Social selection analysis reveals limited effect of neighbors’ traits in Tree swallows

Social interactions are ubiquitous in nature and can shape fitness of individuals through social selection. This type of selection arises when phenotypes of neighbors influence the fitness of a focal individual. Quantifying social selection is crucial to better characterise the overall selective landscape. For example, if intraspecific competition is strong, traits that are beneficial for an individual could be detrimental for competitors. In this study, we quantified social selection acting on four key ecological traits (body mass, wing length, laying date and clutch size) in wild Tree swallow (Tachycineta bicolor) females. We used reproductive success measured at three stages throughout the breeding season as fitness proxies to assess selection acting at those decisive moments. We also quantified the effects of environment on selection using measures of conspecifics’ density, type of agricultural landscape and presence of interspecific competitors. Overall, we found no strong evidence..., See Methods section in the manuscript for additional information., , # Social selection analysis reveals limited effect of neighbors’ traits in Tree swallows

[https://doi.org/10.5061/dryad.sn02v6xd2](https://doi.org/10.5061/dryad.sn02v6xd2)

## Description of the data and file structure

Column names and description (data file)

annee : year

ferme : farm

foc_nichoir : nestbox focal

foc : focal #

foc_idadult : focal id

foc_age : focal age

foc_sex : focal sex

foc_dponte : focal laying date (Julian day)

foc_noeufs : focal clutch size

foc_noisnes : focal nb hatchlings

foc_noisenvol : focal nb fledglings

foc_moylaile : focal wing length (mm)

foc_moymasse : focal body mass (adjusted)

cultperenne : extensive cultures proportion

moin : House sparrows (presence or absence)

nich_occ : Density of conspecifics (nb occupied nest boxes)

soc_dponte : social mean laying date

soc_aile : social mean wing length

soc_moymasse : social mean body mass (adjusted)