Bohn Kristin, Pavlick Ryan, Reu Björn, Kleidon Axel
Biospheric Theory and Modelling Group, Max Planck Institute for Biogeochemistry, Jena, Germany; Ecological Modelling, Friedrich-Schiller-University, Jena, Germany.
Biospheric Theory and Modelling Group, Max Planck Institute for Biogeochemistry, Jena, Germany.
PLoS One. 2014 Apr 24;9(4):e95659. doi: 10.1371/journal.pone.0095659. eCollection 2014.
Disturbance is a key factor shaping species abundance and diversity in plant communities. Here, we use a mechanistic model of vegetation diversity to show that different strengths of r- and K-selection result in different disturbance-diversity relationships. R- and K-selection constrain the range of viable species through the colonization-competition tradeoff, with strong r-selection favoring colonizers and strong K-selection favoring competitors, but the level of disturbance also affects the success of species. This interplay among r- and K-selection and disturbance results in different shapes of disturbance-diversity relationships, with little variation of diversity with no r- and no K-selection, a decrease in diversity with r-selection with disturbance rate, an increase in diversity with K-selection, and a peak at intermediate values with strong r- and K-selection. We conclude that different disturbance-diversity relationships found in observations may reflect different intensities of r- and K-selection within communities, which should be inferable from broader observations of community composition and their ecophysiological trait ranges.
干扰是塑造植物群落物种丰度和多样性的关键因素。在此，我们使用一个植被多样性的机理模型来表明，不同强度的r-选择和K-选择会导致不同的干扰-多样性关系。r-选择和K-选择通过定居-竞争权衡来限制可行物种的范围，强r-选择有利于定居者，强K-选择有利于竞争者，但干扰水平也会影响物种的成功。r-选择、K-选择和干扰之间的这种相互作用导致了不同形状的干扰-多样性关系，在没有r-选择和K-选择时多样性变化很小，随着干扰率的增加r-选择导致多样性降低，K-选择导致多样性增加，而在强r-选择和K-选择时多样性在中间值处达到峰值。我们得出结论，在观测中发现的不同干扰-多样性关系可能反映了群落内r-选择和K-选择的不同强度，这应该可以从对群落组成及其生态生理特征范围的更广泛观测中推断出来。
