The results presented here suggest that the r and K populations of the bean weevil have differentiated from each other with respect to the following traits (Table 3): egg-to-adult viability at high larval density (K [greater than] r), preadult
developmental time (r [greater than] K), body weight (r [greater than] K), late fecundity (K [greater than] r), total fecundity (r [greater than] K), and longevity of the males (r [greater than] K).
Wyeomyia smithii completes its preadult
development only within the water-filled leaves of the purple pitcher plant, Sarracenia purpurea L.
Thus, having marshaled evidence from lines designed for the investigation of adult fitness trade-offs, we report on the evolution of 10 populations purpose-designed for the examination of trade-offs in the preadult
Using mathematical models, they show that the longer development time imposed by lower temperature will produce higher preadult
mortality, which in turn selects for reduced clutch size and larger offspring.
This was done so that the assay results would reflect effects of preadult
rearing environment on female fecundity (in addition to effects of adult environment on fecundity, and effects of preadult
environment on preadult
The adaptiveness of the response depends on the availability of some environmental "cue" during preadult
development that predicts the adult environment (Shapiro 1976).
It was implied from these data that the offspring of larger males had higher preadult
Egg to adult viability differences among karyotypes were observed among preadult
stages in flowers returned to the lab and exposed to contrasting temperatures (Brncic 1968).
There has therefore been no inadvertent direct selection on the preadult
stages by differential crowding or truncation of the distribution of adult emergences.
These data could suggest that adult life-history traits are slower or less likely to evolve in response to temperature than are preadult
traits, or the longer generation time of D.
Description: Primary heterosexual female: develops from preadult
fertilized female that enter into the host, in its body cavity, obese sausage-shaped curving ventrally, with round, wrinkled ends.
Life table and predation of Lemnia biplagiata (Coleoptera: Coccinelidae) fed on Aphis gossypii (Homoptera: Aphididae) with a proof on relationship among gross reproduction rate, net reproductive rate and preadult