512
D. J. TRANTER:
immature. Such views are not universal (SLOBODKIN, 1969); nevertheless they hold great
artraction for planktologists who work with systems which show a rapid and measurable
response to environmental change.
The most useful measure of diversity is the Shannon-Wiener information function H
(MAcARTHUR,1965):
StPT
15°
2()0
25°
SPE:CIES OIV£ASITY
COPEPODA : OAV
110' E
N
H = - i ~ 1 Pi lOgePi
1962 HeN.
".o.N
"AR
()
0
r=J c:=J
d .
< 1
1-2
c3
o
1-2
CJ
2 - 2·'
2-2·5
1963
"A'
JULV
> 2.5
.. "
Fig. 15. Species diversity of selected copepods with respect to latitude and month. a Day; b Night
D. J. TRANTER:
immature. Such views are not universal (SLOBODKIN, 1969); nevertheless they hold great
artraction for planktologists who work with systems which show a rapid and measurable
response to environmental change.
The most useful measure of diversity is the Shannon-Wiener information function H
(MAcARTHUR,1965):
StPT
15°
2()0
25°
SPE:CIES OIV£ASITY
COPEPODA : OAV
110' E
N
H = - i ~ 1 Pi lOgePi
1962 HeN.
".o.N
"AR
()
0
r=J c:=J
d .
< 1
1-2
c3
o
1-2
CJ
2 - 2·'
2-2·5
1963
"A'
JULV
> 2.5
.. "
Fig. 15. Species diversity of selected copepods with respect to latitude and month. a Day; b Night