Directional and stabilizing selection for developmental time and correlated response in reproductive fitness in Tribolium castaneum

1982 ◽  
Vol 63 (2) ◽  
pp. 111-116 ◽  
Author(s):  
M. H. Soliman
Keyword(s):  
Tribolium Castaneum ◽  
Developmental Time ◽  
Reproductive Fitness ◽  
Correlated Response ◽  
Stabilizing Selection ◽  
Selection For

THE RELATION BETWEEN DISPERSAL BEHAVIOR AND REPRODUCTIVE FITNESS IN THE FLOUR BEETLE TRIBOLIUM CASTANEUM

1978 ◽  
Vol 20 (4) ◽  
pp. 589-595 ◽  
Author(s):  
Batia Lavie ◽  
Uzi Ritte
Keyword(s):  
Tribolium Castaneum ◽  
Correlation Coefficients ◽  
Developmental Time ◽  
Reproductive Fitness ◽  
Fitness Component ◽  
Flour Beetle ◽  
High Dispersal ◽  
Dispersal Behavior ◽  
The Relationship ◽  
Successful Colonization

Assuming that dispersal from optimal environments evolved as a colonizing device, it is expected that dispersants will possess reproductive characteristics enhancing the probability of successful colonization. Two approaches were used to clarify the relationship between dispersal behavior and two major components of reproductive fitness (developmental time and fecundity) in the flour beetle Tribolium castaneum: (a) comparison between two lines, one selected for low dispersal and the other selected for high dispersal, for several components of reproductive fitness, and (b) calculation of the correlation coefficients between each fitness component investigated and dispersal behavior. The results obtained by both approaches indicate, as expected, shorter developmental time and higher fecundity for dispersants than for nondispersants.

CORRELATED RESPONSE TO NATURAL SELECTION IN LABORATORY POPULATIONS OF TRIBOLIUM CASTANEUM

1972 ◽  
Vol 14 (4) ◽  
pp. 971-978 ◽  
Author(s):  
M. Hani Soliman
Keyword(s):  
Natural Selection ◽  
Tribolium Castaneum ◽  
Correlation Coefficients ◽  
Developmental Time ◽  
Correlated Response ◽  
Larval Weight ◽  
Laboratory Populations ◽  
Old Adult

Intra- and interpopulation correlations between productivity and period of productivity were significant. One-day-old pupae and one-day-old adult weights were not associated with productivity. The intrapopulation correlation coefficients between productivity and developmental time were found to be significant. However, all of them (except one) were negative. Significant interpopulation relationships were noted when productivity was correlated with 13-day larval weight and with developmental time. Positive and negative correlations were found between productivity-larval weight and productivity-developmental time, respectively. It is concluded that developmental time is the most important factor in controlling productivity in T. castaneum under the constant conditions of the present investigation.

scholarly journals DIRECTIONAL versus STABILIZING SELECTION FOR DEVELOPMENTAL TIME IN NATURAL AND LABORATORY POPULATIONS OF FLOUR BEETLES

Genetics ◽  
1975 ◽  
Vol 80 (4) ◽  
pp. 773-783
Author(s):  
Peter S Dawson
Keyword(s):  
Rapid Development ◽  
Natural Populations ◽  
Developmental Time ◽  
The Other ◽  
Stabilizing Selection ◽  
Flour Beetles ◽  
Laboratory Populations ◽  
Fast Development ◽  
Selection For ◽  
Synchronized Cultures

ABSTRACT Artificial selection for fast development is successful in long-established laboratory populations of Tribolium, but not in strains recently derived from natural populations. It is shown that selection against fast development in dense, synchronized cultures operates through cannibalism of early pupae by larvae. Since standard husbandry procedures for laboratory strains involve the periodic creation of dense, synchronized cultures, it is suggested that these populations are subjected to stabilizing selection for intermediate developmental time. Natural populations, on the other hand, are probably subjected to directional selection for rapid development.

scholarly journals STABILIZING SELECTION FOR PUPA WEIGHT IN TRIBOLIUM CASTANEUM

Genetics ◽  
1977 ◽  
Vol 87 (2) ◽  
pp. 327-341
Author(s):  
Pamela K Kaufman ◽  
Franklin D Enfield ◽  
Ralph E Comstock
Keyword(s):  
Genetic Variability ◽  
Tribolium Castaneum ◽  
Genetic Variance ◽  
Additive Genetic Variance ◽  
Heterozygote Advantage ◽  
Stabilizing Selection ◽  
Phenotypic Variance ◽  
Sources Of Variation ◽  
Selection For

ABSTRACT Ninety-five generations of stabilizing selection for pupa weight in Tribolium castaneum resulted in a significant decrease in phenotypic variance, moderate reductions in additive genetic variance, but only slight changes in heritability for the trait. Sterility was significantly lower and the average number of live progeny per fertile mating was significantly higher in populations where stabilizing selection was practiced as compared with random selected populations. The results indicate that more genetic variability is being maintained than would be expected unless a fraction of the genes have a heterozygote advantage on the fitness scale. The reduction in phenotypic variance indicated that the populations with stablizing selection became somewhat more buffered against environmental sources of variation over the course of the experiment.

Correlated response to selection for litter size in pigs: II. Carcass, meat, and fat quality traits

2002 ◽  
Vol 80 (10) ◽  
pp. 2566 ◽  
Author(s):  
J. Estany ◽  
D. Villalba ◽  
M. Tor ◽  
D. Cubiló ◽  
J. L. Noguera
Keyword(s):  
Litter Size ◽  
Correlated Response ◽  
Quality Traits ◽  
Response To Selection ◽  
Fat Quality ◽  
Selection For

Correlated response of flesh color to selection for harvest weight in coho salmon ( Oncorhynchus kisutch )

Aquaculture ◽  
2017 ◽  
Vol 472 ◽  
pp. 38-43 ◽  
Author(s):  
Pablo Dufflocq ◽  
Jean P. Lhorente ◽  
Rama Bangera ◽  
Roberto Neira ◽  
Scott Newman ◽  
...  
Keyword(s):  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Correlated Response ◽  
Flesh Color ◽  
Selection For

Selection for components of efficient lean growth rate in pigs 2. Selection pressure applied and direct responses in a Landrace herd

1994 ◽  
Vol 59 (2) ◽  
pp. 263-269 ◽  
Author(s):  
N. D. Cameron ◽  
M. K. Curran
Keyword(s):  
Growth Rate ◽  
Genetic Correlations ◽  
Correlated Response ◽  
Selection Line ◽  
Control Line ◽  
Direct Response ◽  
Lean Growth ◽  
Ad Libitum ◽  
Selection For ◽  
Ad Libitum Feeding

AbstractResponses to divergent selection for lean growth rate with ad-libitum feeding (LGA), for lean food conversion (LFC) and for daily food intake (DFI) in Landrace pigs were studied. Selection was practised for four generations with a generation interval ofl year. A total of 2642 pigs were performance tested in the high, low and control lines, with an average of 37 boars and 39 gilts performance tested per selection line in each generation. The average within-line inbreeding coefficient at generation four was equal to 0·04. There was one control line for the DFI and LFC selection groups and another control line for the LGA selection group. Animals were performance tested in individual pens with mean starting and finishing weights of 30 kg and 85 kg respectively with ad-libitum feeding. The selection criteria had phenotypic s.d. of 32, 29 and 274 units, for LGA, LFC and DFI, respectively, and results are presented in phenotypic s.d.Cumulative selection differentials (CSD) were 5·1, 4·5 and 5·5 phenotypic s.d. for LGA, LFC and DFI, respectively. Direct responses to selection were 1·4,1·1 and 0·9 (s.e. 0·20) for LGA, LFC and DFI. In each of the three selection groups, the CSD and direct responses to selection were symmetric about the control lines. The correlated response in LFC (1·1, s.e. 0·19) with selection on LGA was equal to the direct response in LFC. In contrast, the direct response in LGA was greater than the correlated response (0·7, s.e. 0·18) with selection on LFC. There was a negative correlated response in DFI (-0·6, s.e. 0·18) with selection on LFC, but the response with selection on LGA was not significant (0·2, s.e. 0·16).Heritabilities for LGA, LFC and DFI ivere 0·25, 0·25 and 0·18 (s.e. 0·03), when estimated by residual maximum likelihood, with common environmental effects of 0·12 (s.e. 0·02). Genetic correlations for LFC with LGA and DFI were respectively positive (0·87, s.e. 0·02) and negative (-0·36, s.e. 0·09), while the genetic correlation between DFI and LGA was not statistically different from zero, 0·13 (s.e. 0·10). Selection on components of efficient lean growth has identified LGA as an effective selection objective for improving both LGA and LFC, without a reduction in DFI.

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