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Psyche
Volume 2015, Article ID 712093, 6 pages
http://dx.doi.org/10.1155/2015/712093
Research Article

Life History of an Endangered Marine Insect Halovelia septentrionalis Esaki (Hemiptera: Veliidae)

School of Literature, The University of Morioka, 808 Sunakomi, Takizawa, Iwate 020-0605, Japan

Received 30 September 2015; Accepted 7 December 2015

Academic Editor: G. Wilson Fernandes

Copyright © 2015 Terumi Ikawa and Aika Nakazawa. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Halovelia septentrionalis Esaki is one of the endangered marine water striders found along the Japanese coast. It is of primary importance to investigate its life history in the field so as to develop conservation measures as well as to understand how this species has adapted to marine environments. We studied its life history in Misaki on the southern part of the Miura Peninsular near Tokyo, ca. 35°N, probably the northernmost locality not only for H. septentrionalis but also for any Halovelia species, most of which are found in warm tropical or subtropical waters. The southern part of the Miura Peninsular has jagged coastlines with deep inner bays. Adults and nymphs were found skating along the rocky shore of inner bays with overhanging vegetation nearby. This species appeared to have at least 2 generations a year and to overwinter in the adult stage. We discussed its overwintering strategy in comparison to those of two other Japanese marine water striders.