应用稳定同位素技术研究江苏近海食物网营养结构的季节性变化

本研究基于稳定同位素技术对江苏近海春、夏、秋季采集的不同生物类群(鱼类、甲壳类、头足类和底栖动物等)进行稳定同位素的分析,利用SIBER模型计算不同季节消费者的营养生态位,并计算出6种营养结构的量化指标.结果表明,3个季节的δ13C值、δ15N值均差异不显著(p>0.05).春季δ13C值范围为?24.47‰～?14....

Seasonal variation in the trophic structure of food webs in coastal waters of Jiangsu Province based on stable isotope techniques

In this study, we used stable isotope technology to analyze different species (fish, crustaceans, cephalopods, benthos, etc.) collected in spring, summer and autumn in the coastal waters of Jiangsu Province. We used SIBER model to calculate the trophic niche of consumers, and calculated the quantitative indicators of six metrics in different seasons. The results showed that there were no significant differences in δ13C and nitrogen δ15N values among three seasons (p>0.05). In spring, the δ13C values ranged from ?24.47‰ to ?14.50‰, the δ15N values ranged from 6.86‰ to (14.98±0.49)‰, and the trophic level ranged from 1.52 to 4.28±0.17. In summer, the δ13C values ranged from ?19.86‰ to ?14.44‰, the δ15N values ranged from 5.79‰ to (12.54±3.50)‰, and the trophic level ranged from 1.25 to 3.52. In autumn, the δ13C values ranged from (?22.17±4.90)‰ to (?14.21±0.36)‰, the δ15N values ranged from 6.30‰ to (14.60±0.51)‰, and the trophic level ranged from 1.34 to 4.15±0.14. The structure of food web was stable in each season, and the trophic niche of some species overlaps in different degrees. In addition, the food sources are more extensive, and the trophic level and community diversity are higher in spring, the food sources of consumers are more abundant, but the degree of trophic niche differentiation is lower in summer, while in autumn, the structure of food web is relatively simple, but the distribution of trophic niche is wider.