第56次日本南極地域観測・外国共同観測「リビングストン島バイヤーズ半島部でのスペイン共同湖沼観測」報告

• Main Authors: 工藤 栄, 田邊 優貴子, Sakae Kudoh, Yukiko Tanabe
• Format: Report
• Language: Japanese
• Published: 報告 2015
• Subjects: Antarctic; Byers; Byers peninsula; Livingstone; Livingstone Island; South Shetland Islands; West Antarctica; Antarc*; Antarctica
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=10945; http://id.nii.ac.jp/1291/00010902/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=10945&item_no=1&attribute_id=18&file_no=1

第56次日本南極地域観測・外国共同観測として，海洋性南極に位置するサウスシェトランド諸島リビングストン島のバイヤーズ半島部に広がる露岩上の湖とその周辺でのスペインとの共同観測に参加した．多雪で丘陵部湖沼群が融解せず表出もしていない状況の中，2015年1月12-25日の野外調査期間において，丘陵部の3湖沼ならびに海岸部の3潟湖での湖沼観測を実施し，その周辺集水域から物質循環研究のための土壌・生物試料の採集を行った．丘陵部湖沼内には海洋性南極湖沼の特徴である動物プランクトン群集が認められ，また，夏季においていまだ逆成層構造をとり，湖水循環が生じずに底層水で酸素欠乏状態となっている現象を捉えた．海鳥類・大型哺乳類の繁殖活動の影響を強く受けていると考えられる潟湖およびその周辺河川での水質測定と試料採集も実施した． A study on the limnological and ecological characteristics of maritime Antarctic lakes on Byers Peninsula, Livingstone Island, South Shetland Islands, West Antarctica, was conducted by the Spanish Antarctic Research Campaign during the 2014/15 season, in cooperation with the research program of the 56th Japanese Antarctic Research Expedition. Limnological surveys of three hillside lakes and three lagoons near beaches were conducted under conditions of heavy snow cover. Soils and biological samples in the catchment areas of the lakes and lagoons were also collected and analyzed. The hillside lakes were covered by thick ice and snow, which maintained winter water conditions in the lakes, such as irreversible stratification, oxygen depletion of bottom water, very weak underwater light conditions, etc., even in mid-January, although swimming zooplankton were abundant. Water samples were also collected in coastal lagoons and streams, an environment in which birds and marine mammals transport materials through the aquatic system.