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. 2019 Sep 3;9(18):10085-10091.
doi: 10.1002/ece3.5367. eCollection 2019 Sep.

Parental genetic similarity and offspring performance in blue tits in relation to brood size manipulation

Aneta Arct  1 , Szymon M Drobniak  1 , Samantha Mellinger  1 , Lars Gustafsson  2 , Mariusz Cichoń  1
Affiliations

Parental genetic similarity and offspring performance in blue tits in relation to brood size manipulation

Aneta Arct et al. Ecol Evol. .

Abstract

In birds, as in many other taxa, higher genetic similarity of mates has long been known to reduce offspring fitness. To date, the majority of avian studies have focused on examination whether the genetic similarity of social mates predicts hatching success. Yet, increased genetic similarity of mates may also reduce offspring fitness during later life stages, including the nestling period and beyond. Here, we investigated whether parental genetic similarity influences offspring performance using data from free-living blue tits (Cyanistes caeruleus) collected across three breeding seasons. Additionally, we tested whether brood size manipulation affects the magnitude and direction of the relationship between genetic similarity of mates and offspring performance. Sixteen microsatellite markers were used to measure genetic similarity between biological parents. We found that the genetic similarity of parents negatively affects offspring immune response and this effect was independent of the experimental brood size manipulation.

Keywords: birds; brood size manipulation; immune response; inbreeding; mate choice; microsatellite; passerine; relatedness.

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Conflict of interest statement

None declared.

Figures

Figure 1
Figure 1
Nestling T‐cell‐mediated immune response to PHA in relation to parental genetic similarity. The graph shows the best‐fit regression line for the mean of the width variable. See the Methods section for details on statistics
See this image and copyright information in PMC

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