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Samenvatting
How parents negotiate over parental care is a central issue in evolutionary biology because it affects the evolutionary outcome of sexual conflict. A recent theoretical model shows that ‘turn-taking’ in provisioning visits by the parents is an evolutionarily stable negotiation strategy, and empirical studies have shown that parental nest-visits do indeed alternate more than expected by chance. However, such alternation may also be generated by a refractory period, or by correlated temporal heterogeneity (CTH) in provisioning rates of the two parents driven by temporal environmental variation. Here we use a recently developed measure of alternation and a novel measure of CTH in the provisioning rates of pairs to clarify what can be concluded about the occurrence of turn-taking from the provisioning patterns of pairs. First, we show using a simulation model that turn-taking can, by itself, generate both a refractory period and CTH in provisioning rates. Second, we incorporate this insight into a conceptual framework that combines an existing randomization analysis with a novel analytical approach in which ‘pseudo-pairs’ are created by analytically pairing the provisioning sequence of a parent at one nest with the contemporaneous provisioning sequence of the other-sex parent at a nearby nest. This allows us to partition the alternation score into different components. This approach confirms that isolating a component of alternation that can be unequivocally attributed to turn-taking is probably impossible. However, the pseudo-pairs analysis does isolate a component that can be unequivocally attributed to general temporal environmental variation (environmental variation that causes CTH in provisioning rates across [as well as within] pairs). Third, we use these techniques to partition the alternation score of 17 pairs of great tits Parus major provisioning in the wild. Approximately 8% of the observed alternation score is due to the frequency distribution of the inter-visit intervals, 74% to nest-specific effects on the sequence of inter-visit intervals, and 18% to general effects on the sequence of inter-visit intervals. This last component can be unequivocally attributed to general temporal environmental variation, and is the first empirical demonstration of alternation by free-living provisioning parents being generated by temporal environmental variation.
Originele taal-2 | Engels |
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Artikelnummer | 448 |
Tijdschrift | Frontiers in Ecology and Evolution |
Volume | 7 |
Vroegere onlinedatum | 2019 |
DOI's | |
Status | Gepubliceerd - 2019 |
Vingerafdruk
Duik in de onderzoeksthema's van 'Turn-taking between provisioning parents: partitioning alternation'. Samen vormen ze een unieke vingerafdruk.Projecten
- 1 Afgelopen
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NWO - Negotiating over parental care: how do parents react to each other?
Lessells, K. (PI) & Baldan, D. (Collaborator)
15/02/2014 → 14/05/2018
Project: Onderzoek
Datasets
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Data from: Turn-taking between provisioning parents: partitioning alternation
Baldan, D. (Maker), Hinde, C. A. (Maker) & Lessells, C. M. (Maker), Marine Data Archive, 11 jun. 2019
http://mda.vliz.be/directlink.php?fid=VLIZ_00000444_5cffb3c989512
Dataset