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Abstract：
During the autumn migration of many waterfowls, body mass is lowest upon arrival at the wintering area and gradually increases during the winter. Consequently, body mass is highest before the spring migration. We studied the pattern of body mass changes in the Black-Headed Gull (Larus ridibundus) from December 2010 to December 2016 in the Shinhama area of Chiba, Japan. Based on 327 captured animals, body mass increased during the wintering period, but tended to decrease before migration. In 2014-2016, a muscle mass reduction in females was observed, explaining the change in body mass. However, the observed weight loss may be caused by many factors, which may be related to the migratory ecology of the regional population.
摘要：
在许多水禽的秋季迁徙期间，体重在到达越冬区时最低，冬季逐渐增加。因此,体重在春季迁徙前最高。我们研究了2010年12月至2016年12月在千叶Shhama地区的黑头海鸥（Larusridibundus）的体重变化模式，日本。基于327只捕获的动物，体重在越冬期间增加，但在迁移前趋于下降。在2014-2016年，观察到女性的肌肉量减少，解释体重的变化.然而,观察到的体重减轻可能是由许多因素引起的，这可能与该地区人口的迁徙生态有关。
