中街山列岛岩相潮间带大型底栖动物的群落格局

于2006年9月和2007年7月在中街山列岛4个有居民海岛岩相潮间带设立8个断面,对大型底栖动物的群落结构进行了调查.共获得大型底栖动物34种,其中腔肠动物1种,环节动物3种,甲壳动物10种,软体动物20种.优势种有日本笠藤壶(Tetraclita japonica)、紫贻贝(Mytilus edulis)和节蝾螺(Turb articulatus)等4种.以季节和站位为因子对多样性指数进行双因素方差分析,结果表明只有夏、秋季丰富度指数(P=0.028)存在显著差异,其他指数的方差分析没有显著差异(P＞0.05).3个潮带4个岛屿共12个站位的聚类分析和MDS标序分析表明,12个群落可分为3组(Ⅰ、Ⅱ和Ⅲ组).大型底栖动物ABC曲线分析表明底栖动物群落尚未受到干扰.

Macrobenthos community patterns in the rocky intertidal zone of Zhongjieshan archipelago

The macrobenthic community was analyzed after collecting the macrobenthic fauna from 8 intertidal stations in Zhongjieshan archipelago (Miaozhihu, Qingbang, Huangxing and Dongfu) during Sept., 2006 and July, 2007. Thirty-four species were found in the stations, including 1 species of Coelenterata, 3 species of Annelida, 10 species of Crustacean and 20 species of Mollusca. The results of the relative important value analysis indicated that 4 species, such as Tetraclita japonica, Mytilus edulis and Turb articulatus and so on were dominant species. The results of two-way ANOVA about diversity index of the rock intertidal macrobenthic fauna in Zhongjieshan archipelago showed that the diversity index was not significantly different among stations and seasons, but species richness index (D) differed between spring and autumn. The results of Cluster and MDS analysis of 12 stations from 3 tidal zones and 4 islands indicated that the rocky intertidal macrobenthic community constituted three groups (namely, group Ⅰ, Ⅱ and Ⅲ). The ABC curves indicated that the macrobenthic fauna in the rocky intertidal zone was not disturbed in Zhongjieshan archipelago.