Data from: Subtle but ubiquitous selection on body size in a natural population of collared flycatchers over 33 years

Mats Björklund & Lars Gustafsson
Understanding the magnitude and long-term patterns of selection in natural populations is of importance, for example, when analyzing the evolutionary impact of climate change. We estimated univariate and multivariate directional, quadratic and correlational selection on four morphological traits (adult wing, tarsus and tail length, body mass) over a time period of 33 years (≈ 19 000 observations) in a nest-box breeding population of collared flycatchers (Ficedula albicollis). In general, selection was weak in both males...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?