海洋底栖甲藻的浮游行为特征研究

STUDY ON PLANKTONIC CHARACTERISTICS OF MARINE BENTHIC DINOFLAGELLATES

研究了日本濑户内海屋岛湾沙质海滩底栖甲藻中具有底栖 浮游兼性行为的种类及其浮游行为特征。发现具有浮游兼性特征的有8种 ,分别是Amphidiniumcarterae,A.klebsii,A.herdmanae,Gymnodiniumsp1,G.pyrenoidosum,Peridiniumquinquecorne,Prorocentrumemargina tum和Pror.sp1,几乎全是该潮间带底栖甲藻的优势种 ,占水样中甲藻种数的11.6%。个体数占海水样品中甲藻总个体密度的0～51.3% ,具有明显的季节性。当这些种类在沉积物样品中数量较少时 ,在海水样品中就极少出现 ,具有随潮汐变化的行为特征。研究表明这些种类是真底栖种 ,浮游生活只是其兼性行为特征 ,是长期进化和对潮间带特殊环境适应的结果。本文还探讨了底栖甲藻的浮游习性及其与内湾近岸赤潮的关系和可能产生的影响。

A study on the plaktonic characteristics of benthic dinoflagellates was carried out in a sandy beach of Yashima Bay, the Seto Inland Sea, Japan. The result showed that eight species of benthic dinoflagellates, namely Amphidinium carterae, A. klebsii, Amph. herdmanae, Gymnodinium sp 1, G. pyrenoidosum, Peridinium quinquecorne, Prorocentrum emarginatum and Pror. sp 1, were presented in the seawater samples, accounting for 11.6% of total dinoflagellate species number and 0 -51.3% of dinoflagellate cell density found in the water column during the sampling period. Comparing the distribution patterns of their cell density in sand with that in water column, it revealed that all of the species should be regarded as benthos rather than plankton, implying that their planktonic behavior was only a kind of pluralistic characteristics of behavior, resulted from the adaptation of there dynamic habitat during the long-term succession. Finally, the potential outbreak of red tide and its influence, caused by benthic dinoflagellates, in the near shore and inner bay waters was discussed.