Abstract:Successfully predicting adaptive phenotypic responses to environmental changes, and predicting resulting population outcomes, requires that additive genetic (co)variances underlying microevolutionary and plastic responses of key traits are adequately estimated on appropriate quantitative scales. Such estimation in turn requires that focal traits, and their underlying quantitative genetic architectures, are appropriately conceptualized. Here, we highlight that directly analyzing observed phenotypes as continuou… Show more
“…[However, see (44) for details on the concept of lay date as threshold trait.] Albeit we do not find any clear indication for environmental constraints on early lay dates, we cannot exclude their presence.…”
Section: Discussionmentioning
confidence: 99%
“…Moreover, although early selection line females were selected for GEBVs for extremely early lay dates, it is possible that environmental variables (e.g., ambient temperature) set some kind of a hard threshold for the earliest lay dates ( 43 ). [However, see ( 44 ) for details on the concept of lay date as threshold trait.] Albeit we do not find any clear indication for environmental constraints on early lay dates, we cannot exclude their presence.…”
Global warming has shifted phenological traits in many species, but whether species are able to track further increasing temperatures depends on the fitness consequences of additional shifts in phenological traits. To test this, we measured phenology and fitness of great tits (
Parus major
) with genotypes for extremely early and late egg lay dates, obtained from a genomic selection experiment. Females with early genotypes advanced lay dates relative to females with late genotypes, but not relative to nonselected females. Females with early and late genotypes did not differ in the number of fledglings produced, in line with the weak effect of lay date on the number of fledglings produced by nonselected females in the years of the experiment. Our study is the first application of genomic selection in the wild and led to an asymmetric phenotypic response that indicates the presence of constraints toward early, but not late, lay dates.
“…[However, see (44) for details on the concept of lay date as threshold trait.] Albeit we do not find any clear indication for environmental constraints on early lay dates, we cannot exclude their presence.…”
Section: Discussionmentioning
confidence: 99%
“…Moreover, although early selection line females were selected for GEBVs for extremely early lay dates, it is possible that environmental variables (e.g., ambient temperature) set some kind of a hard threshold for the earliest lay dates ( 43 ). [However, see ( 44 ) for details on the concept of lay date as threshold trait.] Albeit we do not find any clear indication for environmental constraints on early lay dates, we cannot exclude their presence.…”
Global warming has shifted phenological traits in many species, but whether species are able to track further increasing temperatures depends on the fitness consequences of additional shifts in phenological traits. To test this, we measured phenology and fitness of great tits (
Parus major
) with genotypes for extremely early and late egg lay dates, obtained from a genomic selection experiment. Females with early genotypes advanced lay dates relative to females with late genotypes, but not relative to nonselected females. Females with early and late genotypes did not differ in the number of fledglings produced, in line with the weak effect of lay date on the number of fledglings produced by nonselected females in the years of the experiment. Our study is the first application of genomic selection in the wild and led to an asymmetric phenotypic response that indicates the presence of constraints toward early, but not late, lay dates.
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