Détail de l'auteur
Documents disponibles écrits par cet auteur (23)
Ajouter le résultat dans votre panier Affiner la recherche
Article
Simon Foster, Auteur ; Ron W. Summers, Auteur ; R.L. (Bob) Swann, Auteur ; Tanya Scott, Auteur ; Les G. Underhill, AuteurEurasian Curlews Numenius arquata arquata which moult and winter in the Moray Firth, northern Scotland, had a mean start date of 24 June (95% range 18 May to 31 July) for primary moult, which then took a mean of 122 days, giving a mean completio[...]
Article
R.L. Swann, Auteur ; Ron W. Summers, Auteur ; Tanya Scott, Auteur ; Les G. Underhill, AuteurThe timing and duration of primary moult of Eurasian Oystercatchers Haematopus ostralegus that carry out post-nuptial moult and spend the winter in the Moray Firth, northern Scotland, varied according to their age and sex. There was also a long-[...]
Article
Ron W. Summers, Auteur ; Phil Golder, Auteur ; Nicole Wallace, Auteur ; Ewan Munro, Auteur ; Jeremy D. Wilson, AuteurCapsule: The inherited pattern of roads and tracks, now primarily used by people for recreation in the Cairngorms National Park, was associated with a reduced presence of Capercaillie Tetrao urogallus signs in woodland.Aims: To examine if the di[...]
Article
Ron W. Summers, Auteur ; Snaebjorn Palsson, Auteur ; Colin Corse, Auteur ; Brian Etheridge, Auteur ; Simon Foster, Auteur ; Bob Swann, AuteurCapsule Sex ratios were determined for 11 wader species at the northern end of the East Atlantic flyway in winter. The ratio was even for six species, there were more males for four species, and more females for one species.Aims To describe the [...]
Article
Ron W. Summers, Auteur ; Roddy A. Mavor, Auteur ; Sandra Hogg, Auteur ; Ron Harriman, AuteurCapsule Slavonian (Horned) Grebes Podiceps auritus bred on moderately sized lakes, preferring those with small fish, clear water, and over-hanging trees. Aim To describe breeding habitat and investigate factors likely to influence lake selection[...]
Article
Gunnar Thor Hallgrimsson, Auteur ; Snaebjorn Palsson, Auteur ; Ron W. Summers, Auteur ; Gudmundur Orn Benediktsson, AuteurCapsule The uneven sex ratio in favour of males found in flocks of Purple Sandpipers is not evident in chicks; female chicks are lighter than males. Aims To test if there is an uneven sex ratio at hatching and to investigate whether sex ratio ch[...]
Article
Gunnar Thor Hallgrimsson, Auteur ; Snaebjorn Palsson, Auteur ; Ron W. Summers, Auteur ; Gudmundur Orn Benediktsson, AuteurCapsule The uneven sex ratio in favour of males found in flocks of Purple Sandpipers is not evident in chicks; female chicks are lighter than males. Aims To test if there is an uneven sex ratio at hatching and to investigate whether sex ratio ch[...]
Article
Ron W. Summers, Auteur ; Desmond Dugan, Auteur ; Robert Proctor, AuteurCapsule In most years, changes in numbers are associated with variations in breeding success. Aims To describe the annual variation in numbers and breeding success of Capercaillies Tetrao urogallus and Black Grouse Tetrao tetrix at Abernethy For[...]
Article
Ian A. Dillon, Auteur ; Mark H. Hancock, Auteur ; Ron W. Summers, Auteur
Article
Sarah D. Taylor, Auteur ; Ron W. Summers, AuteurDans Bird Study (56 2009)Capsule Old-growth stands within an ancient native pinewood in Scotland provide an important habitat for both species. Aims To obtain estimates of densities and total numbers of male Redstarts and Tree Pipits in a native pinewood, and to describ[...]
Article
Ron W. Summers, Auteur ; Robert J. G. Dawson, Auteur ; Ron E. Phillips, AuteurThere are three breeding taxa of crossbills in highland Scotland, the common crossbill Loxia curvirostra, parrot crossbill L. pytyopsittacus and endemic Scottish crossbill L. scotica. These taxa show no genetic differentiation in neutral DNA (mi[...]
Article
Gunnar Thor Hallgrimsson, Auteur ; Snaebjoern Palsson, Auteur ; Ron W. Summers, AuteurPurple Sandpipers (Calidris maritima) are sexually dimorphic, with females larger than males. We tested the reliability of using bill length to sex individuals and estimate the sex ratio at a stopover site in Iceland in May 2003 and 2005. Feathe[...]
Article
Ron W. Summers, Auteur ; Les G. Underhill, Auteur ; Manfred Waltner, Auteur ; Robert L. Swann, AuteurWe describe the migration, biometrics and moult of Red Knot Calidris canutus canutus in southern Africa and compare them with the biometrics and moult of Calidris canutus islandica in northern Europe to examine possible adaptations to different [...]
Article
Ron W. Summers, Auteur ; Stephen T. Buckland, AuteurA survey of Scottish Crossbills Loxia scotica was carried out in 3,506 km(2) of conifer woodland in northern Scotland during January to April 2008 to provide the first estimate of the global population size for this endemic bird. Population esti[...]
Article
Malcolm Smith, Auteur ; Mark Bolton, Auteur ; David J. Okill, Auteur ; Ron W. Summers, Auteur ; Pete Ellis, Auteur ; Felix Liechti, Auteur ; Jeremy D. Wilson, AuteurThe migration route of Red-necked Phalarope populations breeding on North Atlantic islands has been subject to considerable speculation. Geolocator tags were fitted to nine Red-necked Phalaropes breeding in northern Scotland to assess whether th[...]
Article
Ron W. Summers, AuteurThe Parrot Crossbill Loxia pytyopsittacus is regarded as a rare breeding species in Britain. During a study in Abernethy Forest, Highland, from 1995 to 2001, it was, however, found to be the most abundant crossbill species nesting there. Of all [...]
Article
Ron W. Summers, AuteurA Parrot Crossbill Loxia pytyopsittacus nest at Abernethy Forest, Highland, was video-recorded from the laying of the first egg to fledging, allowing a detailed description of nest attendance by the parents. The four eggs were laid over a period[...]
Article
Rik D. Smith, Auteur ; Ron W. Summers, AuteurThe tiny population of Purple Sandpipers Calidris maritima breeding in the central Highlands of Scotland fluctuated between one and five pairs between 1978, when first discovered, and 2001. A detailed study was carried out between 1,987 and 1993[...]
Article
Ian A. Dillon, Auteur ; Mark Hancock, Auteur ; Ron W. Summers, Auteur
Article
Ron W. Summers, AuteurDans Ibis (149 NOV 2007)A study at Abernethy Forest, Scotland, examined stand selection by some of the birds of conservation concern that inhabit pinewoods. Abernethy Forest was ideally suited for the study because all four main stand types of forest development (stand[...]
Article
Ron W. Summers, Auteur ; Robert J. G. Dawson, Auteur ; Robert Proctor, AuteurThe breeding biology and cone size selection of crossbills was studied mainly during 1995 to 2002 at Abernethy Forest, Scotland, an ancient native Scots pine Pinus sylvestris wood, where only a single crossbill species, the Scottish crossbill Lo[...]
Article
Gunnar Thor Hallgrimsson, Auteur ; Ron W. Summers, Auteur ; Brian Etheridge, Auteur ; Bob Swann, AuteurIceland has a large resident population of Purple Sandpipers Calidris maritima, but is also believed to be a wintering area for other populations and is a stopover site for migrants. To determine the wintering areas of those that prepare for wes[...]
