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Density dependent dispersal decisions and the Allee effect

Mike Fowler Orcid Logo

Oikos, Volume: 118, Issue: 4

Swansea University Author: Mike Fowler Orcid Logo

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DOI (Published version): 10.1111/j.1600-0706.2009.17321.x

Abstract

The decision to move between patches in the environment is among the most important life history choices an organism can make. I derive a new density dependent dispersal rule, and examine how dispersal decisions based on avoiding fitness loss associated with an Allee effect or competitive effects im...

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Published in: Oikos
ISSN: 0030-1299 1600-0706
Published: 2009
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa14879
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first_indexed 2013-07-23T12:13:03Z
last_indexed 2018-02-09T04:46:32Z
id cronfa14879
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spelling 2013-06-13T09:45:19.2987771 v2 14879 2013-05-23 Density dependent dispersal decisions and the Allee effect a3a29027498d4b43a3f082a0a5ba16b4 0000-0003-1544-0407 Mike Fowler Mike Fowler true false 2013-05-23 SBI The decision to move between patches in the environment is among the most important life history choices an organism can make. I derive a new density dependent dispersal rule, and examine how dispersal decisions based on avoiding fitness loss associated with an Allee effect or competitive effects impact upon population dynamics in spatially structured populations with qualitatively different dynamics. I also investigate the effects of the number of patches in the system and a limit to the patch sampling time available to dispersers. Dispersing to avoid competitive pressures can destabilise otherwise stable population dynamics, and stabilise chaotic dynamics. Dispersing to avoid an Allee effect does not qualitatively change local population dynamics until eventually driving unstable populations to global extinction with a sufficiently high fitness threshold. A time limit for sampling can stabilise dynamics if dispersal is based on escaping the Allee effect, and rescue populations from global extinction. The results are sensitive to the number of patches available in the environment and suggest that dispersal to avoid an Allee effect will only arise under biologically plausible conditions, i.e. where there is a limit to the number of dispersal attempts that can be made between generations. Journal Article Oikos 118 4 614 0030-1299 1600-0706 31 12 2009 2009-12-31 10.1111/j.1600-0706.2009.17321.x COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University 2013-06-13T09:45:19.2987771 2013-05-23T12:31:48.4956299 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Mike Fowler 0000-0003-1544-0407 1
title Density dependent dispersal decisions and the Allee effect
spellingShingle Density dependent dispersal decisions and the Allee effect
Mike Fowler
title_short Density dependent dispersal decisions and the Allee effect
title_full Density dependent dispersal decisions and the Allee effect
title_fullStr Density dependent dispersal decisions and the Allee effect
title_full_unstemmed Density dependent dispersal decisions and the Allee effect
title_sort Density dependent dispersal decisions and the Allee effect
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 118
container_issue 4
publishDate 2009
institution Swansea University
issn 0030-1299
1600-0706
doi_str_mv 10.1111/j.1600-0706.2009.17321.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 decision to move between patches in the environment is among the most important life history choices an organism can make. I derive a new density dependent dispersal rule, and examine how dispersal decisions based on avoiding fitness loss associated with an Allee effect or competitive effects impact upon population dynamics in spatially structured populations with qualitatively different dynamics. I also investigate the effects of the number of patches in the system and a limit to the patch sampling time available to dispersers. Dispersing to avoid competitive pressures can destabilise otherwise stable population dynamics, and stabilise chaotic dynamics. Dispersing to avoid an Allee effect does not qualitatively change local population dynamics until eventually driving unstable populations to global extinction with a sufficiently high fitness threshold. A time limit for sampling can stabilise dynamics if dispersal is based on escaping the Allee effect, and rescue populations from global extinction. The results are sensitive to the number of patches available in the environment and suggest that dispersal to avoid an Allee effect will only arise under biologically plausible conditions, i.e. where there is a limit to the number of dispersal attempts that can be made between generations.
published_date 2009-12-31T03:17:01Z
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score 11.037581

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