Inbreeding: Its Effect on Response to Selection for Pupal Weight and the Heritable Variance in Fitness in the Flour Beetle, Tribolium castaneum

Evolution ◽  
1996 ◽  
Vol 50 (2) ◽  
pp. 723 ◽  
Author(s):  
Michael J. Wade ◽  
Stephen M. Shuster ◽  
Lori Stevens
Keyword(s):  
Tribolium Castaneum ◽  
Pupal Weight ◽  
Response To Selection ◽  
Flour Beetle ◽  
Selection For

TWO-WAY SELECTION ON PUPAL WEIGHT WITH DIFFERENT DEGREES OF INBREEDING IN TRIBOLIUM CASTANEUM

1974 ◽  
Vol 16 (4) ◽  
pp. 765-775 ◽  
Author(s):  
P. Y. Jui ◽  
G. W. Friars
Keyword(s):  
Tribolium Castaneum ◽  
Linear Response ◽  
Significant Interaction ◽  
Pupal Weight ◽  
Base Population ◽  
Significant Progress ◽  
Selected Lines ◽  
Selection Limit ◽  
Selection For ◽  
Seven Generations

Responses to selection for high and low pupal weight in Tribolium castaneum under four different inbreeding systems and two different relative humidities (40 and 70%) were observed for seven generations. By the seventh generation, the coefficients of inbreeding ranged from 0.79 in the full sib lines to 0.12 in the control lines.Heritability of pupal weight estimated by mid-parent offspring regression from the base population was around 0.30 which is lower than the estimates obtained by Bell (1969). However, realized heritabilities were around 0.50. Significant progress was observed for both upward and downward selection. A linear response in pupal weight was observed for most of the selected lines, suggesting that the selection limit had not been reached.Inbreeding caused a reduction of approximately two offspring per 10% increment in the inbreeding coefficient.Asymmetric responses were noted in conjunction with the significant interaction of the degree of inbreeding and the direction of selection.

COMPONENTS OF GROWTH IN GENETICALLY DIVERSE POPULATIONS OF TRIBOLIUM CASTANEUM

1969 ◽  
Vol 11 (4) ◽  
pp. 896-907 ◽  
Author(s):  
DuWayne C. Englert ◽  
A. E. Bell
Keyword(s):  
Tribolium Castaneum ◽  
Adult Emergence ◽  
Pupal Weight ◽  
Diverse Populations ◽  
Correlated Responses ◽  
Larval Weight ◽  
Developmental Patterns ◽  
Adult Weight ◽  
Total Growth ◽  
Selection For

The growth and developmental patterns of 19 genetically diverse populations of Tribolium castaneum were examined. Measurements were obtained on three primary traits (13-day larval weight, pupation time and pupal weight) and three secondary traits (number of larval molts, adult emergence time and adult weight). The populations were chosen on the basis of their previous selection histories. Selection for different primary traits produced profound effects upon the total growth and development complex.Genetic and environmental relationships between primary traits were estimated within each population, and a consistent asymmetry of correlated responses was observed to be determined by the direction of selection.Possible effects upon the disruption of an intricate balance of the three metamorphosis hormones (activation, molting and juvenile) through selection were postulated.

The effects of alternated cycles of full-sib and random mating on selection for pupa weight in Tribolium castaneum

1985 ◽  
Vol 27 (2) ◽  
pp. 251-254 ◽  
Author(s):  
Nicole Dion ◽  
Francis Minvielle
Keyword(s):  
Mating System ◽  
Tribolium Castaneum ◽  
Random Mating ◽  
Selection Response ◽  
Inbred Lines ◽  
Pupal Weight ◽  
Realized Heritability ◽  
Differential Selection ◽  
Selection For

Individual responses to selection for high pupal weight in Tribolium castaneum under two types of mating, cyclic full-sib random-mating system and random mating, were observed for 15 generations. No significant differences have been observed between the two types of mating for the selection response, differential selection, realized heritability, and the number of larvae per generation. Realized heritability of the pupal weight was 0.33 ± 0.02 and 0.42 ± 0.02 for the inbred lines and for the random-mated lines, respectively.Key words: inbreeding, pupa weight, Tribolium.

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.

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.

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