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Recent changes in body size of the Eurasian otter Lutra lutra in Sweden.

https://arctichealth.org/en/permalink/ahliterature100035
Source
Ambio. 2010 Nov;39(7):496-503
Publication Type
Article
Date
Nov-2010
Author
Yoram Yom-Tov
Anna Roos
Peter Mortensen
Ã?ystein Wiig
Shlomith Yom-Tov
Thrine M Heggberget
Author Affiliation
Department of Zoology, Tel Aviv University, Israel. yomtov@post.tau.ac.il
Source
Ambio. 2010 Nov;39(7):496-503
Date
Nov-2010
Language
English
Publication Type
Article
Keywords
Animals
Body Size
Female
Global warming
Ice Cover
Male
Otters - growth & development
Sweden
Abstract
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.
PubMed ID
21090004 View in PubMed
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