[MARMAM] New Publication: Emigration of Indo-Pacific Bottlenose Dolphins (Tursiops aduncus) from Mikura Island, Japan

Kimika Tsuji kimika0926t at gmail.com
Tue Nov 14 02:04:49 PST 2017

Dear MARMAM colleagues,

We are pleased to announce the publication of the following paper in
Aquatic Mammals.

Kimika Tsuji, Kazunobu Kogi, Mai Sakai, and Tadamichi Morisaka. (2017).
Emigration of Indo-Pacific Bottlenose Dolphins (*Tursiops aduncus*) from
Mikura Island, Japan. *Aquatic Mammals*, 43(6), 585-593.

Abstract: Emigration of individual animals is an important biological
phenomenon that depends on both populations and ecosystem attributes. Off
Mikura Island, a long-term identification survey of individual Indo-Pacific
bottlenose dolphins has been conducted since 1994 using an underwater video
system. Between 1994 and 2014, 277 individual dolphins were identified by
this survey, with 41 individuals emigrating from Mikura Island during this
period. Adults emigrated significantly more often than younger age classes.
The sex and age classes of emigrants in 2008 and 2010 (the years with the
greatest amount of emigration) differed, suggesting that social
relationships within a population may affect emigration. Emigrants were
observed among the Izu Island Chain and in Chiba, Shizuoka, Mie, and
Wakayama Prefectures. The greatest distance dolphins emigrated from Mikura
Island was 390 km to Tanabe in Wakayama Prefecture. Some individuals were
observed to have emigrated to several areas during the period. The most
frequent destination was Toshima Island, one of the Izu Islands Chain,
where emigrants have been observed to reproduce. Emigrant groups were
composed exclusively of individuals from Mikura Island; there were no
immigrants to the Mikura Island area during the 20-y period of observation,
although six emigrants eventually returned to their original range. Future
studies of social relationships and habitat use by emigrants will reveal
more about the reasons dolphins leave their habitats.

The article is available at https://doi.org/10.1578/AM.43.6.2017.585

Best regards,

Kimika Tsuji

Kimika TSUJI
Wildlife Research Center of Kyoto University
2-24 Tanaka-Sekiden-cho, Sakyo-ku, Kyoto 606-8203, Japan
E-mail: tsuji at wrc.kyoto-u.ac.jp
Tel: (+81)75-771-4399 <+81%2075-771-4399>
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