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Digging with 'hands': observations of food capture in the flying gurnard Dactylopterus volitans (Linnaeus, 1758)

2019-11Journal article Restricted access
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dc.contributor.authorDavenport, John
dc.contributor.authorWirtz, Peter
dc.date.accessioned2020-07-24T10:50:56Z
dc.date.available2020-07-24T10:50:56Z
dc.date.issued2019-11
dc.description.abstractVideofilms of a foraging flying gurnard (Dactylopterus volitans) were collected at Itaipu, Niteroi, RJ, Brazil. Analysis revealed details of the use of anterior parts of the pectoral fins which act as digging 'hands' to access infaunal prey items that are subsequently captured by oral suction feeding. Each pectoral fin has two distinct sections articulated separately on the pectoral girdle. The digging 'anterior pectoral fin' mainly consists of segmented and flexible fin rays but has an anterior robust unsegmented ray that provides an edge to the 'hand', allowing penetration of the substratum. The huge 'posterior pectoral fins' are supported by unsegmented rays. Most digging episodes involved one 'hand' and consisted of 1-7 cycles of movement with frequencies 1.15-3.74 cycles s(-1). During a cycle, the 'hand' is moved forwards and medially above the substratum, then is twisted medially and simultaneously depressed so that the anterior unsegmented ray impacts and enters the substratum. The hand is then drawn backwards and laterally to disturb the substratum. To prevent upward pitching of the head during digging, the 'posterior pectoral fins' are both moved anteriorly and laterally to shift the centre of gravity forwards while the caudal and second dorsal fins continue to provide propulsive force.
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1080/00222933.2019.1705415
dc.identifier.issn0022-2933
dc.identifier.urihttp://hdl.handle.net/10400.1/14175
dc.language.isoeng
dc.peerreviewedyes
dc.publisherTaylor & Francis
dc.subject6-legged walking
dc.subjectFish
dc.subjectSearobin
dc.subjectDigging for prey
dc.subjectPectoral fin 'hands'
dc.subjectSyngnathiformes
dc.subjectDactylopteridae
dc.subjectFlying gurnards
dc.titleDigging with 'hands': observations of food capture in the flying gurnard Dactylopterus volitans (Linnaeus, 1758)
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMulti%2F04326%2F2013/PT
oaire.citation.endPage2501
oaire.citation.issue41-42
oaire.citation.startPage2489
oaire.citation.titleJournal of Natural History
oaire.citation.volume53
oaire.fundingStream5876
person.familyNameWirtz
person.givenNamePeter
person.identifier.orcid0000-0003-3920-6228
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublicationf17e3dea-12ea-4de1-bc7f-85a214044d92
relation.isAuthorOfPublication.latestForDiscoveryf17e3dea-12ea-4de1-bc7f-85a214044d92
relation.isProjectOfPublication868b4818-3efa-4edb-9202-c464d64fd38f
relation.isProjectOfPublication.latestForDiscovery868b4818-3efa-4edb-9202-c464d64fd38f

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