Ontogenetic behavior and dispersal of Sacramento River white sturgeon, Acipenser transmontanus, with a note on body color
Identifieur interne : 001022 ( Main/Merge ); précédent : 001021; suivant : 001023Ontogenetic behavior and dispersal of Sacramento River white sturgeon, Acipenser transmontanus, with a note on body color
Auteurs : Boyd Kynard [États-Unis] ; Erika Parker [États-Unis]Source :
- Environmental biology of fishes [ 0378-1909 ] ; 2005.
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Abstract
We studied Sacramento River white sturgeon, Acipenser transmontanus, in the laboratory to develop a conceptual model of ontogenetic behavior and provide insight into probable behavior of wild sturgeon. After hatching, free embryos initiated a low intensity, brief downstream dispersal during which fish swam near the bottom and were photonegative. The weak, short dispersal style and behavior of white sturgeon free embryos contrasts greatly with the intense, long dispersal style and behavior (photopositive and swimming far above the bottom) of dispersing free embryos of other sturgeon species. If spawned eggs are concentrated within a few kilometers downstream of a spawning site, the adaptive significance of the free embryo dispersal is likely to move fish away from the egg deposition site to avoid predation and reduce fish density prior to feeding. Larvae foraged on the open bottom, swam <1 m above the bottom, aggregated, but did not disperse. Early juveniles initiated a strong dispersal with fish strongly vigorously swimming downstream. Duration of the juvenile dispersal is unknown, but the strong swimming likely disperses fish many kilometers. Recruitment failure in white sturgeon populations may be a mis-match between the innate fish dispersal and post-dispersal rearing habitat, which is now highly altered by damming and reservoirs. Sacramento River white sturgeon has a two-step downstream dispersal by the free embryo and juvenile life intervals. Diel activity of all life intervals peaked at night, whether fish were dispersing or foraging. Nocturnal behavior is likely a response to predation, which occurs during both activities. An intense black-tail body color was present on foraging larvae, but was weak or absent on the two life intervals that disperse. Black-tail color may be an adaptation for avoiding predation, signaling among aggregated larvae, or both, but not for dispersal.
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Conte Anadromous Fish Research Center, Leetown Science Center (U.S. Geological Survey), One Migratory Way</s1><s2>Turners Falls, MA, 01376</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Turners Falls, MA, 01376</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">05-0486339</idno><date when="2005">2005</date><idno type="stanalyst">PASCAL 05-0486339 INIST</idno><idno type="RBID">Pascal:05-0486339</idno><idno type="wicri:Area/PascalFrancis/Corpus">000231</idno><idno type="wicri:Area/PascalFrancis/Curation">000145</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000229</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000229</idno><idno type="wicri:doubleKey">0378-1909:2005:Kynard B:ontogenetic:behavior:and</idno><idno type="wicri:Area/Main/Merge">001022</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Ontogenetic behavior and dispersal of Sacramento River white sturgeon, Acipenser transmontanus, with a note on body color</title><author><name sortKey="Kynard, Boyd" sort="Kynard, Boyd" uniqKey="Kynard B" first="Boyd" last="Kynard">Boyd Kynard</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>S.O. Conte Anadromous Fish Research Center, Leetown Science Center (U.S. Geological Survey), One Migratory Way</s1><s2>Turners Falls, MA, 01376</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Turners Falls, MA, 01376</wicri:noRegion></affiliation></author><author><name sortKey="Parker, Erika" sort="Parker, Erika" uniqKey="Parker E" first="Erika" last="Parker">Erika Parker</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>S.O. Conte Anadromous Fish Research Center, Leetown Science Center (U.S. Geological Survey), One Migratory Way</s1><s2>Turners Falls, MA, 01376</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Turners Falls, MA, 01376</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Environmental biology of fishes</title><title level="j" type="abbreviated">Environ. biol. fishes</title><idno type="ISSN">0378-1909</idno><imprint><date when="2005">2005</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Environmental biology of fishes</title><title level="j" type="abbreviated">Environ. biol. fishes</title><idno type="ISSN">0378-1909</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acipenser transmontanus</term><term>Alteration</term><term>Behavior</term><term>Behavioral ontogeny</term><term>Color</term><term>Dispersion</term><term>Habitat</term><term>Larva</term><term>Migration</term><term>Pisces</term><term>Sacramento River</term><term>White River</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Ontogenèse comportement</term><term>Dispersion</term><term>Couleur</term><term>Pisces</term><term>Comportement</term><term>Habitat</term><term>Larve</term><term>Migration</term><term>Altération</term><term>Acipenser transmontanus</term><term>Rivière Sacramento</term><term>Rivière White</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Habitat</term><term>Migration</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We studied Sacramento River white sturgeon, Acipenser transmontanus, in the laboratory to develop a conceptual model of ontogenetic behavior and provide insight into probable behavior of wild sturgeon. After hatching, free embryos initiated a low intensity, brief downstream dispersal during which fish swam near the bottom and were photonegative. The weak, short dispersal style and behavior of white sturgeon free embryos contrasts greatly with the intense, long dispersal style and behavior (photopositive and swimming far above the bottom) of dispersing free embryos of other sturgeon species. If spawned eggs are concentrated within a few kilometers downstream of a spawning site, the adaptive significance of the free embryo dispersal is likely to move fish away from the egg deposition site to avoid predation and reduce fish density prior to feeding. Larvae foraged on the open bottom, swam <1 m above the bottom, aggregated, but did not disperse. Early juveniles initiated a strong dispersal with fish strongly vigorously swimming downstream. Duration of the juvenile dispersal is unknown, but the strong swimming likely disperses fish many kilometers. Recruitment failure in white sturgeon populations may be a mis-match between the innate fish dispersal and post-dispersal rearing habitat, which is now highly altered by damming and reservoirs. Sacramento River white sturgeon has a two-step downstream dispersal by the free embryo and juvenile life intervals. Diel activity of all life intervals peaked at night, whether fish were dispersing or foraging. Nocturnal behavior is likely a response to predation, which occurs during both activities. An intense black-tail body color was present on foraging larvae, but was weak or absent on the two life intervals that disperse. Black-tail color may be an adaptation for avoiding predation, signaling among aggregated larvae, or both, but not for dispersal.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country></list><tree><country name="États-Unis"><noRegion><name sortKey="Kynard, Boyd" sort="Kynard, Boyd" uniqKey="Kynard B" first="Boyd" last="Kynard">Boyd Kynard</name></noRegion><name sortKey="Parker, Erika" sort="Parker, Erika" uniqKey="Parker E" first="Erika" last="Parker">Erika Parker</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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