EVALUATING THE DIFFERENT FOOD WEB STRUCTURES BETWEEN AN ESTUARY AND A MIDDLE PART OF THE SHIZUGAWA BAY: AN APPLICATION OF TROPHIC MARKER ANALYSES
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- NONAKA Kentaro
- 東北大学大学院工学研究科土木工学専攻
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- FUJIBAYASHI Megumu
- 秋田県立大学生物資源科学部
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- MATSUNO Takumi
- 東北大学大学院工学研究科土木工学専攻
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- NISHIMURA Osamu
- 東北大学大学院工学研究科土木工学専攻
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- SAKAMAKI Takashi
- 東北大学大学院工学研究科土木工学専攻
Bibliographic Information
- Other Title
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- 志津川湾の湾奥河口部と湾中部における動物群集のトロフィックマーカー組成の比較
- シズガワワン ノ ワン オウカコウブ ト ワン チュウブ ニ オケル ドウブツ グンシュウ ノ トロフィックマーカー ソセイ ノ ヒカク
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Abstract
<p> In order to conserve bay ecosystems, it is important to evaluate impacts of anthropogenic environmental alteration on bioligical communities. In this study, we tested whether assessment based on fatty acid composition analysis could differentiate between two local communities with different distances from a river mouth in Shizugawa Bay. As a result, significant differences in marker fatty acid composition were found between predatory fish and benthic consumers as well as between the two sampling locations. The food web near the river mouth depend relatively more on diatom-derived organic matter, while that of the offshore location depended more on green algae-derived organic matter. These retuslts support that the characteristics of local community and food web structures were evaluated by applying fatty acid composition analysis of consumer organisms. Our results also indicated that predatory fish concentrated EPA and DHA of prey thorugh their assimilation. Particularly to further apply fatty acid compositon analysis of predatory fish for the estimation of food web structures as a method of ecosystem assessment in bays, it is further necessary to quantitatively understand the patterns of fatty acid concentration along trophic levels.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)
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Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 75 (7), III_255-III_263, 2019
Japan Society of Civil Engineers