The effects of substrate composition on foraging behavior and growth rate of larval green sturgeon, Acipenser medirostris
Identifieur interne : 000D83 ( Main/Merge ); précédent : 000D82; suivant : 000D84The effects of substrate composition on foraging behavior and growth rate of larval green sturgeon, Acipenser medirostris
Auteurs : Rosalee M. Nguyen [États-Unis] ; Carlos E. Crocker [États-Unis]Source :
- Environmental biology of fishes [ 0378-1909 ] ; 2006.
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Abstract
We investigated the effects of substrate composition on foraging behavior and growth rate of larval green sturgeon, Acipenser medirostris, in the laboratory at 20±1°C over a period of 5 weeks. Larval groups (n = 100) with mean wet weight (0.72 ± 0.01 g) at 50 days post-hatch were reared on slaterocks, cobble, sand or glass. Typically, fish were negatively rheotactic and exhibited dispersed skimming behaviors on provided substrates during pre-feeding and feeding, respectively, but were all positively rheotactic during feeding. Fish reared on slate-rock substrates were negatively phototactic, remained benthic, and aggregated underneath the substrates. In all substrates except slate-rocks, fish displayed frequent episodes of burst and glide swimming activity, tank wall skimming and vertical swimming behaviors, however these behaviors ceased immediately during feeding and reappeared at the end of the feeding period. Substrate composition led to variable foraging effectiveness and likely contributed to significant differences in specific growth rates (2.28, 1.14, 1.77, and 2.27% body weight per day) and mortality (7%, 40%, 11%, 0%) among the treatment groups; slate-rocks, cobble, sand, and glass, respectively. There were no significant differences in morphometrics, somatotopic indices, and whole-body lipid content among treatment groups at the end of the experiment. The present findings indicate that certain substrates in artificial/natural habitats may negatively affect larval growth and may lead to decreased recruitment of juvenile green sturgeon in the wild.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">The effects of substrate composition on foraging behavior and growth rate of larval green sturgeon, Acipenser medirostris</title><author><name sortKey="Nguyen, Rosalee M" sort="Nguyen, Rosalee M" uniqKey="Nguyen R" first="Rosalee M." last="Nguyen">Rosalee M. Nguyen</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Department of Biology, San Francisco State University, 1600 Holloway Avenue</s1><s2>San Francisco, CA 94132</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Crocker, Carlos E" sort="Crocker, Carlos E" uniqKey="Crocker C" first="Carlos E." last="Crocker">Carlos E. Crocker</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Department of Biology, San Francisco State University, 1600 Holloway Avenue</s1><s2>San Francisco, CA 94132</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Californie</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">06-0464157</idno><date when="2006">2006</date><idno type="stanalyst">PASCAL 06-0464157 INIST</idno><idno type="RBID">Pascal:06-0464157</idno><idno type="wicri:Area/PascalFrancis/Corpus">000197</idno><idno type="wicri:Area/PascalFrancis/Curation">000179</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000193</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000193</idno><idno type="wicri:doubleKey">0378-1909:2006:Nguyen R:the:effects:of</idno><idno type="wicri:Area/Main/Merge">000D83</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">The effects of substrate composition on foraging behavior and growth rate of larval green sturgeon, Acipenser medirostris</title><author><name sortKey="Nguyen, Rosalee M" sort="Nguyen, Rosalee M" uniqKey="Nguyen R" first="Rosalee M." last="Nguyen">Rosalee M. Nguyen</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Department of Biology, San Francisco State University, 1600 Holloway Avenue</s1><s2>San Francisco, CA 94132</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Crocker, Carlos E" sort="Crocker, Carlos E" uniqKey="Crocker C" first="Carlos E." last="Crocker">Carlos E. Crocker</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Department of Biology, San Francisco State University, 1600 Holloway Avenue</s1><s2>San Francisco, CA 94132</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Californie</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="2006">2006</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>Anadromy</term><term>Composition</term><term>Foraging behavior</term><term>Growth rate</term><term>Larva</term><term>Pisces</term><term>Substrate</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Substrat</term><term>Composition</term><term>Fourragement</term><term>Taux croissance</term><term>Larve</term><term>Anadromie</term><term>Pisces</term><term>Acipenser sturio</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We investigated the effects of substrate composition on foraging behavior and growth rate of larval green sturgeon, Acipenser medirostris, in the laboratory at 20±1°C over a period of 5 weeks. Larval groups (n = 100) with mean wet weight (0.72 ± 0.01 g) at 50 days post-hatch were reared on slaterocks, cobble, sand or glass. Typically, fish were negatively rheotactic and exhibited dispersed skimming behaviors on provided substrates during pre-feeding and feeding, respectively, but were all positively rheotactic during feeding. Fish reared on slate-rock substrates were negatively phototactic, remained benthic, and aggregated underneath the substrates. In all substrates except slate-rocks, fish displayed frequent episodes of burst and glide swimming activity, tank wall skimming and vertical swimming behaviors, however these behaviors ceased immediately during feeding and reappeared at the end of the feeding period. Substrate composition led to variable foraging effectiveness and likely contributed to significant differences in specific growth rates (2.28, 1.14, 1.77, and 2.27% body weight per day) and mortality (7%, 40%, 11%, 0%) among the treatment groups; slate-rocks, cobble, sand, and glass, respectively. There were no significant differences in morphometrics, somatotopic indices, and whole-body lipid content among treatment groups at the end of the experiment. The present findings indicate that certain substrates in artificial/natural habitats may negatively affect larval growth and may lead to decreased recruitment of juvenile green sturgeon in the wild.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Californie</li></region></list><tree><country name="États-Unis"><region name="Californie"><name sortKey="Nguyen, Rosalee M" sort="Nguyen, Rosalee M" uniqKey="Nguyen R" first="Rosalee M." last="Nguyen">Rosalee M. Nguyen</name></region><name sortKey="Crocker, Carlos E" sort="Crocker, Carlos E" uniqKey="Crocker C" first="Carlos E." last="Crocker">Carlos E. Crocker</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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