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Population dynamics of luehdorfia japonica leech lepidoptera papilionidae ii. patterns of mortality in immatures in relation to egg cluster size



Population dynamics of luehdorfia japonica leech lepidoptera papilionidae ii. patterns of mortality in immatures in relation to egg cluster size



Researches on Population Ecology 32(1): 173-188



Mortality processes from egg to final instar larval stage are examined in the papilionid butterfly Luehdorfia japonica for two generations in a natural population. Special attention is given to the effects of initial egg cluster size on the survival rate by the 3rd instar. Mean egg cluster sizes for the two generations were 11.3 and 10.7. The hatching rate was not affected by the egg cluster size. Up to 3rd instar, larvae in a group were more likely to die en masse rather than to die individually, whereas most larvae in later instars died independently. The egg clusters of the average (and the most frequent) sizse class (11 .+-. 1) had the second highest survival rate until the 3rd instar. A slightly higher survival rate occurred in clusters a little larger (14 .+-. 1). The average size clusters were least likely to be exterminated and about 70% of them produced at least one individual suriving to the 3rd instar. Factors affecting the observed mortality patterns were discussed.

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