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Asymmetric competition causes multimodal size distributions in spatially structured populations

Velázquez, Jorge; Allen, Robert B.; Coomes, David A.; Eichhorn, Markus P.

Authors

Jorge Velázquez

Robert B. Allen

David A. Coomes

Markus P. Eichhorn



Abstract

Plant sizes within populations often exhibit multimodal distributions, even when all individuals are the same age and have experienced identical conditions. To establish the causes of this, we created an individual-based model simulating the growth of trees in a spatially explicit framework, which was parametrized using data from a long-term study of forest stands in New Zealand. First, we demonstrate that asymmetric resource competition is a
necessary condition for the formation of multimodal size distributions within cohorts. By contrast, the legacy of small-scale clustering during recruitment is transient and quickly overwhelmed by density-dependent mortality. Complex
multi-layered size distributions are generated when established individuals are restricted in the spatial domain within which they can capture resources. The number of modes reveals the effective number of direct competitors, while
the separation and spread of modes are influenced by distances among established individuals. Asymmetric competition within local neighbourhoods can therefore generate a range of complex size distributions within even-aged cohorts.

Citation

Velázquez, J., Allen, R. B., Coomes, D. A., & Eichhorn, M. P. (2016). Asymmetric competition causes multimodal size distributions in spatially structured populations. Proceedings of the Royal Society B: Biological Sciences, 283(1823), 20152404. https://doi.org/10.1098/rspb.2015.2404

Journal Article Type Article
Acceptance Date Nov 30, 2015
Online Publication Date Jan 27, 2016
Publication Date Jan 27, 2016
Deposit Date Feb 4, 2016
Publicly Available Date Feb 4, 2016
Journal Proceedings of the Royal Society B: Biological Sciences
Print ISSN 0962-8452
Electronic ISSN 1471-2954
Publisher Royal Society, The
Peer Reviewed Peer Reviewed
Volume 283
Issue 1823
Pages 20152404
DOI https://doi.org/10.1098/rspb.2015.2404
Keywords bimodality, individual-based model, forests, Fuscospora cliffortioides, southern beech, zone-of-influence
Public URL http://eprints.nottingham.ac.uk/id/eprint/31516
Publisher URL http://rspb.royalsocietypublishing.org/content/283/1823/20152404
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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