Can reduced predation offset negative effects of sea louse parasites on chum salmon?
The impact of parasites on hosts is invariably negative when considered in isolation, but may be complex and unexpected in nature. For example, if parasites make hosts less desirable to predators then gains from reduced predation may offset direct costs of being parasitized. We explore these ideas i...
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ftpubmed:oai:pubmedcentral.nih.gov:3871327 2023-05-15T17:59:37+02:00 Can reduced predation offset negative effects of sea louse parasites on chum salmon? Peacock, Stephanie J. Connors, Brendan M. Krkošek, Martin Irvine, James R. Lewis, Mark A. 2014-02-07 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3871327 http://www.ncbi.nlm.nih.gov/pubmed/24352951 https://doi.org/10.1098/rspb.2013.2913 en eng The Royal Society http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3871327 http://www.ncbi.nlm.nih.gov/pubmed/24352951 http://dx.doi.org/10.1098/rspb.2013.2913 http://creativecommons.org/licenses/by/3.0/ © 2013 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, provided the original author and source are credited. CC-BY Research Articles Text 2014 ftpubmed https://doi.org/10.1098/rspb.2013.2913 2014-02-09T01:30:26Z The impact of parasites on hosts is invariably negative when considered in isolation, but may be complex and unexpected in nature. For example, if parasites make hosts less desirable to predators then gains from reduced predation may offset direct costs of being parasitized. We explore these ideas in the context of sea louse infestations on salmon. In Pacific Canada, sea lice can spread from farmed salmon to migrating juvenile wild salmon. Low numbers of sea lice can cause mortality of juvenile pink and chum salmon. For pink salmon, this has resulted in reduced productivity of river populations exposed to salmon farming. However, for chum salmon, we did not find an effect of sea louse infestations on productivity, despite high statistical power. Motivated by this unexpected result, we used a mathematical model to show how a parasite-induced shift in predation pressure from chum salmon to pink salmon could offset negative direct impacts of sea lice on chum salmon. This shift in predation is proposed to occur because predators show an innate preference for pink salmon prey. This preference may be more easily expressed when sea lice compromise juvenile salmon hosts, making them easier to catch. Our results indicate how the ecological context of host–parasite interactions may dampen, or even reverse, the expected impact of parasites on host populations. Text Pink salmon PubMed Central (PMC) Canada Pacific Proceedings of the Royal Society B: Biological Sciences 281 1776 20132913 |
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Research Articles Peacock, Stephanie J. Connors, Brendan M. Krkošek, Martin Irvine, James R. Lewis, Mark A. Can reduced predation offset negative effects of sea louse parasites on chum salmon? |
topic_facet |
Research Articles |
description |
The impact of parasites on hosts is invariably negative when considered in isolation, but may be complex and unexpected in nature. For example, if parasites make hosts less desirable to predators then gains from reduced predation may offset direct costs of being parasitized. We explore these ideas in the context of sea louse infestations on salmon. In Pacific Canada, sea lice can spread from farmed salmon to migrating juvenile wild salmon. Low numbers of sea lice can cause mortality of juvenile pink and chum salmon. For pink salmon, this has resulted in reduced productivity of river populations exposed to salmon farming. However, for chum salmon, we did not find an effect of sea louse infestations on productivity, despite high statistical power. Motivated by this unexpected result, we used a mathematical model to show how a parasite-induced shift in predation pressure from chum salmon to pink salmon could offset negative direct impacts of sea lice on chum salmon. This shift in predation is proposed to occur because predators show an innate preference for pink salmon prey. This preference may be more easily expressed when sea lice compromise juvenile salmon hosts, making them easier to catch. Our results indicate how the ecological context of host–parasite interactions may dampen, or even reverse, the expected impact of parasites on host populations. |
format |
Text |
author |
Peacock, Stephanie J. Connors, Brendan M. Krkošek, Martin Irvine, James R. Lewis, Mark A. |
author_facet |
Peacock, Stephanie J. Connors, Brendan M. Krkošek, Martin Irvine, James R. Lewis, Mark A. |
author_sort |
Peacock, Stephanie J. |
title |
Can reduced predation offset negative effects of sea louse parasites on chum salmon? |
title_short |
Can reduced predation offset negative effects of sea louse parasites on chum salmon? |
title_full |
Can reduced predation offset negative effects of sea louse parasites on chum salmon? |
title_fullStr |
Can reduced predation offset negative effects of sea louse parasites on chum salmon? |
title_full_unstemmed |
Can reduced predation offset negative effects of sea louse parasites on chum salmon? |
title_sort |
can reduced predation offset negative effects of sea louse parasites on chum salmon? |
publisher |
The Royal Society |
publishDate |
2014 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3871327 http://www.ncbi.nlm.nih.gov/pubmed/24352951 https://doi.org/10.1098/rspb.2013.2913 |
geographic |
Canada Pacific |
geographic_facet |
Canada Pacific |
genre |
Pink salmon |
genre_facet |
Pink salmon |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3871327 http://www.ncbi.nlm.nih.gov/pubmed/24352951 http://dx.doi.org/10.1098/rspb.2013.2913 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ © 2013 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, provided the original author and source are credited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1098/rspb.2013.2913 |
container_title |
Proceedings of the Royal Society B: Biological Sciences |
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281 |
container_issue |
1776 |
container_start_page |
20132913 |
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1766168455584677888 |