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Regulation of numbers in the Great tit (Aves: Passeriformes)
Author(s) -
Krebs John R.
Publication year - 1970
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/j.1469-7998.1970.tb01268.x
Subject(s) - biology , population density , hatching , predation , density dependence , avian clutch size , economic shortage , population , census , ecology , clutch , seasonal breeder , population size , zoology , reproduction , demography , linguistics , philosophy , physics , sociology , government (linguistics) , thermodynamics
The census data of the Great tit collected by Perrins (1965) and others in Marley Wood near Oxford are analysed for density‐dependence. Clutch size and hatching success are density‐dependent and sufficiently so to regulate the population at the observed level (assuming that there is in addition a fairly large density‐independent mortality). There may also be some weak density‐dependent mortality outside the breeding season. The density‐dependent variations in clutch size are probably in the main due to shortage of available food and density‐dependent hatching failure is caused by predation. Territorial behaviour has been shown experimentally to determine breeding density, and may produce a density‐dependent effect outside the breeding season. These three factors are responsible for regulation of the Great tit population in Marley Wood.