We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
DARKNESS, TWILIGHT, AND DAYLIGHT FORAGING SUCCESS OF BEARS (URSUS AMERICANUS) ON SALMON IN COASTAL BRITISH COLUMBIA.
- Authors
KLINKA, D. R.; REIMCHEN, T. E.
- Abstract
We examine foraging behavior of coastal black bears (Ursus americanus kermodei) during different light regimes on a salmon stream in British Columbia, Canada (2000-2002). Bears (maximum 7 simultaneously) were primarily active during daylight near the onset of the salmon spawning run and shifted to twilight and darkness as the spawning run progressed. Overall time budget included search and pursuit (58%), handling and ingestion (38%), and agonistic interactions with other bears (4%). Scavenging was greatest during daylight (19%) and lowest during darkness (3%). Bears were most efficient at capturing live salmon when standing (35.4% success) followed by running (20.5%) and walking (15.2%). Highest capture efficiency occurred during twilight (33.6%) compared with daylight (26.5%) and darkness (24.7%). Capture rate ranged from 1 to 3 salmon per hour per bear. Our results suggest that bears increased their total salmon intake by alternate use of visual and auditory cues during daylight and darkness.
- Subjects
BRITISH Columbia; BLACK bear; FORAGING behavior; KERMODE bear; SALMON; SPAWNING
- Publication
Journal of Mammalogy, 2009, Vol 90, Issue 1, p144
- ISSN
0022-2372
- Publication type
Article
- DOI
10.1644/07-MAMM-A-200.1