【摘要】 通过对 1 993年 8月和 1 994年 2和 5月在崂山湾潮间带采集的底栖生物碳稳定同位素组成 (δ13C值 )的分析 ,发现该区底栖动物的主要食物来源以δ13C值大致可划分为 4类 :水体中的颗粒有机质 (POM )、底栖硅藻、大型底栖藻类和底泥中的有机物质 (SOM ) .研究结果表明 ,底栖动物的碳稳定同位素组成与其所摄食的食物的碳稳定同位素组成有密切的关系 ,因此 ,底栖动物的碳稳定同位素组成可以用于研究其食物来源 .碳稳定同位素数据证实 ,双壳类等滤食性动物的食物来源主要是POM ;甲壳动物的δ13C值的范围较大 ,证明其食物来源的多样性 ;底栖硅藻是多数腹足类食物来源的相当重要组成部分 .用碳稳定同位素示踪剂对该区底栖 -水体耦合作用的初步研究表明 ,水体中的POM是底栖动物的重要食物来源 ,但底泥中有机质和底栖硅藻也是许多底栖动物食物来源的相当重要的组成部分 .更多还原

【Abstract】 By analyses of stable carbon isotopic composition ( δ 13 C values) of the benthos collected in the Laoshan Bay in August 1993 and February and May 1994, it is found that the main food sources of the benthos can be divided into four groups in terms of stable carbon isotopic composition: POM, benthic diatoms, benthic macroalgae and the organic matter in sediments. The results show that the stable carbon isotopic compositions of the benthic animals has a close relation with that of the food they take in. The stable carbon isotopic compositions of benthos may be useful in elucidating their food sources. The carbon isotopic data confirm that POM is the main food source of the benthic filter feeders such as bivalves; crustaceans have a wide range of δ 13 C values, showing that their food source has diversity; benthic diatoms are an important fraction of the food for most of gastropods. A preliminary investigation of the benthic-pelagic coupling in the Laoshan Bay using the stable carbon isotopic tracers confirms the importance of POM as a food source for benthos in this region, but the organic matter in sediments and benthic diatoms are also relative important for a lot of benthic animals.更多还原