Crustacea
These are the most conspicuous element in the permanent zooplankton, commonly amounting numerically to at least 70 per cent of the total. The predominant class is the Copepoda. These are present in incredible numbers and are represented by many species. There are about 1200 species in the British sea area, of which Calanus Marshall and Orr, 1955 , Acartia, Centropages, Temora, Oithona, Pseudocalanus and Paracalanus are especially common Figure 2.10 . Another abundant group of planktonic...