Agricultural Food Subsidies, Migratory Connectivity and Large-Scale Disturbance in Arctic Coastal Systems: A Case Study
An allochthonous input can modify trophic relationships, by providing an external resource that is normally limiting within a system. The subsidy may not only elicit a growth response of the primary producers via a bottom-up effect, but it also may lead to runaway herbivore growth in the absence of...
Published in: | Integrative and Comparative Biology |
---|---|
Main Authors: | , , |
Format: | Text |
Language: | English |
Published: |
Oxford University Press
2004
|
Subjects: | |
Online Access: | http://icb.oxfordjournals.org/cgi/content/short/44/2/130 https://doi.org/10.1093/icb/44.2.130 |
id |
fthighwire:oai:open-archive.highwire.org:icbiol:44/2/130 |
---|---|
record_format |
openpolar |
spelling |
fthighwire:oai:open-archive.highwire.org:icbiol:44/2/130 2023-05-15T15:06:01+02:00 Agricultural Food Subsidies, Migratory Connectivity and Large-Scale Disturbance in Arctic Coastal Systems: A Case Study Jefferies, R. L. Rockwell, R. F. Abraham, K. F. 2004-04-01 00:00:00.0 text/html http://icb.oxfordjournals.org/cgi/content/short/44/2/130 https://doi.org/10.1093/icb/44.2.130 en eng Oxford University Press http://icb.oxfordjournals.org/cgi/content/short/44/2/130 http://dx.doi.org/10.1093/icb/44.2.130 Copyright (C) 2004, The Society for Integrative and Comparative Biology Regular Article TEXT 2004 fthighwire https://doi.org/10.1093/icb/44.2.130 2007-06-24T02:28:03Z An allochthonous input can modify trophic relationships, by providing an external resource that is normally limiting within a system. The subsidy may not only elicit a growth response of the primary producers via a bottom-up effect, but it also may lead to runaway herbivore growth in the absence of increased predation. If the consumer is migratory and predation is similarly dampened in the alternative system, the increased numbers may produce a top-down cascade of direct and indirect effects on an ecosystem that may be a great distance from the source of the subsidy. In an extreme case, it can lead to a catastrophic shift in ecosystem functioning as a result of biotic exploitation that produces an alternative stable state. The loss of resilience is particularly sensitive to herbivore density which can result in two different outcomes to the vegetation on which the consumer feeds. Over-compensatory growth of above-ground biomass gives way to sward destruction and near irreversible changes in soil properties as density of a herbivore increases. A striking temporal asymmetry exists between a reduction in the consumer population and recovery of damaged vegetation and degraded soils. Text Arctic HighWire Press (Stanford University) Arctic Integrative and Comparative Biology 44 2 130 139 |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
Regular Article |
spellingShingle |
Regular Article Jefferies, R. L. Rockwell, R. F. Abraham, K. F. Agricultural Food Subsidies, Migratory Connectivity and Large-Scale Disturbance in Arctic Coastal Systems: A Case Study |
topic_facet |
Regular Article |
description |
An allochthonous input can modify trophic relationships, by providing an external resource that is normally limiting within a system. The subsidy may not only elicit a growth response of the primary producers via a bottom-up effect, but it also may lead to runaway herbivore growth in the absence of increased predation. If the consumer is migratory and predation is similarly dampened in the alternative system, the increased numbers may produce a top-down cascade of direct and indirect effects on an ecosystem that may be a great distance from the source of the subsidy. In an extreme case, it can lead to a catastrophic shift in ecosystem functioning as a result of biotic exploitation that produces an alternative stable state. The loss of resilience is particularly sensitive to herbivore density which can result in two different outcomes to the vegetation on which the consumer feeds. Over-compensatory growth of above-ground biomass gives way to sward destruction and near irreversible changes in soil properties as density of a herbivore increases. A striking temporal asymmetry exists between a reduction in the consumer population and recovery of damaged vegetation and degraded soils. |
format |
Text |
author |
Jefferies, R. L. Rockwell, R. F. Abraham, K. F. |
author_facet |
Jefferies, R. L. Rockwell, R. F. Abraham, K. F. |
author_sort |
Jefferies, R. L. |
title |
Agricultural Food Subsidies, Migratory Connectivity and Large-Scale Disturbance in Arctic Coastal Systems: A Case Study |
title_short |
Agricultural Food Subsidies, Migratory Connectivity and Large-Scale Disturbance in Arctic Coastal Systems: A Case Study |
title_full |
Agricultural Food Subsidies, Migratory Connectivity and Large-Scale Disturbance in Arctic Coastal Systems: A Case Study |
title_fullStr |
Agricultural Food Subsidies, Migratory Connectivity and Large-Scale Disturbance in Arctic Coastal Systems: A Case Study |
title_full_unstemmed |
Agricultural Food Subsidies, Migratory Connectivity and Large-Scale Disturbance in Arctic Coastal Systems: A Case Study |
title_sort |
agricultural food subsidies, migratory connectivity and large-scale disturbance in arctic coastal systems: a case study |
publisher |
Oxford University Press |
publishDate |
2004 |
url |
http://icb.oxfordjournals.org/cgi/content/short/44/2/130 https://doi.org/10.1093/icb/44.2.130 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
http://icb.oxfordjournals.org/cgi/content/short/44/2/130 http://dx.doi.org/10.1093/icb/44.2.130 |
op_rights |
Copyright (C) 2004, The Society for Integrative and Comparative Biology |
op_doi |
https://doi.org/10.1093/icb/44.2.130 |
container_title |
Integrative and Comparative Biology |
container_volume |
44 |
container_issue |
2 |
container_start_page |
130 |
op_container_end_page |
139 |
_version_ |
1766337684263927808 |