我国东南沿海亚历山大藻休眠孢囊的分布和萌发研究

对4个海域的塔玛亚历山大藻(Alerandrium tamarense)和链状亚历山大藻(A．catenella)休眠孢囊的分布及萌发进行了研究．结果表明，厦门港仅在X1和X2站位有分布，且密度很小(0．4个·g-1)；广西只在G2站位有发现，密度较少(2．5个·g-1泥样)．闽江口有3个站位有分布，M4站位的4～6cm层密度最大，达到6个·g-1泥样；长江口的孢囊分布广、密度大，DG-26站位的8～10cm层孢囊密度达到了23．2个·g-1泥样．孢囊的分布与沉积物底质类型、沉积速率、海流都有一定的关系．光照对孢囊萌发没有影响，温度升高导致萌发率和存活率均增大，而萌发时间缩短；在低氧条件下(0．01mgO2L-1)，孢囊萌发率为0．亚历山大藻孢囊在合适的环境条件下终年都会萌发

Distribution and germination of Alexandrium sp.cysts in coastal areas of Southeast China Sea

Studies on the distribution and germination of Alexandrium sp. (A. tamarense + A. catenella) cysts in coastal areas of Southeast China showed that the cysts were only found at X1 and X2 of Xiamen Harbor, whose density was quite low (0.4 ind.g-1). In Guangxi, the cysts were found at G2 station, with a density of 2.5 ind.g-1. There were cysts at three stations at Minjiang River estuary. The density reaches maximum value at 4-6 cm sediment of M4 station, up to 6 ind.g-1. In Changjiang River estuary, the cysts distributed widely and had the largest density, up to 23.2 ind.g-1 at 8-10 cm sediment of DG-26 station. The distribution of Alexandrium sp.cysts was relevant to sediment type, sedimentation rate and current. Light had no effect on germination. With increasing temperature, germination and survival rates also increased, while the germination time decreased. Anoxia (0.01 mg O2.L-1) inhibited germination completely. Alexandrium sp. cysts could germinate throughout the year under favorable conditions.