Kenward, R.E. and Walls, S.S. and Hodder, K.H. and Pahkala, M. and Freeman, S.N. and Simpson, V.R. (2000) The prevalence of non-breeders in raptor populations: evidence from rings, radio-tags and transect surveys. Oikos, 91 (2). pp. 271-279. ISSN 0030-1299.
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Age-specific survival and breeding (ASSAB) models were developed with data from 146 common buzzards (Buteo buteo) radio-tagged in southern Britain during 1990-1998, in a 120-km(2) study area that had on average 25 egg-laying pairs. Survival checks were aided by philopatric behaviour and a maximum annual tag failure rate of 7%: minimum survival rates, that were estimated by assuming death of buzzards with lost tags, were close to maximum rates that were estimated using only the recorded deaths. First-year survival rate estimates for 35 buzzards fitted in 1990-1991 with 25-30-g backpack radios were 69-74% (minimum-maximum), close to the 61-71% for 16 buzzards with 12-g tail-mount radios; the backpacks transmitted for 2-4 yr. Overall survival rates were 66-73% in the first year, 91-97% in the second and 88-91% thereafter. Survival estimates from 258 recent British ring recoveries were lower in the first and second years, at 55% and 75%, but similar (88%) thereafter. Most deaths were from natural causes (40%) or interaction with artefacts (36%). ASSAB models. from radio-tracking and the observed 1.71 young clutch(-1), predicted breeding by 16-21% of all the buzzards present in spring, or up to 25% with the minimum likely productivity of 1.4 young clutch(-1) or 12% net emigration. Ringing data predicted breeding rates of 33-38%. The models were tested with density data from nest surveys and new radio-corrected-transect and truncation-mark-resighting estimates of buzzard numbers. Surveys in autumn and late winter estimated breeding rates of 21-25%. The high non-breeder density in spring. of three other buzzards for each paired bird with eggs, has important implications for understanding evolutionary fitness, predation and population ecology.
|Subjects:||G Geography. Anthropology. Recreation > GF Human ecology. Anthropogeography|
|Divisions:||Faculties > Science Technology and Medical Studies > School of Mathematics Statistics and Actuarial Science|
|Depositing User:||O.O. Odanye|
|Date Deposited:||02 Apr 2009 19:11|
|Last Modified:||08 Jun 2012 13:21|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/16278 (The current URI for this page, for reference purposes)|
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