Sun Ming, Wang Bin, Li Yu Long, Wang Ai Yong, Dong Jing, Ma Tian Yu, Ban Yan Li
Liaoning Ocean and Fisheries Science Research Institute/Liaoning Province Key Laboratory of Marine Biological Resources and Ecology,Dalian 116023, Liaoning, China.
College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, Liaoning, China.
Ying Yong Sheng Tai Xue Bao. 2016 Apr 22;27(4):1103-1108. doi: 10.13287/j.1001-9332.201604.007.
By using stable isotope techniques, we analyzed the carbon and nitrogen stable isotope ratios of Rhopilema esculentum Kishinouye and its potential feed materials in Liaodong Bay of Bohai Sea, aiming to identify potential food sources and trophic levels of R. esculentum . The results showed that the δC and δN values for R. esculentum ranged from -20.27‰ to -23.06‰ (ave raged at -21.33‰), and from 6.82‰ to 10.03‰ (averaged at 8.25‰), respectively. The main food sources for R. esculentum included suspended materials, phytoplankton, fish eggs, zooplankton (≤1000 μm), zooplankton (1000-1500 μm), zooplankton (>1500 μm), among which, zooplankton (≤1000 μm) was the most important food source and contributed 71%-88% of the total food sources, followed by zooplankton (>1500 μm) (6%-19%), zooplankton (1000-1500 μm) (0%-22%), suspended materials (0%-10%), phytoplankton(0%-8%) and fish eggs (0%-2%). A Pearson correlation test indicated that there was significant negative relationship between the diameter and δC value of R. esculentum (P<0.05), while no significant correlation was found between its diameter and δN value (P>0.05). The trophic level of R. esculentum ranged from 2.79 to 3.88 depending on diameter classes,with a mean valu of 3.28 These results indicated that R. esculentum plays a key role in controlling microzooplankton in the Liaodong Bay, which is significant for providing deeper understanding into the tropic structure of biological communities as well as into the material cycles and energy flow of entire ecosystem in the Liaodong Bay.
利用稳定同位素技术，我们分析了渤海辽东湾海蜇及其潜在食物来源的碳、氮稳定同位素比值，旨在确定海蜇的潜在食物来源和营养级。结果表明，海蜇的δC值范围为-20.27‰至-23.06‰（平均为-21.33‰），δN值范围为6.82‰至10.03‰（平均为8.25‰）。海蜇的主要食物来源包括悬浮物质、浮游植物、鱼卵、浮游动物（≤1000μm）、浮游动物（1000 - 1500μm）、浮游动物（>1500μm），其中浮游动物（≤1000μm）是最重要的食物来源，占总食物来源的71% - 88%，其次是浮游动物（>1500μm）（6% - 19%）、浮游动物（1000 - 1500μm）（0% - 22%）、悬浮物质（0% - 10%）、浮游植物（0% - 8%）和鱼卵（0% - 2%）。皮尔逊相关性检验表明，海蜇的直径与δC值之间存在显著负相关（P<0.05），而其直径与δN值之间未发现显著相关性（P>0.05）。根据直径类别，海蜇的营养级范围为2.79至3.88，平均值为3.28。这些结果表明，海蜇在辽东湾微浮游动物控制中起关键作用，这对于深入了解生物群落的营养结构以及辽东湾整个生态系统的物质循环和能量流动具有重要意义。
