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Multi-species coexistence in Lotka-Volterra competitive systems with crowding effects.

Abstract：

:Classical Lotka-Volterra (LV) competition equation has shown that coexistence of competitive species is only possible when intraspecific competition is stronger than interspecific competition, i.e., the species inhibit their own growth more than the growth of the other species. Note that density effect is assumed to be linear in a classical LV equation. In contrast, in wild populations we can observed that mortality rate often increases when population density is very high, known as crowding effects. Under this perspective, the aggregation models of competitive species have been developed, adding the additional reduction in growth rates at high population densities. This study shows that the coexistence of a few species is promoted. However, an unsolved question is the coexistence of many competitive species often observed in natural communities. Here, we build an LV competition equation with a nonlinear crowding effect. Our results show that under a weak crowding effect, stable coexistence of many species becomes plausible, unlike the previous aggregation model. An analysis indicates that increased mortality rate under high density works as elevated intraspecific competition leading to the coexistence. This may be another mechanism for the coexistence of many competitive species leading high species diversity in nature.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Gavina MKA,Tahara T,Tainaka KI,Ito H,Morita S,Ichinose G,Okabe T,Togashi T,Nagatani T,Yoshimura J

doi

10.1038/s41598-017-19044-9

subject

Has Abstract

pub_date

2018-01-19 00:00:00

pages

1198

issue

1

issn

2045-2322

pii

10.1038/s41598-017-19044-9

journal_volume

8

pub_type

杂志文章

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