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Nishiwaki, Masaharu; Kasuya, Toshio; Miyazaki, Nobuyuki; Tobayama, Teruo; Kataoka, Teruo
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1979 |
Present distribution of the dugong in the world.
Sci. Rept. Whales Res. Inst. No. 31: 133-141. 2 figs. Dec. 1979.
–Abstr.: Nishiwaki et al. (1981). Summarizes dugong distribution based on interview surveys, and recognizes 5 more or less discrete areas of relatively continuous distribution: eastern Australia, eastern Papua New Guinea, and Melanesia; western Australia, Moluccas, and Philippines; Sumatra, Malaysia, and Andamans; India and Sri Lanka; and East Africa and Madagascar. Suggests that dugong populations in the latter two regions are declining, and offers a population guesstimate of 30,000 animals worldwide. Cites records of rare dugong occurrences at Guam and Yap; discusses the roles of water temperature and ocean currents in dugong distribution; and notes the issuance of dugong postage stamps by the Ryukyus (in 1966) and Tanzania (in 1977).
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Miyazaki, Nobuyuki; Itano, Kazuomi; Fukushima, Minoru; Kawai, Shin-ichiro
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1981 |
Contamination by mercury and organochlorine compounds in the muscle of the dugong on Celebes Island. [Abstr.] In: H. Marsh (ed.), The dugong. Proceedings of a seminar/workshop held at James Cook University of North Queensland 8-13 May 1979 (q.v.).
[Townsville (Australia)], James Cook Univ. (vii + 400): 175.
–Abstr. of Miyazaki et al. (1979).
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Kikuchi, Mumi; Silva, Vera Maria Ferreira da; Rosas, Fernando César Weber; Souza, Diogo; Miyazaki, Nobuyuki
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2012 |
The implications of turning behaviour performed by Amazonian manatees after release into the wild.
Journal of Ethology 30(1): 187-190. 1 tab. 2 figs. DOI:10.1007/s10164-011-0290-0. Jan. 2012.
–ABSTRACT: Sirenians have dichromatic colour vision and tactile hairs but have not developed underwater echolocation. Amazonian manatees (Trichechus inunguis) live in turbid water and it has been unclear how they understand their surroundings. In this study, we recorded the 3D movements of two captive-raised Amazonian manatees. The results revealed that the manatees always swam in a circular pattern. Both animals used slower, narrower turning motions as they approached the flooded forests, which are abundant in aquatic vegetation. Therefore, we suggest that these two manatees swam in a circular pattern to detect all directions of their surroundings especially using sensitive facial bristles.
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