Viability selection creates negative heterozygosity-fitness correlations in female Black Grouse Lyrurus tetrix
Soulsbury, C., & Lebigre, C. (2018). Viability selection creates negative heterozygosity-fitness correlations in female Black Grouse Lyrurus tetrix. Journal of Ornithology, 159(1), 93-101. https://doi.org/10.1007/s10336-017-1474-3
Julkaistu sarjassa
Journal of OrnithologyPäivämäärä
2018Oppiaine
Ekologia ja evoluutiobiologiaBiologisten vuorovaikutusten huippututkimusyksikköEcology and Evolutionary BiologyCentre of Excellence in Biological Interactions ResearchTekijänoikeudet
© The Author(s) 2017. This is an open access article distributed under the terms of the Creative Commons License.
There is widespread interest in the relationship
between individual genetic diversity and fitness–related
traits (heterozygosity–fitness correlations; HFCs). Most
studies have found weak continuous increases of fitness
with increasing heterozygosity, while negative HFCs have
rarely been reported. Negative HFCs are expected in cases
of outbreeding depression, but outbreeding is rare in natural
populations. Negative HFCs may also arise through
viability selection acting on low heterozygosity individuals
at an early stage producing a skew in the heterozygosity
distribution. We tested this idea using survival and clutch
parameters (egg mass, egg volume, chick mass, clutch size)
in female Black Grouse Lyrurus tetrix and carried out
simulations to determine how survival selection may
impact the HFCs measured using clutch parameters. We
show that survival is positively related to both individual
heterozygosity and female body mass. There was a positive
effect of body mass on all clutch parameters, but the
selective mortality of females with both low heterozygosity
and low body mass led to overrepresentation of high
heterozygosity-low body mass females and hence a negative
relationship between egg volume and heterozygosity.
Using simulated data, we show that survival selection
acting on both low body mass and low heterozygosity leads
to a skew in the quality of breeding females, resulting in
negative HFCs with egg volume. Our results indicate that
survival selection can strongly influence the strength and
direction of any HFCs that occur later in life and that only
an integration of all aspects of individual reproductive
investment and reproductive success can enable us to fully
understand how heterozygosity can shape individual
fitness.
...
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