ANALYSIS OF SELECTION PROCESSES USING THE INCOMPLETELY-PENETRANT MUTANT eu OF TRIBOLIUM CASTANEUM

1979 ◽  
Vol 21 (3) ◽  
pp. 405-415 ◽  
Author(s):  
David Wool ◽  
Orna Bergerson
Keyword(s):  
Genetic Markers ◽  
Tribolium Castaneum ◽  
The Body ◽  
Adult Survival ◽  
Body Color ◽  
Strong Selection ◽  
Flour Beetle ◽  
Mortality Selection ◽  
Selection Processes ◽  
Selection For

Two genetic markers were followed for ten generations in one hybrid and two control populations of the flour beetle Tribolium castaneum (Herbst). The incompletely-penetrant eu changes the number of terminal appendages in the larva and the pupa (urogomphi) from the normal 2 to 3 or 4, and the semi-dominant b changes the body color from brown to black in adult beetles. Three simultaneous selective processes were discovered. There was strong selection against eu, mainly through lowered eu/eu adult fecundity and zygote mortality. Selection against genes linked to b may have caused its decline from 50 to 40% in ten generations. Egg to adult survival increased considerably in all three populations, apparently due to selection for improved fertility at 25 °C imposed by the experimental regime.

scholarly journals Responses to relaxed and reverse selection in strains artificially selected for duration of death-feigning behavior in the red flour beetle, Tribolium castaneum

2018 ◽  
Vol 36 (2) ◽  
pp. 161-168 ◽  
Author(s):  
Kentarou Matsumura ◽  
Takahisa Miyatake
Keyword(s):  
Genetic Variation ◽  
Tribolium Castaneum ◽  
Red Flour Beetle ◽  
Term Selection ◽  
Flour Beetle ◽  
Death Feigning ◽  
Selection Experiments ◽  
Selection For ◽  
Predator Behavior

Abstract Divergent lines selected artificially for many generations make it possible to answer two questions: (1) whether genetic variation still exists within the selected population; and (2) whether the selection itself is costly for the selected strain. In previous studies, the red flour beetle Tribolium castaneum was divergently selected artificially for duration of death-feigning, and strains selected for longer (L-strain) and shorter (S-strain) durations of death-feigning have been established (Miyatake et al. 2004, 2008). Because the selection experiments have been conducted for more than 27 generations, genetic variation may be eroded. Furthermore, because another previous study reported physiological costs to L-strains, the L-strains selected artificially for longer duration of death-feigning may have suffered more costs than the S-strains. In the present study, therefore, we relaxed the selection pressure after the 27th or 30th generation of S- and L-strains. We also carried out reverse selection during the most recent eight generations of S- and L-strains. The results showed that each strain clearly responded to relaxation of selection and reverse selection, suggesting that (1) additive genetic variation still existed in both strains after long-term selection, and (2) selection for shorter and longer duration of death-feigning was costly. These results suggest that anti-predator behavior is controlled by many loci, and longer or shorter duration of death-feigning is costly in a laboratory without predators.

scholarly journals Lines selected for different durations of tonic immobility have different leg lengths in the red flour beetle Tribolium castaneum

Behaviour ◽  
2019 ◽  
Vol 157 (1) ◽  
pp. 17-31 ◽  
Author(s):  
Kentarou Matsumura ◽  
Takahisa Miyatake
Keyword(s):  
Tribolium Castaneum ◽  
Selection Pressure ◽  
Morphological Traits ◽  
Tonic Immobility ◽  
Red Flour Beetle ◽  
Leg Length ◽  
Flour Beetle ◽  
Selection For ◽  
Species Movement ◽  
Predator Behaviour

Abstract Tonic immobility is an adaptive anti-predator behaviour observed in many species. This anti-predator behaviour is often correlated with a species’ movement motivation, so a relationship between the duration of tonic immobility and morphological traits supporting movement would be expected. Using the red flour beetle, Tribolium castaneum, we carried out two-way artificial selection for the duration of tonic immobility over more than 43 generations, establishing populations with longer (L) and shorter (S) tonic immobility durations compared to those of a non-selected control (C) population. Here, we investigated differences in walking motivation and leg length between the selected populations. Walking motivation was significantly higher in beetles from the S population than that in those from the L population. Moreover, S-population beetles of both sexes had significantly longer legs than those from L and C populations. The present results suggest the evolution of longer legs in response to selection pressure for a shorter duration of tonic immobility in T. castaneum.

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