Total Activity Rhythms of Three Soricine Species in Hokkaido
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Daily activity rhythms of three sympatric soricine shrews in Hokkaido were investigated. Nineteen Sorex unguiculatus, 13 S. caecutiens, and 11 S. gracillimus were captured, and their total activities were studied using an infrared sensor system under two different laboratory regimes (16L8D, 20℃ and 10L14D, 5-15℃). All the three shrew species were more active during periods of darkness than during light periods; however, during the light periods most of S. gracillimus and some of S. unguiculatus and S. caecutiens exhibited short intermittent activity. Activity during periods of darkness was polymodal for all the three species under the 10L14D, 5 -15℃ regime, but was bimodal in S. unguiculatus under the 16L8D, 20℃ regime. The actogram pattern of S. caecutiens proved to be intermediate between S. unguiculatus and S. gracillimus. Interspecific differences in activity pattern seem to be related to body size in the genus Sorex.
- Mammalogical Society of Japanの論文
Mammalogical Society of Japan | 論文
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