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Ontogeny of swimming behaviour in sardine Sardina pilchardus larvae and effect of larval nutritional condition on critical speed

2014Journal article Restricted access
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dc.contributor.authorSilva, L.
dc.contributor.authorFaria, Ana Margarida da Silva
dc.contributor.authorChicharo, Maria Alexandra Teodosio
dc.contributor.authorGarrido, Susana
dc.date.accessioned2015-01-19T11:18:42Z
dc.date.available2015-01-19T11:18:42Z
dc.date.issued2014
dc.date.updated2015-01-17T01:21:23Z
dc.description.abstractThe ontogeny of swimming behaviour in sardine Sardina pilchardus larvae was studied, from hatching to 75 days post-hatch (dph), by measuring the critical swimming speed (Ucrit) and observing locomotory behaviour. In addition, the effect of larval nutritional condition on Ucrit at the onset of their swimming abilities (20 to 25 dph) was evaluated by rearing larvae under 4 different feeding treatments. Diets consisted of different concentrations of dinoflagellates, rotifers and the copepod Acartia grani, and a wild plankton assemblage. Recently hatched larvae were mostly inactive, but from 2 dph onwards larvae started to swim freely in the rearing tank, and time spent swimming increased throughout ontogeny. Larvae younger than 20 dph (i.e. <7.90 mm TL) could not swim for the entire adjustment period at the minimum current speed, but thereafter Ucrit increased significantly with larval age and length, reaching a maximum of 9.47 cm s-1 at 19.10 mm TL and 55 dph. Growth, survival and the nutritional condition of sardine larvae, assessed by the RNA residual index, were significantly higher for larvae reared with the high-concentration diet, contrary to the other derived nucleic acids indices (RNA/DNA and DNA/DW), which showed no differences between diets. Despite differences in the survival and growth rates of sardine larvae, Ucrit at the onset of swimming did not differ significantly among diets, but was significantly related to larval nutritional condition as assessed by the RNA residual index. Overall, our results show that early larval stages of sardines have poor swimming ability and probably rely on food patches in the wild to survive; however, close to metamorphosis (especially from 45 dph onwards), larvae spend most of the time swimming and are capable of resisting the mean current speeds of their natural environment, which may strongly enhance chances for survival.por
dc.identifier.citationSilva, L; Faria, AM; Teodósio, MA; Garrido, S.Ontogeny of swimming behaviour in sardine Sardina pilchardus larvae and effect of larval nutritional condition on critical speed, Marine Ecology Progress Series, 504, na, 287-300, 2014.por
dc.identifier.issn0171-8630
dc.identifier.otherAUT: MCH00377;
dc.identifier.urihttp://hdl.handle.net/10400.1/5710
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherInter Researchpor
dc.relation.publisherversionhttp://www.int-res.com/abstracts/meps/v504/p287-300/por
dc.subjectOntogenypor
dc.subjectCritical swimming speedpor
dc.subjectSardina pilcharduspor
dc.subjectNucleic acid derived indicespor
dc.subjectRNA/DNApor
dc.subjectForagingpor
dc.titleOntogeny of swimming behaviour in sardine Sardina pilchardus larvae and effect of larval nutritional condition on critical speedpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage300por
oaire.citation.startPage287por
oaire.citation.titleMarine Ecology Progress Seriespor
oaire.citation.volume504por
person.familyNameTeodosio
person.givenNameMaria
person.identifier.ciencia-idAF10-647B-65FB
person.identifier.orcid0000-0002-0939-9885
person.identifier.ridB-5077-2013
person.identifier.scopus-author-id56196396700
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublicationb39b2d6d-d6f5-4130-a9b9-4e7624d44676
relation.isAuthorOfPublication.latestForDiscoveryb39b2d6d-d6f5-4130-a9b9-4e7624d44676

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