舟山朱家尖岛潮间带软体动物生态初步调查

MOLLUSCA ECOLOGY STUDIES ON THEINTERTIDAL ZONE OF ZHUJIAJIAN I.,ZHOUSHAN ISLANDS

本文共报道软体动物88种,隶属5纲49科。潮间带软体动物按栖息底质分为三个类型:1.岩礁相:高潮带生物组成为粒屋顶螺群落和短滨螺—粒屋顶螺群落;中潮带为单齿螺—条纹隔贻贝群落、疣荔枝螺—青蚶—单齿螺群落和锈凹螺—疣荔枝螺群落;低潮带为锈凹螺—复瓦小蛇螺群落。2.泥相为珠带拟蟹守螺—婆罗囊螺群落。3.砂相:高潮带与中潮带上层未发现有软体动物分布,中、低潮带的较高潮区为紫藤斧蛤群落,较低潮区为等边浅蛤群落。 潮间带贝类生物量的季节变化规律如下:岩礁相依春、冬、秋、夏递减,泥相依夏、秋、冬、春递减,砂相依冬、秋、夏、春递减。 此外,本文还与中国沿海生物调查作了比较,其生物量与栖息密度的变化规律极为相似。

Zhujiajian Island is situated on the northern part of Zhejiang coast, 29° 57' 30' N to 29° 49' 30' N, 122° 19' 38' E to 122° 25' 40' t. From Feb. 1986 to Jan. 1987, ecological investigations in the intertidal zone were made by Zhejiang Fisheries College. In this paper, 88 species of Moliusca are reported , belong to 5 classes, 49 families. The vertical distribution of the intertidal Moliusca should be classified into following three types. 1. Rocky coast Two communities were found at the high-zone: (1) Tectarium granularis community and (2) Littorina brevicula- Tectarium granularis community. Three communities at mid-zone: (1) Monodonta labio-Septifer virgatus community, (2) Thais clavigera-Barvatia virescens-Monodonta labio community, and (3) Chlorostoma rusticum- Thais clavigera community. The low- zone has only one community: the Chlorostoma rusticum-Serpulorvis imbricata community. 2. Mud land One community was found at mid-zone and low-zone: the Cerithidea cingulata-Retusa boreensis community. 3. Sand beach Donax semigranosus community was found at the higher zone and Gomphina vereriformis community at the lower zone. Both high- zone and upper of mid- zone have no Mollusca. The sequence of the seasonal biomass of organisms is as follows: from upper to lower, the rocky coast is from spring (293.03 g/m2), winter (210.74 g/m2), autumn (190.11 g/m2) to summer (89.53 g/m2) . The mud land is from summer (9.67 g/m2), autumn (8.37 g/m2), winter (7.04 g/m2) to spring (6.56 g/m2) . The sand beach is from winter (57.60 g/m2), autumn (38.53 g/m2), summer (37.76 g/m2) to spring (24.5 g/m2) . In addition, this paper is compared with other theses concerning biological research in the intertidal zone of China sea coast, and regular pattern of change in both biomass and density is similar.