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                    ホーム > 長崎大学について > 大学からのお知らせ > 学術情報一覧 > 圃場整備により生息地のつながりが失われると、 水田の最上位捕食者タガメの栄養段階が低下することを発見

                    ここから本文です。

                    圃場整備により生息地のつながりが失われると、 水田の最上位捕食者タガメの栄養段階が低下することを発見

                    2019年07月30日

                    長崎大学教育学部 大庭伸也准教授・鈴木滉大氏(2013年度教育学部卒)、京都大学 酒井陽一郎博士(現 滋賀県琵琶湖環境科学研究センター)・柴田淳也博士(現 広島大学環境安全センター)・奥田昇准教授(現 総合地球環境学研究所)らの研究グループは、圃場整備により生じた水田と水路の段差が魚の往来を阻み、水田の上位捕食者・タガメの栄養段階(生産者からの食物連鎖の長さ)を低下させることを発見しました。

                    田んぼはお米を作るだけでなく、自然湿地の代わりとして湿地にすむ生き物にとっても重要な場所であることが近年、指摘されています。しかし、排水を促すために水路との段差を大きくした水田では、魚が水田で繁殖できなくなるだけでなく、魚を食べる捕食者の食性(食べ物)にも影響することが懸念されます。

                    水路との段差がある水田とない水田で、水田生態系の上位捕食者であるタガメの食性を比較した結果、タガメは後者の水田でのみ栄養段階の高い魚類を捕食していました。さらに、窒素・炭素安定同位体比分析を用いてタガメの栄養段階(生産者からタガメにいたる食物連鎖の長さ)を比較したところ、後者の水田では前者の水田より食物連鎖が長いことが明らかとなりました。

                    また、本研究は、成虫の足先の組織や幼虫の脱皮殻の窒素・炭素安定同位体を分析することで、絶滅危惧種であるタガメ野生集団の生態を生きたまま調査する技術を確立したことも評価されています。

                    本研究の成果は淡水生物学の国際誌「Freshwater Biology」に掲載されました。

                    Ohba S, Suzuki K, Sakai Y, Shibata J, Okuda N (2019) Effects of irrigation system alterations on the trophic position of a threatened top predator in rice-field ecosystems. Freshwater Biology, Early View on 24th June 2019

                    https://onlinelibrary.wiley.com/doi/abs/10.1111/fwb.13365

                    図
                    *クリックして拡大(PDF:101KB)

                    より詳しい研究内容情報は以下までお問い合わせください。

                    長崎大学 教育学部数理情報講座
                    准教授 大庭 伸也
                    Tel:095-819-2393   E-mail:ooba*nagasaki-u.ac.jp
                                                        (*を@に変換して下さい)

                    <機関窓口>
                    長崎大学 広報戦略本部
                    TEL:095-819-2007   E-mail:kouhou*ml.nagasaki-u.ac.jp
                                                         (*を@に変換して下さい)

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