Behavior of early life intervals of Klamath River green sturgeon, Acipenser medirostris, with a note on body color
Identifieur interne : 000246 ( PascalFrancis/Checkpoint ); précédent : 000245; suivant : 000247Behavior of early life intervals of Klamath River green sturgeon, Acipenser medirostris, with a note on body color
Auteurs : Boyd Kynard [États-Unis] ; Erika Parker [États-Unis] ; Timothy Parker [États-Unis]Source :
- Environmental biology of fishes [ 0378-1909 ] ; 2005.
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Abstract
We studied ontogenetic behavior, migration, and wintering behavior of young Klamath River green sturgeon, Acipenser medirostris, in the laboratory to provide insight into likely behavior of wild sturgeon. Hatchling free embryos preferred cover but were poor swimmers and could not move farther than a few centimeters to cover. The poor swimming ability and cover preference of hatchlings suggests evolution for habitat selection of females to place eggs in habitat with cover for eggs (and hatchlings), and for egg characteristics (large, dense, and weakly adhesive) to cause rapid sinking into cover without drifting. A day or so after fish developed into larvae (first life interval feeding exogenously), day-12 larvae initiated a 12-day downstream nocturnal migration. A totally nocturnal migration is unlike other Acipenser migrants yet studied. Migrant larvae had a dark-colored body typical of other Acipenser species that migrate as larvae. Tail color was a dark black (black-tail phenotype) only during the early larva period, suggesting a morphological adaptation for migration, foraging, or both. Post-migrant larvae and early juveniles to day 84 foraged diurnally with a nocturnal activity peak. Day 110-181 juveniles moved downstream at night until water temperature decreased to about 8°C, indicating wild juveniles migrate downstream to wintering habitat. Habitat preference of month 9-10 wintering juveniles suggests wild juveniles are in deep pools with low light and some rock structure. Wintering juveniles were only active at night. Initiation and cessation of daily activity was at dusk and dawn during illumination changes of < 1.01x. This sensitivity to illumination has not been found before in sturgeons. During the first 10 months of life, nocturnal activity of early life intervals is a dominant feature of migration, foraging, and wintering.
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Conte Anadromous Fish Research Center, Leetown Science Center (U.S. Geological Survey, Biological Resources Division), One Migratory Way</s1><s2>Turners Falls, MA 01376</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Massachusetts</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">05-0139766</idno><date when="2005">2005</date><idno type="stanalyst">PASCAL 05-0139766 INIST</idno><idno type="RBID">Pascal:05-0139766</idno><idno type="wicri:Area/PascalFrancis/Corpus">000251</idno><idno type="wicri:Area/PascalFrancis/Curation">000125</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000246</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000246</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Behavior of early life intervals of Klamath River green sturgeon, Acipenser medirostris, 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="2"><inist:fA14 i1="01"><s1>S.O. 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Conte Anadromous Fish Research Center, Leetown Science Center (U.S. Geological Survey, Biological Resources Division), One Migratory Way</s1><s2>Turners Falls, MA 01376</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Massachusetts</region></placeName></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 sturio</term><term>Behavior</term><term>Behavioral ontogeny</term><term>Color</term><term>Dispersion</term><term>Habitat</term><term>Interval</term><term>Larva</term><term>Overwintering</term><term>Pisces</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Comportement</term><term>Intervalle</term><term>Couleur</term><term>Ontogenèse comportement</term><term>Dispersion</term><term>Habitat</term><term>Larve</term><term>Hivernage</term><term>Pisces</term><term>Acipenser sturio</term><term>Rivière Green</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Habitat</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We studied ontogenetic behavior, migration, and wintering behavior of young Klamath River green sturgeon, Acipenser medirostris, in the laboratory to provide insight into likely behavior of wild sturgeon. Hatchling free embryos preferred cover but were poor swimmers and could not move farther than a few centimeters to cover. The poor swimming ability and cover preference of hatchlings suggests evolution for habitat selection of females to place eggs in habitat with cover for eggs (and hatchlings), and for egg characteristics (large, dense, and weakly adhesive) to cause rapid sinking into cover without drifting. A day or so after fish developed into larvae (first life interval feeding exogenously), day-12 larvae initiated a 12-day downstream nocturnal migration. A totally nocturnal migration is unlike other Acipenser migrants yet studied. Migrant larvae had a dark-colored body typical of other Acipenser species that migrate as larvae. Tail color was a dark black (black-tail phenotype) only during the early larva period, suggesting a morphological adaptation for migration, foraging, or both. Post-migrant larvae and early juveniles to day 84 foraged diurnally with a nocturnal activity peak. Day 110-181 juveniles moved downstream at night until water temperature decreased to about 8°C, indicating wild juveniles migrate downstream to wintering habitat. Habitat preference of month 9-10 wintering juveniles suggests wild juveniles are in deep pools with low light and some rock structure. Wintering juveniles were only active at night. Initiation and cessation of daily activity was at dusk and dawn during illumination changes of < 1.01x. This sensitivity to illumination has not been found before in sturgeons. During the first 10 months of life, nocturnal activity of early life intervals is a dominant feature of migration, foraging, and wintering.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0378-1909</s0></fA01><fA02 i1="01"><s0>EBFID3</s0></fA02><fA03 i2="1"><s0>Environ. biol. fishes</s0></fA03><fA05><s2>72</s2></fA05><fA06><s2>1</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Behavior of early life intervals of Klamath River green sturgeon, Acipenser medirostris, with a note on body color</s1></fA08><fA11 i1="01" i2="1"><s1>KYNARD (Boyd)</s1></fA11><fA11 i1="02" i2="1"><s1>PARKER (Erika)</s1></fA11><fA11 i1="03" i2="1"><s1>PARKER (Timothy)</s1></fA11><fA14 i1="01"><s1>S.O. 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Post-migrant larvae and early juveniles to day 84 foraged diurnally with a nocturnal activity peak. Day 110-181 juveniles moved downstream at night until water temperature decreased to about 8°C, indicating wild juveniles migrate downstream to wintering habitat. Habitat preference of month 9-10 wintering juveniles suggests wild juveniles are in deep pools with low light and some rock structure. Wintering juveniles were only active at night. Initiation and cessation of daily activity was at dusk and dawn during illumination changes of < 1.01x. This sensitivity to illumination has not been found before in sturgeons. 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