南长山岛岩岸潮间带底栖藻类群落结构的季节变化格局

南长山岛岩岸潮间带底栖藻类群落的种类组成存在显著的季节差异,4个季节的群落共有种为8种:孔石莼、海黍子、石花菜、江蓠、叉枝藻、小石花菜、叉枝伊谷草和瘤枝凹顶藻。4个季节群落中生物量的变化为:秋季>夏季>冬季>春季。绿藻和褐藻类群主要为暖温性种类,而红藻类群比较复杂,既有暖温带、温带和亚热带性种类,也有寒温带的冷水性种类。4个季节群落的物种优势度序列存在明显的差异,海黍子在春季、夏季和冬季3个群落为第一优势种,瘤枝凹顶藻在秋季为第一优势种。不同季节群落多样性指数变化如下:物种丰富度指数,春季>秋季>冬季>夏季;物种多样性指数,冬季=秋季>春季>夏季;均匀度指数,冬季=秋季>春季>夏季。群落的多样性由红藻类群控制。

Seasonal Variation Pattern of Benthic Algal Community Structure in Rocky Intertidal Zone of the Nanchangshan Island

There are signficant seasone variations in species composition of benthic algal communities in the rocky intertidal zone of Nanchangshan Island, and the common species in 4 seasonal communites are Ulva pertusea, Sargassum kjellmanianum, Gelidium amansic, Gracilaria verrucosa, Gracilaria divaricatum, Gymnogongrus flabelliformis, Ahnfeltia furcellata and Laurencia glandulifera. The seasonal communities arrange in order of magnitade of total algal biomass to be antumn community, summer community, winter community and spring community. The green and brown algae species are mainly warm-temperate species, but the red algae species include warm-temperate, temperate, subtropical and cold-temperate species. The dominant species for different seasonal communities are different, Sargassum Kjellmanianum is the first dominant species for spring, summer and winter communities, and Laurencia glandulifera is the first dominant species for autumn community. The diversity indexes for different seasons are as follows: the species abundances for different seasons arrange in order of magnitude to be spring, autumn, winter and summer; the species diversity indexes for different seasons arrange in order of magnitude to be winter and autumn, spring and summer; the homogeneity indexes for different seasons arrange in order of magnitude to be winter and autumn, spring and summer; and the community diverisity is controlled by red algae species.