Sakai Mai, Kita Yuki F, Kogi Kazunobu, Shinohara Masanori, Morisaka Tadamichi, Shiina Takashi, Inoue-Murayama Miho
Department of Fisheries, Kindai University, 3327-204 Nakamachi, Nara, 631-8505, Japan.
Department of Marine Biology and Sciences School of Biological Sciences, Tokai University, 5-1-1 Minamisawa, Minami-ku, Sapporo-shi, Hokkaido 005-8601, Japan.
Sci Rep. 2016 Apr 6;6:23902. doi: 10.1038/srep23902.
Alloparental behaviour and adoption have been reported in many mammals and birds. Such behaviours are energetically costly, and their causes and functions remain unclear. We observed the adoption behaviour of a wild Indo-Pacific bottlenose dolphin (Tursiops aduncus) near Mikura Island, Japan. A calf was seen with its mother on six observation days. Following the mother's death, the calf was observed with a sub-adult female on all 18 observation days from May to September 2012. On three days, the calf was observed swimming with this female in the suckling position and milk was seen leaking from the female's mammary slit. A five-year dataset revealed no significant social or kin relationships between the biological mother and allomother, indicating that kinship and social relationships did not play an important role in the observed adoption.
在许多哺乳动物和鸟类中都有报道过异亲行为和收养行为。此类行为在能量消耗上代价高昂，其成因和功能仍不明确。我们观察了日本御藏岛附近一头野生印太瓶鼻海豚（宽吻海豚）的收养行为。在六个观察日里，一头幼崽与其母亲在一起被观察到。母亲死后，在2012年5月至9月的所有18个观察日里，这头幼崽都与一头亚成年雌性在一起被观察到。在三天里，观察到这头幼崽以哺乳姿势与该雌性一起游动，并且看到有乳汁从雌性的乳腺裂口中渗出。一个为期五年的数据集显示，生母与异亲之间不存在显著的社会或亲缘关系，这表明亲缘关系和社会关系在观察到的收养行为中并未起到重要作用。
