中越边境北仑河口地区缝舟藻(Rhaphoneis)新变种记录

NEW VARIETIES OF RHAPHONEIS (DIATOM) FROM THE BEILUN RIVER ESTUARY,SINO-VIETNAM BORDER

通过对中越边境北仑河口地区我国一侧表层和钻孔沉积硅藻的鉴定和研究,在该地区首次发现了卡氏缝舟藻(Rhaphoneis castracanei)的4个新变种和双角缝舟藻四角形变种(Rhaphoneis amphiceros var.tetragona)的1个新变形,为沿岸和潮间带古环境研究如海平面变化和河口地区盐度的变化等提供新的基础材料。

Surface and core sedimentary diatoms from surface sediment and core in the Beilun estuary on Sino-Vietnam Border were analyzed in this paper.Four new varieties of Rhaphoneis castracanei and a new heteromorphosis of Rhaphoneis amphiceros var.tetragona were firstly found in this region.This study can provide new basic information for coastal and intertidal paleoenvironment conditions,such as sea level change and salinity variation in estuary.