Näytä suppeat kuvailutiedot

dc.contributor.authorValkonen, Janne
dc.contributor.authorNokelainen, Ossi
dc.contributor.authorMappes, Johanna
dc.date.accessioned2012-08-20T11:31:27Z
dc.date.available2012-08-20T11:31:27Z
dc.date.issued2011
dc.identifier.citationValkonen JK, Nokelainen O, Mappes J (2011) Antipredatory Function of Head Shape for Vipers and Their Mimics. PLoS ONE 6(7): e22272. doi:10.1371/journal.pone.0022272
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/38322
dc.description.abstractMost research into the adaptive significance of warning signals has focused on the colouration and patterns of prey animals. However, behaviour, odour and body shape can also have signal functions and thereby reduce predators' willingness to attack defended prey. European vipers all have a distinctive triangular head shape; and they are all venomous. Several non-venomous snakes, including the subfamily Natricinae, commonly flatten their heads (also known as head triangulation) when disturbed. The adaptive significance of this potential behavioural mimicry has never been investigated. We experimentally tested if the triangular head shape typical of vipers offers protection against predation. We compared the predation pressure of free-ranging predators on artificial snakes with triangular-shaped heads against the pressure on replicas with narrow heads. Snakes of both head types had either zigzag patterned bodies, typical of European vipers, or plain (patternless) bodies. Plain snakes with narrower Colubrid-like heads suffered significantly higher predation by raptors than snakes with triangular-shaped heads. Head shape did not, however, have an additive effect on survival in zigzag-patterned snakes, suggesting that species which differ from vipers in colouration and pattern would benefit most from behavioural mimicry. Our results demonstrate that the triangular head shape typical of vipers can act as a warning signal to predators. We suggest that head-shape mimicry may be a more common phenomenon among more diverse taxa than is currently recognised.fi
dc.language.isoeng
dc.publisherPublic Library of Science
dc.relation.ispartofseriesPLoS ONE
dc.subject.otheraposematismen
dc.subject.otherbehavioural mimicryen
dc.subject.otherNatrix mauraen
dc.subject.othersnakeen
dc.subject.otherViperaen
dc.titleAntipredatory Function of Head Shape for Vipers and Their Mimics
dc.typeArticle
dc.identifier.urnURN:NBN:fi:jyu-201208202192
dc.contributor.laitosBio- ja ympäristötieteiden laitosfi
dc.contributor.laitosThe Department of Biological and Environmental Scienceen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.identifier.doidoi:10.1371/journal.pone.0022272
dc.type.coarjournal article
dc.description.reviewstatuspeerReviewed
dc.relation.issn1932-6203
dc.type.versionpublishedVersion
dc.rights.copyright© 2011 Valkonen et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
dc.rights.accesslevelopenAccessfi
dc.rights.urlhttps://creativecommons.org/licenses/by/2.0/


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Näytä suppeat kuvailutiedot

© 2011 Valkonen et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Ellei muuten mainita, aineiston lisenssi on © 2011 Valkonen et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.