Patterns of natural selection on morphology of male and female collared flycatchers (Ficedula albicollis)

Przybylo, Robert

doi:10.1006/bijl.1999.0353

Cited by 15 publications

(22 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This variation could conceivably reflect the stochastic nature of selection, which is unlikely to be constant in space or time (e.g. Blanckenhorn et al, 1999;Jann et al, 2000;Przybylo et al, 2000;Kinnison & Hendry, 2001), although a temporal analysis of our selection estimates does not support this idea. Thus, although recent studies suggest that bursts of strong directional selection are often separated by periods of reversal or stasis Grant & Grant, 2002), it remains to be seen whether year-to-year variability in selection is the rule rather than the exception.…”

Section: General Patternsmentioning

confidence: 87%

When bigger is not better: selection against large size, high condition and fast growth in juvenile lemon sharks

DiBattista

Feldheim

Gruber

et al. 2006

J of Evolutionary Biology

100

159

View full text Add to dashboard Cite

Selection acting on large marine vertebrates may be qualitatively different from that acting on terrestrial or freshwater organisms, but logistical constraints have thus far precluded selection estimates for the former. We overcame these constraints by exhaustively sampling and repeatedly recapturing individuals in six cohorts of juvenile lemon sharks (450 age‐0 and 255 age‐1 fish) at an enclosed nursery site (Bimini, Bahamas). Data on individual size, condition factor, growth rate and inter‐annual survival were used to test the ‘bigger is better’, ‘fatter is better’ and ‘faster is better’ hypotheses of life‐history theory. For age‐0 sharks, selection on all measured traits was weak, and generally acted against large size and high condition. For age‐1 sharks, selection was much stronger, and consistently acted against large size and fast growth. These results suggest that selective pressures at Bimini may be constraining the evolution of large size and fast growth, an observation that fits well with the observed small size and low growth rate of juveniles at this site. Our results support those of some other recent studies in suggesting that bigger/fatter/faster is not always better, and may often be worse.

show abstract

Section: General Patternsmentioning

confidence: 87%

When bigger is not better: selection against large size, high condition and fast growth in juvenile lemon sharks

DiBattista

Feldheim

Gruber

et al. 2006

J of Evolutionary Biology

100

159

View full text Add to dashboard Cite

show abstract

“…Low levels of directional selection on morphological traits are commonly observed in passerines both via fecundity and survival (e.g. Björklund and Lindén 1993, Schluter and Smith 1986b, Wiggins 1991, Przybylo et al 2000 with the exception for Darwin's finches of the Galapagos Islands (Grant and Grant 1989). However, note that the selection analyses in this study of great reed warblers do not include the first year life stage, which due to the high mortality may be a period when selection pressures on quantitative characters are rather strong (e.g.…”

Section: Selectionmentioning

confidence: 92%

Genetic and phenotypic associations in morphological traits: a long term study of great reed warblers Acrocephalus arundinaceus

Åkesson¹,

Bensch²,

Hasselquist³

2007

J Avian Biology

View full text Add to dashboard Cite

We present estimates of standardized selection (directional and quadratic) differentials via reproductive success on eight morphological traits in a newly founded long-term study population of great reed warblers Acrocephalus arundinaceus in Sweden. In order to predict the evolutionary response to selection in these traits we present estimates of heritabilities (h 2 ), phenotypic (r P ) and genetic (r A ) correlations among the same traits. We also examined the extent of parental effects in the expression of the phenotypic traits. Overall, the population is subject to low levels of directional selection and higher levels of stabilizing selection. This makes us predict that the population is changing very little if anything, even though h 2 in many cases are considerable. Midparentmidoffspring h 2 ranged from 0.14 and 0.94 (mean 0.58) and were significant for seven of eight traits. We found indications of positive maternal effects in tarsus length. Phenotypic correlations between traits ranged from 0.02 to 0.43 (mean 0.15) and showed generally much lower values than the corresponding genetic correlations that ranged between 0.08 and 1.04 (mean 0.46). Overall, the correlation between r P and r A was significant, although moderate, but they tended to differ in magnitude, possibly due to overestimation of additive covariance between traits.

show abstract

“…These included the survival probabilities during three life stages, five morphological and one immunological trait of nestlings that predict post-fledging survival Merilä et al 2001;Moreno et al 2005). We also compared the morphology of recruits to test whether the potential differences between within-pair and extra-pair nestlings persist until adulthood, although these adult traits are generally under weak selection (Przybylo et al 2000). Furthermore, we tested the difference in three life history traits (egg size, clutch size and laying date) that affect reproductive success (e.g.…”

Section: Statistical Analysesmentioning

confidence: 99%

Superiority of extra-pair offspring: maternal but not genetic effects as revealed by a mixed cross-fostering design

Krist

Munclinger

2011

Molecular Ecology

View full text Add to dashboard Cite

Extra-pair copulations (EPC) are the rule rather than an exception in socially monogamous birds, but despite widespread occurrences, the benefits of female infidelity remain elusive. Most attention has been paid to the possibility that females gain genetic benefits from EPC, and fitness comparisons between maternal half-siblings are considered to be a defining test of this hypothesis. Recently, it was shown that these comparisons may be confounded by within-brood maternal effects where one such effect may be the distribution of half-siblings in the laying order. However, this possibility is difficult to study as it would be necessary to detect the egg from which each chick hatched. In this study, we used a new approach for egg-chick assignment and cross-fostered eggs on an individual basis among a set of nests of the collared flycatcher Ficedula albicollis. After hatching, chicks were ascribed to mothers and therefore to individual eggs by molecular genetic methods. Extra-pair young predominated early in the laying order. Under natural conditions, this should give them a competitive advantage over their half-siblings, mediated by hatching asynchrony. However, we experimentally synchronized hatching, and after this treatment, extra-pair young did not outperform within-pair young in any studied trait including survival up to recruitment and several indicators of reproductive success and attractiveness. We obtained only modest sample sizes for the last two traits and did not test for extra-pair success of male offspring. Thus, we cannot exclude the possibility of advantages of extra-pair young during the adult phase of life. However, our data tentatively suggest that the more likely reason for females' EPCs is the insurance against the infertility of a social mate.

show abstract

Patterns of natural selection on morphology of male and female collared flycatchers (Ficedula albicollis)

Cited by 15 publications

References 0 publications

When bigger is not better: selection against large size, high condition and fast growth in juvenile lemon sharks

When bigger is not better: selection against large size, high condition and fast growth in juvenile lemon sharks

Genetic and phenotypic associations in morphological traits: a long term study of great reed warblers Acrocephalus arundinaceus

Superiority of extra-pair offspring: maternal but not genetic effects as revealed by a mixed cross-fostering design

Contact Info

Product

Resources

About