2026-02-17 マックス・プランク研究所
An AI-generated image: Panoramic scientific illustration of biodiversity dynamics, featuring a rank–abundance curve, population fluctuations, interaction networks, and steady immigration (no text). ChatGPT.© ChatGPT
<関連情報>
- https://www.mpg.de/26148326/big-pattern-small-model
- https://onlinelibrary.wiley.com/doi/10.1111/ele.70333
変動する成長率は、種の豊富なコミュニティにおける入れ替わりと不均衡を結び付ける Fluctuating Growth Rates Link Turnover and Unevenness in Species-Rich Communities
Emil Mallmin, Arne Traulsen, Silvia De Monte
Ecology Letters Published: 12 February 2026
DOI:https://doi.org/10.1111/ele.70333
ABSTRACT
The maintenance of diversity, the ‘commonness of rarity’, and compositional turnover are ubiquitous features of species-rich communities. Through a minimal model, we consider how these features reflect the interplay between environmental stochasticity, intra- and interspecific competition, and dispersal. We show that, even if species have the same time-average fitness, fluctuations tend to drive the community towards ever-growing unevenness and species extinctions, but self-limitation and/or dispersal allow species-rich states to be sustained. Species abundance–distributions vary systematically in a Buffering–Stabilisation parameter plane that describes the relative strength of the underlying ecological processes, and cover different empirically relevant power-law and unimodal shapes. A model describing the effective dynamics of a focal species relates static abundance distributions with turnover dynamics, also when species have different mean fitness. The model suggests how community statistics and time series of individual species can inform on the relative importance of the ecological processes that structure diversity.
