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Character Displacement Through an Evolutionary Change in Ontogenetic Niche Shifts
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  • Jaime Anaya-Rojas,
  • Ronald Bassar,
  • Blake Matthews,
  • Joshua Goldberg,
  • David Reznick,
  • Joseph Travis
Jaime Anaya-Rojas
University of Münster Institute of Evolution and Biodiversity
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Ronald Bassar
Williams College
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Blake Matthews
Eawag
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Joshua Goldberg
University of California Riverside
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David Reznick
University of California Riverside
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Joseph Travis
Florida State University
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Abstract

In communities structured by body size, coexistence can occur through combinations of ontogenetic changes in competitive ability and dietary niche. Using stable isotopes, we examined ontogenetic niche shifts in Trinidadian guppies (Poecilia reticulata) and killifish (Rivulus hartii) in three types of natural communities (both species with predators, KGP; both without predators, KG; killifish only, KO) and four experimental KG communities, initiated with KGP guppies and KO killifish between 13 and 45 years ago. In all communities, killifish occupied higher trophic positions and changed their diet (δ^13 C) with body size. Only KGP guppies displayed an ontogenetic niche shift. The KG guppies displayed a significant difference in trophic niche from KGP guppies, a character displacement that can facilitate coexistence with killifish. In the experimental communities, the guppy trophic niche was intermediate between those in KGP and KG communities, indicating that evolution has driven the niche shift in KG guppies.

Peer review status:UNDER REVIEW

20 May 2021Submitted to Ecology Letters
21 May 2021Assigned to Editor
21 May 2021Submission Checks Completed
30 May 2021Reviewer(s) Assigned