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Emergent niche structuring leads to increased differences from neutrality in species abundance distributions
Univ Michigan, MI 48109 USA; Tulane Univ, LA 70118 USA.
Univ Michigan, MI 48109 USA; Univ Illinois, IL 61801 USA.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Teoretisk Biologi. Linköpings universitet, Tekniska fakulteten. Univ Michigan, MI 48109 USA.
Univ Michigan, MI 48109 USA.
2018 (engelsk)Inngår i: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 99, nr 7, s. 1633-1643Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Species abundance distributions must reflect the dynamic processes involved in community assembly, but whether and when specific processes lead to distinguishable signals is not well understood. Biodiversity and species abundances may be shaped by a variety of influences, but particular attention has been paid to competition, which can involve neutral dynamics, where competitor abundances are governed only by demographic stochasticity and immigration, and dynamics driven by trait differences that enable stable coexistence through the formation of niches. Key recent studies of the species abundance patterns of communities with niches employ simple models with pre-imposed niche structure. These studies suggest that species abundance distributions are insensitive to the relative contributions of niche and neutral processes, especially when diversity is much higher than the number of niches. Here we analyze results from a stochastic population model with competition driven by trait differences. With this model, niche structure emerges as clumps of species that persist along the trait axis, and leads to more substantial differences from neutral species abundance distributions than have been previously shown. We show that heterogeneity in between-niche interaction strength (i.e., in the strength of competition between species in different niches) plays the dominant role in shaping the species abundances along the trait axis, acting as a biotic filter favoring species at the centers of niches. Furthermore, we show that heterogeneity in within-niche interactions (i.e., in the competition between species in the same niche) counteracts the influence of heterogeneity in between-niche interactions on the SAD to some degree. Our results suggest that competitive interactions that produce niches can also influence the shapes of SADs.

sted, utgiver, år, opplag, sider
WILEY , 2018. Vol. 99, nr 7, s. 1633-1643
Emneord [en]
coexistence; community assembly; competition; Lotka-Volterra model; neutral theory; trait axis
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-149687DOI: 10.1002/ecy.2238ISI: 000436869900013PubMedID: 29655259OAI: oai:DiVA.org:liu-149687DiVA, id: diva2:1234450
Merknad

Funding Agencies|National Science Foundation - Advancing Theory in Biology program [1038678]; National Science Foundation [OCI-1053575]; Tulane Center for Computational Science

Tilgjengelig fra: 2018-07-24 Laget: 2018-07-24 Sist oppdatert: 2018-08-14

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