ńͪӚǮ?ҟ̈́ƩƏ͉˝Ӈ̲</?Ǝ͛ėǽ<57àʟŲʛ 1*ǩ͇ҍ» 2ť ӆż 1Ɩэ Ǉ 1Ӌ͇˸Ͳ 1Ҙŗ ĺ 2Altitudinal distribution of large terrestrial isopod and decapod crustaceans onMinami-Iwo-To IslandTetsuro SASAKI1*, Tetsuya YAMADA2, Akitsugu MUKAI1,Sora HORIKOSHI1, Yosuke AMEDA1 & Takumi SEKIGUCHI2
1. ̲ǈҸŻĞ˹ı˵Ë ǞΏŌϠ̩ɺĸͨΆɃӞ100-2101 ʪÊҀǞΏŌʦ̮ǮƽИ͋ӟ
Institute of Boninology, Nishimachi, Chichijima, Ogasawara, Tokyo 100-2101, Japan.
2. w]¥hm¨q KAIZINӞ100-2101 ʪÊҀǞΏŌʦ̮ǮƽƱʦӟ
Diving Service KAIZIN, Okumura, Chichijima, Ogasawara, Tokyo 100-21-1, Japan.
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− 305 −щȥ͂<Ҙ°)7Tҟ̈́ƩƏ͉˝Ӈ?̈́ȼȸƘ?Ɉɣ@ńͪӚǮ?ҟ­̈́ȼΣX̀Р+T­8҈Й;ЙΨ9T oǧ@©Ϧ͖<ƛė?ȜһŐÈǭ<̈́ȳ+T̀˸̱̈́8S̾Ƌ±͍R 42ͿƘū'U7Toǧ?3ōǒ;Ҹ̀ǭȱͿ@ 8 Ϳ<қRUTӞSantamamariaet al., 2013ӟǞΏŌτǮ@ɷǟ;Ҹ̀ǭȱo?ėǽƓ?B958S̀ǭȱƇʚͿ8T[odo Ligia yamanishii ?Ï<˟Ǯ?ӕˋӕƓ<Ýς+TҲҴʭR@bdm¤o Ligia boninensis ăǮQC̮Ǯ?˰Ƕ̅˥ƓR@d¢oLigia torrenticola ͫб'U7TӞNunomura, 1979; Nunomura, 1990; Nunomura et al., 2011ӟ
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TÁ@cg¢]¤d?πʵ?©Ƃ9;47TřϘȱTөӤйћ˭ξ͞ΊϭЊƩǂ?Ͼ͇Ÿ¶ņƢ<@͉˝Ӈ?ɜŕɿ˵<57&ĬСҽ1̾ƌжʴ<7@ӕǴʏƬˣ̌ѝΛˣџϾ˸ˣƀǎĺˣ<&Ńĩҽ1J1ńͪӚǮжʴҢ 2017 QC̕ý˜ңR&Ńĩҽ1Ĉ7?Ңű<̆Ȼй?ȺXЌ+TӪӤȒ͆ɺ̶Ǟϸ«˱§˰҉Бσ (2009) ИЌǮζŕ8Пǖ'U1bbcg¢]¤d<QTbccӇВϏ?©æ. CANCER, 18: 17-18.
Nunomura N (1979) Ligia boninensis, a new isopod crustacean from Hahajima Island, Ogasawara
Islands, Japan. Bulletin of Toyama Science Museum, 1: 37-40.
Nunomura N (1990) Studies on the terrestrial isopod crustaceans in Japan, . Taxonomy of thefamilies of Armadillidiidae, Armadillidae and Tylidae. Bulletin of Toyama Sciense Museum, 13: 158.
Nunomura N, Hiroko H, Sasaki T, Hironaka M, Hariyama T (2011) A new species of the genus Ligia(Crustacea: Isopoda: Ligiidae) from steep streams of Chichijima and Anijima Islands of theOgasawara Islands. Bulletin of Toyama Science Museum, 34: 73-79.

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Paulay G, Starmer J, (2011) Evolution, insular restriction, and extinction of oceanic land crabs,
exemplified by the loss of an endemic Geograpsus in the Hawaii Islands. Plos One,https://doi.org/10.1371/journal.pone.0019916.
Santamaria CA, Mateos M, Taiti S, DeWitt T J, Hurtado LA, (2013). Acomplex evolutionary history in remote archipelago: Phylogeography and Morphometrics of theHawaiian endemic Ligia Isopods. Plos One, https://doi.org/10.1371/journal.pone.0085199.
àʟŲʛ§ƖэŰƬ (2008) ńͪӚǮ?̀˸̱̈́. ǞΏŌͨΆ, 33: 155-171.
Taiti S, Arnedo MA, (2003) Evolution of terrestoriality in Hawaiian species of the genus Ligia (Isopoda,Oniscidea). Crustaceana Monographs 2: 85-102.
˕͇˔øӞ1983ӟńͪӚǮ?ҟ̈́cӇ2Ϳ.ńͪӚǮ?Ϡ̩, ͂ƜȉϠ̩ïлǢӞκӟ  ʃʢ҉̱̈́̈́ͨΆs¥v¨, pp. 379-382.

− 309 −

SUMMARY

Altitudinal distribution of large terrestrial isopod and decapod crustaceans on
Minami-Iwo-To Island
Tetsuro SASAKI1*, Tetsuya YAMADA2, Akitsugu MUKAI1,Sora HORIKOSHI1, Yosuke AMEDA1 & Takumi SEKIGUCHI2
1. Institute of Boninology, Nishimachi, Chichijima, Ogasawara, Tokyo 100-2101, Japan.
2. Diving Service KAIZIN, Okumura, Chichijima, Ogasawara, Tokyo 100-21-1, Japan.
* t-sasaki@ogasawara.or.jp (author for correspondence)
We investigated the altitudinal distribution of large terrestrial crustacea in the genera Ligia(Ligiidae; Isopoda), Coenobita (Coenobitidae; Decapoda), and Geograpsus (Grapsidae; Decapoda) on
Minami-Iwo-To Island. Six species of crustaceans were identified. Distributional ranges along analtitude gradient varied from species to species. Ligia sp., Coenobita perlatus, Geograpsus stormi, andGeograpsus crinipes were distributed in the splash zone, Coenobita purpureus was distributed in thearea from the splash zone to the coastal forest, up to an altitude of about 80 m, and Geograpsus grayi
was distributed from the splash zone to the summit at 900 m.
Key words
Coastal forest, Cloud forest, Habitat, Kazan Island Group, Ogasawara Islands− 310 −

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− 311 −

Ќ 1. жʴƌ̥?ÝςQC͂ƜжʴɄ˵Table 1. Location of survey site, environmental factors, survey method.
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A: oǧ?©Ϳ, ̀ǭ BC Ðџ?Ӊ˯ǿ; B: meobcc , ̀ǭ BC Ðџ?Ӊ˯ǿ; C: bbcg¢]¤d, ̀ǭ BC 9[c|zw]q?җ?Ӊ˯ǿ; D: bbcg¢]¤d?ɍŊóá, ̀ǭ BC 9[c|zw]q?җ?Ӊ˯ǿ; E: cg¢]¤d,500m k¡ƌ̥?̀Ә?π˛ǸĎ; F: cg¢]¤dӢ̀Ә?ŊXəӊ)71óá, [c|zw]q?̀Әπ˛ǸĎ.
Figure 2. Terestrial large crustaceans recorded in the survey.
A: Ligia sp.; B: Coenobita perlatus; C: Geograpsus crinipes; D: G. crinipes brooding of eggs ; E:Geograpsus grayi; F: G. grayi preying a seabird egg.

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ABCDEFGHIƆ 3. cg¢]¤d Geograpsus grayi ?Ϫțƣ͐
A: CIBAP-P20170007, ˋӕ 500m ƌ̥; B: CIBAP-P20170010, ˋӕ 500m ƌ̥; C: CIBAPP20170003, ˋӕ 440m ƌ̥; D: CIBAP-P20170001, ˋӕ 470m ƌ̥; E: CIBAP-P20170005, ˋӕ 300m ƌ̥; F: CIBAP-P20170002, ˋӕ 430m; G: CIBAP-P20170006, ˋӕ 500m ƌ̥; H:CIBAP-P20170008, ˋӕ 500m; I: CIBAP-P20170009, ˋӕ 900m ƌ̥.
Figure 3. Color variations of Geograpsus grayi.
A: CIBAP-P20170007, collected from an altitude of 500m; B: CIBAP-P20170010, collected from analtitude of 500m; C: CIBAP-P20170003, collected from an altitude of 440m; D: CIBAP-P20170001,
collected from an altitude of 470m; E: CIBAP-P20170005, collected from an altitude of 300m; F:CIBAP-P20170002, collected from an altitude of 430m; G: CIBAP-P20170006, collected from analtitude of 500m; H: CIBAP-P20170008, collected from an altitude of 500m; I: CIBAP-P20170009,
collected from an altitude of 900m.

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