Diving behavior of the Atlantic walrus in high Arctic Greenland and Canada
| Autor: | Signe Jung-Madsen, Susanne Ditlevsen, K. B. Zinglersen, Eva Garde, Mads Peter Heide-Jørgensen, R. G. Hansen |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
geography education.field_of_study geography.geographical_feature_category 010604 marine biology & hydrobiology Population Fjord Aquatic Science Biology 010603 evolutionary biology 01 natural sciences Predation Waves and shallow water Oceanography Arctic Benthic zone education Bay Ecology Evolution Behavior and Systematics Sound (geography) |
| Zdroj: | Journal of Experimental Marine Biology and Ecology. 500:89-99 |
| ISSN: | 0022-0981 |
| DOI: | 10.1016/j.jembe.2017.12.009 |
| Popis: | Investigations of diving behavior of the Atlantic walrus (Odobenus rosmarus rosmarus) in the high Arctic Greenland and Canada are important for understanding behavioral adaptations and area utilization of this Arctic benthic feeder. Furthermore, such information along with estimations of annual consumption and carrying capacity of walruses are needed in management decisions of this utilized species. Satellite-linked transmitters deployed on 27 walruses from 2010 to 2013 provided data for investigations of diving behavior in three predefined main areas: NW Greenland, Smith Sound and NE Canada. Sub-areas within each main area were also compared. Depth of dives, dive rates, time at depth of dives, haul-out periods and vertical speeds were estimated. Majority of dives targeted depths from 10 to 100m, which corresponds to the distribution of walrus preferred food items. Four dives to depths >500m occurred and are the deepest ever documented for a walrus. Dive rates and time at depth of dives were significantly different between sub-areas (p |
| Databáze: | OpenAIRE |
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