Early Successional Stages of ReedPhragmites australisVegetations and Its Importance for the Bearded ReedlingPanurus biarmicusin Oostvaardersplassen, The Netherlands

摘要: A study on Bearded Reedling Panurus biarmicus feeding habits in combination with a sample-wise breeding bird survey of the marshland zones Dutch wetland Oostvaardersplassen shows clear-cut spatial differences densities and habitat use. The more mature stands Reed Phragmites australis constitute main nesting area, while open, younger stands, particularly when inundated grazed by moulting Greylag Geese, provide areas. Arthropod, especially Chironomid, were generally higher frequent flights carried out parent birds between ungrazed parts area during chick raising. Chironomids also proved to prey items brought nests. Apart from better detectability as well accessibility lower vegetation layers are likely contribute preference insect-feeding Reedlings. When winter shift seeds, patches seed index hold birds. drops below certain level, density is low independent index. highest production associated rejuvenated recovering previous grazing. Reedlings thus highly depend early successional stages stands. Temporal diversification mediated changing water levels rejuvenation caused grazing geese. number other species this type vegetation, management should therefore aim at favouring natural processes governing succession.