Nishiwaki, Masaharu

12 publications

Nishiwaki, Masaharu (detail)
1967Distribution and migration of marine mammals in the North Pacific area.
Bull. Ocean Res. Inst. Univ. Tokyo No. 1: 1-64. 22 figs. 8 pls. Dec. 1967.
—Sirs., 7-8?
Nishiwaki, Masaharu (detail)
1968Dugong and manatee.
Animals and Zoo 20(2): 48-51.
—In Japanese.
Nishiwaki, Masaharu (detail)
1972General biology. In: S. H. Ridgway (ed.), Mammals of the sea: biology and medicine.
Springfield (Illinois), Charles C Thomas (812 pp.): 3-204.
—Sirs., 192-200.
Nishiwaki, Masaharu (detail)
1977Ecology of the dugong and its management.
Mar. Res. Indonesia No. 19: 1-6. 1 tab. 1 fig.
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Kasuya, Toshio; Nishiwaki, Masaharu (detail)
1978On the age characteristics and anatomy of the tusk of Dugong dugon.
Sci. Rept. Whales Res. Inst. No. 30: 301-310. 1 tab. 3 figs. 4 pls. Dec. 1978.
—Monthly and annual growth layers identified in tusks; females thought to be sexually mature at about 10 years and to live at least 45 years.
Nishiwaki, Masaharu (detail)
1978Recent distribution and status of Dugong. [Abstr.]
Congressus Theriol. Internatl. 2: 94. Illus.
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Nishiwaki, Masaharu; Kasuya, Toshio; Miyazaki, Nobuyuki; Tobayama, Teruo; Kataoka, Teruo (detail)
1979Present 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).
Nishiwaki, Masaharu; Kasuya, Toshio; Tobayama, Teruo; Miyazaki, Nobuyuki; Kataoka, Teruo (detail)
1981Distribution of the dugong (Dugong dugon) in the world. 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): 8-9.
—Abstr. of Nishiwaki et al. (1979).
Nishiwaki, Masaharu; Yamaguchi, M.; Shokita, S.; Uchida, Senzo; Kataoka, Teruo (detail)
1982Recent survey on the distribution of the African manatee.
Sci. Rept. Whales Res. Inst. No. 34: 137-147. 2 figs. Dec. 1982.
—An interview survey in 1980-81 found evidence of T. senegalensis mainly in the Niger River and its tributaries; also in the Sanaga and Ivindo Rivers in Cameroon and Gabon, respectively; and in Gambia, Ivory Coast, and Ghana to some extent. They were found to be scarce or absent elsewhere, and not found at all in salt water. [More recent work by J. A. Powell, Jr., casts doubt on the accuracy of many statements in this report.] Points out the need for an international conservation strategy for the manatee.
Nishiwaki, Masaharu (detail)
1984aCurrent status of the African manatee.
Acta Zool. Fennica No. 172: 135-136.
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Nishiwaki, Masaharu (detail)
1984bSignificance of 55° S in the 'Indian Ocean Sanctuary of Whales' in relation to the distribution of marine mammals.
Mem. Natl. Inst. Polar Res., Special Issue No. 32: 122-129. Illus.
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Nishiwaki, Masaharu; Marsh, Helene D. (detail)
1985Dugong, Dugong dugon (Müller, 1776). In: S. H. Ridgway & R. J. Harrison (eds.), Handbook of marine mammals. Vol. 3.
London, Academic Press: 1-31. 1 tab. 10 figs.
—Rev.: G.B. Rathbun, Mar. Mamm. Sci. 2(3): 236-237, Jul. 1986.