title: The effects of asymmetric competition on the life history of Trinidadian guppies.
abstract: The effects of asymmetric interactions on population dynamics has been widely investigated, but there has been little work aimed at understanding how life history parameters like generation time, life expectancy and the variance in lifetime reproductive success are impacted by different types of competition. We develop a new framework for incorporating trait-mediated density-dependence into size-structured models and use Trinidadian guppies to show how different types of competitive interactions impact life history parameters. Our results show the degree of symmetry in competitive interactions can have dramatic effects on the speed of the life history. For some vital rates, shifting the competitive superiority from small to large individuals resulted in a doubling of the generation time. Such large influences of competitive symmetry on the timescale of demographic processes, and hence evolution, highlights the interwoven nature of ecological and evolutionary processes and the importance of density-dependence in understanding eco-evolutionary dynamics.
authors: Department of Zoology, University of Oxford, South Parks Road, Oxford, OX1 3PS, UK.
authors: Ronald D
authors: RD
authors: Bassar
authors: Department of Animal and Plant Sciences, University of Sheffield, Sheffield, UK.
authors: Dylan Z
authors: DZ
authors: Childs
authors: Department of Animal and Plant Sciences, University of Sheffield, Sheffield, UK.
authors: Mark
authors: M
authors: Rees
authors: Department of Biology, Stanford University, Palo Alto, CA, USA.
authors: Shripad
authors: S
authors: Tuljapurkar
authors: Department of Biology, University of California, Riverside, CA, USA.
authors: David N
authors: DN
authors: Reznick
authors: Department of Zoology, University of Oxford, South Parks Road, Oxford, OX1 3PS, UK.
authors: Tim
authors: T
authors: Coulson
mesh_terms: D000818:Animals; D003163:Competitive Behavior; D005260:Female; D008954:Models, Biological; D011036:Poecilia / Q000502:physiology*; D011157:Population Dynamics
keywords: Asymmetrical competition; contest competition; integral projection model; interaction surface; mesocosm; scramble competition; symmetrical competition