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Auteur Ben J. Koks |
Documents disponibles écrits par cet auteur (12)
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Article
Angela Wieringa, Auteur ; Raymond H. G. Klaassen, Auteur ; Almut E. Schlaich, Auteur ; Ben J. Koks, AuteurIn many owl and raptor species, sexes have distinct parental roles. Females incubate the eggs and raise the chicks until independence, while males provide females and their chicks with food. This is believed to reduce sexual conflict over parent[...]Article
Iben H. Sørensen, Auteur ; Almut E. Schlaich, Auteur ; Raymond H. G. Klaassen, Auteur ; Henning Heldbjerg, Auteur ; Ben J. Koks, AuteurOver-summering within or near the African wintering range by immature, non-breeding individuals occurs regularly in several species of long-distance migratory raptors, yet the extent of over-summering in Africa by adult birds remains unclear. In[...]Article
Almut E. Schlaich, Auteur ; Raymond H. G. Klaassen, Auteur ; Willem Bouten, Auteur ; Christiaan Both, Auteur ; Ben J. Koks, AuteurFarmland birds are in steep decline and agri-environment schemes (AES) to counteract these biodiversity losses are expensive and inefficient. Here we test a novel AES, ‘Birdfields’, designed using detailed ecological knowledge of the target spec[...]Article
Almut E. Schlaich, Auteur ; Raymond H. G. Klaassen, Auteur ; Willem Bouten, Auteur ; Christiaan Both, Auteur ; Ben J. Koks, AuteurFarmland birds are in steep decline and agri-environment schemes (AES) to counteract these biodiversity losses are expensive and inefficient. Here we test a novel AES, Birdfields\', designed using detailed ecological knowledge of the target spec[...]Article
Henk Jan Ottens, Auteur ; Marije W. Kuiper, Auteur ; Heiner Flinks, Auteur ; Jasper van Ruijven, Auteur ; Henk Siepel, Auteur ; Ben J. Koks, Auteur ; Frank Berendse, Auteur ; Geert R. De Snoo, AuteurTo help restore food availability for birds, arable field margins (extensively managed strips of land sown with grasses and forbs) have been established on European farmland. In this study we describe the effect of field margins on the diet of E[...]Article
Ben J. Koks, Auteur ; Kees C. W. M. van Scharenburg, Auteur ; Erik G. Visser, AuteurDans Limosa (74(4) 2001)The Montagu's Harrier was threatened to become extinct as a breeding bird in the Netherlands towards the end of the nineteen eighties. The province Flevoland was by far the most important region for the species between 1975 and 1989. However, th[...]Article
Ben J. Koks, AuteurDans Limosa (71(1) 1998)A Turnstone in breeding plumage was observed in a salt marsh north of Hornhuizen, Groningen province, May 22, 1995. The 'contact rattle' was heard several times while the bird wheeled over the observer. Two Turnstones were present at the same lo[...]Article
Ben J. Koks, Auteur ; Christiane Trierweiler, Auteur ; Erik G. Visser, Auteur ; Cor Dijkstra, Auteur ; Jan Komdeur, AuteurLoss and degradation of habitat threatens many bird populations. Recent rural land-use changes in the Netherlands have led to a shift in habitat use by breeding Montagu's Harriers Circus pygargus. Since the 1990s, unprecedented numbers of this s[...]Article
Raymond Klaassen, Auteur ; Almut E. Schlaich, Auteur ; Willem Bouten, Auteur ; Christiaan Both, Auteur ; Ben J. Koks, AuteurA small breeding population (3-5 pairs) of Hen Harriers recently established in the east of the province of Groningen, the Netherlands, in large scale arable farmland. We equipped three adults, two males and one female, with UvA-BiTS GPS loggers[...]Article
Raymond H. G. Klaassen, Auteur ; Almut E. Schlaich, Auteur ; Willem Bouten, Auteur ; Ben J. Koks, AuteurTime budgets are a powerful but hitherto seldom used way to study how migrants organise their bi-annual travels. We studied daily time budgets of travelling Montagu's harriers Circus pygargus, based on GPS tracking data, in which we were particu[...]Article
Christiane Trierweiler, Auteur ; Ben J. Koks, Auteur ; Rudi H. Drent, Auteur ; Klaus-Michael Exo, Auteur ; Jan Komdeur, Auteur ; Cor Dijkstra, Auteur ; Franz Bairlein, AuteurAutumn migration routes of two Dutch female Montagu's Harriers (Circus pygargus) were documented for the first time using satellite telemetry. Both migrated to their African wintering area-one via the Straits of Gibraltar through the Mediterrane[...]