Genetic analysis of larval feeding behaviour in Drosophila melanogaster.
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TL;DR: Larvae of the slow feeding populations showed a correlated reduction in locomotor activity but fast feeding larvae do not move about significantly faster than the unselected controls, suggesting asymmetry of the correlated response to selection.
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Abstract: The larvae of Drosophila melanogaster feed continuously during their period of development. The rate of feeding activity, measured as the number of cephalopharyngeal retractions per minute, varies with the physiological age of the larva. Feeding rate responded readily to directional selection to give rise to non-overlapping populations with fast and slow feeding larvae, respectively. Realized heritabilities for the character from different selected lines varied between 11 and 21%. Crosses between the selected populations show significant dominance for fast feeding rate and appreciable non-allelic gene interaction. Larvae of the slow feeding populations showed a correlated reduction in locomotor activity but fast feeding larvae do not move about significantly faster than the unselected controls. Asymmetry of the correlated response to selection, it is argued, is due to selection in the slow feeding populations of alleles with a secondary effect in both behaviours.
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Foraging strategies of Drosophila melanogaster: a chromosomal analysis.
TL;DR: The two foraging strategies in Drosophila melanogaster are discussed in the light of resource utilization in environments where food is distributed continuously or discontinuously, and differences in larval locomotor behavior and feeding rate are affected additively by both the second and third chromosomes.
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Theoretical and Empirical Examination of Density-Dependent Selection
TL;DR: A major transition from field-based observations and conjecture to carefully controlled laboratory selection experiments has permitted crucial tests of theories of density-dependent natural selection and a deeper understanding of the mechanisms of adaptation to different levels of population crowding.
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Thermal evolution of egg size in drosophila melanogaster.
TL;DR: It is not clear which life‐history traits are direct targets of thermal selection and which are showing correlated responses, and disentangling these is a task for the future.
178
Responses and correlated responses to artificial selection on thorax length in drosophila melanogaster.
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TL;DR: The observed evolutionary increase in body size in response to reduced temperature in Drosophila must involve either different genes from those subject to selection for size at a single temperature, or a fitness component other than preadult survival.
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