东山湾潮下带前鳃类软体动物的生态

Ecological study of Prosobranchia(Mollusca)in subtidal zone,Dongshan Bay,Fujian

本文研究了东山湾潮下带前鳃类软体动物的生态。结果表明,该湾有前鳃类软体动物31科59属86种。其中,分布到黄、渤海的有18种,分布到东海的有59种,只在南海分布的有26种。广温广布种占20.93%,暖水种55.81%,热带种仅5.81%。平均生物量和栖息密度分别为125.37g/m^2和16个/m^2,数量分布不均匀并有明显的季节变化。该湾主要有三个群落:棒锥螺-浅缝骨螺-红带织纹螺群落、假(?)拟塔螺-线缝骨螺-细肋蕾螺群落、细肋蕾螺-假(?)拟塔螺-双带光螺群落。前鳃类软体动物的种类组成、数量分布和群落结构与底质环境关系密切,生物量和栖息密度在粘土质粉砂和粉砂质粘土底质中较高。

The paper reports 86 species belonging to 31 families 59 genera of Prosobranchia(Mol-lusca)in subtidal zone,Dongshan Bay.Eurythermal-eurytopic species acount for 20.9%,warm-water species 55.81%,and tropical water species only 5.81% respectively in all.There were 18 species distributed in the Yellow Sea and Bohai Sea,there were 59 species dis-tributed in the East China Sea and South China Sea and 26 species distributed in the SouthChina Sea.The average biomass and density were 125.37g/m^2 and 16 ind./m^2 respectively.The biomass and density were uneven and with distinct seasonal variation.There were 3main communities of Prosobranchia:Turritella bacillum-Murex traps-Nassarius succinctacommunity;Turricula nelliae spurius-Murex trapa-Gemmula deshayesii community;Gemmu-la deshayesii-Turricula nelliae spurius-Melanella bivittata community.The relationship ofspecies compsition,distribution of number and community structure of the Prosobranchia tosedimentary enviroment were close.There were higher density and biomass in TY and YT ofsedimental types than other.