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Extinctions in competitive communities forced by coloured environmental variation / Lasse Ruokolainen; Mike Fowler; Esa Ranta

Oikos, Volume: 116, Issue: 3

Swansea University Author: Mike, Fowler

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Abstract

Understanding the relationships between environmental fluctuations, population dynamics and species interactions in natural communities is of vital theoretical and practical importance. This knowledge is essential in assessing extinction risks in communities that are, for example, pressed by changin...

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Published in: Oikos
ISSN: 0030-1299 1600-0706
Published: 2007
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URI: https://cronfa.swan.ac.uk/Record/cronfa14884
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first_indexed 2013-07-23T12:13:04Z
last_indexed 2018-02-09T04:46:32Z
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spelling 2013-06-13T09:46:15.0987713 v2 14884 2013-05-23 Extinctions in competitive communities forced by coloured environmental variation a3a29027498d4b43a3f082a0a5ba16b4 0000-0003-1544-0407 Mike Fowler Mike Fowler true false 2013-05-23 SBI Understanding the relationships between environmental fluctuations, population dynamics and species interactions in natural communities is of vital theoretical and practical importance. This knowledge is essential in assessing extinction risks in communities that are, for example, pressed by changing environmental conditions and increasing exploitation. We developed a model of density dependent population renewal, in a Lotka–Volterra competitive community context, to explore the significance of interspecific interactions, demographic stochasticity, population growth rate and species abundance on extinction risk in populations under various autocorrelation (colour) regimes of environmental forcing. These factors were evaluated in two cases, where either a single species or the whole community was affected by the external forcing. Species’ susceptibility to environmental noise with different autocorrelation structure depended markedly on population dynamics, species’ position in the abundance hierarchy and how similarly community members responded to external forcing. We also found interactions between demographic stochasticity and environmental noise leading to a reversal in extinction probabilities from under- to overcompensatory dynamics. We compare our results with studies of single species populations and contrast possible mechanisms leading to extinctions. Our findings indicate that abundance rank, the form of population dynamics, and the colour of environmental variation interact in affecting species extinction risk. These interactions are further modified by interspecific interactions within competitive communities as the interactions filter and modulate the environmental noise. Journal Article Oikos 116 3 448 0030-1299 1600-0706 31 12 2007 2007-12-31 10.1111/j.2006.0030-1299.15586.x COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University 2013-06-13T09:46:15.0987713 2013-05-23T12:42:09.1679003 College of Science Biosciences Lasse Ruokolainen 1 Mike Fowler 0000-0003-1544-0407 2 Esa Ranta 3
title Extinctions in competitive communities forced by coloured environmental variation
spellingShingle Extinctions in competitive communities forced by coloured environmental variation
Mike, Fowler
title_short Extinctions in competitive communities forced by coloured environmental variation
title_full Extinctions in competitive communities forced by coloured environmental variation
title_fullStr Extinctions in competitive communities forced by coloured environmental variation
title_full_unstemmed Extinctions in competitive communities forced by coloured environmental variation
title_sort Extinctions in competitive communities forced by coloured environmental variation
author_id_str_mv a3a29027498d4b43a3f082a0a5ba16b4
author_id_fullname_str_mv a3a29027498d4b43a3f082a0a5ba16b4_***_Mike, Fowler
author Mike, Fowler
author2 Lasse Ruokolainen
Mike Fowler
Esa Ranta
format Journal article
container_title Oikos
container_volume 116
container_issue 3
publishDate 2007
institution Swansea University
issn 0030-1299
1600-0706
doi_str_mv 10.1111/j.2006.0030-1299.15586.x
college_str College of Science
hierarchytype
hierarchy_top_id collegeofscience
hierarchy_top_title College of Science
hierarchy_parent_id collegeofscience
hierarchy_parent_title College of Science
department_str Biosciences{{{_:::_}}}College of Science{{{_:::_}}}Biosciences
document_store_str 0
active_str 0
description Understanding the relationships between environmental fluctuations, population dynamics and species interactions in natural communities is of vital theoretical and practical importance. This knowledge is essential in assessing extinction risks in communities that are, for example, pressed by changing environmental conditions and increasing exploitation. We developed a model of density dependent population renewal, in a Lotka–Volterra competitive community context, to explore the significance of interspecific interactions, demographic stochasticity, population growth rate and species abundance on extinction risk in populations under various autocorrelation (colour) regimes of environmental forcing. These factors were evaluated in two cases, where either a single species or the whole community was affected by the external forcing. Species’ susceptibility to environmental noise with different autocorrelation structure depended markedly on population dynamics, species’ position in the abundance hierarchy and how similarly community members responded to external forcing. We also found interactions between demographic stochasticity and environmental noise leading to a reversal in extinction probabilities from under- to overcompensatory dynamics. We compare our results with studies of single species populations and contrast possible mechanisms leading to extinctions. Our findings indicate that abundance rank, the form of population dynamics, and the colour of environmental variation interact in affecting species extinction risk. These interactions are further modified by interspecific interactions within competitive communities as the interactions filter and modulate the environmental noise.
published_date 2007-12-31T03:24:29Z
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