EFFECT OF VERTICAL MIXING ON THE VERTICAL-DISTRIBUTION OF COPEPODS INCOASTAL WATERS

The vertical distribution of copepod adult stages and nauplii had been studied in a coastal water before and during homogenization of the wa ter column due to wind. When the water column was stratified, the vert ical distribution of the zooplankton was also stratified, as is genera lly described in the literature. During homogenization of the water co lumn different patterns of vertical distribution were observed. The le ss active nauplius stage was evenly distributed, even though adult sta ges always exhibited a stratified distribution. Oithona similis and Mi crosetella norvegica exhibited the same distribution in stratified and unstratified water columns. Temora longicornis and Pseudocalanus sp. were deeply distributed in a less turbulent area. The causes of these changes are discussed.