摘要
江苏镇江长江豚类保护区是唯一没有被开辟为主航道的长江干流豚类保护区,是长江下游少有的长江江豚的优良栖息地。为了解这一地区的浮游动物群落特征,2010-2011年对镇江保护区进行了4个季度的考察和调研。结果表明,在浮游动物种类数和丰度上,原生动物和轮虫占据主导地位,但浮游动物生物量主要由枝角类和桡足类决定。保护区2(现有保护区)的物种丰度、物种多样性及生物量都要明显高于保护区1(拟扩展保护区)和主航道。浮游动物各类群随季节的变化不尽相同,原生动物和轮虫的密度高峰主要出现在春季,而枝角类和桡足类密度高峰主要出现在秋季。浮游动物多样性指数在夏季和秋季时高,在冬季时最低。对不同采样点浮游动物群落的季节变化研究发现,受干扰较多的主航道表现出更明显的季节性。结合浮游动物的渔产潜力评估,认为保护区能够满足江豚生存的鱼类资源量已趋紧张。
The Zhenjiang Yangtze Dolphin nature reserve in Jiangsu Province, as the rare excellent habitat for Yangtze Dolphin, is the only nature reserve along Yangtze River which has not been exploited for main channel. In order to understand the community structure of zooplankton in this area, seasonal investigation was performed through 2010 to 2011. The results showed that protozoa and rotifers took the dominant places, while the biomass of zooplankton lied on the cladocerans and the copepods. The species abundance, species diversity and biomass of Conservation Area 2 were much higher than other places. Seasonality of different members varied within zooplankton community. The breeding peaks of protozoa and rotifers appeared mainly in spring, while cladocerans and copepods in autumn. The diversity index of zooplankton peaked in summer and autumn, and bottomed out in winter. Through comparing the seasonal variability of zooplankton in different sampling sites, the Main Channel being more disturbed showed more seasonality. Fish potential production estimation through zooplankton showed that food sources of Yangtze Dolphin were being threatened.
出处
《水生态学杂志》
北大核心
2011年第5期30-36,共7页
Journal of Hydroecology
基金
国家重点基础研究发展计划(2008CB418105)资助
关键词
镇江
长江江豚保护区
浮游动物
季节演替
Zhenjiang
Yangtze dolphin nature reserve
zooplankton
seasonal variation
