台湾以北海域浮游桡足类生物海洋学特征的研究Ⅲ.指示性种类

在对台湾以北海域浮游桡足类生物海洋学特征研究Ⅱ。群落特征研究的基础上,用不同生态类群的指示性种类分布来分析对应水系的变化过程。结果表明,普通波水蚤(Undinula vulgaris)和帽状真哲水蚤(Eucalanus pileatus)的数量分布可以指示台湾海峡水的季节变化和消长趋势;海洋真刺水蚤(Euchaetamarina)能反映黑潮表层水的影响程度;热带大洋高盐偏低温类群种类在陆架区的分布状况可反映黑潮次表层水的入侵涌升范围;中华哲水蚤(Chlanussinicus)的分布反映了沿岸水势力影响的季节差异,可能是受陆架区横向环流的影响,它能扩布到较远岸区域,此时该种类对偏低温的适宜性致使其在较低温水体中的丰度较高;对热带大洋低温高盐类群种类的研究发现,春季隆线似哲水蚤(Chlanoidescarinatus)在测区陆架区广泛分布是由冬季在台湾浅滩南部上升流区该种的大量涌现并随台湾海峡水北上携带而来的,然而,从隆线似哲水蚤和该类群另两种在陆坡下层的出现显示了中、深层水有可能在本区东南侧涌升。

Study on the biological oceanographic characteristics of planktonic copepods in the waters north of Taiwan Province Ⅲ. Indicator species

Based on the study of biological oceanographic characteristics of planktonic copepods in the waters north of Taiwan Province a Ⅱ-community characters,the relationshipe between various eootype indlcators and different water masses are discussed.The results show as follows:the abundance distributions of Undinula vulgaris and Eucalanus pileatus can indicate the seasonal ehanges and extending trends of the Taiwan Strait water.Euchaeta marina can refeet the influencing degree of the Kuroshio surface water.The distributions of tropic oceanic lower-temperature and high-saline species in the shelf area can indicate the scope of invading and upwelling of the Kuroshio subsurface water.The distributions of Calanus sinicus can reflect the seasonal difference of the coastal water expanding.Probably affected by transverse circulation in the shelf,Calaanus sinicus can extend to outshore area.Under this circumstance,the adaptability of the species for lower temperature causes its abundance to be higher in waters with relative low temperature.By researching the distributions of species of tropic oceanic Iow-temperature and high-saline group,it is found that the widespread distribution of Calannides carinatus in the shelf area in spring is probably because of the fact that the species occurs in the upwelling in Minnan-Taiwan Bank Fishing Ground waters in winter and then is carried forwards to north area with the Taiwan Strait water in spring.However,the occurrences of Calanoides carinatus and other two species of this group in the Iow layer of the slope show that the middle and deep waters possibly spring in the waters southeast of the survey area.