Structure of marine ecosystem under fast sea-ice: insight from stable-isotope analysis

第3回極域科学シンポジウム/第34回極域生物シンポジウム 11月26日（月） 統計数理研究所 ３階セミナー

Seasonal change in the diet of Adélie Penguins: insight from stable-isotope analysis

第2回極域科学シンポジウム/第33回極域生物シンポジウム 11月17日（木） 統計数理研究所 3階リフレッシュフロ

女子学生生徒を対象としたストレスコーピングに関する研究

In the present age, learning environments of school has changed. Space for the play ground has vanished because of urbanization and urban renewal, lifestyle has changed over to unsocial and the connections of human relations have decreased. Such a change affects mind and body. These changes cause bullying, school refusal, social with draw, depression, withdrawal, indifference. The stress that is one of these causes becomes a big social problem ; the reason is that stress gives bad influence for mind and body of children. When the stress is prolonged, it is influenced for eating habits and rhythm of the life, various symptoms in the mind and body appear. This becomes the factor which induces a new stress. These are making mind and body produce distortion, and cause an illness of the heart. Therefore, a modern\u27s quality of life is reduced. Based on such a present status, I paid attention to breathing method as means to reduce stress. The effectiveness of breathing method is demonstrated in many precedent studies. However, there are few studies that considered a student to be an investigation subject. Breathing method is based on yoga breathing. It promotes the blood circulation and stabilizes an autonomic nervous system. In addition, it promotes activity of the internal organs. It that is to say leads to reduction of stress. Therefore I used breathing method as stress coping and inspected the effect. A purpose of this study is to contribute to reduction of stress and improvement of Quality of Life

Migratory movements and winter diving activity of Adélie penguins in East Antarctica

Seabirds breeding on the Antarctic continent must cope with extreme changes in sea ice cover and day length throughout the year. Adélie penguins are expected to adjust their migratory movements and diving activity to seasonal changes in foraging conditions, but their winter diving activities have not been examined previously. Here, we tracked 18 and 5 Adélie penguins by using geolocators with and without depth sensors, from a colony in East Antarctica over 2 winter seasons. After breeding, all but one penguin migrated westward from March to April, then moved northward from May to August as the sea ice edge extended to the north, then moved southeastward, returning towards the breeding colony. Migratory movements followed sea ice movements and the seasonal extension in this region, which is influenced by the west-flowing Antarctic Slope Current and wind. Penguins dived deeper during winter, reaching a maximum depth of 129 m. The birds dived mostly between civil dawn and dusk, and tended to stay on ice overnight. Diving effort (total time spent underwater per day) did not decline with sea ice concentrations, suggesting that penguins found open water to dive even with >90% sea ice cover. Diving effort was lowest around the winter solstice, but was relatively high before and after the annual moult, and also before the start of breeding when birds presumably needed to accumulate body reserves. Our results highlight how the migratory movement and winter diving activity of Adélie penguins are closely associated with the seasonal polar environment