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The feasibility of assessing the diets of minke whale (Balaenoptera acutorostrata) in the East Sea through fatty acid composition in blubber and stable isotopic ratio of skin

Title
The feasibility of assessing the diets of minke whale (Balaenoptera acutorostrata) in the East Sea through fatty acid composition in blubber and stable isotopic ratio of skin
Author
신경훈
Keywords
minke whale; feeding ecology; fatty acids; stable isotopes; East Sea; KOREAN COASTAL WATERS; PRINCE-WILLIAM-SOUND; FOOD-WEB; TROPHIC RELATIONSHIPS; ADIPOSE-TISSUE; MARINE ECOSYSTEMS; COMMON DOLPHINS; CARBON ISOTOPES; EAST SEA; STRATIFICATION
Issue Date
2016-08
Publisher
KOREA OCEAN RESEARCH DEVELOPMENT INST
Citation
OCEAN SCIENCE JOURNAL, v. 51, No. 3, Page. 397-410
Abstract
To track the diet of minke whale (Balaenoptera acutorostrata) in the East Sea (Japan Sea), a conjoint analysis of fatty acids and C and N stable isotopes was performed on blubber and skin from the whale and its potential prey. The total lipid content in the blubber of minke whales ranged from 37.9% to 82.7% of wet mass (mean +/- SD, 63.1 +/- 17.2%), with triacylglycerols being the dominant lipids (96.9%-99.2% of total lipids). The lipid and fatty acid (FA) contents were systematically stratified throughout the depth of the blubber layers; contents of the dominant monounsaturated FAs (MUFAs), including 18:1 omega 9 and 16:1 omega 7, increased from the innermost layer to the outermost layer, whereas contents of saturated FAs (SFAs) and polyunsaturated FAs (PUFAs) were higher in the innermost layer than in the outermost layer. This stratification is related to the different physiological roles of the blubber layers; e.g., thermoregulation, streaming, and buoyancy. A comparison of the FA compositions of the innermost layer of minke whales with those of potential prey indicates that FA compositions in the whales are similar to those of Pacific herring. In addition, stable isotope ratios (delta C-13 and delta N-15) suggest that minke whale and Pacific herring have the same or similar diets. Therefore, the diets of minke whale from the East Sea (Japan Sea) could be inferred from information on the diet of the Pacific herring, although FA compositions and stable isotope ratios for Pacific herring would not exactly reflect the whale's diet. Although the very limited number of samples was used in this study, our preliminary findings are very promising to help understand the feeding ecology of minke whales in the East Sea (Japan Sea).
URI
https://link.springer.com/article/10.1007/s12601-016-0036-6http://hdl.handle.net/20.500.11754/68020
ISSN
1738-5261; 2005-7172
DOI
10.1007/s12601-016-0036-6
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > MARINE SCIENCE AND CONVERGENCE ENGINEERING(해양융합공학과) > Articles
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