New PDF release: Animal Population Ecology

By J. Dempster (Auth.)

ISBN-10: 0122095502

ISBN-13: 9780122095504

A few simple thoughts. assets. Social behaviour. Qualitative alterations in contributors. traditional enemies. climate. designated inhabitants reviews. Popolation cycles. inhabitants theories. functions of inhabitants ecology

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In these, the number of prey attacked increased rapidly with initial increases in prey density. The curve flattened out at higher prey densities however, when the parasite had laid all of its eggs (Curve B, Fig. 11 ). An example of this type of response is seen in Burnett's Prey density Fig. 11 : The three basic types of individual behavioural response of predators to changes in prey numbers. data for Dahlbominus fuliginosus attacking cocoons of Neodiprion sertifer (Burnett, 1951) (Fig. 12). The last type of response recognized by Holling is a sigmoid curve (Curve C, Fig.

Disease Infectious diseases can cause very high mortalities during epizootics (epidemics). Pathogens are transmitted by either ingesting contaminated food, by vectors, or by direct contact, so that the ease and speed of spread will depend partly upon population density. It will however, also depend upon other environmental factors which affect the survival of the organism during transmission. For example, many disease organisms are very dependent upon the right weather conditions for survival outside the bodies of their hosts.

At low densities, territorial behaviour ensures a mosaic pattern of dispersion, but no individuals will be prevented from breeding through lack of a territory. At a higher density, some individuals may be forced to breed in less favourable areas. Krebs (1971) describes an example of this sort for great tits {Parus major). He showed that territorial behaviour limited the number of pairs breeding in his woodland, and forced some birds 4. Social Behaviour 35 to nest in the surrounding hedgerows, where reproductive success was lower.

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Animal Population Ecology by J. Dempster (Auth.)

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