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Models for clutch size and sex ratio with sibling interaction

Affiliation:	1. Department of Biology, The University of Western Ontario, London, ON N6A 5B7, Canada;2. Department of Environmental and Biological Sciences, The University of Eastern Finland, P.O. Box 111, FI-80101 Joensuu, Finland;1. UMR CNRS 6282 Biogéosciences, Université Bourgogne Franche-Comté, 6 Boulevard Gabriel, 21000 Dijon, France;2. M2i Biocontrol, Caunezil, 46140 Parnac, France;3. UMR INRAe 1065 Santé et Agroécologie du Vignoble, Institut des Sciences de la Vigne et du Vin, 71 Avenue Edouard Bourlaux, 33882 Villenave-d’Ornon, France;4. UMR 7372 Centre d’Etudes Biologiques de Chizé, CNRS & La Rochelle Université, 79360 Villiers-en-Bois, France;1. Laboratorio de Agrostología, Instituto de Investigación en Ganadería y Biotecnología, Facultad de Ingeniería Zootecnista, Agronegocios y Biotecnología, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas, Chachapoyas, 01001, Peru;2. Instituto de Investigación para El Desarrollo Sustentable de Ceja de Selva, Universidad Nacional Toribio Rodríguez de Mendoza, Chachapoyas, 01001, Peru;1. Research Federation Agrobiosciences, Interactions and Biodiversity, Toulouse, France;2. Centre for Archaeological Science, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, New South Wales 2522, Australia;3. Department of Paleontology, San Diego Natural History Museum, San Diego, CA, USA

Abstract:	General models are constructed to predict sex ratio and clutch size simultaneously for those organisms in which members of a clutch interact to affect each other's fitness. The same set of underlying factors can be shown to predict both optimal sex ratios and clutch sizes. The presence or absence of these factors enables different life histories or models to be classified. Previous sibling interaction sex ratio and clutch size models are special cases of the general model. The circumstances in which it is wrong to consider clutch size and sex ratio in isolation are identified. A distinction is made between those models that maximise sex ratio or clutch size with respect to a single clutch and those that consider either several clutches or lifetime fitness.

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