Reproductive effort and future parental competitive ability: A nest box removal experiment

Rienk W. Fokkema*, Richard Ubels, Christiaan Both, Livia de Felici, Joost M. Tinbergen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
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Abstract

The life history trade-off between current and future reproduction is a theoretically well-established concept. However, empirical evidence for the occurrence of a fitness cost of reproduction is mixed. Evidence indicates that parents only pay a cost of reproduction when local competition is high. In line with this, recent experimental work on a small passerine bird, the Great tit (Parus major) showed that reproductive effort negatively affected the competitive ability of parents, estimated through competition for high quality breeding sites in spring. In the current study, we further investigate the negative causal relationship between reproductive effort and future parental competitive ability, with the aim to quantify the consequences for parental fitness, when breeding sites are scarce. To this end, we (a) manipulated the family size of Great tit parents and (b) induced severe competition for nest boxes among the parents just before the following breeding season by means of a large-scale nest box removal experiment. Parents increased their feeding effort in response to our family size manipulation and we successfully induced competition among the parents the following spring. Against our expectation, we found no effect of last season's family size on the ability of parents to secure a scarce nest box for breeding. In previous years, if detected, the survival cost of reproduction was always paid after midwinter. In this year, parents did pay a survival cost of reproduction before midwinter and thus before the onset of the experiment in early spring. Winter food availability during our study year was exceptionally low, and thus, competition in early winter may have been extraordinarily high. We hypothesize that differences in parental competitive ability due to their previous reproductive effort might have played a role, but before the onset of our experiment and resulted in the payment of the survival cost of reproduction.

Original languageEnglish
Pages (from-to)8865-8879
Number of pages15
JournalEcology and Evolution
Volume8
Issue number17
DOIs
Publication statusPublished - Sep-2018

Keywords

  • brood size manipulation
  • carry-over effects
  • intraspecific competition
  • life history theory
  • social environment
  • TIT PARUS-MAJOR
  • GATHERING PUBLIC INFORMATION
  • BREEDING HABITAT SELECTION
  • BROOD SIZE MANIPULATION
  • MALE EASTERN BLUEBIRDS
  • OPTIMAL CLUTCH SIZE
  • HISTORY TRADE-OFFS
  • GREAT TIT
  • TERMINAL INVESTMENT
  • DENSITY-DEPENDENCE

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