三亚临春河红树林生态系统中鱼类营养级的分析

为了解该三亚市临春河红树林生态系统中鱼类营养级的状况，本研究采用稳定同位素技术系统水体中的鱼类进行了分析。结果发现5种鱼类：沙鲮鱼（Sillago.sp）、多鳞鳝鱼（Sillagosihama）、黑边石斑鱼（Epinephelus fasciatus）、天竺鲷鱼（Apogon.sp）、赤点石斑鱼（Genus Epinephelus.sp），组织的氮同位素值分别为5.82‰、11.60‰、12.62‰、17.72‰、和12.76‰，对应的营养级分别为1.77、3.47、3.77、3.80和3.81。结论，三亚河沿岸红树林生态系统中，主要存在2个营养级。其中，沙鲮鱼处于相对较低的营养级，属于初级消费者。多鳞鳝鱼、黑边石斑鱼、天竺鲷鱼、赤点石斑鱼位同一营养级，属于次级级消费者。

Analysis of fish trophic level in mangrove ecosystem of Linchun River in Sanya

Stable nitrogen isotopes of fish tissue in mangrove ecosystem were measured for the assessment of fish trophic level in mangrove ecosystem of Linchun River from October in 2013 to April in 2014 in Sanya. There were 5 species of fishes in the mangrove ecosystem,including Sillago.sp,Sillagosihama, Epinephelus fasciatus, Apogon.sp and Genus Epinephelus.sp. Values of nitrogen isotope in tissue of Sillago.sp,Sillagosihama, Epinephelus fasciatus, Apogon.sp and Genus Epinephelus.sp were 5.82‰, 11.60‰,12.62‰,17.72‰ and 12.76‰,and the corresponding trophic level of them was 1.77, 3.47, 3.77, 3.80 and 3.81, respectively. These results suggested that Sillago.sp were primary consumers and were in low trophic level, while other 4 fish species were in same high trophic level and were secondary consumers in mangrove ecosystem of Linchun River in Sanya.