The Lipid Composition of Subcutaneous Adipose Tissue of Brown Bears (Ursus arctos) in Croatia

• Published in: Physiological and Biochemical Zoology
• Main Authors: Vranković, Lana, Delaš, Ivančica, Reljić, Slaven, Huber, Đuro, Maltar-Strmečki, Nadica, Klobučar, Karla, Krivić, Gabriela, Stojević, Zvonko, Aladrović, Jasna
• Format: Article in Journal/Newspaper
• Language: Croatian
• Published: University of Chicago Press 2017
• Subjects: Physics; Physical Chemistry; Public Health and Health Care; Veterinary Medicine; Ursus arctos
• Online Access: http://fulir.irb.hr/4392/; http://www.journals.uchicago.edu/doi/full/10.1086/690913; https://doi.org/10.1086/690913

The composition of adipose tissue in brown bears (Ursus arctos) is highly variable and depends on an individual’s feeding habits. Fatty acid composition of subcutaneous adipose tissue (SAT) may provide insight into brown bear feeding habits, for which data are scarce. The aim of this study was to determine the lipid composition of SAT and variations in the composition of fatty substances with regard to gender and to assess SAT relative to season and bodymass (BM)of brown bears in Croatia. Seventysix tissue samples of brown bear SAT were analyzed in this study. We found that gender, season, and BM significantly affected the lipid composition of SAT. Both females and males had higher percentages of saturated fatty acids and monounsaturated fatty acids (MUFAs) inSAT in springthan inautumn, while the percentage of polyunsaturated fatty acids (PUFAs) was higher in autumn. The prevalence of MUFAs in SAT and the greater presence of PUFAs in autumn, together with thepresence of odd- chain saturated fatty acids, indicate the importance of these fatty acids in brown bear physiology. We suggest that the lipid content of adipose tissue may provide valuable information on changes in brown bear condition in response to feeding habits and the effects of supplemental feeding.