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Article
John Calladine, Auteur ; Chris Southall, Auteur ; Neil Morrison, AuteurHabitat use by remotely tracked Short-eared Owls, tagged in Scotland but travelling widely around Europe and into North Africa, was assessed when they were away from their preferred extensive blocks of moorland and mire habitats. Birds spent 18%[...]
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John Calladine, Auteur ; Chris Southall, Auteur ; Anthony Wetherhill, Auteur ; Neil Morrison, AuteurThe constituent habitat use by remotely tracked tagged Short-eared Owls Asio flammeus on moorland and other dwarf shrubland–grassland mosaics was assessed in Britain and Norway. A preference for the owls to hunt over patches of graminoids within[...]
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Capsule The distribution of breeding Whinchats Saxicola rubetra shifted uphill following the cessation of grazing, potentially compromising their breeding success through additional squeezing of suitable habitat and environmental niches.Aims To [...]
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David Jarrett, Auteur ; John Calladine, Auteur ; Anne Cotton, Auteur ; Mark William Wilson, Auteur ; Elizabeth Humphreys, AuteurCapsule: Non-breeding waterbirds are more likely to respond to drone approach when in larger flocks, and responses are more likely in arable and coastal habitats than at inland lochs. Aims: To investigate the extent to which drones are a potenti[...]
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John Calladine, Auteur ; David Jarrett, Auteur ; Mark Wilson, AuteurCapsule: Local micro-climate, as well as habitat, influences the abundance of birds within dynamically changing upland habitats.Aims: To identify the relative importance of near-ground temperature (as an index of climate at a scale typical of th[...]
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Michael V. Bell, Auteur ; John Calladine, AuteurCapsule: Changes in sward height, driven by changes in management, were associated with a large decline in a population of farmland breeding waders.Aims: To examine the relationship between changes in habitat and numbers of breeding wader on an [...]
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Christopher Murray, Auteur ; Jeroen Minderman, Auteur ; James Allison, Auteur ; John Calladine, AuteurCapsule: Whinchat Saxicola rubetra foraging behaviour was significantly influenced by habitat structure and grazing.Aims: To assess how foraging habitats selected by breeding Whinchats differed from wider territory attributes under contrasting g[...]
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Ian Henderson, Auteur ; John Calladine, Auteur ; Dario Massimino, Auteur ; Jennifer A. Taylor, Auteur ; Simon Gillings, AuteurCapsule The recent population decline of Whinchats has accelerated, including core breeding areas of Britain. Contrasting patterns of change with Stonechat suggest a large-scale environmental driver is affecting the entire Whinchat population. A[...]
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John Calladine, Auteur ; Robin J. Pakeman, Auteur ; Elizabeth Humphreys, Auteur ; Sally Huband, Auteur ; Robert J. Fuller, AuteurCapsule Changing agricultural activity and soil chemistry appear to be associated with some changes in breeding wader assemblages on the machair of the Outer Hebrides, Scotland, between the 1980s and 2000s. Aims To identify potential factors in [...]
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John Calladine, Auteur ; C. Nigel R. Critchley, Auteur ; David Baker, Auteur ; James Towers, Auteur ; Andre Thiel, AuteurCapsule A specific suite of moorland management prescriptions had no clear positive impact on breeding birds over ten years.Aims To test the expectation that a combination of grazing, and burning/cutting manipulations, the blocking of drains (af[...]
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John Calladine, Auteur ; Andrew Bielinski, Auteur ; Geoff Shaw, AuteurCapsuleBird species richness and (for most species) abundance were positively related to the extent of shrub cover at the interface between conifer plantations and moorland, but it appears that responses to shrub development vary between differe[...]
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John Calladine, Auteur ; Andrew Bielinski, Auteur ; Geoff Shaw, AuteurCapsuleBird species richness and (for most species) abundance were positively related to the extent of shrub cover at the interface between conifer plantations and moorland, but it appears that responses to shrub development vary between differe[...]
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John Calladine, Auteur ; Neil Morrison, AuteurCapsule The total area encapsulated by the hunting ranges of breeding Short-eared Owls Asio flammeus was broadly similar between day and night and also through the season, but activity was concentrated more on lower altitude graminoid-dominated [...]
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John Calladine, Auteur ; James Bray, AuteurCapsule The likelihood of an area being occupied by breeding Whinchats was inversely related to altitude, and areas with south- and east-facing aspects were favoured over those with north- and west-facing aspects. Aims To identify habitat featur[...]
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John Calladine, AuteurCapsule Low and variable encounter rates of birds in fragmented arctic-alpine habitats add difficulty to monitoring their breeding populations. Aims To quantify seasonal variation in the encounter rates ( apparent abundance) of breeding birds in[...]
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John Calladine, AuteurCapsule Low and variable encounter rates of birds in fragmented arctic-alpine habitats add difficulty to monitoring their breeding populations. Aims To quantify seasonal variation in the encounter rates ( apparent abundance) of breeding birds in[...]
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Robert J. Fuller, Auteur ; Elizabeth M. Humphreys, Auteur ; Jeremy D. Wilson, Auteur ; David G. Hoccom, Auteur ; John Calladine, AuteurCapsule The machair of the Uists continues to support one of the most important assemblages of breeding waders in Europe, but there have been major variations in population change across the archipelago, the causes of which are poorly understood.
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John Calladine, Auteur ; Graeme Garner, Auteur ; Chris Wernham, Auteur ; Nigel Buxton, AuteurCapsule The proportion of time during which breeding Short-eared Owls could be seen during daylight hours was low and assessment of seasonal variation in their detection likelihoods suggests that surveys may only be able reliably to identify pai[...]
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John Calladine, Auteur ; Graeme Garner, Auteur ; Chris Wernham, Auteur ; Nigel Buxton, AuteurCapsule The proportion of time during which breeding Short-eared Owls could be seen during daylight hours was low and assessment of seasonal variation in their detection likelihoods suggests that surveys may only be able reliably to identify pai[...]
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John Calladine, Auteur ; Elizabeth M. Humphreys, Auteur ; Fiona Strachan, Auteur ; David C. Jardine, AuteurDans Bird Study (56 2009)Capsule Levels of thinning practised in upland Scotland are insufficient to permit the development of ground vegetation and shrub layers that might enhance some breeding bird populations.
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John Calladine, Auteur ; Graeme Garner, Auteur ; Chris Wernham, Auteur ; Andre Thiel, AuteurDans Bird Study (56 2009)Capsule A minimum of four constant-effort-search survey visits are required to generate reliable population estimates of breeding birds on moorland that are not subject to biases associated with varying levels of detectability through the season[...]
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John Calladine, Auteur ; Chris du Feu, Auteur ; Richard du Feu, AuteurAnalysis of ring recovery data for Short-eared Owls Asio flammeus spanning 96 years, 1912-2007, identified spatial and temporal differences in migration patterns. Birds with breeding areas or natal origins in the Boreal (principally Fenno-Scandi[...]
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Kirsty J. Park, Auteur ; Kate E. Graham, Auteur ; John Calladine, Auteur ; Chris W. Wernham, AuteurDans Ibis (150 AUG 2008)The influence of predators on the distribution, density and dynamics of their prey species has long been of interest to ecologists and wildlife managers. Where the prey population is also utilized by humans, conflicts may arise through competiti[...]
Article
John Calladine, Auteur ; Neil Morrison, AuteurThe detected ranges (mean convex polygons) of two male radio-tagged Hawfinches in March 2007 were 34.9 and 1.2 km(2), however that of the latter male was likely to be an underestimate because of its relatively infrequent detection. Constant moni[...]
