176
J. E. G . RAYMONT
than at high latitudes. The standing crop of phytoplankton is small and
as the different members of the zooplankton in tropical waters tend to
breed at different periods of the year, there is always a fairly ateady
grazing population and the phytoplankton never blooms excessively.
TABLE V
Comparison of Volumes of Zooplankton from Different Oceanic
and Coastal Regions
~~
-
_ _
. _
Plankton volume
(cma/ma)
Region
Winter Summer
Northern Atlantic - Iceland
Faroes, Greenland
0-84*
~~~~
~~
Authority
Coastal shelf, north-eastern U.S.A. 0.2-0.3 0.7-0.8 ~
i
~
~
l
~
and sears (1939)
North Sea
0-5-0-6
~ _ _ _ _
English Channel
0-1
____
Laptev and eastern Siberian Sea
0.07
Central Arctic Basin
0.01
Sea of Japan
0.03-0.5
1.0
Zenkevitch (1983)
Okhotsk Sea
1 -&3 *O
Bering Sea
1 *5-2 *5
_ _ _
Pearly Mean
~
~~~
Barents Sea
0.14
Zenkevitch (1963)
Australian oceanic waters
0.02-0 *05
Australian shelf waters
0.1
Trantor (1982)
Australian inshore waters
> 0.2
Subtropical Pacific
< 0.05
Equatorial Pacific
0.1
Boreal northern Pacific
0.5-1-0
Russian data quoted
by Tranter (1982)
New York- Bermuda
Coastal waters
Slope waters
Sargasso waters
1 *07
0.27
Grice and Harb (1962)
0.02
Most of smaller copepods not included owing to mesh size.