Mercury Contents of the Tissues and Feathers of Black-Tailed Gulls on Kabushima (Kabu Island), Aomori, Japan Goto, Ryota and Ohura, Takeshi and Mizutani, Yuichi and Niizuma, Yasuaki, Ornithological Science, 17, 113-118 (2018), DOI:http://dx.doi.org/10.2326/osj.17.113