--
作者：
Hulshof, Catherine M.;Violle, Cyrille;Enquist, Brian J.
问题：种内和种间功能性状变异的模式是否与高纬度和高海拔地区对群落组装的非生物过滤和低纬度和高海拔地区的生物过滤相一致？地点：瓜纳卡斯特保护区，哥斯达黎加，圣卡塔利纳山，亚利桑那州，锡斯基尤山，Oregon.Methods：我们测量了木本植物物种丰度和一个关键的功能性状与竞争的资源和环境的耐受性（比叶面积，SLA）沿着海拔梯度在低纬度热带（哥斯达黎加），中纬度沙漠（亚利桑那州）和高纬度地中海（南俄勒冈州）生物群系。我们探讨了模式的非生物和生物过滤比较观察到的模式，社区加权平均值和方差沿着海拔和纬度梯度下的随机组装。此外，我们与性状变异的生态位，并探讨如何总性状的空间和宽度在广泛的空间梯度变化，通过量化的比例内到种间variation.Results：整个社区的平均值和方差的SLA随着纬度的增加而下降，符合更大的非生物过滤在较高的纬度。此外，低海拔社区有更高的性状变异比预期的机会，符合更大的生物过滤在低海拔。最后，在热带和跨纬度的种内和种间变异的比例与物种丰富度呈负相关，这进一步表明，生物相互作用影响植物组装在低纬。结论：SLA的种内和种间变异模式出现了大致一致的想法，即生物和非生物驱动力的相对强度对群落组装的变化沿着海拔和纬度梯度;生物驱动因素的证据在低纬度和高海拔地区更为突出，非生物驱动因素的证据在高纬度和高海拔地区更为突出。
Questions: Are patterns of intra- and inter-specific functional trait variation consistent with greater abiotic filtering on community assembly at high latitudes and elevations, and greater biotic filtering at low latitudes and elevations?Locations: Area de Conservacion Guanacaste, Costa Rica; Santa Catalina Mountains, Arizona; Siskiyou Mountains, Oregon.Methods: We measured woody plant species abundance and a key functional trait associated with competition for resources and environmental tolerance (specific leaf area, SLA) along elevational gradients in low-latitude tropical (Costa Rica), mid-latitude desert (Arizona) and high latitude mediterranean (southern Oregon) biomes. We explored patterns of abiotic and biotic filtering by comparing observed patterns of community-weighted means and variances along elevational and latitudinal gradients to those expected under random assembly. In addition, we related trait variability to niches and explored how total trait space and breadth vary across broad spatial gradients by quantifying the ratio of intra- to inter-specific variation.Results: Both the community-wide mean and variance of SLA decreased with increasing latitude, consistent with greater abiotic filtering at higher latitudes. Further, low-elevation communities had higher trait variation than expected by chance, consistent with greater biotic filtering at low elevations. Finally, in the tropics and across latitude the ratio of intra-to inter-specific variation was negatively correlated to species richness, which further suggests that biotic interactions influence plant assembly at low latitudes.Conclusions: Intra- and inter-specific patterns of SLA variation appeared broadly consistent with the idea that the relative strength of biotic and abiotic drivers on community assembly changes along elevational and latitudinal gradients; evidence for biotic drivers appeared more prominent at low latitudes and elevations and evidence for abiotic drivers appearedmore prominent at high latitudes and elevations.