Unpredictability of Correlated Response to Selection: Linkage and Initial Frequency Also Matter

Evolution ◽  
1997 ◽  
Vol 51 (5) ◽  
pp. 1394 ◽  
Author(s):  
Martin Lascoux
Keyword(s):  
Correlated Response ◽  
Response To Selection ◽  
Initial Frequency

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

Group feeding behavior of brown trout is a correlated response to selection for growth shaped by the environment

2007 ◽  
Vol 37 (3) ◽  
pp. 525-534 ◽  
Author(s):  
Thierry Boujard ◽  
Julien Ramezi ◽  
Marc Vandeputte ◽  
Laurent Labbé ◽  
Muriel Mambrini
Keyword(s):  
Feeding Behavior ◽  
Brown Trout ◽  
Correlated Response ◽  
Response To Selection ◽  
Group Feeding ◽  
Selection For

Corrigendum - Response to selection in Australian Merino sheep. I. Selection for high clean wool weight, with a ceiling on fibre diameter and degree of skin wrinkle. Response in wool and body characteristics

1968 ◽  
Vol 19 (1) ◽  
pp. 79
Author(s):  
HN Turner ◽  
CHS Dolling ◽  
JF Kennedy
Keyword(s):  
Fibre Diameter ◽  
The Other ◽  
Correlated Response ◽  
Mass Selection ◽  
Skin Area ◽  
Response To Selection ◽  
High Degree ◽  
Second Period ◽  
Final Selection ◽  
Staple Length

Direct and correlated responses are reported for two groups of sheep selected for high clean wool weight. The work covers two periods. In the first (1950–59), both groups had selection against high average fibre diameter and high degree of skin wrinkle, but in one group (S) the performance of the ram's half-sibs was considered as well as his own, while in the other (MS) mass selection was practiced for rams. For ewes, mass selection was practiced in both groups. In the second period (1961–64), mass selection was used for both sexes in both groups, with selection against high diameter and degree of wrinkle in one group (S), and against low crimp frequency and high degree of wrinkle in the other (MS). In both periods response to selection was assessed by comparison with a random control group. In the first period, response in clean wool weight was similar in S and MS, both for rams measured at 10–11 months, when a preliminary selection on them was carried out, and for ewes measured at 15–16 months, when final selection was made for both sexes. The annual rates of increase in clean wool weight for S and MS were 2.1 and 1.8% for rams and 2.4 and 2.7% for ewes, the lower rate in rams being due to the fact that response at 10–11 months is a correlated response to the final selection at 15–16 months. As the rates of increase in the two groups are similar, it can be concluded that examination of half-sibs is not worth while; this would in fact have been predicted from the high heritability estimates for clean wool weight. There were negligible trends in fibre diameter and wrinkle score, indicating that counter-selection has been effective in preventing an increase in these characteristics. Fibre number per unit skin area made the greatest contribution to the increases in clean wool weight, the annual rates of increase for S and MS being 2.0 and 2.2% for rams and 2.0 and I .8% for ewes. Greasy wool weight, percentage clean yield, body weight, and staple length also showed increases with increasing clean wool weight in both selected groups. In spite of the fact that fibre diameter did not increase, crimp number per unit of staple length decreased in both groups. This is a further confirmation of the strong negative genetic correlation between clean wool weight and crimp number, and of the lack of a strong association between crimp number and fibre diameter. In the second period, no further response was observed. It is impossible to say at this stage whether a selection plateau has been reached or whether drought conditions interfered with response.

Correlated response to selection of testosterone levels and immunocompetence in lines selected for avian personality

2011 ◽  
Vol 81 (5) ◽  
pp. 1055-1061 ◽  
Author(s):  
Kees van Oers ◽  
Katherine L. Buchanan ◽  
Tanja E. Thomas ◽  
Pieter J. Drent
Keyword(s):  
Correlated Response ◽  
Response To Selection ◽  
Testosterone Levels ◽  
Selection Of

scholarly journals Constraint, natural selection, and the evolution of human body form

2016 ◽  
Vol 113 (34) ◽  
pp. 9492-9497 ◽  
Author(s):  
Kristen R. R. Savell ◽  
Benjamin M. Auerbach ◽  
Charles C. Roseman
Keyword(s):  
Natural Selection ◽  
Quantitative Methods ◽  
Climatic Conditions ◽  
Directional Selection ◽  
Correlated Response ◽  
Specific Response ◽  
Response To Selection ◽  
Body Form ◽  
Individual Trait ◽  
Mean Differences

Variation in body form among human groups is structured by a blend of natural selection driven by local climatic conditions and random genetic drift. However, attempts to test ecogeographic hypotheses have not distinguished between adaptive traits (i.e., those that evolved as a result of selection) and those that evolved as a correlated response to selection on other traits (i.e., nonadaptive traits), complicating our understanding of the relationship between climate and morphological distinctions among populations. Here, we use evolutionary quantitative methods to test if traits previously identified as supporting ecogeographic hypotheses were actually adaptive by estimating the force of selection on individual traits needed to drive among-group differentiation. Our results show that not all associations between trait means and latitude were caused by selection acting directly on each individual trait. Although radial and tibial length and biiliac and femoral head breadth show signs of responses to directional selection matching ecogeographic hypotheses, the femur was subject to little or no directional selection despite having shorter values by latitude. Additionally, in contradiction to ecogeographic hypotheses, the humerus was under directional selection for longer values by latitude. Responses to directional selection in the tibia and radius induced a nonadaptive correlated response in the humerus that overwhelmed its own trait-specific response to selection. This result emphasizes that mean differences between groups are not good indicators of which traits are adaptations in the absence of information about covariation among characteristics.

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