Multiple peaks of species abundance distributions induced by sparse interactions

Autor:	Obuchi, Tomoyuki, Kabashima, Yoshiyuki, Tokita, Kei
Rok vydání:	2016
Předmět:	Quantitative Biology - Populations and Evolution Condensed Matter - Disordered Systems and Neural Networks Condensed Matter - Statistical Mechanics Physics - Physics and Society
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevE.94.022312
Popis:	We investigate the replicator dynamics with "sparse" symmetric interactions which represent specialist-specialist interactions in ecological communities. By considering a large self interaction $u$, we conduct a perturbative expansion which manifests that the nature of the interactions has a direct impact on the species abundance distribution. The central results are all species coexistence in a realistic range of the model parameters and that a certain discrete nature of the interactions induces multiple peaks in the species abundance distribution, providing the possibility of theoretically explaining multiple peaks observed in various field studies. To get more quantitative information, we also construct a non-perturbative theory which becomes exact on tree-like networks if all the species coexist, providing exact critical values of $u$ below which extinct species emerge. Numerical simulations in various different situations are conducted and they clarify the robustness of the presented mechanism of all species coexistence and multiple peaks in the species abundance distributions. Comment: 6 pages, 5 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1605.09106 Zobrazit plný text záznamu View this record from Arxiv