N B Davies; J R Krebs; Stuart A West's An introduction to behavioural ecology PDF

By N B Davies; J R Krebs; Stuart A West

ISBN-10: 1444398458

ISBN-13: 9781444398458

Common choice, ecology and behavior -- checking out hypotheses in behavioural ecology -- monetary judgements and the person -- Predators as opposed to prey: evolutionary fingers races -- Competing for assets -- dwelling in teams -- Sexual choice, sperm festival and sexual clash -- Parental care and relatives 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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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. Our conclusion is that both sexual competition and predation may have influenced the evolution of sexual dimorphism in tooth size. There is also the further possibility that differences in tooth size are important in reducing diet overlap between the sexes, so preventing competition for food. This example shows that, even with careful analysis, it may be difficult to tease out the effect of several variables on the evolution of a trait.

Reprinted with permission from AAAS. emergence of oak leaves (Quercus robur) and of winter moth caterpillars (Operophtera brumata), which feed on the oak leaves and are a key food for nestling tits. The rates of change of egg laying date with temperature (Fig. 11c) and of caterpillar emergence with temperature (Fig. 11d) are similar, so the tits have closely tracked the temporal changes in food availability over almost five decades. How have the tits managed to do this? For temperate breeding birds, an increasing photoperiod in the spring is the primary proximate cue that initiates gonadal growth and the hormonal changes involved in breeding.

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.

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An introduction to behavioural ecology by N B Davies; J R Krebs; Stuart A West

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