黄河三角洲潮间带大型底栖无脊椎动物群落结构与分布特征

为了解黄河三角洲潮间带大型底栖无脊椎动物现状,于2019年5月分别对建国后黄河入海口4个流路区域20个潮间带站位进行了采样调查.调查共采集到大型底栖无脊椎动物5纲16目37科60种,主要优势种有托氏（虫昌）螺(Umbonium costatum)、泥螺(Bullacta exarata)、光滑河篮蛤(Potamocor...

Community characteristics and spatial distribution of invertebrate macrobenthos in intertidal zone of the Yellow River Delta

In order to understand the community characteristics of invertebrate macrobenthos in intertidal zone of the Yellow River Delta, including the species composition, biomass, density and dominant species, an investigation was conducted at a total 20 sections of the four flow paths zone in May 2019. A total of 61 macrobenthos species belonging to 38 families and 15 orders in 5 classes were collected and identified. The dominant species were mollusks such as Umbonium costatum, Bullacta exarata, Potamocorbula laevis, Moerella iridescens, and Mactra veneriformis. The average density and average biomass were 158.34 ind./m2 and 398.3 g/m2, respectively. The Margalef richness index (d) value was from 0.786 to 1.409, with the Pielou index (J) value ranging from 0.332 to 0.462 and the Shannon-Wiener index (H") value from 1.216 to 1.692. The average density was significantly different among different locations, but no significant differences were found in other indexes. The results of cluster analysis indicated that there was high similarity of community characteristics of macrobenthos among flow path zones. The structural characteristics of macrobenthos community was affected by many factors, for instance, the change of flow paths to the sea, dam construction and Yellow River Delta nature reserves. Protection suggestion of invertebrate macrobenthos in intertidal zone of the Yellow River Delta was given in terms of the current characteristics of distribution.