Temperature and hen harrier productivity: from local mechanisms to geographical patterns

By Steve Redpath, B. Arroyo, B. Etheridge, F. Leckie, K. Bouwman, S. Thirgood. 2002

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From individual behaviour to population pattern: weather-dependent foraging and breeding performance in black kites (2003, background): “Furthermore, in most studies, the mechanisms by which weather affects individuals or populations are inferred rather than explicitly examined (Redpath et al. 2002).”
BirdTrends 2014: trends in numbers, breeding success and survival for UK breeding birds (2014, background): “In Scotland, chick mortality increased in cold temperatures and annual values of harrier fledged brood size were positively related to summer temperature (Redpath et al. 2002b) and warmer temperatures led to increased productivity (in the absence of persecution) in Wales (Whitfield et al. 2008).”
The effect of weather on lesser kestrel breeding success: can climate change explain historical population declines? (2003, background): “…time of hatching cause temporal declines in foraging activity, as has been seen in the American kestrel F. sparverius (Dawson & Bortolotti 2000) and in the hen harrier Circus cyaneus (Redpath et al. 2002), or in prey availability, causing mortality of complete clutches of recently hatched chicks.”