Abstract
The effects of habitat gaps on breeding success and parental daily energy expenditure (DEE) were investigated in great tits (Parus major) and blue tits (Cyanistes caeruleus) in urban parkland (Cardiff, UK) compared with birds in deciduous woodland (eastern England, UK). Tree canopy height, the percentage of gap in the canopy and the percentage of oak (in the wood only) within a 30 m radius of nest boxes were obtained from airborne remote-sensed data. Breeding success was monitored and parental DEE (great tits: both habitats; blue tits: park only) was measured using doubly labelled water in birds feeding young. In the park, mean (±SD) tree height (7.5 ± 4.7 m) was less than in the wood (10.6 ± 4.5 m), but the incidence of gaps (32.7 ± 22.6%) was greater (9.2 ± 14.7%). Great tits and blue tits both reared fewer young in the park and chick body mass was also reduced in park-reared great tits. Park great tits had a higher DEE (86.3 ± 12.3 kJ day−1) than those in the wood (78.0 ± 11.7 kJ day−1) and, because of smaller brood sizes, worked about 64% harder for each chick reared. Tits in the park with more than about 35% gap around their boxes had higher DEEs than the average for the habitat. In the wood, great tits with less oak around their boxes worked harder than average. Thus structural gaps, and functional gaps generated by variation in the quality of foraging habitat, increased the costs of rearing young.
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Acknowledgements
We would like to thank the Esmée Fairbairn Foundation for funding the DLW procedure. Thanks also to Natural England (especially Chris Gardiner), Cardiff City Council, (especially Chris Powell and Jonathan Green), and David Gaveau. The LiDAR data for Monks Wood were supplied by the Environment Agency, and the ATM data by the NERC Airborne Research and Survey Facility (ARSF). The LiDAR data for Bute Park were supplied by the NERC ARSF in conjunction with the Unit for Landscape Modelling at the University of Cambridge. Analysis of all remote sensed data was carried out whilst RAH was based at CEH Monks Wood. The DLW procedure, trapping and storage of samples were carried out under licences issued to SAH: Home Office Licence PPL 80/1756; Natural England: 20030897 & 20040579; Countryside Council for Wales: OTH: SB:03:2003, OTH:SB:02:2004 & OTH:SB:03:2005.
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Hinsley, S.A., Hill, R.A., Bellamy, P.E. et al. Effects of structural and functional habitat gaps on breeding woodland birds: working harder for less. Landscape Ecol 23, 615–626 (2008). https://doi.org/10.1007/s10980-008-9225-8
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DOI: https://doi.org/10.1007/s10980-008-9225-8