Spawning migration of American eel Anguilla rostrata from pristine (1843–1872) to contemporary (1963–1990) periods in the St Lawrence Estuary, Canada
Identifieur interne : 000F52 ( Istex/Corpus ); précédent : 000F51; suivant : 000F53Spawning migration of American eel Anguilla rostrata from pristine (1843–1872) to contemporary (1963–1990) periods in the St Lawrence Estuary, Canada
Auteurs : G. Verreault ; M. Mingelbier ; P. DumontSource :
- Journal of Fish Biology [ 0022-1112 ] ; 2012-07.
English descriptors
- KwdEn :
Abstract
Daily American eel Anguilla rostrata catches and their dates of passage (starting, median and ending dates) were compared between pristine (1843–1872) and contemporary periods (1963–1990) to determine any changes and see whether these were related to environmental variations and water discharge regulation. Timing and duration of A. rostrata migration patterns differed significantly between the two periods. In the contemporary period, migrating A. rostrata were intercepted significantly earlier than in pristine times (18 days earlier on average), and ended at the same average period. Early A. rostrata migration was also significantly related to high spring flow and secondarily to high spring temperature, while migration ended later when high temperature or low water level occurred during the autumn period. A recent slight increase in the water temperature of the St Lawrence River could partially explain the earlier A. rostrata migration observed during the contemporary period. In return, the effect of high spring flow should have been more contrasted if the river discharge would have not been regulated. Recent A. rostrata production now being mainly restricted to the lower part of St Lawrence River mainstream, resulting shorter travelling distance to the estuary may explain why migrating progress was earlier during the contemporary period.
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DOI: 10.1111/j.1095-8649.2012.03366.x
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<front><div type="abstract" xml:lang="en">Daily American eel Anguilla rostrata catches and their dates of passage (starting, median and ending dates) were compared between pristine (1843–1872) and contemporary periods (1963–1990) to determine any changes and see whether these were related to environmental variations and water discharge regulation. Timing and duration of A. rostrata migration patterns differed significantly between the two periods. In the contemporary period, migrating A. rostrata were intercepted significantly earlier than in pristine times (18 days earlier on average), and ended at the same average period. Early A. rostrata migration was also significantly related to high spring flow and secondarily to high spring temperature, while migration ended later when high temperature or low water level occurred during the autumn period. A recent slight increase in the water temperature of the St Lawrence River could partially explain the earlier A. rostrata migration observed during the contemporary period. In return, the effect of high spring flow should have been more contrasted if the river discharge would have not been regulated. Recent A. rostrata production now being mainly restricted to the lower part of St Lawrence River mainstream, resulting shorter travelling distance to the estuary may explain why migrating progress was earlier during the contemporary period.</div>
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<abstractGroup><abstract type="main" xml:lang="en"><p>Daily American eel <i>Anguilla rostrata</i>
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were intercepted significantly earlier than in pristine times (18 days earlier on average), and ended at the same average period. Early <i>A. rostrata</i>
migration was also significantly related to high spring flow and secondarily to high spring temperature, while migration ended later when high temperature or low water level occurred during the autumn period. A recent slight increase in the water temperature of the St Lawrence River could partially explain the earlier <i>A. rostrata</i>
migration observed during the contemporary period. In return, the effect of high spring flow should have been more contrasted if the river discharge would have not been regulated. Recent <i>A. rostrata</i>
production now being mainly restricted to the lower part of St Lawrence River mainstream, resulting shorter travelling distance to the estuary may explain why migrating progress was earlier during the contemporary period.</p>
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<role><roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal"><namePart type="given">P.</namePart>
<namePart type="family">Dumont</namePart>
<affiliation>Ministère des Ressources Naturelles et de la Faune du Québec, 201 Place Charles‐LeMoyne, Longueuil, Québec, J4K 2T5 Canada</affiliation>
<role><roleTerm type="text">author</roleTerm>
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<typeOfResource>text</typeOfResource>
<genre type="article" displayLabel="article"></genre>
<originInfo><publisher>Blackwell Publishing Ltd</publisher>
<place><placeTerm type="text">Oxford, UK</placeTerm>
</place>
<dateIssued encoding="w3cdtf">2012-07</dateIssued>
<copyrightDate encoding="w3cdtf">2012</copyrightDate>
</originInfo>
<language><languageTerm type="code" authority="rfc3066">en</languageTerm>
<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
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<extent unit="figures">7</extent>
<extent unit="tables">1</extent>
<extent unit="references">7</extent>
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<abstract lang="en">Daily American eel Anguilla rostrata catches and their dates of passage (starting, median and ending dates) were compared between pristine (1843–1872) and contemporary periods (1963–1990) to determine any changes and see whether these were related to environmental variations and water discharge regulation. Timing and duration of A. rostrata migration patterns differed significantly between the two periods. In the contemporary period, migrating A. rostrata were intercepted significantly earlier than in pristine times (18 days earlier on average), and ended at the same average period. Early A. rostrata migration was also significantly related to high spring flow and secondarily to high spring temperature, while migration ended later when high temperature or low water level occurred during the autumn period. A recent slight increase in the water temperature of the St Lawrence River could partially explain the earlier A. rostrata migration observed during the contemporary period. In return, the effect of high spring flow should have been more contrasted if the river discharge would have not been regulated. Recent A. rostrata production now being mainly restricted to the lower part of St Lawrence River mainstream, resulting shorter travelling distance to the estuary may explain why migrating progress was earlier during the contemporary period.</abstract>
<subject lang="en"><genre>keywords</genre>
<topic>downstream migration</topic>
<topic>duration</topic>
<topic>silver eel</topic>
<topic>timing</topic>
</subject>
<relatedItem type="host"><titleInfo><title>Journal of Fish Biology</title>
</titleInfo>
<genre type="journal">journal</genre>
<identifier type="ISSN">0022-1112</identifier>
<identifier type="eISSN">1095-8649</identifier>
<identifier type="DOI">10.1111/(ISSN)1095-8649</identifier>
<identifier type="PublisherID">JFB</identifier>
<part><date>2012</date>
<detail type="title"><title>Fish Migration in the 21st Century: Opportunities and Challenges</title>
</detail>
<detail type="volume"><caption>vol.</caption>
<number>81</number>
</detail>
<detail type="issue"><caption>no.</caption>
<number>2</number>
</detail>
<extent unit="pages"><start>387</start>
<end>407</end>
<total>7</total>
</extent>
</part>
</relatedItem>
<identifier type="istex">9851564AA7D9CE2F9158B79828E4CF7D81185683</identifier>
<identifier type="DOI">10.1111/j.1095-8649.2012.03366.x</identifier>
<identifier type="ArticleID">JFB3366</identifier>
<accessCondition type="use and reproduction" contentType="copyright">© 2012 The Authors. Journal of Fish Biology © 2012 The Fisheries Society of the British Isles</accessCondition>
<recordInfo><recordContentSource>WILEY</recordContentSource>
<recordOrigin>Blackwell Publishing Ltd</recordOrigin>
</recordInfo>
</mods>
</metadata>
<serie></serie>
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