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dc.contributor.authorMORI, Akiraja
dc.contributor.authorTODA, Mamoruja
dc.contributor.alternative森, 哲ja
dc.date.accessioned2015-04-15T02:05:16Z-
dc.date.available2015-04-15T02:05:16Z-
dc.date.issued2011-07-
dc.identifier.issn1345-5834ja
dc.identifier.urihttp://hdl.handle.net/2433/197271-
dc.description.abstractOvophis okinavensis is an endemic pitviper of the subtropical region of Japan. Based on information from various localities, the species has been considered a dietary generalist that exploits various terrestrial vertebrates. We analyzed stomach contents of O. okinavensis in a northern mountain area on Okinawa Island, based on data of a 10-years-study, to examine its trophic features at the population level. We recovered a total of 461 prey items, which were comprised of six, three, five, and three species of frogs, reptiles, birds, and mammals, respectively. Approximately 93% of dietary items consisted of frogs, the majority of which belonged to two explosively breeding species aggregating to restricted spots along the stream only during their reproductive season (winter). On the other hand, from April to November, the snake mainly depended on vertebrates other than frogs. Neither an ontogenetic dietary shift nor intersexual dietary divergence was evident although males tended to exploit one of the two explosively breeding frog species more frequently than females. There were weak positive correlations between snake size and prey size, but large snakes did not drop small prey items from their diet. Average body mass of each prey item was only 5.2% of snake body mass. Characteristics of trophic features of O. okinavensis of this population, such as extremely high dependency on frogs in winter, the absence of ontogenetic dietary shift, and utilization of small sized prey, are discussed in comparison with other viperids.ja
dc.format.mimetypeapplication/pdfja
dc.language.isoengja
dc.publisherHerpetological Society of Japanja
dc.rights© 2011 The Herpetological Society of Japanja
dc.subjectCrotalinaeja
dc.subjectPrey sizeja
dc.subjectOntogenetic dietary shiftja
dc.subjectOvophis okinavensisja
dc.subjectSexual differenceja
dc.titleFeeding Characteristics of a Japanese Pitviper, Ovophis okinavensis, on Okinawa Island: Seasonally Biased but Ontogenetically Stable Exploitation on Small Frogsja
dc.type.niitypeJournal Articleja
dc.identifier.ncidAA12410796ja
dc.identifier.jtitleCurrent Herpetologyja
dc.identifier.volume30ja
dc.identifier.issue1ja
dc.identifier.spage41ja
dc.identifier.epage52ja
dc.relation.doi10.5358/hsj.30.41ja
dc.textversionpublisherja
dc.relation.urlhttp://dx.doi.org/10.3105/018.030.0104-
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