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

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

Normal 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 kinfolk conflicts -- Mating structures -- intercourse allocation -- Social behaviours: altruism to spite -- Cooperation -- Altruism and clash within the social bugs -- communique and indications -- end

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Breeding in southern Sweden. Observed clutch sizes varied from five to eight depending on feeding conditions in different territories. To test the hypothesis that some females laid only five eggs because this was the maximum number of young they could raise efficiently on their particular territories, Högstedt manipulated clutch sizes experimentally. He found that pairs that had produced large clutches did best with large broods, while those which had laid small clutches did best with smaller broods (Fig.

Field experiments reveal that clutch size in great tits maximizes individual lifetime reproductive success. Life history trade-offs include those between quantity and quality of offspring within a brood, and between current and future reproduction. Recent studies of how great tits have advanced their time of breeding in relation to climate warming provide a good example of phenotypic plasticity (the ability of a single genotype to produce different phenotypes in response to environmental conditions).

Sexual dimorphism in tooth size Sexual dimorphism evolves from sexual competition Males often have larger teeth than females. , 1978). 0 Fig. 6 The degree of sexual dimorphism increases with the number of females per male in the breeding group. Each point is a different genus, some of which are indicated by name. From Clutton-Brock and Harvey (1977). 9 Aotus 1 2 3 4 5 6 7 Sex ratio in breeding group (No. indd 36 against predators. Alternatively, males may have larger teeth for competition with other males over access to females.

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