红树植物桐花树上污损动物群落研究

Marine Fouling Fauna Attaching to the Mangrove Plant Aegiceras corniculatum

1999年 10月调查广西英罗港红树林向海林带不同树龄桐花树 (Aegicerascorniculatum )茎上污损动物群落。结果表明 :(1)英罗港向海林带桐花树茎上有污损动物 9种 ,其中白条地藤壶 (Euraphia withersi)、潮间藤壶(Balanuslittoralis)、黑荞麦蛤 (Xenostrobusatratus)和团聚牡蛎 (Ostrea glomerata)为主要种。(2 )污损动物在茎上的附着高度 (h)随树龄和树高 (H )增大而增大 ,在最大树龄 17龄植株上平均达 182 cm。 h/ H以 5龄树最大 ,达91.9%。 (3)不同树龄植株上的污损动物种群和动物总量的密度均以 4龄树最大。潮间藤壶在 1龄和 2龄树上为密度的优势种 ,白条地藤壶在 3龄后占优势。动物总生物量以 2龄树最大。除 13龄树外 ,生物量均以潮间藤壶最大。(4 )不同树层的污损动物个体密度分布表现为先随树层增高逐渐升高 ,达到最大密度后又下降的过程。整层密度以 10 0 cm～ 12 0 cm层为最大。除 0 cm～ 2 0 cm层外 ,其余树层上各种群密度大小均表现为 :白条地藤壶 >潮间藤壶 >黑荞麦蛤 >团聚牡蛎。不同树层的污损动物生物量以 2 0 cm～ 40 cm最大 ,其后则随树高增大而递减 ,潮间藤壶是低树层的生物量优势种 ,白条地藤壶则是高树层的优势种。

The investigation on the marine fouling fauna community attaching to the stems of different aged Aegiceras corniculatum trees in the seaward forest zone of Yingluo Bay mangrove area in Guangxi was carried out in October 1999. There were 9 species in the fouling fauna community. Euraphia withersi, Balanus littoralis, Xenostrobus atratus and Ostrea glomerata were the major species. The attachment height (h) increased with the tree ages and the tree height (H). The attachment height of 17 year old trees (the oldest ones) reached 182 cm.The h/H ratio of 5 year old tree has the biggest value 91 9%. The individual density of 4 year old trees was the biggest in both different populations of the community and the total among the different aged trees. B. littoralis was the dominant species in individual density on 1 and 2 year old trees, and so was E. withers on the 3 year old and above trees. The biomass of the fouling community on the 2 year old trees was the biggest among different aged trees. And the biomass of B. littoralis on the different aged trees was the biggest in all populations except on the 13 year old. As to the different tree layers, the individual densities increased with the tree height firstly and then decreased after the biggest individual density. The individual density of the 100 cm to 120 cm tree layer was the biggest in all layers. Except for the 0 cm to 20 cm tree layer, the order in the individual density of different populations on the other tree layers was E. withers>B.littoralis>X. atratus>O. glomerata. The biomass of the community on the 20 cm to 40 cm tree layer was the biggest in different tree layers. And the biomass on the others above this layer decreased with the tree height. B. littoralis was the dominant specie in the biomass on the lower tree layers, and so was E.withers on the higher.