Variation in generation time reveals density regulation as an important driver of pace of life in a bird metapopulation

• DOI: 10.1111/ele.13835
• Publication Date: 2021-07-27T01:05:22Z
• Authors: Yimen G. Araya‐Ajoy; Alina K. Niskanen; Hannah Froy; Peter Sjolte Ranke; Thomas Kvalnes; Bernt Rønning; Michael Le Pepke; Henrik Jensen; Thor Harald Ringsby; Bernt‐Erik Sæther; Jonathan Wright
• Keywords: Metapopulation; Generation time; Trait; Pace; Density dependence; Life History Theory

Abstract Generation time determines the pace of key demographic and evolutionary processes. Quantified as weighted mean age at reproduction, it can be studied a life‐history trait that varies within among populations may evolve in response to ecological conditions. We combined quantitative genetic analyses with age‐ density‐dependent models study generation variation bird metapopulation. was heritable, males had longer times than females. Individuals greater lifetime reproductive success but not higher expected population growth rate. Density regulation acted on recruit production, suggesting should favoured when are closer carrying capacity. Furthermore, were shorter growing equilibrium or declining. These results support classic theory predicting density is an important driver strategies.