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What's a Polar Bear Doing in the Tropics? - Animal Concerns ...

What's a Polar Bear Doing in the Tropics? - Animal Concerns ...

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CHAPTER 3WELFARE CONCERNS FOR POLAR BEARS IN ATROPICAL CLIMATE3.1 Detailed behavioural study: Effects of heat stress3.1.1 MethodsThe polar bears at S<strong>in</strong>gapore Zoo have no substrates <strong>in</strong> which to dig daybeds, have no snow to lie <strong>in</strong>, have no ice-cold water to plunge <strong>in</strong> and haveno control over <strong>the</strong>ir offered diet. Therefore, <strong>the</strong> only ways <strong>the</strong>y canattempt to cool down when outdoors is by pant<strong>in</strong>g, by adopt<strong>in</strong>g a posture <strong>in</strong>which some heat will be dissipated from <strong>the</strong>ir body (i.e. ly<strong>in</strong>g spread-eagledon <strong>the</strong> ground with thighs spread wide) and seek<strong>in</strong>g out whatever shade isavailable.This study documents <strong>the</strong> pant<strong>in</strong>g and ly<strong>in</strong>g flat behaviours. A prelim<strong>in</strong>arystudy was conducted <strong>in</strong> August 2005. The prelim<strong>in</strong>ary study provided anopportunity for <strong>the</strong> observers to familiarise <strong>the</strong>mselves with <strong>the</strong> behaviouralrepertoire of <strong>the</strong> animals, as well as ref<strong>in</strong><strong>in</strong>g <strong>the</strong> observation protocol.S<strong>in</strong>ce data on behavioural states ra<strong>the</strong>r than events were collected and <strong>the</strong>subjects were sampled us<strong>in</strong>g a few behavioural categories, <strong>the</strong> polar bearswere observed <strong>in</strong> <strong>the</strong>ir enclosures us<strong>in</strong>g <strong>in</strong>stantaneous and scan animalsampl<strong>in</strong>g. 45 Scans were made every two m<strong>in</strong>utes to determ<strong>in</strong>e which of <strong>the</strong>behaviour categories (def<strong>in</strong>ed <strong>in</strong> Table 3.1 and 3.2) each <strong>in</strong>dividual wasengaged <strong>in</strong>. The sampl<strong>in</strong>g <strong>in</strong>terval of two m<strong>in</strong>utes was chosen after <strong>the</strong>prelim<strong>in</strong>ary study, s<strong>in</strong>ce it gave <strong>the</strong> closest account of <strong>the</strong>ir behaviour.Ad libitum sampl<strong>in</strong>g was also used to record novel or <strong>in</strong>trigu<strong>in</strong>g behavioursand actions.Follow<strong>in</strong>g <strong>the</strong> prelim<strong>in</strong>ary study, observations were made from Septemberuntil December 2005 between <strong>the</strong> hours of approximately 1000 and 1730 fora total of seven days. Observations were made for 3,150 m<strong>in</strong>utes with atotal of 1,575 sample po<strong>in</strong>ts.What’s a polar bear do<strong>in</strong>g <strong>in</strong> <strong>the</strong> tropics?19www.acres.org.sg

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