How similar can co-occurring species be in the presence of competition and ecological drift?

Capitán Gómez, José Ángel and Cuenda, Sara and Alonso Giménez, David (2015). How similar can co-occurring species be in the presence of competition and ecological drift?. "Journal of the Royal Society interface", v. 12 (n. 110); ISSN 1742-5662. https://doi.org/10.1098/rsif.2015.0604.

Description

Title: How similar can co-occurring species be in the presence of competition and ecological drift?
Author/s:
  • Capitán Gómez, José Ángel
  • Cuenda, Sara
  • Alonso Giménez, David
Item Type: Article
Título de Revista/Publicación: Journal of the Royal Society interface
Date: September 2015
ISSN: 1742-5662
Volume: 12
Subjects:
Freetext Keywords: Community ecology; Competitive exclusio; Species coexistence;Limiting similarity; Ecological drift
Faculty: E.T.S. de Edificación (UPM)
Department: Matemática Aplicada
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

If two species live on a single resource, the one with a slight advantage will out-compete the other: complete competitors cannot coexist. This is known as the competitive exclusion principle. If no extinction occurs, it is because evolutionary adaptation to slightly different niches takes place. Therefore, it is widely accepted that ecological communities are assembled by evolutionary differentiation and progressive adaptation of species to different niches. However, some ecologists have recently challenged this classic paradigm highlighting the importance of chance and stochasticity. Using a synthetic framework for community dynamics, here we show that, while deterministic descriptors predict coexistence, species similarity is limited in a more restrictive way in the presence of stochasticity. We analyse the stochastic extinction phenomenon, showing that extinction occurs as competitive overlap increases above a certain threshold well below its deterministic counterpart. We also prove that the extinction threshold cannot be ascribed only to demographic fluctuations around small population sizes. The more restrictive limit to species similarity is, therefore, a consequence of the complex interplay between competitive interactions and ecological drift. As a practical implication, we show that the existence of a stochastic limit to similarity has important consequences in the recovery of fragmented habitats.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainCGL2012-39964UnspecifiedCSICDesarrollo de modelos teóricos de biodiversidad y distribución de especies: funciones de incidencia generalizada

More information

Item ID: 44845
DC Identifier: http://oa.upm.es/44845/
OAI Identifier: oai:oa.upm.es:44845
DOI: 10.1098/rsif.2015.0604
Official URL: http://rsif.royalsocietypublishing.org/content/12/110/20150604
Deposited by: Memoria Investigacion
Deposited on: 06 Mar 2017 15:34
Last Modified: 06 Mar 2017 15:34
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