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Article
R. W. Summers, Auteur ; H. Boland, Auteur ; K. Colhoun, Auteur ; N. Elkins, Auteur ; B. Etheridge, Auteur ; S. Foster, Auteur ; J. W. Fox, Auteur ; K. Mackie, Auteur ; L. R. Quinn, Auteur ; R. L. Swann, AuteurBird migration is generally scheduled to avoid other energetically expensive events in the annual cycle (e. g. moult) and seasons when survival can be difficult (e. g. northern winters). Purple Sandpipers winter at relatively high latitudes comp[...]
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R. W. Summers, AuteurCapsule: Hole-nesting birds tended to breed in the largest pine snags (standing dead trees) predominating in ancient native pinewood and scarce in plantations. Aims: To describe and compare the density, volume and sizes of pine snags in differen[...]
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R. W. Summers, Auteur ; M. Nicoll, Auteur ; W. Peach, AuteurPurple Sandpipers wintering on the Kincardine coast had (a protracted autumn arrival (one-quarter and three-quarters of the birds arrived on
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I. M. Evans, Auteur ; R. W. Summers, Auteur ; L. O'Toole, Auteur ; D. C. Orr-Ewing, Auteur ; R. Evans, Auteur ; N. Snell, Auteur ; J. Smith, AuteurIn an attempt to extend the breeding range of the Red Kite within the United Kingdom, 93 (48 males and 45 females) juvenile Red Kites, originating from Spain, Sweden and Wales, were released in southern England in 1989-94, and 93 (52 males, 40 f[...]
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R. W. Summers, Auteur ; Mike Nicoll, Auteur
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J. Amouret, Auteur ; D. A. G. Barisas, Auteur ; G. T. Hallgrimsson, Auteur ; R. W. Summers, Auteur ; S. Palsson, AuteurThe Icelandic subspecies of Eurasian wren Troglodytes troglodytes islandicus has been described as a large wren which is sedentary on the island. It is one member of a large passerine complex which is widely distributed over the Holarctic except[...]
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R. W. Summers, Auteur ; T. Piersma, Auteur ; K. B. Strann, Auteur ; P. Wiersma, AuteurDans Ardea (86(1) 1998)Winter north of the Arctic circle in northern Norway is colder, windier and there is less solar radiation than in eastern Scotland, at a latitude 13 degrees further south. We predicted from equations derived from heated taxidermic mounts that th[...]
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R. W. Summers, Auteur ; R. A. Mavor, AuteurBottle Sedge Carex rostrata provided the main nesting habitat of Slavonian Grebes in Scotland. In the sedge beds, the sedge density decreased and water depth increased from land to open water. The grebes preferred to nest in dense sedges growing[...]
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R. W. Summers, Auteur
Article
S. T. Buckland, Auteur ; R. W. Summers, Auteur ; D. L. Borchers, Auteur ; L. Thomas, Auteur1. The ability to monitor abundance of animal populations is becoming increasingly important, in light of growing concerns over the loss of biodiversity through anthropogenic changes. A widely used tool for such monitoring is distance sampling, [...]
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R. W. Summers, Auteur
Article
R. W. Summers, Auteur ; B. Etheridge, AuteurOne hundred Turnstones were ringed with both incolony and stainless steel rings on the Moray coast, Scotland, to measure the rates of wear of these rings. When new, the steel rings were larger and 2.6 times heavier than the incoloy rings. The ra[...]
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L. G. Underhill, Auteur ; R. W. Summers, Auteur
Article
C. J. Corse, Auteur ; R. W. Summers, AuteurThere are two populations of Purple Sandpipers in Orkney; 'long-billed' birds, which predominate, and 'short-billed' birds. They arrived mainly during October and November, and departed in April and May from sites on Mainland and South Ronaldsay[...]
