Dirksen, Sjoerd
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Wildfowl 36 - Articles
Population size and breeding success of Bewick's Swans wintering in Europe in 1983-4
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Wildfowl 62 - Standard Papers
Habitat use, disturbance and collision risks for Bewick
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1991: Wildfowl Special Issue No. 1 - SECTION TWO: POPULATION STUDIES
Population size, breeding success and distribution of Bewick's Swans Cygnus columbianus bewickii wintering in Europe in 1986-87
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1991: Wildfowl Special Issue No. 1 - SECTION FOUR: MIGRATION
Scandinavian/Baltic Mute Swans Cygnus olor in the Netherlands: movements under the influence of severe winter weather and their consequences
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1991: Wildfowl Special Issue No. 1 - SECTION FIVE: HABITATS, FOOD AND FEEDING
Bewick’s Swans Cygnus columbianus bewickii in the Netherlands: numbers, distribution and food choice during the wintering season
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1991: Wildfowl Special Issue No. 1 - SECTION FIVE: HABITATS, FOOD AND FEEDING
Bewick's Swan Cygnus columbianus bewickii utilising the changing resource of Potamogeton pectinatus during autumn in the Netherlands
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