山东半岛漂浮铜藻和底栖铜藻气囊及生殖托的形态学比较分析

Morphological comparison and analysis of the vesicle and receptacle of floating and attached Sargassum horneri in Shandong peninsula

铜藻(Sargassum horneri)是主要分布于北太平洋西部的暖温带性海藻,是我国海藻场的重要组成物种之一,对于海洋环境、渔业资源具有重要支撑作用。除底栖生活外,铜藻可营漂浮生活。气囊和生殖托是铜藻适应漂浮生活的重要结构,但是二者与漂浮生活相适应的结构特点尚研究有限。本文对漂浮铜藻和底栖铜藻气囊、生殖托的数量以及主要形态学特征进行了统计学分析,结果显示:漂浮铜藻气囊体积显著小于底栖铜藻(P<0.01),漂浮铜藻生殖托个数远少于底栖铜藻(P<0.01),推测铜藻为了适应漂浮生境,其漂浮能力和有性生殖能力已经发生改变。

Sargassum horneri is an important part of the seaweed bed and is mainly distributed in areas west of the north Pacific.It is a type of temperate algae and of great significance to the marine environment and fishery resources.It can support benthic life in addition to floating life.The vesicle and receptacle are important parts of S.horneri,but the relationship with the floating lifestyle is still not clear.Herein,a quantitative analysis of the floating and attached algal vesicle and receptacle structures has been conducted through field investigation.Simultaneously,the microstructural characteristics of the receptacles derived from the two kinds of algae were compared.The results revealed that the vesicle volume of the floating samples is less than that of fixed algae(P<0.01).The number of receptacles for floating samples was significantly less than that for algae with holdfast(P<0.01).It is likely that the structure and reproductive ability of S.horneri changed as a result of living on the ocean surface after detaching from the bottom.