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• W1977817969 abstract "Four types of laboratory populations of the bean weevil (Acanthoscelides obtectus) have been developed to study the effects of density‐dependent and age‐specific selection. These populations have been selected at high (K) and low larval densities (r) as well as for reproduction early (Y) and late (O) in life. The results presented here suggest that the r‐ and K‐populations (density‐dependent selection regimes) have differentiated from each other with respect to the following life‐history traits: egg‐to‐adult viability at high larval density (K > r), preadult developmental time (r > K), body weight (r > K), late fecundity (K > r), total realized fecundity (r > K), and longevity of males (r > K). It was also found that the following traits responded in statistically significant manner in populations subjected to different age‐specific selection regimes: egg‐to‐adult viability (O > Y), body weight (O > Y), early fecundity (Y > O), late fecundity (O > Y), and longevity of females and males (O > Y). Although several life‐history traits (viability, body weight, late fecundity) responded in similar manner to both density‐dependent and age‐specific selection regimes, it appears that underlying genetic and physiological mechanisms responsible for differentiation of the r/K and Y/O populations are different. We have also tested quantitative genetic basis of the bean weevil life‐history traits in the populations experiencing density‐dependent and age‐specific selection. Among the traits traded‐off within age‐specific selection regimes, only early fecundity showed directional dominance, whereas late fecundity and longevity data indicated additive inheritance. In contrast to age‐specific selecton regimes, three life‐history traits (developmental time, body size, total fecundity) in the density‐sependent regimes exhibited significant dominance effects. Lastly, we have tested the congruence between short‐term and long‐term effects of larval densities. The comparisons of the outcomes of the r/K selection regimes and those obtained from the low‐ and high‐larval densities revealed that there is no congruence between the selection results and phenotypic plasticity for the analyzed life‐history traits in the bean weevil." @default.
• W1977817969 created "2016-06-24" @default.
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• W1977817969 date "1997-12-01" @default.
• W1977817969 modified "2023-10-17" @default.
• W1977817969 title "LABORATORY EVOLUTION OF LIFE-HISTORY TRAITS IN THE BEAN WEEVIL (<i>ACANTHOSCELIDES OBTECTUS):</i>THE EFFECTS OF DENSITY-DEPENDENT AND AGE-SPECIFIC SELECTION" @default.
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• W1977817969 doi "https://doi.org/10.1111/j.1558-5646.1997.tb05112.x" @default.
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