The seasonal trophic link between Great Cormorant Phalacrocorax carbo and ayu Plecoglossus altivelis altivelis reared for mass release
The feeding ecology of Great Cormorants ( Phalacrocorax carbo ) during the breeding season in the Kano River basin, central Japan, was examined to clarify the trophic relationship between the cormorants and ayu ( Plecoglossus altivelis altivelis ) reared for mass release in the river. The ayu was mo...
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| Veröffentlicht in: | Ecological research 2018-09, Vol.33 (5), p.935-948 |
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| creator | Takai, Noriyuki Kawabe, Koh Togura, Kenta Kawasaki, Kentaro Kuwae, Tomohiro |
| description | The feeding ecology of Great Cormorants (
Phalacrocorax carbo
) during the breeding season in the Kano River basin, central Japan, was examined to clarify the trophic relationship between the cormorants and ayu (
Plecoglossus altivelis altivelis
) reared for mass release in the river. The ayu was most frequently found in stomachs of cormorants culled during the breeding season, despite relatively poor catch in the year-round fish fauna research in the watershed. Carbon and nitrogen stable isotope ratios of some ayu individuals extracted from the stomachs of the culled cormorants were similar to the isotopic values of ayu caught in the watershed, whereas the other stomach-content ayu showed peculiarly high nitrogen isotopic values, clearly distinct from the values of the ayu caught in the watershed, and overlapped with the values of mass-release ayu. Furthermore, isotopic values of past diets inferred by the isotope analysis of livers of the culled cormorants were closer to the values of the mass-release ayu, relative to the past diet values inferred by the analysis of the cormorant muscles. This suggests that the food supply from the mass-release ayu had increased in the breeding season, since the isotopic turnover rate is faster in livers than in muscles. The huge number of formula-fed ayu released in the watershed create an anthropogenic food chain which is assumed to significantly support the breeding of the cormorants. |
| doi_str_mv | 10.1007/s11284-018-1610-4 |
| format | Article |
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Phalacrocorax carbo
) during the breeding season in the Kano River basin, central Japan, was examined to clarify the trophic relationship between the cormorants and ayu (
Plecoglossus altivelis altivelis
) reared for mass release in the river. The ayu was most frequently found in stomachs of cormorants culled during the breeding season, despite relatively poor catch in the year-round fish fauna research in the watershed. Carbon and nitrogen stable isotope ratios of some ayu individuals extracted from the stomachs of the culled cormorants were similar to the isotopic values of ayu caught in the watershed, whereas the other stomach-content ayu showed peculiarly high nitrogen isotopic values, clearly distinct from the values of the ayu caught in the watershed, and overlapped with the values of mass-release ayu. Furthermore, isotopic values of past diets inferred by the isotope analysis of livers of the culled cormorants were closer to the values of the mass-release ayu, relative to the past diet values inferred by the analysis of the cormorant muscles. This suggests that the food supply from the mass-release ayu had increased in the breeding season, since the isotopic turnover rate is faster in livers than in muscles. The huge number of formula-fed ayu released in the watershed create an anthropogenic food chain which is assumed to significantly support the breeding of the cormorants.</description><identifier>ISSN: 0912-3814</identifier><identifier>EISSN: 1440-1703</identifier><identifier>DOI: 10.1007/s11284-018-1610-4</identifier><language>eng</language><publisher>Tokyo: Springer Japan</publisher><subject>Anthropogenic factors ; Behavioral Sciences ; Biomedical and Life Sciences ; Breeding ; Breeding seasons ; Diet ; Ecology ; Evolutionary Biology ; Fish ; Fish fauna ; Food chain ; Food chains ; Food supply ; Foods ; Foraging behavior ; Forestry ; Isotope ratios ; Life Sciences ; Mass ; Muscles ; Nitrogen ; Original Article ; Phalacrocorax carbo ; Plant Sciences ; Plecoglossus altivelis altivelis ; Ratios ; River basins ; Rivers ; Seabirds ; Seasons ; Stable isotope ; Stable isotopes ; Stomach ; Stomach content ; Trophic relationships ; Turnover rate ; Watersheds ; Zoology</subject><ispartof>Ecological research, 2018-09, Vol.33 (5), p.935-948</ispartof><rights>The Author(s) 2018</rights><rights>2018 The Ecological Society of Japan</rights><rights>Ecological Research is a copyright of Springer, (2018). All Rights Reserved. © 2018. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4335-2f6cb27b9b821f19d97aef4e43ac443bb02f8c8de673dbdbae6d622dc779c993</citedby><cites>FETCH-LOGICAL-c4335-2f6cb27b9b821f19d97aef4e43ac443bb02f8c8de673dbdbae6d622dc779c993</cites><orcidid>0000-0003-1557-7411</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s11284-018-1610-4$$EPDF$$P50$$Gspringer$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s11284-018-1610-4$$EHTML$$P50$$Gspringer$$Hfree_for_read</linktohtml><link.rule.ids>314,780,784,1416,27922,27923,41486,42555,45572,45573,51317</link.rule.ids></links><search><creatorcontrib>Takai, Noriyuki</creatorcontrib><creatorcontrib>Kawabe, Koh</creatorcontrib><creatorcontrib>Togura, Kenta</creatorcontrib><creatorcontrib>Kawasaki, Kentaro</creatorcontrib><creatorcontrib>Kuwae, Tomohiro</creatorcontrib><title>The seasonal trophic link between Great Cormorant Phalacrocorax carbo and ayu Plecoglossus altivelis altivelis reared for mass release</title><title>Ecological research</title><addtitle>Ecol Res</addtitle><description>The feeding ecology of Great Cormorants (
Phalacrocorax carbo
) during the breeding season in the Kano River basin, central Japan, was examined to clarify the trophic relationship between the cormorants and ayu (
Plecoglossus altivelis altivelis
) reared for mass release in the river. The ayu was most frequently found in stomachs of cormorants culled during the breeding season, despite relatively poor catch in the year-round fish fauna research in the watershed. Carbon and nitrogen stable isotope ratios of some ayu individuals extracted from the stomachs of the culled cormorants were similar to the isotopic values of ayu caught in the watershed, whereas the other stomach-content ayu showed peculiarly high nitrogen isotopic values, clearly distinct from the values of the ayu caught in the watershed, and overlapped with the values of mass-release ayu. Furthermore, isotopic values of past diets inferred by the isotope analysis of livers of the culled cormorants were closer to the values of the mass-release ayu, relative to the past diet values inferred by the analysis of the cormorant muscles. This suggests that the food supply from the mass-release ayu had increased in the breeding season, since the isotopic turnover rate is faster in livers than in muscles. The huge number of formula-fed ayu released in the watershed create an anthropogenic food chain which is assumed to significantly support the breeding of the cormorants.</description><subject>Anthropogenic factors</subject><subject>Behavioral Sciences</subject><subject>Biomedical and Life Sciences</subject><subject>Breeding</subject><subject>Breeding seasons</subject><subject>Diet</subject><subject>Ecology</subject><subject>Evolutionary Biology</subject><subject>Fish</subject><subject>Fish fauna</subject><subject>Food chain</subject><subject>Food chains</subject><subject>Food supply</subject><subject>Foods</subject><subject>Foraging behavior</subject><subject>Forestry</subject><subject>Isotope ratios</subject><subject>Life Sciences</subject><subject>Mass</subject><subject>Muscles</subject><subject>Nitrogen</subject><subject>Original Article</subject><subject>Phalacrocorax carbo</subject><subject>Plant Sciences</subject><subject>Plecoglossus altivelis 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seasonal trophic link between Great Cormorant Phalacrocorax carbo and ayu Plecoglossus altivelis altivelis reared for mass release</title><author>Takai, Noriyuki ; Kawabe, Koh ; Togura, Kenta ; Kawasaki, Kentaro ; Kuwae, Tomohiro</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4335-2f6cb27b9b821f19d97aef4e43ac443bb02f8c8de673dbdbae6d622dc779c993</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Anthropogenic factors</topic><topic>Behavioral Sciences</topic><topic>Biomedical and Life Sciences</topic><topic>Breeding</topic><topic>Breeding seasons</topic><topic>Diet</topic><topic>Ecology</topic><topic>Evolutionary Biology</topic><topic>Fish</topic><topic>Fish fauna</topic><topic>Food chain</topic><topic>Food chains</topic><topic>Food supply</topic><topic>Foods</topic><topic>Foraging behavior</topic><topic>Forestry</topic><topic>Isotope ratios</topic><topic>Life 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trophic link between Great Cormorant Phalacrocorax carbo and ayu Plecoglossus altivelis altivelis reared for mass release</atitle><jtitle>Ecological research</jtitle><stitle>Ecol Res</stitle><date>2018-09</date><risdate>2018</risdate><volume>33</volume><issue>5</issue><spage>935</spage><epage>948</epage><pages>935-948</pages><issn>0912-3814</issn><eissn>1440-1703</eissn><abstract>The feeding ecology of Great Cormorants (
Phalacrocorax carbo
) during the breeding season in the Kano River basin, central Japan, was examined to clarify the trophic relationship between the cormorants and ayu (
Plecoglossus altivelis altivelis
) reared for mass release in the river. The ayu was most frequently found in stomachs of cormorants culled during the breeding season, despite relatively poor catch in the year-round fish fauna research in the watershed. Carbon and nitrogen stable isotope ratios of some ayu individuals extracted from the stomachs of the culled cormorants were similar to the isotopic values of ayu caught in the watershed, whereas the other stomach-content ayu showed peculiarly high nitrogen isotopic values, clearly distinct from the values of the ayu caught in the watershed, and overlapped with the values of mass-release ayu. Furthermore, isotopic values of past diets inferred by the isotope analysis of livers of the culled cormorants were closer to the values of the mass-release ayu, relative to the past diet values inferred by the analysis of the cormorant muscles. This suggests that the food supply from the mass-release ayu had increased in the breeding season, since the isotopic turnover rate is faster in livers than in muscles. The huge number of formula-fed ayu released in the watershed create an anthropogenic food chain which is assumed to significantly support the breeding of the cormorants.</abstract><cop>Tokyo</cop><pub>Springer Japan</pub><doi>10.1007/s11284-018-1610-4</doi><tpages>14</tpages><orcidid>https://orcid.org/0000-0003-1557-7411</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | Ecological research, 2018-09, Vol.33 (5), p.935-948 |
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| language | eng |
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| subjects | Anthropogenic factors Behavioral Sciences Biomedical and Life Sciences Breeding Breeding seasons Diet Ecology Evolutionary Biology Fish Fish fauna Food chain Food chains Food supply Foods Foraging behavior Forestry Isotope ratios Life Sciences Mass Muscles Nitrogen Original Article Phalacrocorax carbo Plant Sciences Plecoglossus altivelis altivelis Ratios River basins Rivers Seabirds Seasons Stable isotope Stable isotopes Stomach Stomach content Trophic relationships Turnover rate Watersheds Zoology |
| title | The seasonal trophic link between Great Cormorant Phalacrocorax carbo and ayu Plecoglossus altivelis altivelis reared for mass release |
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