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Reference: Minot, Edward O., (1980). Interspecific competition between Blue and Great tits. DPhil. University of Oxford.Citable link to this page:

 

Interspecific competition between Blue and Great tits

Abstract: Great tits (Aves: Passeriformes; Parus major) and blue tits(Parus caeruleus) nested in boxes in Wytham Woods near Oxford. Thebreeding densities of both species were limited by the availabilityof nest sites. The larger great tits were dominant in obtaining nestboxes. This was most important where breeding sites were scarce. Thetwo species did not maintain interspecific territories or interferewith interspecific nest site spacing beyond the immediate vicinityof the nest. Blue and great tit numbers fluctuated in parallel wherenest sites were not limiting resources. Annual changes in breedingnumbers of great tits were negatively related to blue tit breedingdensity but great tit density did not seem to affect changes in theblue tit population.Overlap in the feeding sites of blue and great tits was greatestduring the summer and interference competition was lowest at this time.The nestling diets of the two species were very similar. Despite anapparent abundance of food for nestlings, adults were pressed to feedlarge broods. Food for nestlings was probably a limiting anddepletable resource.The date of clutch initiation of great tits, but not blue tits,was retarded at high densities of blue or great tits. The clutchsizes of both species were probably negatively affected by high breedingdensities of congeners but the results were not clear cut.Heavy great tit fledglings are most likely to survive to breed.Great tit fledglings were heavier at low densities of blue tits. Anexperiment in which blue tit young were removed from a section of theWoods, showed that great tit nestlings were heavier and developedfaster, and that female condition was better, than in a controlsection or section where blue tit broods were supplemented.In terms of resource competition, blue tits were the betterscramble competitors and great tits the better interferencecompetitors.

Type of Award:DPhil Level of Award:Doctoral Awarding Institution: University of Oxford Notes:The digital copy of this thesis has been made available thanks to the generosity of Dr Leonard Polonsky

Contributors

Perrins, Christopher M.More by this contributor

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Chris PerrinsMore by this contributor

RoleSupervisor

 Bibliographic Details

Issue Date: 1980Identifiers

Urn: uuid:d27d0b34-ec0b-4671-a9d9-7d20b5f58ef7

Source identifier: 602800684 Item Description

Type: Thesis;

Language: eng Subjects: Wytham Wood (Oxfordshire, England) Competition (Biology) Blue tit Ecology Great tit Resource partitioning (Ecology) Tiny URL: td:602800684

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Autor: Minot, Edward O. - institutionUniversity of Oxford facultyLife and Environmental Sciences Division facultyDept. of Zoology - - -

Fuente: https://ora.ox.ac.uk/objects/uuid:d27d0b34-ec0b-4671-a9d9-7d20b5f58ef7



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