Data from: Ecological causes of multi-level covariance between size and first-year survival in a wild bird population

Sandra Bouwhuis, Oscar Vedder, Colin J. Garroway & Ben C. Sheldon
1. Estimates of selection in natural populations are frequent but our understanding of ecological causes of selection, and causes of variation in the direction, strength and form of selection, is limited. 2. Here, we apply a multi-level framework to partition effects of great tit fledging mass on first-year survival to hierarchical levels and quantify their ecological dependence using a data set spanning 51 years. 3. We show that estimates of the effect of fledging mass...
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