摘要
通过检测以毛鳞鱼和大西洋鲱饲养6个月以上的幼年和成年豢养斑海豹(Phoca largha)肌肉、肝脏、肾脏、肺、毛发、触须和趾甲等组织的δ13C和δ15N值,获得各组织的分馏系数,结合辽东湾海域斑海豹肌肉、肝脏和肾脏等组织及辽东湾海域潜在食物的δ13 C和δ15N值,推测斑海豹在辽东湾海域的食物来源.结果发现:豢养斑海豹对食物中的613C值各组织分馏系数依次为触须(3.5‰)＞毛发(3.2‰)＞趾甲(3.0‰)＞肌肉(1.3‰)＞肺(1.0‰)＞肝脏(0.5‰)＞肾脏(0.3‰);对食物中的δ15N值各组织分馏系数依次为肾脏(2.8‰)＞肝脏(2.7‰)＞肌肉、趾甲和触须(均为2.6‰)＞肺(2.4‰)＞毛发(1.8‰);豢养斑海豹幼崽肌肉、肾脏和肝脏组织的δ13C值分别为-22.4‰、-23.0‰和-22.1‰,母兽乳汁的δ13 C值为-24.8‰;辽东湾海域成年斑海豹肌肉、肾脏和肝脏组织的δ13C值分别为-18.6‰、-19.1‰和-18.7‰.通过豢养斑海豹肌肉组织δ13C的分馏系数(1.3‰)推测辽东湾海域斑海豹的食物以鱼类为主,喜食中上层和中下层鱼类,同时也摄食一些头足类和虾类.
Abstract
This study measured δ13 C and δ15 N in muscle, liver, kidney, lung, hair, whisker and nail from juvenile and adult captive spotted seals Phoca largha after feeding Clupea harengus and Mallotus villosus for more than 6 months to produce the fractionation in each tissue.Meanwhile, this study estimated the food sources for the wild spotted seals from Liaodong Bay, in terms of δ13C and δ15N fractionations in muscle, liver and kidney of wild spotted seals and its potential foods in Liaodong Bay.The results showed that the highest δ13C value in captive spotted seals was in whisker (3.5‰), followed by hair (3.2‰), nail (3.0‰), muscle (1.3‰o), lung (1.0‰o), liver (0.5‰) and kidney (0.3‰).The highest δ15N value in captive spotted seals was in kidney (2.8‰o), followed by liver (2.70.3‰), muscle (2.60.3‰), nail (2.60.3‰), whisker (2.6‰), lung (2.4‰) and hair (1.80.3‰).The δ13C values in captive pup were-22.4‰,-23.0‰ and-22.1‰ in muscle, kidney and liver, respectively.The δ13C value in milk was -24.8‰.The δ13C values in wild adult spotted seals from Liaodong Bay were-18.6‰,-19.1‰ and-18.7‰ in muscle, kidney and liver, respectively.According to the fractionation (1.3‰) of δ13C in captive spotted seal muscle, the estimated food sources for wild spotted seals from Liaodong Bay were mainly from fishes (especially pelagic and meso-demersal fishes), and some cephalopoda and shrimps as well.
国家科技期刊平台
NSTL
维普
万方数据