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Extinction cascades and the distribution of species interactions

Mike Fowler Orcid Logo

Oikos, Volume: 119, Issue: 5

Swansea University Author: Mike Fowler Orcid Logo

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DOI (Published version): 10.1111/j.1600-0706.2009.17817.x

Abstract

The distribution of interaction strengths among community members has important consequences for assembly processes and community responses to perturbations. Species deletion from communities can trigger cascading extinction events, with strong evidence from empirical and theoretical work. I examine...

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Published in: Oikos
ISSN: 0030-1299
Published: 2010
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URI: https://cronfa.swan.ac.uk/Record/cronfa14877
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first_indexed 2013-07-23T12:13:03Z
last_indexed 2018-02-09T04:46:32Z
id cronfa14877
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spelling 2013-06-13T09:44:49.1189073 v2 14877 2013-05-23 Extinction cascades and the distribution of species interactions a3a29027498d4b43a3f082a0a5ba16b4 0000-0003-1544-0407 Mike Fowler Mike Fowler true false 2013-05-23 SBI The distribution of interaction strengths among community members has important consequences for assembly processes and community responses to perturbations. Species deletion from communities can trigger cascading extinction events, with strong evidence from empirical and theoretical work. I examined model competitive communities, sequentially assembled using species drawn from a global pool with interaction strengths described by different distribution shapes (uniform or beta), with the same mean and variance. As community size increased, it became harder to assemble communities drawn from a uniform distribution compared to a beta distribution. The distribution of interaction values in the assembled communities differed from the shape of the initial distribution. The distribution shape and the relative abundance of the deleted species also had strong impacts on the probability of extinction cascades following primary species removal. Extinction cascades occurred in communities with a higher mean and variance of interaction strengths before the primary extinction. Those species lost had negative equilibrium densities and tended to be the least abundant, when assessed following the reorganisation that occurred after the primary and subsequent extinctions. Knowledge of the shape of the distribution of interaction strengths from real communities will allow us to make better predictions about which species are most at risk in extinction cascades under natural circumstances. Journal Article Oikos 119 5 873 0030-1299 31 12 2010 2010-12-31 10.1111/j.1600-0706.2009.17817.x COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University 2013-06-13T09:44:49.1189073 2013-05-23T12:25:21.9075433 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Mike Fowler 0000-0003-1544-0407 1
title Extinction cascades and the distribution of species interactions
spellingShingle Extinction cascades and the distribution of species interactions
Mike Fowler
title_short Extinction cascades and the distribution of species interactions
title_full Extinction cascades and the distribution of species interactions
title_fullStr Extinction cascades and the distribution of species interactions
title_full_unstemmed Extinction cascades and the distribution of species interactions
title_sort Extinction cascades and the distribution of species interactions
author_id_str_mv a3a29027498d4b43a3f082a0a5ba16b4
author_id_fullname_str_mv a3a29027498d4b43a3f082a0a5ba16b4_***_Mike Fowler
author Mike Fowler
author2 Mike Fowler
format Journal article
container_title Oikos
container_volume 119
container_issue 5
publishDate 2010
institution Swansea University
issn 0030-1299
doi_str_mv 10.1111/j.1600-0706.2009.17817.x
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 0
active_str 0
description The distribution of interaction strengths among community members has important consequences for assembly processes and community responses to perturbations. Species deletion from communities can trigger cascading extinction events, with strong evidence from empirical and theoretical work. I examined model competitive communities, sequentially assembled using species drawn from a global pool with interaction strengths described by different distribution shapes (uniform or beta), with the same mean and variance. As community size increased, it became harder to assemble communities drawn from a uniform distribution compared to a beta distribution. The distribution of interaction values in the assembled communities differed from the shape of the initial distribution. The distribution shape and the relative abundance of the deleted species also had strong impacts on the probability of extinction cascades following primary species removal. Extinction cascades occurred in communities with a higher mean and variance of interaction strengths before the primary extinction. Those species lost had negative equilibrium densities and tended to be the least abundant, when assessed following the reorganisation that occurred after the primary and subsequent extinctions. Knowledge of the shape of the distribution of interaction strengths from real communities will allow us to make better predictions about which species are most at risk in extinction cascades under natural circumstances.
published_date 2010-12-31T03:17:01Z
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score 11.016235

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