Distribution and onshore migration behaviour of burbot larvae in Lake Constance, Germany
Identifieur interne : 000A59 ( Main/Merge ); précédent : 000A58; suivant : 000A60Distribution and onshore migration behaviour of burbot larvae in Lake Constance, Germany
Auteurs : O. Miler [Allemagne] ; P. Fischer [Allemagne]Source :
- Journal of fish biology [ 0022-1112 ] ; 2004.
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Abstract
Larval abundance of burbot Lota lota in the pelagic zone of Lake Constance, Germany, peaked during April and remained at a constant but lower level until mid-June. From the end of May onwards a significant diet vertical migration pattern was observed: while burbot larvae were distributed above as well as below the thermocline in the daytime with the highest percentages of abundance at water depths of 30 and 50m (below the thermocline) on 5 and 25 June, they were concentrated from 2 to 15 m (above the thermocline) during the night. This migration pattern coincided with a significant decline in the food items preferred by burbot at this life stage, cyclopoid copepods. This phase of diet vertical migration lasted for c. 4 weeks until the burbot larvae suddenly disappeared from the pelagic zone. This indicated a short phase, lasting only a few days, of larval settlement into profundal benthic habitats. This was supported by a significant, abrupt decrease in the absolute growth rates of the larvae at day 56 after hatching. The day-night pattern of vertical migration observed could be assumed to be a transition phase from a pelagic to a benthic lifestyle, as reported for juveniles of several other, marine gadoid species.
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Pascal:04-0259138Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Distribution and onshore migration behaviour of burbot larvae in Lake Constance, Germany</title><author><name sortKey="Miler, O" sort="Miler, O" uniqKey="Miler O" first="O." last="Miler">O. Miler</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Limnological Institute, University of Konstanz</s1><s2>78457 Konstanz</s2><s3>DEU</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Allemagne</country><placeName><region type="land" nuts="1">Bade-Wurtemberg</region><region type="district" nuts="2">District de Fribourg-en-Brisgau</region><settlement type="city">Constance (Allemagne)</settlement></placeName><orgName type="university">Université de Constance</orgName></affiliation></author><author><name sortKey="Fischer, P" sort="Fischer, P" uniqKey="Fischer P" first="P." last="Fischer">P. Fischer</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Limnological Institute, University of Konstanz</s1><s2>78457 Konstanz</s2><s3>DEU</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Allemagne</country><placeName><region type="land" nuts="1">Bade-Wurtemberg</region><region type="district" nuts="2">District de Fribourg-en-Brisgau</region><settlement type="city">Constance (Allemagne)</settlement></placeName><orgName type="university">Université de Constance</orgName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">04-0259138</idno><date when="2004">2004</date><idno type="stanalyst">PASCAL 04-0259138 INIST</idno><idno type="RBID">Pascal:04-0259138</idno><idno type="wicri:Area/PascalFrancis/Corpus">000077</idno><idno type="wicri:Area/PascalFrancis/Curation">000041</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000075</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000075</idno><idno type="wicri:doubleKey">0022-1112:2004:Miler O:distribution:and:onshore</idno><idno type="wicri:Area/Main/Merge">000A59</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Distribution and onshore migration behaviour of burbot larvae in Lake Constance, Germany</title><author><name sortKey="Miler, O" sort="Miler, O" uniqKey="Miler O" first="O." last="Miler">O. Miler</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Limnological Institute, University of Konstanz</s1><s2>78457 Konstanz</s2><s3>DEU</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Allemagne</country><placeName><region type="land" nuts="1">Bade-Wurtemberg</region><region type="district" nuts="2">District de Fribourg-en-Brisgau</region><settlement type="city">Constance (Allemagne)</settlement></placeName><orgName type="university">Université de Constance</orgName></affiliation></author><author><name sortKey="Fischer, P" sort="Fischer, P" uniqKey="Fischer P" first="P." last="Fischer">P. Fischer</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Limnological Institute, University of Konstanz</s1><s2>78457 Konstanz</s2><s3>DEU</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Allemagne</country><placeName><region type="land" nuts="1">Bade-Wurtemberg</region><region type="district" nuts="2">District de Fribourg-en-Brisgau</region><settlement type="city">Constance (Allemagne)</settlement></placeName><orgName type="university">Université de Constance</orgName></affiliation></author></analytic><series><title level="j" type="main">Journal of fish biology</title><title level="j" type="abbreviated">J. fish biol.</title><idno type="ISSN">0022-1112</idno><imprint><date when="2004">2004</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of fish biology</title><title level="j" type="abbreviated">J. fish biol.</title><idno type="ISSN">0022-1112</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Animal migration</term><term>Biology</term><term>Germany</term><term>Lake Constance</term><term>Larva</term><term>Pisces</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Migration animale</term><term>Larve</term><term>Lac Constance</term><term>Allemagne</term><term>Pisces</term><term>Biologie</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Allemagne</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Biologie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Larval abundance of burbot Lota lota in the pelagic zone of Lake Constance, Germany, peaked during April and remained at a constant but lower level until mid-June. From the end of May onwards a significant diet vertical migration pattern was observed: while burbot larvae were distributed above as well as below the thermocline in the daytime with the highest percentages of abundance at water depths of 30 and 50m (below the thermocline) on 5 and 25 June, they were concentrated from 2 to 15 m (above the thermocline) during the night. This migration pattern coincided with a significant decline in the food items preferred by burbot at this life stage, cyclopoid copepods. This phase of diet vertical migration lasted for c. 4 weeks until the burbot larvae suddenly disappeared from the pelagic zone. This indicated a short phase, lasting only a few days, of larval settlement into profundal benthic habitats. This was supported by a significant, abrupt decrease in the absolute growth rates of the larvae at day 56 after hatching. The day-night pattern of vertical migration observed could be assumed to be a transition phase from a pelagic to a benthic lifestyle, as reported for juveniles of several other, marine gadoid species.</div></front></TEI><affiliations><list><country><li>Allemagne</li></country><region><li>Bade-Wurtemberg</li><li>District de Fribourg-en-Brisgau</li></region><settlement><li>Constance (Allemagne)</li></settlement><orgName><li>Université de Constance</li></orgName></list><tree><country name="Allemagne"><region name="Bade-Wurtemberg"><name sortKey="Miler, O" sort="Miler, O" uniqKey="Miler O" first="O." last="Miler">O. Miler</name></region><name sortKey="Fischer, P" sort="Fischer, P" uniqKey="Fischer P" first="P." last="Fischer">P. Fischer</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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