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Body size changes among otters, Lutra lutra, in Norway: the possible effects of food availability and global warming.

https://arctichealth.org/en/permalink/ahliterature81316
Source
Oecologia. 2006 Nov;150(1):155-60
Publication Type
Article
Date
Nov-2006
Author
Yom-Tov Yoram
Heggberget Thrine Moen
Wiig Oystein
Yom-Tov Shlomith
Author Affiliation
Department of Zoology, Tel Aviv University, Tel Aviv, 69978, Israel. yomtov@post.tau.ac.il
Source
Oecologia. 2006 Nov;150(1):155-60
Date
Nov-2006
Language
English
Publication Type
Article
Keywords
Animals
Body Size - physiology
Diet
Geography
Greenhouse Effect
Norway
Otters - physiology
Regression Analysis
Abstract
Using museum data of adult specimens whose sex, age, and locality are known, we studied temporal and geographical body size trends among the otter, Lutra lutra, in Norway. We found that body size of the otters increased during the last quarter of the twentieth century, and suggest that this trend is related to increased food availability from fish farming and possibly also to energy saving due to elevated sea temperatures. Birth year and death year explained 38.8 and 43.5%, respectively, of the variation in body size. Body size of otters was positively related to latitude, thus conforming to Bergmann's rule.
PubMed ID
16868759 View in PubMed
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Natural exposure of coastal river otters to mercury: relation to age, diet, and survival.

https://arctichealth.org/en/permalink/ahliterature4816
Source
Environ Toxicol Chem. 2001 Sep;20(9):1986-92
Publication Type
Article
Date
Sep-2001
Author
M. Ben-David
L K Duffy
G M Blundell
R T Bowyer
Author Affiliation
Institute of Arctic Biology, University of Alaska Fairbanks, 99775-7000, USA. bendavid@uwyo.edu
Source
Environ Toxicol Chem. 2001 Sep;20(9):1986-92
Date
Sep-2001
Language
English
Publication Type
Article
Keywords
Age Factors
Animals
Diet
Environmental Exposure
Female
Food chain
Male
Mercury - adverse effects - pharmacokinetics
Otters
Population Dynamics
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Survival Analysis
Tissue Distribution
Water Pollutants, Chemical - adverse effects
Abstract
We evaluated effects of location (i.e., Jackpot Bay, a naturally contaminated site, and Herring Bay, reference site), diet as determined by stable isotopes, and age on mercury concentrations in individual river otters (Lontra canadensis) from Prince William Sound, Alaska, USA. We also investigated the effects of mercury accumulation on survival of river otters from these two locations. Our results indicated that mercury concentrations in fishes from Jackpot Bay were significantly higher than those in fishes from Herring Bay and those in pelagic fishes. In addition, a predominant intertidal fish diet in both areas influenced the accumulation of mercury concentrations in otters. Concentrations of mercury in fur of river otters from Jackpot Bay were significantly higher than those of animals from Herring Bay. Nonetheless, we did not detect significant differences in survival between otters inhabiting the two areas, suggesting that this natural contamination was not high enough to impair survival. Our ability to investigate the effects of various factors such as location, diet composition, and age on mercury accumulation and subsequent survival of individuals offers an example for a link between individual-based captive studies and population-level field investigations.
PubMed ID
11521825 View in PubMed
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