Toxin constraint explains diet choice, survival and population dynamics in a molluscivore shorebird
Recent insights suggest that predators should include (mildly) toxic prey when non-toxic food is scarce. However, the assumption that toxic prey is energetically as profitable as non-toxic prey misses the possibility that non-toxic prey have other ways to avoid being eaten, such as the formation of...
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ftpubmed:oai:pubmedcentral.nih.gov:3774237 2023-05-15T15:48:26+02:00 Toxin constraint explains diet choice, survival and population dynamics in a molluscivore shorebird van Gils, Jan A. van der Geest, Matthijs Leyrer, Jutta Oudman, Thomas Lok, Tamar Onrust, Jeroen de Fouw, Jimmy van der Heide, Tjisse van den Hout, Piet J. Spaans, Bernard Dekinga, Anne Brugge, Maarten Piersma, Theunis 2013-07-22 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3774237 http://www.ncbi.nlm.nih.gov/pubmed/23740782 https://doi.org/10.1098/rspb.2013.0861 en eng The Royal Society http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3774237 http://www.ncbi.nlm.nih.gov/pubmed/23740782 http://dx.doi.org/10.1098/rspb.2013.0861 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 2013 ftpubmed https://doi.org/10.1098/rspb.2013.0861 2013-10-06T00:53:15Z Recent insights suggest that predators should include (mildly) toxic prey when non-toxic food is scarce. However, the assumption that toxic prey is energetically as profitable as non-toxic prey misses the possibility that non-toxic prey have other ways to avoid being eaten, such as the formation of an indigestible armature. In that case, predators face a trade-off between avoiding toxins and minimizing indigestible ballast intake. Here, we report on the trophic interactions between a shorebird (red knot, Calidris canutus canutus) and its two main bivalve prey, one being mildly toxic but easily digestible, and the other being non-toxic but harder to digest. A novel toxin-based optimal diet model is developed and tested against an existing one that ignores toxin constraints on the basis of data on prey abundance, diet choice, local survival and numbers of red knots at Banc d'Arguin (Mauritania) over 8 years. Observed diet and annual survival rates closely fit the predictions of the toxin-based model, with survival and population size being highest in years when the non-toxic prey is abundant. In the 6 of 8 years when the non-toxic prey is not abundant enough to satisfy the energy requirements, red knots must rely on the toxic alternative. Text Calidris canutus Red Knot PubMed Central (PMC) Proceedings of the Royal Society B: Biological Sciences 280 1763 20130861 |
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PubMed Central (PMC) |
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English |
topic |
Research Articles |
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Research Articles van Gils, Jan A. van der Geest, Matthijs Leyrer, Jutta Oudman, Thomas Lok, Tamar Onrust, Jeroen de Fouw, Jimmy van der Heide, Tjisse van den Hout, Piet J. Spaans, Bernard Dekinga, Anne Brugge, Maarten Piersma, Theunis Toxin constraint explains diet choice, survival and population dynamics in a molluscivore shorebird |
topic_facet |
Research Articles |
description |
Recent insights suggest that predators should include (mildly) toxic prey when non-toxic food is scarce. However, the assumption that toxic prey is energetically as profitable as non-toxic prey misses the possibility that non-toxic prey have other ways to avoid being eaten, such as the formation of an indigestible armature. In that case, predators face a trade-off between avoiding toxins and minimizing indigestible ballast intake. Here, we report on the trophic interactions between a shorebird (red knot, Calidris canutus canutus) and its two main bivalve prey, one being mildly toxic but easily digestible, and the other being non-toxic but harder to digest. A novel toxin-based optimal diet model is developed and tested against an existing one that ignores toxin constraints on the basis of data on prey abundance, diet choice, local survival and numbers of red knots at Banc d'Arguin (Mauritania) over 8 years. Observed diet and annual survival rates closely fit the predictions of the toxin-based model, with survival and population size being highest in years when the non-toxic prey is abundant. In the 6 of 8 years when the non-toxic prey is not abundant enough to satisfy the energy requirements, red knots must rely on the toxic alternative. |
format |
Text |
author |
van Gils, Jan A. van der Geest, Matthijs Leyrer, Jutta Oudman, Thomas Lok, Tamar Onrust, Jeroen de Fouw, Jimmy van der Heide, Tjisse van den Hout, Piet J. Spaans, Bernard Dekinga, Anne Brugge, Maarten Piersma, Theunis |
author_facet |
van Gils, Jan A. van der Geest, Matthijs Leyrer, Jutta Oudman, Thomas Lok, Tamar Onrust, Jeroen de Fouw, Jimmy van der Heide, Tjisse van den Hout, Piet J. Spaans, Bernard Dekinga, Anne Brugge, Maarten Piersma, Theunis |
author_sort |
van Gils, Jan A. |
title |
Toxin constraint explains diet choice, survival and population dynamics in a molluscivore shorebird |
title_short |
Toxin constraint explains diet choice, survival and population dynamics in a molluscivore shorebird |
title_full |
Toxin constraint explains diet choice, survival and population dynamics in a molluscivore shorebird |
title_fullStr |
Toxin constraint explains diet choice, survival and population dynamics in a molluscivore shorebird |
title_full_unstemmed |
Toxin constraint explains diet choice, survival and population dynamics in a molluscivore shorebird |
title_sort |
toxin constraint explains diet choice, survival and population dynamics in a molluscivore shorebird |
publisher |
The Royal Society |
publishDate |
2013 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3774237 http://www.ncbi.nlm.nih.gov/pubmed/23740782 https://doi.org/10.1098/rspb.2013.0861 |
genre |
Calidris canutus Red Knot |
genre_facet |
Calidris canutus Red Knot |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3774237 http://www.ncbi.nlm.nih.gov/pubmed/23740782 http://dx.doi.org/10.1098/rspb.2013.0861 |
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.2013.0861 |
container_title |
Proceedings of the Royal Society B: Biological Sciences |
container_volume |
280 |
container_issue |
1763 |
container_start_page |
20130861 |
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1766383409019486208 |