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桑沟湾浮游纤毛虫丰度和生物量分布的季节变化

DOI: 10.3969/j.issn.0253-4193.2013.03.025, PP. 215-224

Keywords: 浮游纤毛虫,丰度,生物量,季节变化,桑沟湾

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Abstract:

于2011年4、8、10月及2012年1月对桑沟湾进行了浮游纤毛虫丰度和生物量的季节调查。纤毛虫的平均丰度为(7552±10979)个/L,范围为408~61667个/L;纤毛虫的平均生物量(以碳计)为(4.79±5.77)μg/L,范围为0.35~33.09μg/L。无壳纤毛虫丰度和生物量主要分布在湾内,湾中和湾外丰度相对较低;砂壳纤毛虫丰度和生物量在盐度较高的海区总体较高,呈现朝向外海分布的趋势。纤毛虫丰度和生物量的高值区春季主要出现在湾的西北,夏季向湾中部迁移,秋季主要出现在湾的西南,冬季主要出现在湾的西部,高值区随季节大致呈顺时针迁移的趋势。纤毛虫的丰度春季最高,冬季最低;生物量夏季最高,冬季最低。无壳纤毛虫夏季粒级较大,冬季粒级较小;砂壳纤毛虫壳的平均口径夏季较大,秋季较小。共鉴定出砂壳纤毛虫8属27种,其中拟铃虫属(Tintinnopsis)种数最多。砂壳纤毛虫在纤毛虫总丰度中的比例平均为16.3%±21.9%,夏季最高(36.3%±27.8%),冬季最低(4.9%±5.9%)。纤毛虫丰度与温度、盐度、Chla浓度及微微型真核浮游生物丰度均没有明显的相关性,但与蓝细菌及异养细菌丰度呈显著的正相关关系。

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