The Use of Chaetognath and Copepod Population Age-Structures as an Indication of Similarity between Water Masses

Abstract

Zooplankton samples were collected in northern, western, and southwestern British waters in September-October, 1963 and in the western and middle part of the North Seain November, 1963. The origin of water masses was determined by identifying indicator species among the chaetognaths and copepods. The age-structure of predominant species was used as indicator of the similarity between water masses within the area. Temperature and salinity data bearing upon population age-structure are also given.