By N B Davies; J R Krebs; Stuart A West
Average choice, ecology and behavior -- checking out hypotheses in behavioural ecology -- fiscal judgements and the person -- Predators as opposed to prey: evolutionary palms races -- Competing for assets -- dwelling in teams -- Sexual choice, sperm pageant and sexual clash -- Parental care and family members conflicts -- Mating platforms -- intercourse allocation -- Social behaviours: altruism to spite -- Cooperation -- Altruism and clash within the social bugs -- verbal exchange and indications -- end
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Extra resources for An introduction to behavioural ecology
1a), seem to make good sense as adaptations to reduce predation. For example, the adults take flight whenever a predator approaches and they give alarms and attack it. They maintain the camouflage of the nest by refraining from defecation nearby and, soon after hatching, they remove the empty eggshells, which have white interiors likely to attract predators. The chicks, like the eggs, are cryptically coloured; they leave the nest soon after hatching and hide in the vegetation. This leads to some mixing of neighbouring broods, so it makes sense that adults learn to recognize the calls of their own chicks early on to ensure they direct their parental care to their own young.
The analysis can be taken a step further by considering species where several males live together in a group (multimale troops). It is found that, within this type of social organization, the males of terrestrial species have larger teeth for their body size than arboreal species. Therefore, even within the same mating system there is a difference in tooth size in different habitats. The terrestrial environment is usually thought to present greater risks of predation, so predation pressure may have been responsible for the evolution of larger teeth in terrestrial species.
Davies, John R. Krebs and Stuart A. West. © 2012 Nicholas B. Davies, John R. Krebs and Stuart A. West. Published 2012 by John Wiley & Sons, Ltd. indd 24 1/12/2012 4:43:43 PM Testing Hypotheses in Behavioural Ecology 25 functional questions. , 1967). (3) Comparison among species. Different species have evolved in relation to different ecological conditions and so comparison among species may help us to understand how differences in feeding ecology or predation pressure, for example, influence the tendency to live in groups or to be solitary.
An introduction to behavioural ecology by N B Davies; J R Krebs; Stuart A West