Data from: Brood size, telomere length, and parent-offspring color signaling in barn swallows

Alessandra Costanzo, Marco Parolini, Gaia Bazzi, Lela Khoriauli, Marco Santagostino, Cristina D. Possenti, Andrea Romano, Solomon G. Nergadze, Diego Rubolini, Elena Giulotto & Nicola Saino
Trade-offs select for optimal allocation of resources among competing functions. Parents are selected to maximize production of viable offspring by balancing between progeny number and “quality.” Telomeres are nucleoproteins, at the ends of eukaryotic chromosomes, that shorten when cells divide. Because shortening below a certain threshold depresses organismal functioning and rate of shortening depends on environmental conditions, telomeres are good candidates as mediators of trade-offs. We altered brood size of barn swallow Hirundo rustica and...
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