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{'富栄養湖である諏訪湖では例年夏季に有毒藍Microcystisのブルームが発生する。諏訪湖からの流出河川である天竜川において,1998年7月から10月の河川水中のMicrocystis細胞濃度を調査したところ,諏訪湖から32km下流までMicrocystis細胞が観察された。7月から9月中旬にはMicrocystisの細胞濃度は16.5km流下する間に13%,32km下流では8%まで減少した。9月下旬から10月には流下に伴うMicrocystis細胞濃度の減少は緩やかになり,32km下流においても63%のMicrocysris細胞が残存していた。移流拡散モデルを適用し天竜川におけるMicrocystisの動態を解析した結果,Microcystisの細胞濃度は河川の流量変化に最も大きく依存した。またMicrocystis細胞およびコロニーの沈降と河床の濾過作用によっても河川水中のMicrocystis細胞濃度が減少することが示唆された。これは水生昆虫によりMicrocystisが摂食される可能性を示す。従って天竜川において藍藻毒が生態系上位の生物に移行する可能性がある。': [0]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2334984553', 'counts_by_year': [{'year': 2021, 'cited_by_count': 1}, {'year': 2015, 'cited_by_count': 1}], 'updated_date': '2024-09-18T02:42:17.810667', 'created_date': '2016-06-24'}