TY - JOUR
T1 - Carabid beetles (Carabus blaptoides) from Nii-jima and O-shima isles, Izu-Bonin oceanic islands
T2 - Dispersion by Kuroshio current and the origin of the insular populations
AU - Osozawa, Kyoji
AU - Ogino, Shuichi
AU - Osozawa, Soichi
AU - Oba, Yuichi
AU - Wakabayshi, John
N1 - Publisher Copyright:
© 2016 by Koninklijke Brill NV, Leiden, The Netherlands.
PY - 2016
Y1 - 2016
N2 - Carabus blaptoides is endemic on the Japanese islands. Two populations of this species were recently found on the oceanic islets of O-shima and Nii-jima, offshore of central Japan. We evaluate the origin of these populations based on morphological and molecular phylogenetic analyses. Molecular analyses show that the O-shima population is closely related to the Boso peninsula population of Honshu, and the Nii-jima population is closely related to the northern Kyushu population. We suggest that the Boso population migrated relatively recently from central Japan, apparently by way of a land bridge formed by an emergent forearc high, followed by further migration to O-shima. In contrast, the Nii-jima population migrated very recently from northern Kyushu, probably by rafting on the Kuroshio current aboard driftwood swept into the sea from floods that occurred in the Ariake bay area in 2012. Similar Kuroshio-driven migration is also expected for the ancient Izu-Bonin oceanic islands.
AB - Carabus blaptoides is endemic on the Japanese islands. Two populations of this species were recently found on the oceanic islets of O-shima and Nii-jima, offshore of central Japan. We evaluate the origin of these populations based on morphological and molecular phylogenetic analyses. Molecular analyses show that the O-shima population is closely related to the Boso peninsula population of Honshu, and the Nii-jima population is closely related to the northern Kyushu population. We suggest that the Boso population migrated relatively recently from central Japan, apparently by way of a land bridge formed by an emergent forearc high, followed by further migration to O-shima. In contrast, the Nii-jima population migrated very recently from northern Kyushu, probably by rafting on the Kuroshio current aboard driftwood swept into the sea from floods that occurred in the Ariake bay area in 2012. Similar Kuroshio-driven migration is also expected for the ancient Izu-Bonin oceanic islands.
KW - Boso peninsula
KW - colonization
KW - flood
KW - fore arc high
KW - land bridge
KW - northern Kyushu
KW - origin
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U2 - 10.1163/1876312X-47022135
DO - 10.1163/1876312X-47022135
M3 - Article
AN - SCOPUS:84977268269
VL - 47
SP - 93
EP - 111
JO - Insect Systematics and Evolution
JF - Insect Systematics and Evolution
SN - 1399-560X
IS - 2
ER -