Multigenerational fitness outcomes of double-brooding: a 30-year study of a migratory songbird.

ABSTRACT: In birds, rearing multiple broods per season can substantially increase the annual number of fledglings produced. However, the contribution of double-brooding to lifetime fitness is unclear because the number of recruits arising from single- and double-brooded females is rarely measured. Poor estimates of fitness also make it challenging to document potential trade-offs between double-brooding and survival or future reproductive output. To understand the contribution of double-brooding to lifetime fitness and whether double-brooding was associated with life-history trade-offs, we used 30 years of reproductive data on female Savannah sparrows (Passerculus sandwichensis) breeding on Kent Island, New Brunswick. Estimates of fitness included an analysis of recruitment of both F1 (first

SUBMITTER: Spina HA 

PROVIDER: S-EPMC12137901 | biostudies-literature | 2025 Jul-Aug

REPOSITORIES: biostudies-literature