Header

UZH-Logo

Maintenance Infos

Evolution of density-dependent movement during experimental range expansions


Fronhofer, Emanuel A; Gut, Sereina; Altermatt, Florian (2017). Evolution of density-dependent movement during experimental range expansions. Journal of Evolutionary Biology, 30(12):2165-2176.

Abstract

Range expansions and biological invasions are prime examples of transient processes that are likely impacted by rapid evolutionary changes. As a spa- tial process, range expansions are driven by dispersal and movement beha- viour. Although it is widely accepted that dispersal and movement may be context-dependent, for instance density-dependent, and best represented by reaction norms, the evolution of density-dependent movement during range expansions has received little experimental attention. We therefore tested current theory predicting the evolution of increased movement at low den- sities at range margins using highly replicated and controlled range expan- sion experiments across multiple genotypes of the protist model system Tetrahymena thermophila. Although rare, we found evolutionary changes dur- ing range expansions even in the absence of initial standing genetic varia- tion. Range expansions led to the evolution of negatively density-dependent movement at range margins. In addition, we report the evolution of increased intrastrain competitive ability and concurrently decreased popula- tion growth rates in range cores. Our findings highlight the importance of understanding movement and dispersal as evolving reaction norms and plas- tic life-history traits of central relevance for range expansions, biological invasions and the dynamics of spatially structured systems in general.

Abstract

Range expansions and biological invasions are prime examples of transient processes that are likely impacted by rapid evolutionary changes. As a spa- tial process, range expansions are driven by dispersal and movement beha- viour. Although it is widely accepted that dispersal and movement may be context-dependent, for instance density-dependent, and best represented by reaction norms, the evolution of density-dependent movement during range expansions has received little experimental attention. We therefore tested current theory predicting the evolution of increased movement at low den- sities at range margins using highly replicated and controlled range expan- sion experiments across multiple genotypes of the protist model system Tetrahymena thermophila. Although rare, we found evolutionary changes dur- ing range expansions even in the absence of initial standing genetic varia- tion. Range expansions led to the evolution of negatively density-dependent movement at range margins. In addition, we report the evolution of increased intrastrain competitive ability and concurrently decreased popula- tion growth rates in range cores. Our findings highlight the importance of understanding movement and dispersal as evolving reaction norms and plas- tic life-history traits of central relevance for range expansions, biological invasions and the dynamics of spatially structured systems in general.

Statistics

Citations

Altmetrics

Downloads

7 downloads since deposited on 05 Jan 2018
7 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Uncontrolled Keywords:biological invasion, context-dependent dispersal, dispersal evolution, experimental evolution, movement, protist microcosm, Tetrahymena thermophila
Language:English
Date:December 2017
Deposited On:05 Jan 2018 20:24
Last Modified:18 Apr 2018 11:49
Publisher:Wiley-Blackwell Publishing, Inc.
ISSN:1010-061X
Funders:E.A.F. and F.A. thank Eawag and the Swiss National Science Foundation (grant no. PP00P3_150698 to FA) for funding.
OA Status:Green
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1111/jeb.13182
PubMed ID:28977712
Project Information:
  • : FunderSNSF
  • : Grant ID
  • : Project TitleE.A.F. and F.A. thank Eawag and the Swiss National Science Foundation (grant no. PP00P3_150698 to FA) for funding.

Download

Download PDF  'Evolution of density-dependent movement during experimental range expansions'.
Preview
Content: Accepted Version
Filetype: PDF
Size: 638kB
Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)