Parental genetic similarity and offspring performance in blue tits in relation to brood size manipulation. Issue 18 (3rd September 2019)

• Record Type: Journal Article
• Authors: Arct, Aneta; Drobniak, Szymon M.; Mellinger, Samantha; Gustafsson, Lars; Cichoń, Mariusz
• Is Part Of: Ecology and evolution. Volume 9:Issue 18(2019)
• Page Start: 10085
• Page End: 10091
• Publication Date: 2019-09-03
• Subjects: birds -- brood size manipulation -- immune response -- inbreeding -- mate choice -- microsatellite -- passerine -- relatedness; Ecology -- Periodicals; Evolution -- Periodicals; 577.05
• DOI: 10.1002/ece3.5367
• Languages: English
• ISSNs: 2045-7758

Abstract

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. Abstract : This is one of a few studies on natural populations of birds showing negative effects of parental genetic similarity on offspring performance. Specifically, we found that a higher genetic similarity of parents negatively affects offspring immune response to a novel antigen—phytohaemagglutinin.