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Title: Interactions between resident tits and migratory warblers in an English broadleaved woodland
Author: Hewson, C. M.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2001
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This thesis is based on a field experiment designed to test hypotheses concerning interactions between resident and migratory birds. Initial analyses determined the habitat use and foraging niches of each of the study species. Whilst there were differences between species in their use of resources, the analyses revealed that there was as much overlap between resident -migrant species pairs as between resident - resident or migrant - migrant species pairs. This showed that potential for interactions between residents and migrants exists within the system. Analyses of the experimental data revealed no differences in the foraging behaviour of species between plots under the high and low density treatments, suggesting that niche shifts had not occurred due to inter- or intraspecific interactions. There was also no difference in the number of warblers settling in the study plots under different experimental treatments, although one warbler species, the garden warbler had significantly smaller territories under conditions of increased tit density. Analyses of the location of warbler territories revealed, after controlling for habitat selection by each species, that there was a positive correlation between change in occupancy of quadrats by blue tits between years and change in occupancy by the migratory garden warblers and blackcaps. This suggests that the warblers were attracted by the presence of blue tits when establishing territories, possibly using them as cues of safe and / or productive habitats, or gaining social benefits such as reduced risk of predation.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available