Dataset

Data from: Provisioning tactics of great tits (Parus major) in response to long-term brood size manipulations differ across years

Mathot, K. J. (Creator), Olson, A. (Creator), Mutzel, A. (Creator), Araya-Ajoy, Y. G. (Creator), Nicolaus, M. (Creator), Westneat, D. F. (Creator), Wright, J. (Creator), Kempenaers, B. (Creator), Dingemanse, N. (Creator), University of Groningen, 11-May-2017

Dataset

  • Kimberley J. Mathot (Creator)
  • Anne-Lise Olson (Creator)
  • Ariane Mutzel (Creator)
  • Yimen G. Araya-Ajoy (Creator)
  • Marion Nicolaus (Creator)
  • David F. Westneat (Creator)
  • Jonathan Wright (Creator)
  • Bart Kempenaers (Creator)
  • Niels Dingemanse Research Group Evolutionary Ecology, Max Planck Institute for Ornithology, Eberhard Gwinner Strasse, 82319 Seewiesen, Germany (Creator)
  • Research Group Evolutionary Ecology, Max Planck Institute for Ornithology, Eberhard Gwinner Strasse, 82319 Seewiesen, Germany

Description

Parents provisioning their offspring can adopt different tactics to meet increases in offspring demand. In this study, we experimentally manipulated brood demand in free living great tits (Parus major) via brood size manipulations and compared the tactics adopted by parents in 2 successive years (2010 and 2011) with very different ecological conditions. In 2011, temperatures were warmer, there were fewer days with precipitation, and caterpillars (the preferred prey of great tits) made up a significantly larger proportion of the diet. In this “good” year, parents responded to experimental increases in brood demand by decreasing mean inter-visit intervals (IVIs) and reducing prey selectivity, which produced equal average long-term delivery of food to nestlings across the brood size treatments. In 2010, there was no evidence for effects of brood size manipulations on mean IVIs or prey selectivity. Consequently, nestlings from enlarged broods experienced significantly lower long-term average delivery rates compared with nestlings from reduced broods. In this “bad” year, parents also exhibited changes in the variance in inter-visit intervals (IVIs) as a function of treatment that were consistent with variance-sensitive foraging theory: variance in IVIs tended to be lowest for reduced broods and highest for enlarged broods. Importantly, this pattern differed significantly from that observed in the “good” year. We therefore found some support for variance-sensitive provisioning in the year with more challenging ecological conditions. Taken together, our results show that variation in brood demand can result in markedly different parental foraging tactics depending on ecological conditions.
Date made available11-May-2017
PublisherUniversity of Groningen
Geographical coverageBavaria, Germany
Access to the dataset Open
Contact researchdata@rug.nl

    Keywords on Datasets

  • brood demand, brood size manipulation, heterogeneous residual variance, provisioning behaviour, variance-sensitivity, Parus major
Related Publications
  1. Provisioning tactics of great tits (Parus major) in response to long-term brood size manipulations differ across years

    Mathot, K. J., Olson, A-L., Mutzel, A., Araya-Ajoy, Y. G., Nicolaus, M., Westneat, D. F., Wright, J., Kempenaers, B. & Dingemanse, N. J., 13-Nov-2017, In : Behavioral Ecology. 28, 6

    Research output: Contribution to journalArticleAcademicpeer-review

View all (1) »

ID: 71850277