The British Herpetological Society

The Herpetological Journal is the Society's prestigious quarterly scientific journal. Articles are listed in Biological Abstracts, Current Awareness in Biological Sciences,Current Contents, Science Citation Index, and Zoological Record.

The 2017/18  impact factor of The Herpetological Journal is 1.268

ISSN 0268-0130


pdf 06.Diel activity patterns during autumn migration to hibernation and breeding sites in a Japanese explosive breeding frog Rana sakuraii

46 downloads

Open Access

pp. 173-180

Author: Tokio Miwa

Abstract: Relatively few studies have investigated diel activity patterns in amphibians; in particular, such studies focusing on autumn
migration are lacking. I investigated the diel activity patterns during autumn instream migrations (to hibernation and breeding
sites) of Rana sakuraii, an explosive breeding frog, at mountain headwaters in Japan. Successive censuses at 2-h intervals,
over a period of 24 h, were conducted 15 times during 4 years (2001, 2002, 2013 and 2014). The diel activity pattern was not
significantly different between the sexes. It was clearly bimodal nocturnal (almost like a crepuscular type), with the first peak
appearing at 1600–2400 h and the second peak appearing at 0400–0800 h. The diel activity was highly correlated with day
time, but not with water and air temperatures. However, it was controlled primarily by illumination rather than by the day
time, because relatively many frogs migrated even during the day when it was very dark due to overcast or rainy weather and
during the midnight time (0000–0400 h) when the environment was slightly illuminated by moonlight owing to clear weather.
In contrast, the diel activity pattern during the winter breeding migration was clearly unimodal, with the peak at 1600–2400 h,
probably because the ambient temperature during the second peak was too low, even though the illumination was suitable.
The results presented herein demonstrate that R. sakuraii requires an optimum ambient illumination; consequently, its diel
activity shows a bimodal nocturnal pattern.

Keywords: autumn migration, bimodal nocturnal, crepuscular, diel activity, instream migration, Rana sakuraii

Download Access:

The latest 8 issues can be downloaded when logged in with a Herpetological Journal subscription membership.

Individual articles can be purchased for download.

Older issues and occasional Open Access articles are available for public download

Submissions:

For further information and submission guidelines please see our Journal Instructions to Authors

pdfBHS Ethics Policy

IMPORTANT NOTE - JUNE 2020

Please note that as from Volume 31 Number 1 (January 2021) on, the Herpetological Journal will be available as an online publication only - the last print edition will be Volume 30 Number 4.   

Aligning with this change, it is now no longer possible to purchase a subscription that includes a print copy of the HJ.  All members who have existing HJ print subscriptions that remain active as at end June 2020 will receive the full four 2020 print editions.  New subscribers or renewals after this time will only have option to subscribe to the online only subscription package.  Subscription pricing has been amended to reflect the content changes.