Determinants of species abundance for eastern North American trees

被引:13
|
作者
Xing, Dingliang [1 ,2 ]
Swenson, Nathan G. [3 ]
Weiser, Michael D. [4 ]
Hao, Zhanqing [1 ]
机构
[1] Chinese Acad Sci, State Key Lab Forest & Soil Ecol, Inst Appl Ecol, Shenyang 110164, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Michigan State Univ, Dept Plant Biol, E Lansing, MI 48824 USA
[4] Univ Oklahoma, Dept Biol, Norman, OK 73019 USA
来源
GLOBAL ECOLOGY AND BIOGEOGRAPHY | 2014年 / 23卷 / 08期
基金
美国国家科学基金会; 中国国家自然科学基金;
关键词
Dispersal limitation; environmental filtering; functional traits; maximum entropy; metacommunity; plant geography; species relative abundance; PLANT TRAITS; FUNCTIONAL TRAITS; GLOBAL PATTERNS; RELATIVE ABUNDANCE; AREA RELATIONSHIPS; DIVERSITY; POOLS; NICHE; COMMUNITIES; COEXISTENCE;
D O I
10.1111/geb.12167
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Aim We aimed to quantify the relative contributions of trait-based selection and the flow of individuals across space created by differences in species abundance, i.e. mass effects, in determining local-scale species relative abundance (SRA) at 0.07 ha, 1 grid cell and subregion grains. Location The eastern USA. Methods We coupled a maximum entropy model (MaxEnt) with nine species-specific plant traits and a continental-scale forest inventory dataset to perform our analyses. Mass effects were estimated using the next grain size up as the metacommunity (or the eastern USA at the subregion grain, and also at the 1 degrees grid cell grain in a fourth analysis). Permutation tests were conducted to test the significance of trait constraints. The Kullback-Leibler divergence index was used to decompose the information content in each assemblage SRA. Results Trait constraints were significant in predicting community structures at coarse scales, but were largely not significant at fine or medium scales. At the 0.07 ha grain little of the variation in local SRA can be explained by either trait constraints or a regional SRA. At the 1 degrees grain c. 61% of the variation could be accounted for by a regional SRA represented by subregions. At the subregion grain c. 74% of the variation could be accounted for by trait constraints and the SRA of the entire study area. Main conclusions Our results suggest that the relative importance of community assembly processes is scale dependent. Estimated mass effects predominated at small spatial scales where environmental gradients were weak. Trait-based selection was hard to detect at small scales and was strongest at large scales where environmental gradients are stronger. The fact that, at all scales, mass effects accounted for more variation in assemblage SRA than trait-based selection in our analyses suggests that regional processes are important in determining community structures more locally.
引用
收藏
页码:903 / 911
页数:9
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