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基于稳定同位素技术对2015年春季海州湾海洋牧场海域采集的中小型生物消费者,包括鱼类、虾类、蟹类、头足类、螺类和双壳类等与其潜在碳源样品进行分析,利用IsoSource模型计算该海域消费者碳源贡献率,并对2014年夏季生物学样品与2015年春季样品比较,分析食物网营养结构的季节性变化,根据稳定同位素测定结果绘制二维双标图,计算出6种营养结构的量化指标.结果表明:2015年春季海州湾海洋牧场海域消费者的δ~(13)C值范围为-18.9‰~-17.1‰,3种潜在碳源[浮游植物、悬浮颗粒有机物(POM)、沉积物(SOM)]的δ~(13)C值范围为-18.1‰~-23.4‰,根据模型计算得出浮游植物对消费者的平均碳源贡献最大,为80.8%,其余依次为SOM和POM,分别为10.8%和8.4%.2014年夏季生物样品与2015年春季样品的δ~(13)C值存在显著差异,而δ~(15)N值无显著性差异;6种量化指标表明群落营养结构存在季节性差异,2014年夏季的δ~(13)C比值范围(CR)、总面积(TA)、平均最邻近距离(NND)和平均最邻近距离标准差(SDNND)均大于2015年春季,δ~(15)N比值范围(NR)和平均离心距离(CD)无明显变化,夏季群落营养结构冗余度小于春季,且食源多样性水平高于春季,存在季节差异.
Based on stable isotope techniques, samples of small and medium-sized consumers, including fish, shrimps, crabs, cephalopods, snails and bivalves, collected from sea area of Haizhou Bay watershed in spring 2015 were analyzed for their potential carbon sources , Using the IsoSource model to calculate the carbon source contribution rate of the consumers in the sea area, comparing the seasonal changes of the nutrition structure of the food web with the biological samples of summer 2014 and the spring of 2015, drawing a two-dimensional double map according to the stable isotope determination results , The quantitative indexes of six nutritional structures were calculated.The results showed that the δ ~ (13) C values ranged from -18.9 ‰ to -17.1 ‰ for consumers in marine habitat of Haizhou Bay in the spring of 2015. Three potential carbon sources The δ ~ (13) C values ranged from -18.1 ‰ to -23.4 ‰ for POM and SOM, and the phytoplankton contributed the most to the average carbon source of consumers according to the model. And the others were followed by SOM and POM, which were respectively 10.8% and 8.4%. There was a significant difference between δ ~ (13) C values of summer 2014 and spring 2015 samples, while δ ~ (15) N Significant differences; 6 kinds of quantitative indicators show that there are seasonal differences in community nutrition structure, The δ ~ (13) C ratio (CR), the total area (TA), the average nearest neighbor distance (NND) and the average standard deviation of the nearest neighbor distance (SDNND) of summer 2014 were all larger than those of spring 2015, N ratio range and average CD distance had no significant change. The redundancy of nutrition structure in summer was less than that of spring, and the level of food diversity was higher than that in spring with seasonal differences.