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- Publications
- Influence
The costs of keeping cool in a warming world: implications of high temperatures for foraging, thermoregulation and body condition of an arid-zone bird.
- Katherine L du Plessis, R. Martin, P. Hockey, S. Cunningham, A. Ridley
- Biology, Medicine
- Global change biology
- 1 October 2012
Recent mass mortalities of bats, birds and even humans highlight the substantial threats that rising global temperatures pose for endotherms. Although less dramatic, sublethal fitness costs of high… Expand
Cognitive performance is linked to group size and affects fitness in Australian magpies
- Benjamin J Ashton, A. Ridley, Emily K. Edwards, A. Thornton
- Psychology, Medicine
- Nature
- 22 January 2018
The social intelligence hypothesis states that the demands of social life drive cognitive evolution. This idea receives support from comparative studies that link variation in group size or mating… Expand
Synchronous provisioning increases brood survival in cooperatively breeding pied babblers.
- N. Raihani, Martha J Nelson-Flower, K. Moyes, L. E. Browning, A. Ridley
- Biology, Medicine
- The Journal of animal ecology
- 2010
1. Behavioural synchrony typically involves trade-offs. In the context of foraging, for example, synchrony may be suboptimal when individuals have different energy requirements but yield net benefits… Expand
Interrogating recent range changes in South African birds: confounding signals from land use and climate change present a challenge for attribution
- P. Hockey, Clélia Sirami, A. Ridley, G. Midgley, H. Babiker
- Geography
- 1 March 2011
Aim Apparent anthropogenic warming has been underway in South Africa for several decades, a period over which significant range shifts have been observed in some indigenous bird species. We asked… Expand
Facultative response to a kleptoparasite by the cooperatively breeding pied babbler
- A. Ridley, N. Raihani
- Biology
- 1 March 2007
In many cases of interspecific kleptoparasitism, hosts develop defensive behaviors to minimize the impact of kleptoparasites. Because vigilance and defensive behaviors are often costly, selection… Expand
The value of constant surveillance in a risky environment
- M. Bell, A. N. Radford, R. Rose, H. Wade, A. Ridley
- Psychology, Medicine
- Proceedings of the Royal Society B: Biological…
- 22 August 2009
In risky environments, where threats are unpredictable and the quality of information about threats is variable, all individuals face two fundamental challenges: balancing vigilance against other… Expand
The cost of being alone: the fate of floaters in a population of cooperatively breeding pied babblers Turdoides bicolor
- A. Ridley, N. Raihani, Martha J Nelson-Flower
- Biology
- 1 July 2008
The occurrence of group-living behaviour has often been explained by the benefits individuals receive through cooperation; including increased reproductive output, vigilance against predators, and… Expand
Monogamous dominant pairs monopolize reproduction in the cooperatively breeding pied babbler
- Martha J Nelson-Flower, P. Hockey, +5 authors A. Ridley
- Biology
- 1 May 2011
Understanding how reproduction is partitioned between group members is essential in explaining the apparent reproductive altruism of cooperatively breeding systems. Here, we use genetic data from a… Expand
The effects of temperature on offspring provisioning in a cooperative breeder
- Elizabeth M Wiley, A. Ridley
- Biology
- Animal Behaviour
- 1 July 2016
While most current predictive models agree that the climate is changing, it is not yet clear what impact these changes will have on animal populations. It is vital to determine the potential… Expand
Invading together: the benefits of coalition dispersal in a cooperative bird
- A. Ridley
- Biology
- Behavioral Ecology and Sociobiology
- 2011
Dispersal attempts can be costly and may often end in failure. Individuals should therefore only disperse when the benefits of dispersal outweigh the costs. While previous research has focussed on… Expand