Beekman, Jan H
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1991: Wildfowl Special Issue No. 1 - SECTION TWO: POPULATION STUDIES
Between year variation and causes of mortality in the non-breeding population of the Mute Swan Cygnus olor in the Netherlands, with special reference to hunting
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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 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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1991: Wildfowl Special Issue No. 1 - SECTION SIX: BIOMETRICS, PHYSIOLOGY AND GENETICS
Laying date and clutch size in relation to body weight in the Mute Swan Cygnus olor
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1991: Wildfowl Special Issue No. 1 - SECTION SIX: BIOMETRICS, PHYSIOLOGY AND GENETICS
Growth and biometry of Mute Swan Cygnus olor cygnets in Groningen, the Netherlands
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1991: Wildfowl Special Issue No. 1 - SECTION SEVEN: MANAGEMENT AND CONSERVATION
Models of swan population dynamics and growth - a review
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