2 84
H . KLOMP
The k-values are presented in Fig. 34. It is shown that the agreement
between total larval mortality and juvenile?mortality is reasonably
good. The direction of change is opposite in 1961 only. When the
mortalities of advanced larvae and prepupae are considered jointly
(k4-,) there also seems to be a (less pronounced) relation. However, for
the years that k4-, can be divided up in k4-5 and k, neither of these components seems to bear any relation to the fluctuations of larval mortality. Thus, the visual consideration of Fig. 34 does not provide a clear
insight into the contribution of the sub-mortalities to the causation of
total larval mortality fluctuations, Therefore this question is studied
again quantitatively with correlation analysis.
L -VALUE
4 3 .
LARVAL MORTALITY
(4- ke)
1.0 -
0.5.
*
@
1
l
1
1
1
1
1
1
1
4.0
JUVENILE
MORTALITY (kz-k3)
0.5.
0.0.
\-- -.
, .
* '
1950
'
IB52
'
19'51
' 49k6 - lQk6 * 1960 ' 1%2'
FIG. 34. Comparison of fluctuations of larval mortality in the juvenile, advanced, and
prepupal stages wit,h total larval mortality.