Document Detail

Recent changes in body size of the Eurasian otter Lutra lutra in Sweden.
MedLine Citation:
PMID:  21090004     Owner:  NLM     Status:  MEDLINE    
We studied geographical and temporal body size trends among 169 adult museum specimens of the Eurasian otter (Lutra lutra) collected in Sweden between 1962 and 2008, whose sex, year of collection, and locality were known. Skull size and body mass increased significantly in relation to the year of collection, and skull size (but not body mass) was significantly and negatively related to latitude, contrasting Bergmann's rule and the trend found for Norwegian otters. Latitudinal differences in body size between the two countries may be due to differences in food availability. The temporal increase in body size among Swedish otters resembled that observed for Norway otters, though Swedish otters are smaller with respect to their Norwegian counterparts. Latitude and year represent a combination of environmental factors, including ambient temperature in the year of collection as well as the number of days of ice coverage. We replaced the above factors with mean annual temperature or the number of days of ice coverage, and found that each of these factors explains a similar proportion of the variation in body size as did latitude and year. We hypothesize that this temporal increase in body size is related to a combination of factors, including reduced energy expenditure resulting from increasing ambient temperature, and increased food availability from longer ice-free periods.
Yoram Yom-Tov; Anna Roos; Peter Mortensen; Øystein Wiig; Shlomith Yom-Tov; Thrine M Heggberget
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ambio     Volume:  39     ISSN:  0044-7447     ISO Abbreviation:  Ambio     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-22     Completed Date:  2010-12-14     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  0364220     Medline TA:  Ambio     Country:  Sweden    
Other Details:
Languages:  eng     Pagination:  496-503     Citation Subset:  IM    
Department of Zoology, Tel Aviv University, Israel.
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MeSH Terms
Body Size*
Global Warming*
Ice Cover*
Otters / growth & development*

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