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Seasonal variation in the diet of juvenile lake sturgeon, Acipenser fulvescens, Rafinesque, 1817, in the Winnipeg River, Manitoba, Canada

Identifieur interne : 001786 ( Istex/Corpus ); précédent : 001785; suivant : 001787

Seasonal variation in the diet of juvenile lake sturgeon, Acipenser fulvescens, Rafinesque, 1817, in the Winnipeg River, Manitoba, Canada

Auteurs : C. C. Barth ; W. G. Anderson ; S. J. Peake ; P. Nelson

Source :

RBID : ISTEX:1924E211385A50B512AA3943B46203950B459FB1

Abstract

The lake sturgeon, Acipenser fulvescens, is a threatened species across most of its range. To understand any potential shifts in diet across season or habitat, stomach contents were examined from juvenile lake sturgeon caught in the Winnipeg River, Manitoba, Canada. This information will aid in assessment of environmental impacts and conservation initiatives for this threatened species. From 2006 to 2008 gut contents were collected from juvenile lake sturgeon using a non‐lethal gastric lavage methodology. Juvenile lake sturgeon were sampled from four discrete deep water habitat types (13.7–27.4 m depths), during the months of May, June, July and October. In total, 13 066 prey items belonging to 14 prey groups were collected from 345 juvenile lake sturgeon (251–835 mm TL). Overall, juvenile lake sturgeon consumed a low diversity of organisms; insect larvae from three invertebrate orders, Trichoptera, Diptera and Ephemeroptera, accounted for 97.4% of the total numeric abundance of prey items recovered. A relationship between size of juvenile lake sturgeon and prey quantity or type was not observed. Diet of juvenile lake sturgeon varied in relation to season, with Diptera (77.6%) being the most abundant prey in May, Trichoptera the most abundant in June (n = 3,056, 60.4%) and July (n = 2,055, 52.6%). During October, 96% of stomachs examined were empty. In terms of habitat type, the standardized abundance of invertebrate prey items was highest in deep water habitats characterized by medium water velocity (depths > 13.7 m) and coarse substrate (particle sizes > 0.063 mm) in May and June when compared to deep water habitats characterized by low water velocity (<0.2 m.s−1) and fine substrate (particle sizes < 0.063 mm). However, in July, the opposite was observed and prey abundance in juvenile lake sturgeon stomachs decreased with increasing particle size. Results suggest a high degree of dietary overlap among juvenile lake sturgeon from multiple size/age classes occupying deep‐water habitats of the Winnipeg River.

Url:
DOI: 10.1111/jai.12193

Links to Exploration step

ISTEX:1924E211385A50B512AA3943B46203950B459FB1

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<familyName>Peake</familyName>
</personName>
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<personName>
<givenNames>P.</givenNames>
<familyName>Nelson</familyName>
</personName>
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<affiliation countryCode="CA" type="organization" xml:id="jai12193-aff-0001">
<orgName>North/South Consultants Inc.</orgName>
<address>
<city>Winnipeg</city>
<countryPart>Manitoba</countryPart>
<country>Canada</country>
</address>
</affiliation>
<affiliation countryCode="CA" type="organization" xml:id="jai12193-aff-0002">
<orgDiv>Department of Biological Sciences</orgDiv>
<orgName>University of Manitoba</orgName>
<address>
<city>Winnipeg</city>
<countryPart>Manitoba</countryPart>
<country>Canada</country>
</address>
</affiliation>
<affiliation countryCode="CA" type="organization" xml:id="jai12193-aff-0003">
<orgDiv>Department of Biology</orgDiv>
<orgName>University of New Brunswick</orgName>
<address>
<city>Fredericton</city>
<countryPart>New Brunswick</countryPart>
<country>Canada</country>
</address>
</affiliation>
</affiliationGroup>
<fundingInfo>
<fundingAgency>Manitoba Hydro and NSERC</fundingAgency>
<fundingNumber>CRDPJ 321520‐05</fundingNumber>
</fundingInfo>
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<title type="main">Summary</title>
<p>The lake sturgeon,
<i>
<fc>A</fc>
cipenser fulvescens</i>
, is a threatened species across most of its range. To understand any potential shifts in diet across season or habitat, stomach contents were examined from juvenile lake sturgeon caught in the
<fc>W</fc>
innipeg
<fc>R</fc>
iver,
<fc>M</fc>
anitoba,
<fc>C</fc>
anada. This information will aid in assessment of environmental impacts and conservation initiatives for this threatened species. From 2006 to 2008 gut contents were collected from juvenile lake sturgeon using a non‐lethal gastric lavage methodology. Juvenile lake sturgeon were sampled from four discrete deep water habitat types (13.7–27.4 m depths), during the months of
<fc>M</fc>
ay,
<fc>J</fc>
une,
<fc>J</fc>
uly and
<fc>O</fc>
ctober. In total, 13 066 prey items belonging to 14 prey groups were collected from 345 juvenile lake sturgeon (251–835 mm
<fc>TL</fc>
). Overall, juvenile lake sturgeon consumed a low diversity of organisms; insect larvae from three invertebrate orders,
<fc>T</fc>
richoptera,
<fc>D</fc>
iptera and
<fc>E</fc>
phemeroptera, accounted for 97.4% of the total numeric abundance of prey items recovered. A relationship between size of juvenile lake sturgeon and prey quantity or type was not observed. Diet of juvenile lake sturgeon varied in relation to season, with
<fc>D</fc>
iptera (77.6%) being the most abundant prey in
<fc>M</fc>
ay,
<fc>T</fc>
richoptera the most abundant in
<fc>J</fc>
une (n = 3,056, 60.4%) and
<fc>J</fc>
uly (n = 2,055, 52.6%). During October, 96% of stomachs examined were empty. In terms of habitat type, the standardized abundance of invertebrate prey items was highest in deep water habitats characterized by medium water velocity (depths > 13.7 m) and coarse substrate (particle sizes > 0.063 mm) in
<fc>M</fc>
ay and
<fc>J</fc>
une when compared to deep water habitats characterized by low water velocity (<0.2 m.s
<sup>−1</sup>
) and fine substrate (particle sizes < 0.063 mm). However, in July, the opposite was observed and prey abundance in juvenile lake sturgeon stomachs decreased with increasing particle size. Results suggest a high degree of dietary overlap among juvenile lake sturgeon from multiple size/age classes occupying deep‐water habitats of the
<fc>W</fc>
innipeg
<fc>R</fc>
iver.</p>
</abstract>
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<title>Seasonal variation in the diet of juvenile lake sturgeon, Acipenser fulvescens, Rafinesque, 1817, in the Winnipeg River, Manitoba, Canada</title>
</titleInfo>
<titleInfo type="alternative" contentType="CDATA" lang="en">
<title>Seasonal variation in the diet of juvenile lake sturgeon, Acipenser fulvescens, Rafinesque, 1817, in the Winnipeg River, Manitoba, Canada</title>
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<name type="personal">
<namePart type="given">C. C.</namePart>
<namePart type="family">Barth</namePart>
<affiliation>North/South Consultants Inc., Manitoba, Winnipeg, Canada</affiliation>
<affiliation>C. C. Barth, North/South Consultants Inc., 83 Scurfield Blvd., Winnipeg, Manitoba, R3Y 1G4, Canada.E‐mail:</affiliation>
<affiliation>E-mail: cbarth@nscons.ca</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">W. G.</namePart>
<namePart type="family">Anderson</namePart>
<affiliation>Department of Biological Sciences, University of Manitoba, Manitoba, Winnipeg, Canada</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">S. J.</namePart>
<namePart type="family">Peake</namePart>
<affiliation>Department of Biology, University of New Brunswick, New Brunswick, Fredericton, Canada</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">P.</namePart>
<namePart type="family">Nelson</namePart>
<affiliation>North/South Consultants Inc., Manitoba, Winnipeg, Canada</affiliation>
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<publisher>Blackwell Publishing Ltd</publisher>
<dateIssued encoding="w3cdtf">2013-08</dateIssued>
<dateCreated encoding="w3cdtf">2013-03-05</dateCreated>
<dateCaptured encoding="w3cdtf">2012-09-03</dateCaptured>
<dateValid encoding="w3cdtf">2013-02-10</dateValid>
<copyrightDate encoding="w3cdtf">2013</copyrightDate>
</originInfo>
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<languageTerm type="code" authority="rfc3066">en</languageTerm>
<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
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<abstract>The lake sturgeon, Acipenser fulvescens, is a threatened species across most of its range. To understand any potential shifts in diet across season or habitat, stomach contents were examined from juvenile lake sturgeon caught in the Winnipeg River, Manitoba, Canada. This information will aid in assessment of environmental impacts and conservation initiatives for this threatened species. From 2006 to 2008 gut contents were collected from juvenile lake sturgeon using a non‐lethal gastric lavage methodology. Juvenile lake sturgeon were sampled from four discrete deep water habitat types (13.7–27.4 m depths), during the months of May, June, July and October. In total, 13 066 prey items belonging to 14 prey groups were collected from 345 juvenile lake sturgeon (251–835 mm TL). Overall, juvenile lake sturgeon consumed a low diversity of organisms; insect larvae from three invertebrate orders, Trichoptera, Diptera and Ephemeroptera, accounted for 97.4% of the total numeric abundance of prey items recovered. A relationship between size of juvenile lake sturgeon and prey quantity or type was not observed. Diet of juvenile lake sturgeon varied in relation to season, with Diptera (77.6%) being the most abundant prey in May, Trichoptera the most abundant in June (n = 3,056, 60.4%) and July (n = 2,055, 52.6%). During October, 96% of stomachs examined were empty. In terms of habitat type, the standardized abundance of invertebrate prey items was highest in deep water habitats characterized by medium water velocity (depths > 13.7 m) and coarse substrate (particle sizes > 0.063 mm) in May and June when compared to deep water habitats characterized by low water velocity (<0.2 m.s−1) and fine substrate (particle sizes < 0.063 mm). However, in July, the opposite was observed and prey abundance in juvenile lake sturgeon stomachs decreased with increasing particle size. Results suggest a high degree of dietary overlap among juvenile lake sturgeon from multiple size/age classes occupying deep‐water habitats of the Winnipeg River.</abstract>
<note type="funding">Manitoba Hydro and NSERC - No. CRDPJ 321520‐05; </note>
<relatedItem type="host">
<titleInfo>
<title>Journal of Applied Ichthyology</title>
</titleInfo>
<titleInfo type="abbreviated">
<title>J. Appl. Ichthyol.</title>
</titleInfo>
<genre type="journal">journal</genre>
<subject>
<genre>article-category</genre>
<topic>Original Article</topic>
</subject>
<identifier type="ISSN">0175-8659</identifier>
<identifier type="eISSN">1439-0426</identifier>
<identifier type="DOI">10.1111/(ISSN)1439-0426</identifier>
<identifier type="PublisherID">JAI</identifier>
<part>
<date>2013</date>
<detail type="volume">
<caption>vol.</caption>
<number>29</number>
</detail>
<detail type="issue">
<caption>no.</caption>
<number>4</number>
</detail>
<extent unit="pages">
<start>721</start>
<end>729</end>
<total>9</total>
</extent>
</part>
</relatedItem>
<identifier type="istex">1924E211385A50B512AA3943B46203950B459FB1</identifier>
<identifier type="DOI">10.1111/jai.12193</identifier>
<identifier type="ArticleID">JAI12193</identifier>
<accessCondition type="use and reproduction" contentType="copyright">Copyright © 2013 Blackwell Verlag GmbH© 2013 Blackwell Verlag GmbH</accessCondition>
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