Fatty acids and stable isotopes as indicators of early-life feeding and potential maternal resource dependency in the bull shark Carcharhinus leucas

被引:35
作者
Belicka, Laura L. [1 ,2 ,4 ]
Matich, Philip [3 ,4 ]
Jaffe, Rudolf [1 ,2 ,4 ]
Heithaus, Michael R. [3 ,4 ]
机构
[1] Florida Int Univ, SE Environm Res Ctr, Miami, FL 33199 USA
[2] Florida Int Univ, Dept Chem & Biochem, Miami, FL 33199 USA
[3] Florida Int Univ, Dept Biol Sci, Miami, FL 33199 USA
[4] Florida Int Univ, Marine Sci Program, N Miami, FL 33181 USA
基金
美国国家科学基金会;
关键词
Essential fatty acid deficiency; Fatty acids; Food webs; Maternal investment; Stable isotopes; Sharks; ELASMOBRANCH FISHES; MASS-SPECTROMETRY; SPHYRNA-LEWINI; NORTHERN GULF; METABOLISM; GROWTH; CARBON; LIPIDS; DEFICIENCY; NITROGEN;
D O I
10.3354/meps09674
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The degree of reliance of newborn sharks on energy reserves from maternal resource allocation and the timescales over which these animals develop foraging skills are critical factors towards understanding the ecological role of top predators in marine ecosystems. We used muscle tissue stable carbon isotopic composition and fatty acid analysis of bull sharks Carcharhinus leucas to investigate early-life feeding ecology in conjunction with maternal resource dependency. Values of delta C-13 of some young-of-the-year sharks were highly enriched, reflecting inputs from the marine-based diet and foraging locations of their mothers. This group of sharks also contained high levels of the 20:3 omega 9 fatty acid, which accumulates during periods of essential fatty acid deficiency, suggesting inadequate or undeveloped foraging skills and possible reliance on maternal provisioning. A loss of maternal signal in delta C-13 values occurred at a length of approximately 100 cm, with muscle tissue delta C-13 values reflecting a transition from more freshwater/estuarine-based diets to marine-based diets with increasing length. Similarly, fatty acids from sharks >100 cm indicated no signs of essential fatty acid deficiency, implying adequate foraging. By combining stable carbon isotopes and fatty acids, our results provided important constraints on the timing of the loss of maternal isotopic signal and the development of foraging skills in relation to shark size and imply that molecular markers such as fatty acids are useful for the determination of maternal resource dependency.
引用
收藏
页码:245 / 256
页数:12
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