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dc.contributor.author Kloskowski, Janusz
dc.date.accessioned 2019-01-10T20:11:22Z
dc.date.available 2019-01-10T20:11:22Z
dc.date.issued 2019-01-10
dc.identifier doi:10.5061/dryad.6k417tm
dc.identifier.uri http://hdl.handle.net/10255/dryad.203742
dc.description Selective elimination of excess offspring with poor fitness prospects may occur prenatally (selective abortion) or postnatally (brood reduction). Postnatal reduction is the dominant strategy, presumably because surplus progeny serves as a hedge against environmental and developmental uncertainty. In birds, its main proximate mechanism is asynchronous hatching, generating within-brood competitive asymmetry. Here, clutch-size reduction via last-egg abandonment was investigated in the asynchronously hatching red-necked grebe in a study area comprising two human-managed poorly predictable habitats with distinctly different food supplies. Last-egg abandonment, virtually absent in favorable food conditions, occurred regularly in larger clutches in conditions of brood-stage food scarcity. In the food-poor habitat, the production and body condition of fledglings did not differ between last-egg abandoning and caring pairs. The experimentally prolonged hatching interval increased the egg abandonment rate (irrespective of clutch size), but mainly in food-poor conditions. This is the first demonstration of parental clutch reduction in anticipation of brood-stage food limitation. Last-egg abandonment functions as an equivalent of abortion, as discarded offspring are excluded from the postnatal selection arena. This strategy might have evolved as ‘best-of-a-bad-job’ to reallocate parental resources when a strong mismatch between clutch size and chick survival probability reduced the hedging value of later-laid eggs.
dc.relation.haspart doi:10.5061/dryad.6k417tm/1
dc.subject brood reduction
dc.subject family planning
dc.subject hatching asynchrony
dc.subject infanticide
dc.subject offspring survival
dc.title Data from: An avian equivalent of selective abortion: post-laying clutch reduction under resource limitation
dc.type Article *
dwc.ScientificName Podiceps grisegena
dc.contributor.correspondingAuthor Kloskowski, Janusz
prism.publicationName Behavioral Ecology

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Title Post-laying clutch reduction Dryad Dataset
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Description The attached Excel file provides data for "An avian equivalent of selective abortion: post-laying clutch reduction under resource limitation". The first sheet contains data on the natural occurrence of last-egg abandonment under high and low food conditions in red-necked grebes. The second sheet contains data on the occurrence of prolonged incubation. The third sheet contains data used for calculation of the scaled mass index in juvenile birds. The scaled mass index (SMI) was computed using the equation of Peig & Green (2009). The fourth sheet contains data on the effect of experimentally increased hatching asynchrony on last-egg abandonment rates.
Download Post-laying clutch reduction Dryad Dataset.xls (71.68 Kb)
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