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Post by OldGreenGrolar on Dec 1, 2020 0:07:00 GMT -5
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Post by OldGreenGrolar on Dec 1, 2020 0:08:40 GMT -5
More: “This is the first report of the diving capabilities of polar bears based on data from biologging instruments. Most polar bears seldom dive beyond 3–4 m. However, they are clearly physically and behaviourally capable of diving to greater depths. One individual in the study stood out in this regard, by diving more regularly to greater depths. This individual might be a specialist in aquatic stalking, as she also dove when she was offshore in the drifting sea ice. Alongside swimming below ice floes during aquatic stalking, accessing coastal underwater resources such as cadavers or seaweed are likely reasons for the dives made by polar bears in this study. It is well documented that macroalgae is part of the polar bear diet. Lønø [1970] reported seeing a female polar bear and her yearling cub diving to a depth of 3–4 m in February to retrieve seaweed, which they consumed. The maximum dive depth reported in this study was 13.9 m. Within this depth range, breath-hold abilities are not likely to limit the depth of dives.” www.nature.com/articles/s41598-018-27947-4
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Post by OldGreenGrolar on Dec 1, 2020 0:10:54 GMT -5
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Post by brobear on Dec 1, 2020 4:53:37 GMT -5
Quote from reply #22: Polar bears and brown bears only separated from a common ancestor about 500,000 years ago, which in evolutionary terms is very recent. That they developed such super-powered lungs so quickly is surprising.
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Post by OldGreenGrolar on Dec 1, 2020 5:28:08 GMT -5
Quote from reply #22: Polar bears and brown bears only separated from a common ancestor about 500,000 years ago, which in evolutionary terms is very recent. That they developed such super-powered lungs so quickly is surprising. Polar bears overheat based on their well insulated fur coat and fat. Otherwise they have good stamina.
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