Diversity-stability relation from a methodological point of view
(English)Manuscript (Other academic)
The complexity - stability relation has been a central issue in ecology for a long time. Both theoretical and empirical studies have been investigating whether complexity promotes stability or not, which could be the underlying mechanisms creating a positive or negative cmnplexity-stability relation and which are the structures, characteristics and constraints that would allow complex ecological systems to persist and be stable. In this paper we approach the subject from amethodological point of view. We study the effect of parameterizing the communities in a certain way and illustrate the effect of treating feasibility (i.e. densities of all species are strictly positive) separately from stability. We observe that increasing number of species in the communities requires a more skewed interaction strength distribution toward weak interactions, in order for the communities to theoretically exist. Using model Lotka-Volterra competition communities we illustrate that probability of feasibility decreases with increasing interaction strength and number of species in the community. However, forfeasible systems we find that local stability probability and resilience do not significantly differ between communities with few or many species, in contrast with earlier studies that, did not account for feasibility and concluded that species poor communities had higher probability of being locally stable than species rich communities.
Local stability, resilience, feasibility, Lotka-Volterra model, competition community, Central Limit Theorem
IdentifiersURN: urn:nbn:se:liu:diva-14056OAI: oai:DiVA.org:liu-14056DiVA: diva2:22542
Alternative title: Complexity - Stability relation from a methodological point of view2006-10-042006-10-042012-11-14