• Publications
  • Influence
Animal signals
their prominence can be hard for even a casual observer to overlook. Animal signals therefore raise many scientific questions: What are their functions? What information do they transmit? How areExpand
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Models of reproductive skew: A review and synthesis (Invited Article)
Animal societies vary markedly in reproductive skew, the extent to which breeding is monopolised by dominant individuals. In the last few years, a large number of different models have been developedExpand
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  • R. Johnstone
  • Biology, Medicine
  • Biological reviews of the Cambridge Philosophical…
  • 1 February 1995
(i)  To find out whether a mating preference could have initially evolved for adaptive reasons, one must determine whether the preferred trait could have provided useful information about mateExpand
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Begging the question: are offspring solicitation behaviours signals of need?
Throughout the animal kingdom, distinctive behaviour by offspring commonly precedes and accompanies their provisioning by parents. Here, we assess empirical support for the recent theory that beggingExpand
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Multiple Displays in Animal Communication:`Backup Signals' and `Multiple Messages'
We propose a new game-theoretical model of signalling, in which signallers may use more than one display to advertise their qualities. Expand
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Sexual competition is associated closely with parental care because the sex providing less care has a higher potential rate of reproduction, and hence more to gain from competing for multiple mates.Expand
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The evolution of cooperative breeding through group augmentation
Some individuals (helpers) in cooperatively breeding species provide alloparental care and often suppress their own reproduction. Kin selection is clearly an important explanation for such behaviour,Expand
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Social Feedback and the Emergence of Leaders and Followers
In many animal groups, certain individuals consistently appear at the forefront of coordinated movements [1-4]. How such leaders emerge is poorly understood [5, 6]. Here, we show that in pairs ofExpand
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Negotiation over offspring care—how should parents respond to each other's efforts?
Models of biparental care predict that parents should compensate incompletely for any change in their partner's investment. Experimental tests have, however, yielded results that range from fullExpand
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Integrating cooperative breeding into theoretical concepts of cooperation
In cooperative breeding systems, some individuals help to raise offspring that are not their own. While early explanations for such altruistic behaviour were predominantly based on kin selection,Expand
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