枸杞岛贻贝养殖筏架附着海藻的群落结构

为了解贝类筏式养殖区的大型海藻种类组成和分布格局及季节变动等群落水平的特征,实验于2018年春季(5月)、夏季(8月)、秋季(11月)和2019年冬季(2月)对枸杞岛贻贝养殖筏架上的附着海藻进行采样和分析.结果 显示,全年共采集到49种附着海藻,隶属11目20科33属.在物种数季节变化上,秋季最高(29种),春季最低(...

Community structure of epiphytic macroalgae on mussel culture rafts in Gouqi Island

Macroalgae that grow naturally on the artificial rafts of shellfish culture, have attracted much attention due to their high coverage, high biodiversity, and large biomass, as well as the following ecological side effects of the formation of amphipods such as gammaridea and caprellidae, and the microbial on the leaves communities. In order to understand the characteristics of the species composition, distribution pattern and seasonal variation of macroalgae in the shellfish raft culture area, the epiphytic macroalgae on the mussel rafts in Gouqi Island in summer (August), autumn (November) and winter (February) of 2018, and spring (May) of 2019 were sampled and analyzed. The results showed that 49 species of epiphytic macroalgae belonged to 11 orders, 20 families, 33 genera. In terms of seasonal variation, the number of species is the highest in autumn (29 species), the lowest in spring (20 species), with an average of 23 species; the seasonal variation of average biomass is highest in summer (5529.40 g/m2), and the lowest in autumn (2340.45 g/m2), The annual average value is 3345.06 ± 1480.40 g/m2; the horizontal distribution of species number and biomass are gradually decreasing from the inside to outside of the culture zones; the highest index of epiphytic macroalgae diversity (H '') is autumn (2.30), The lowest is summer (1.87), the annual average is 2.07 ± 0.18; there were 13 dominant species in the epiphytic macroalgae community, the highest in autumn (8 species) and the lowest in summer (5 species), with an average of 6 specie, the dominant species that appeared throughout the year were Jania adhaerens and Hypnea boergesenii; among the dominant epiphytic macroalgae, the maximum and minimum niche breadth occurred in autumn, they were Hypnea boergesenii (2.214) and Sargassum horneri (0.739); the maximum and minimum values of niche overlap occurred in autumn, they were Sargassum horneri - Gracilaria textorii (0.861) and Grateloupia turuturu - Sargassum horneri (0). The present study has shown that the existence of large-scale raft culture can prolong the growth period of red algae such as Grateloupia livida and Hypnea boergesenii, and increase the habitat range of brown algae such as Sargassum horneri, thus changing the community structure of macroalgae in the culture area, which is conducive to maintaining a higher level of annual primary productivity and the production of macroalgae debris in the sea area, and provides new ideas and important scientific basis for the construction of seaweed beds in the process of marine ranch construction.