DOI: 10.5061/dryad.7d7wm3806
title: Data from: Reproductive senescence and mating tactic interact and conflict to drive reproductive success in a passerine

description: An understanding of the drivers of individual fitness is a fundamental
 component of evolutionary ecology and life-history theory. Reproductive
 senescence, mate and mating tactic choice, and latent heterogeneity in
 individual quality interact to affect individual fitness. We sought to
 disentangle the effects of these fitness drivers, where longitudinal data
 are required to understand their respective impacts. We used reproductive
 allocation and success data from a long-term (1989-2018) study of
 white-throated dippers (Cinclus cinclus) in Switzerland to simultaneously
 examine the effects of female and male age, mating tactic, nest initiation
 date, and individual heterogeneity on reproductive performance. We modeled
 quadratic and categorical effects of age on reproductive parameters. The
 probability of polygyny increased with age in both sexes before declining
 in older age classes. Similarly, hatching probability in monogamous pairs
 and the number of nestlings hatched in both monogamous and polygynous
 pairs increased with female age before declining later in life. As
 predicted, offspring survival in monogamous pairs increased with male age
 before declining in older age classes, but male age had no effect on
 offspring survival in polygynous nesting attempts. Our results demonstrate
 that parental age, mating tactic, and individual heterogeneity all affect
 reproductive success, and that the impacts of senescent decline are
 expressed across different demographic components as a function of
 sex-specific senescent decline and mating tactic.
description: Demographic research on dippers was conducted at three small to
 medium-sized drainages (Ku¨snacht, Sihl, and Wehrenbach) near the city of
 Zurich, Switzerland. For 30 years (1989-2018) breeding dippers (30-70
 pairs/yr) were marked with metal rings and plastic color markers and
 associated with nests through resighting of marked individuals and their
 behavior. Nests were located by carefully searching streams flowing into
 the northern portion of Lake Zurich from February to June. The mating
 tactic for each nest was determined through observation of male and female
 behavior. Previous research has demonstrated low extra-pair paternity in
 this (&lt;0.01; Becker et al. 2015) and other (&lt;0.02; Øigarden
 et al. 2010) dipper populations. Reproductive attempts were monitored to
 cessation, and observers recorded whether or not a nest hatched offspring
 (γ) and the number of hatchlings from each nest conditional on success
 (ξ). Nestlings were also marked with metal rings and plastic color markers
 prior to fledging at seven to 14 days of age. In the majority of years,
 all fledged offspring were marked across the three drainages. Offspring
 were monitored and reencountered as philopatric sub-adults and adults,
 allowing for the estimation of local recruitment probability (ψ). See
 Hegelbach (2001, 2004) and Becker et al. (2015) for further details
 regarding data collection.
description: Required tools: R, JAGS, jagsUI