摘要
根据2002-2003年长江口28°00′-2°00′N、122°00′-123°30′E海域4个季节的海洋调查资料,运用定量、定性方法,探讨了长江口邻近海域浮游软体动物总丰度的平面分布、季节变化、种类组成及优势种的环境适应类型。结果表明,长江口海域浮游软体动物总丰度分别为:春季64.61ind/m3,夏季191.84ind/m3,秋季59.11ind/m3,冬季1.4ind/m3。四季共出现软体动物24种,其中春季8种,夏季21种,秋季10种,冬季2种。马蹄螔螺(Limacina trochiformis)适温较低,是春季主要优势种;明螺(Atlanta peroni)作为暖水种,是夏季主要的优势种;秋季主要优势种为尖笔帽螺(Creseis acicula),适应于较高的水温;强卷螺(Agadina stimpsoniji)适温较低,是冬季的主要优势种。春季浮游软体动物大多聚集在苏北沿岸流和长江径流交汇处或偏沿岸流一侧,夏季在河口咸淡水水团内,秋季的高丰度则主要出现在台湾暖流和长江径流交汇偏暖水的一侧,冬季出现种类较少,低温是其最主要的因素。浮游软体动物作为一种偏大洋性的种类,在外海的数量和种类分布要远高于近海。
Abstract： Based on the data of four seasonal investigations in Yangtze River estuary （28°00′-2°00′N、122°00′-123°30′E） from the year 2002 to 2003, the distribution pattern of pelagic mollusc, the seasonal changes of total abundance and the species composition were analyzed. Furthermore, environmental adaptation of dominant species was deduced through scatter plot of abundance and temperature-salinity. The results showed that the seasonal abundance were 64.61 ind/m3 in spring, 191.84 ind/m3 in summer, 59.11 ind/m3 in autumn, and 1.4 ind/ m3 in winter. There were twenty-four species in four seasons. The mollusc species number peaked in summer （21 species）, followed by autumn （10 species）, spring （8 species） and winter （2 species）. Numerically, Limacina trochiformis was the main dominant specis in spring, attributed to its low temperature adaptation. Atlanta peroni was the dominant species in summer and Creseis acicula was the dominant species in autumn due to their adaptation to relatively high temperature. Agadina stimpsoniji was the dominant species in winter, adapted to low temperature. In spring, pelagic mollusc aggregated in the waters where Yellow Sea Coastal Current meets Changjiang Diluted Water. While in autumn, the pelagic monllusc were abundant at the warm water side of the mixed water mass where the Taiwan Warm Current meets Yangtze River diluted water. The pelagic mollusc species number was few in the low temperature of winter, because most pelagic mollusc is warm water species. Abundance and species number were low in the nearshore than in the offshore of the East China Sea, because most of the pelagic mollusc are offshore water species. [Journal of Fishery Sciences of China, 2008, 15 （6） ： 976-983]
出处
《中国水产科学》
CAS
CSCD
北大核心
2008年第6期976-983,共8页
Journal of Fishery Sciences of China
基金
国家自然科学基金重大研究计划项目(90511005)
上海市科委(062358101)
上海市908专项(PJ1-1)
关键词
浮游动物
软体动物
优势种
生态类型
长江口
zooplankton
mollusc
dominant species
ecotype
Yangtze River estuary
