论文部分内容阅读
利用稳定同位素技术分析了东海银鲳(Pampus argenteus)及其可能摄食饵料的碳、氮稳定同位素比值,以期探讨东海银鲳可能的食物来源。结果表明:东海区银鲳平均碳(δ13C)和氮(δ15N)稳定同位素比值分别为-18.22‰、8.16‰,其可能摄食饵料的δ13C值变化范围为-17.33‰~-21.58‰,差值为4.25‰,δ15N值变化范围为3.89‰~7.96‰,差值为4.07‰;东海银鲳可能的食物来源主要为箭虫、虾类、水母类、头足类、仔稚鱼和浮游动物等,其中箭虫为主要可能的食物来源,其贡献率为24%~78%,平均贡献率为57%;银鲳可能摄食的其他饵料中,贡献率从大到小依次为虾类、水母类、头足类、仔稚鱼、>1000μm浮游动物、500~1000μm浮游动物和100~500μm浮游动物,其平均贡献率分别为11.8%、8.4%、7.1%、5.0%、4.9%、3.2%和2.6%。由以上结果可知,银鲳是一种广食性鱼类,其饵料种类较多,碳和氮的来源均较为复杂。
Stable isotope analysis of the carbon and nitrogen stable isotope ratios of the Pampus argenteus and its possible bait in the East China Sea was conducted to investigate possible sources of food in the East China Sea. The results showed that the stable isotope ratios of δ13C and δ15N in the East China Sea were -18.22 ‰ and 8.16 ‰, respectively. The δ13C value of the bait in the East China Sea ranged from -17.33 ‰ to -21.58 ‰, with a difference of 4.25 ‰, δ15N values ranged from 3.89 ‰ to 7.96 ‰, with a difference of 4.07 ‰. The possible food sources of silver 鲳 in the East China Sea were mainly arrowhead worms, shrimp, jellyfish, cephalopods, larvae and zooplankton, Among them, Arrowworm is the main possible food source, with the contribution rate of 24% -78% and the average contribution rate of 57%. Among the other feedstuffs that silver 鲳 may feed, the contribution rates are shrimp, jellyfish, Cephalopods, larvae,> 1000μm zooplankton, 500 ~ 1000μm zooplankton and 100 ~ 500μm zooplankton, the average contribution rates were 11.8%, 8.4%, 7.1%, 5.0%, 4.9%, 3.2% and 2.6 %. It can be seen from the above results that silver pomfret is a kind of polyphagous fish with more kinds of food and more complicated sources of carbon and nitrogen.