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水团对吕宋海峡浮游植物群落结构的影响

, PP. 178-189

Keywords: 浮游植物,群落结构,吕宋海峡,锋面

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Abstract:

根据2008年8月18日至9月19日在吕宋海峡3个断面获得的0~200m层浮游植物数据,探讨了群落结构及其与不同理化性质水团的关系。本研究共鉴定浮游植物4门61属169种(包括变种、变型和未定种),其中甲藻和硅藻物种数基本相当,各占所有物种数的50%左右;另记录了金藻门3属3种;蓝藻门1种。海区优势种为卡氏前沟藻Amphisdiniumcarterae、锥状施克里普藻Scrippsiellatrochiodea、角毛藻Chaetocerossp.和原甲藻Prorocentrumsp.。丰度范围是(0.08~9.48)×106个/m3,平均为1.448×106个/m3。甲藻占总细胞丰度的74.68%;硅藻占24.96%。在水平方向,B断面和C5站浮游植物丰度较高,甲藻主要分布于远离陆地的海峡中部,而硅藻主要分布于台湾岛和吕宋岛附近;浮游植物垂直分布主要在水体的0~50m层。聚类分析并结合水文数据表明浮游植物基本可划分为3个类群,分别受南海水、黑潮水和混合水的影响。南海水与黑潮水交汇的锋面区域,具有较周围区域更高的物种数、水柱平均丰度及硅甲藻丰度比,体现出强烈的锋面效应。

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