What makes a late anchovy larva? The development of the caudal fin seen as a milestone in fish ontogeny
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Auteurs : Stylianos Somarakis [Grèce] ; Nikolaos Nikolioudakis [Grèce]Source :
- Journal of Plankton Research [ 0142-7873 ] ; 2010-03.
Abstract
In this study, we provide evidence, based on field-collected data and published articles, that the stage of caudal fin formation, initiated by notochord flexion (NF), might be a developmental milestone in the early life history of engraulids and other fishes, associated with changes in capabilities of the developing fish. An analysis of morphometric characters in anchovy (Engraulis encrasicolus) larvae collected from the Aegean Sea indicated a significant change in multivariate allometry at NF, with a marked increase in the growth of tail width and eye diameter. Initiation of swim-bladder inflation, which is considered to trigger the onset of vertical migrations and subsequent schooling behavior, was first observed at NF. This is further supported by a length-specific analysis of spatial patchiness (Bez's index of aggregation) based on data from three broad-scale ichthyoplankton surveys in the Aegean Sea; after the onset of NF (i.e. >7 mm preserved length), the aggregation of anchovy larvae started to increase rapidly implying that schooling might be well established in the early post-flexion stages. Published studies further support these field observations indicating that the NF in European anchovy is associated with the start of diel vertical migrations, the increase in otolith growth, a change in prey selectivity and an increased ability to evade plankton nets. The development of the caudal fin might be an important event in engraulids and other fishes but has generally been overlooked.
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DOI: 10.1093/plankt/fbp132
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The development of the caudal fin seen as a milestone in fish ontogeny</title><author><name sortKey="Somarakis, Stylianos" sort="Somarakis, Stylianos" uniqKey="Somarakis S" first="Stylianos" last="Somarakis">Stylianos Somarakis</name><affiliation wicri:level="1"><country xml:lang="fr">Grèce</country><wicri:regionArea>Hellenic Centre for Marine Research, Institute of Marine Biological Resources, PO Box 2214 71003, Heraklion, Crete</wicri:regionArea><wicri:noRegion>Crete</wicri:noRegion></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Grèce</country></affiliation></author><author><name sortKey="Nikolioudakis, Nikolaos" sort="Nikolioudakis, Nikolaos" uniqKey="Nikolioudakis N" first="Nikolaos" last="Nikolioudakis">Nikolaos Nikolioudakis</name><affiliation wicri:level="1"><country xml:lang="fr">Grèce</country><wicri:regionArea>Hellenic Centre for Marine Research, Institute of Marine Biological Resources, PO Box 2214 71003, Heraklion, Crete</wicri:regionArea><wicri:noRegion>Crete</wicri:noRegion></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Grèce</country><wicri:regionArea>Department of Biology, University of Crete, PO Box 2208 71409, Heraklion, Crete</wicri:regionArea><wicri:noRegion>Crete</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Plankton Research</title><idno type="ISSN">0142-7873</idno><idno type="eISSN">1464-3774</idno><imprint><publisher>Oxford University Press</publisher><date type="published" when="2010-03">2010-03</date><biblScope unit="volume">32</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="317">317</biblScope><biblScope unit="page" to="326">326</biblScope></imprint><idno type="ISSN">0142-7873</idno></series><idno type="istex">9D0E8CE870BC91ACE4C2F94414C7175E6F0F2C08</idno><idno type="DOI">10.1093/plankt/fbp132</idno><idno type="ArticleID">fbp132</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0142-7873</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">In this study, we provide evidence, based on field-collected data and published articles, that the stage of caudal fin formation, initiated by notochord flexion (NF), might be a developmental milestone in the early life history of engraulids and other fishes, associated with changes in capabilities of the developing fish. An analysis of morphometric characters in anchovy (Engraulis encrasicolus) larvae collected from the Aegean Sea indicated a significant change in multivariate allometry at NF, with a marked increase in the growth of tail width and eye diameter. Initiation of swim-bladder inflation, which is considered to trigger the onset of vertical migrations and subsequent schooling behavior, was first observed at NF. This is further supported by a length-specific analysis of spatial patchiness (Bez's index of aggregation) based on data from three broad-scale ichthyoplankton surveys in the Aegean Sea; after the onset of NF (i.e. >7 mm preserved length), the aggregation of anchovy larvae started to increase rapidly implying that schooling might be well established in the early post-flexion stages. Published studies further support these field observations indicating that the NF in European anchovy is associated with the start of diel vertical migrations, the increase in otolith growth, a change in prey selectivity and an increased ability to evade plankton nets. The development of the caudal fin might be an important event in engraulids and other fishes but has generally been overlooked.</div></front></TEI><affiliations><list><country><li>Grèce</li></country></list><tree><country name="Grèce"><noRegion><name sortKey="Somarakis, Stylianos" sort="Somarakis, Stylianos" uniqKey="Somarakis S" first="Stylianos" last="Somarakis">Stylianos Somarakis</name></noRegion><name sortKey="Nikolioudakis, Nikolaos" sort="Nikolioudakis, Nikolaos" uniqKey="Nikolioudakis N" first="Nikolaos" last="Nikolioudakis">Nikolaos Nikolioudakis</name><name sortKey="Nikolioudakis, Nikolaos" sort="Nikolioudakis, Nikolaos" uniqKey="Nikolioudakis N" first="Nikolaos" last="Nikolioudakis">Nikolaos Nikolioudakis</name><name sortKey="Somarakis, Stylianos" sort="Somarakis, Stylianos" uniqKey="Somarakis S" first="Stylianos" last="Somarakis">Stylianos Somarakis</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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