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Documents disponibles écrits par cet auteur (14)
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Article
Bernard Spaans, Auteur ; Laurens Van Kooten, Auteur ; Jenny Cremer, Auteur ; Jutta Leyrer, Auteur ; Theunis Piersma, AuteurCapsule Population estimates based on the mark-resighting method can be a useful alternative to population-wide counts. Aims To investigate whether the mark-resighting method can be used as an alternative to counts to estimate the size of wader [...]
Article
Jan van Gils, Auteur ; Theunis Piersma, Auteur ; Anne Dekinga, Auteur ; Bernard Spaans, AuteurDans Limosa (73(1) 2000)This is a progress report on a study in 1999 during which we marked 45 wing-moulting Knots at Richel in early August and then followed their tide-induced movements in the western Dutch Wadden Sea by using 14 strategically placed automatic record[...]
Article
Kees Koffijberg, Auteur ; Jan Beekman, Auteur ; Leo Van Den Bergh, Auteur ; Cor Berrevoets, Auteur ; Bart Ebbinge, Auteur ; Trinus Haitjema, Auteur ; Jules Philippona, Auteur ; Jouke Prop, Auteur ; Bernard Spaans, Auteur ; Menno Zijlstra, AuteurDans Limosa (71(1) 1998)This paper summarises results of goose and swan counts in The Netherlands from 1990/91 through 1994/95, presenting information on numbers and percentage of first year birds (Tabs. 2-13), trends (Fig. 2), seasonal patterns (Fig. 3) and spatial di[...]
Article
Piet J. Van Den Hout, Auteur ; Bernard Spaans, Auteur ; Theunis Piersma, AuteurDans Ibis (150 AUG 2008)Predators may influence many aspects of the daily life and seasonal movements of their prey. Here we quantify direct, and evaluate indirect effects of predation by three falcon species (Lanner Falcon Falco biarmicus, Barbary Falcon Falco pelegri[...]
Article
Barwolt S. Ebbinge, Auteur ; Peter Prokosch, Auteur ; Bernard Spaans, Auteur ; Gerhard J. D. M. Muskens, Auteur ; Roeland Bom, Auteur ; Yakov I. Kokorev, Auteur ; Evgeny E. Syroechkovskiy, AuteurThe distribution of Dark-bellied Brent Geese Branta b. bernicla moulting on the Taimyr Peninsula, in the Russian arctic, varies between years depending on whether the birds had a successful breeding season. Counts made of moulting flocks show th[...]
Article
Sjoerd Duijns, Auteur ; Jacintha G. B. van Dijk, Auteur ; Bernard Spaans, Auteur ; Joop Jukema, Auteur ; Willem F. de Boer, Auteur ; Theunis Piersma, AuteurDifferent spatial distributions Of food abundance and predators may urge birds to make a trade-off between food intake and danger. Such a trade-off might be solved in different ways in migrant birds that either follow a time-minimizing or energy[...]
Article
Jutta Leyrer, Auteur ; Tamar Lok, Auteur ; Maarten Brugge, Auteur ; Bernard Spaans, Auteur ; Brett K. Sandercock, Auteur ; Theunis Piersma, AuteurEstimates of seasonal mortality for long-distance migrant birds are extremely challenging to collect and consequently reports are scarce. Determining when and where mortality occurs within the annual cycle is important for an understanding of po[...]
Article
Theunis Piersma, Auteur ; Bernard Spaans, AuteurThis is a brief review of the international research on waders, or shorebirds, entertained by teams from the University of Groningen and the Royal Netherlands Institute for Sea Research in The Netherlands. Extending the ecological studies to mud[...]
Article
Sjoerd Duijns, Auteur ; Joop Jukema, Auteur ; Bernard Spaans, Auteur ; Peter van Horssen, Auteur ; Theunis Piersma, AuteurTwo populations of Bar-tailed Godwits Limosa lapponica occur along the East-Atlantic Flyway. The European population (L. I. lapponica) is supposed to breed in northern Scandinavia and has been suggested to only winter in Europe. The Afro-Siberia[...]
Article
Phil F. Battley, Auteur ; WOUTER K. VAHL, Auteur ; Bernard Spaans, Auteur
Article
Eldar Rakhimberdiev, Auteur ; Piet J. Van Den Hout, Auteur ; Maarten Brugge, Auteur ; Bernard Spaans, Auteur ; Theunis Piersma, AuteurMigratory bird populations may be limited during one or more seasons, and thus at one or more places, but there is a dearth of empirical examples of this possibility. We analyse seasonal survival in a migratory shellfish-eating shorebird (red kn[...]
Article
Bernard Spaans, Auteur ; Kees van't Hoff, Auteur ; Willem van der Veer, Auteur ; Barwolt S. Ebbinge, AuteurThe probability of successful breeding by Brent geese in the Arctic appears to be positively correlated with the mass of females when they depart from spring staging areas in North-western Europe. To clarify the mechanism behind this relationshi[...]
Article
Christophe Brochard, Auteur ; Bernard Spaans, Auteur ; Jouke Prop, Auteur ; Theunis Piersma, Auteur
Article
Casper Kraan, Auteur ; Jan A. van Gils, Auteur ; Bernard Spaans, Auteur ; Anne Dekinga, Auteur ; Theunis Piersma, AuteurAfro-Siberian Red Knots Calidris canutus canutus use the western Dutch Wadden Sea as a refuelling area during southward migration from Taimyr to West Africa. Here we document the decline of their food stocks in this area, based on a yearly large[...]
