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1 June 2011 Range Expansion and Food Habits of Rana nigromaculata Introduced to Hokkaido, Japan
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Abstract

A field survey was made in 2006 for the exotic black-spotted pond frogs Rana nigromaculata in central Hokkaido, northern Japan. The result suggested a prominent range expansion of this frog since the previous survey in 1997. Examinations of stomach contents from 140 frogs yielded 662 prey items that almost entirely consisted of invertebrate preys, such as lepidopteran larvae, water striders (Gerridae), and spiders (Araneae). The result suggests a fairly little impact, if any, of this accidentally introduced frog upon the native tree frog Hyla jponica through direct predation.

© 2011 by The Herpetological Society of Japan
Kotaro Takai "Range Expansion and Food Habits of Rana nigromaculata Introduced to Hokkaido, Japan," Current Herpetology 30(1), 75-78, (1 June 2011). https://doi.org/10.3105/018.030.0109
Accepted: 1 May 2011; Published: 1 June 2011
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