On the moulding of population viscosity by natural selection

Gadgil, Madhav ; Joshi, N. V. ; Gadgil, Sulochana (1983) On the moulding of population viscosity by natural selection Journal of Theoretical Biology, 104 (1). pp. 21-42. ISSN 0022-5193

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002251...

Related URL: http://dx.doi.org/10.1016/0022-5193(83)90399-5


In this paper, we explore the conjoint evolution of dispersal and social behaviour. The model investigated is of a population distributed over a number of sites each with a carrying capacity of two adults and an episode of dispersal in the juvenile stage. The fertilities are governed by whether an individual and its neighbour are selfish or co-operative. It is shown that the best dispersal strategy for the co-operative genotype always involves lower levels of dispersal; and further that ecological conditions favouring low levels of dispersal increase the selective advantage of a co-operative genotype. Given this positive feedback, we suggest that in any taxon viscosity and co-operativity will tend to be correlated and bimodally distributed. Hence we predict the existence of two kinds of animal societies; viscous and co-operative (e.g. quasi-social wasps such as Mischocyttarus), and non-viscous and selfish (e.g. communal sphecid wasps such as Cerceris), and relatively few social groups with intermediate levels of co-operativity and viscosity. We also suggest that when one of the two sexes disperses, it will be the sex with lower potential for co-operative behaviour.

Item Type:Article
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ID Code:15921
Deposited On:16 Nov 2010 13:43
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