黄海太平角鼠尾藻有性繁殖分配

Sexual reproductive allocation of Sargassum thunbergii at Taiping Cape of Yellow Sea

以位于黄海的青岛太平角自然生长的鼠尾藻为对象,研究其有性繁殖分配动态及相关环境因子.结果表明:鼠尾藻于6月初开始进入有性繁殖期,于7月中旬海水温度22℃左右达到繁殖高峰,7月19日平均繁殖分配(RA)达76.7%,8月末有性繁殖结束.鼠尾藻繁殖分配与平均分枝长度呈显著线性相关(r=0.855,P<0.01).长度在10cm以下的藻体在整个繁殖期内的RA较低,而长度在10cm以上的藻体在成熟高峰期的RA在70.0%以上.析因方差分析表明,潮位和浪冲击度均对鼠尾藻有性繁殖分配有显著影响(潮位:F=175.62,P<0.001,浪冲击度:F=95.35,P<0.01),且二者之间存在交互作用(F=9.14,P<0.05).其对RA的影响大小依次为潮位>浪冲击度>潮位×浪冲击度.

This paper studied the dynamics of reproductive allocation（RA） of Sargassum thunbergii during its sexual reproductive season and the related environmental factors at the Taiping Cape of Yellow Sea.The sexual reproduction of S.thunbergii initiated in early June,peaked in mid July when the sea water temperature was about 22 ℃（the mean proportion of biomass allocated to reproductive organs on July 19 was 76.7%）,and ended in late August.The RA had a significant linear correlation with the average length of thallus branches（r=0.855,P0.01）.The thalli with a length less than 10 cm showed a lower RA in the whole sexual reproductive season,while the thalli longer than 10 cm had a RA up to averagely 70.0% at the peak maturing stage.UNIANOVA analysis showed that both tidal level and wave strength had significant effects on the RA of S.thunbergii（tidal level：F=175.62,P0.01;wave strength：F=95.35,P0.01）,and there was a significant interaction between tidal level and wave strength（F=9.14,P0.05）.The sizes of the effects were in the order of tidal level wave strength tidal level × wave strength.