• Publications
  • Influence
Dispersal and migratory movements of Eiders Somateria mollissima breeding in The Netherlands
Etude de l'attachement au site de reproduction et de la dispersion chez Somateria mollissima. La repartition spatiale des individus morts et de recaptures d'individus bagues est analysee. De plus,Expand
Determinate laying and egg attendance in Common Eiders
Early egg attendance, fasting during incubation, and leaves during night hours will have evolved for clutch protection, and egg loss during inattentive periods was 80 times higher than during attendance. Expand
Diving speed and food-size selection in common guillemots, Uria aalgae
Abstract Results of choice experiments showed that guillemots Uria aalge prefer sprats Sprattus sprattus of a body depth of 16 to 17 mm. This is notably smaller than the maximum size that guillemotsExpand
On a collection of Opisthobranchia from Turkey
The collection is rather small, comprising 25 species, which is probably only a fraction of the total Opisthobranchiate fauna of Turkey, but examination of the collection yielded some surprising facts. Expand
Occurence and biology of the trematodes cotylurus (ichthycotylurus) erraticus, C. (I.) variegatus and C. (I.) platycephalus (digenea: strigeidae) in the Netherlands
The distribution of the first intermediate host (Valvata piscinalis) makes the cercariae to be limited to large fresh water bodies, especially in fishers from the IJsselmeer, a freshwater lake, newly formed after closing of the Zuiderzee in 1932. Expand
Species Selection Favors Dispersive Life Histories in Sea Slugs, but Higher Per-Offspring Investment Drives Shifts to Short-Lived Larvae.
Positive links between development mode and evolutionary rates are tested using likelihood-based methods and a phylogeny of 202 species of gastropod molluscs in Sacoglossa, a clade of herbivorous sea slugs, which shows species selection can explain the long-term persistence of planktotrophy, the ancestral state in most clades, despite frequent transitions to lecithotrophs. Expand
Differences in bill form of the oystercatcher haematopus ostralegus; a dynamic adaptation to specific foraging techniques
Age- and sex-dependent differences in bill length and form, together with the ability of the individual to adapt bill form and feeding behaviour, enable the oystercatcher to lessen interspecific competition and to respond to changing environmental conditions. Expand
Ecology and population dynamics of the common eider in the Dutch Wadden Sea
Eiders Somateria mollissima have expanded their range and their numbers have increased dramatically during the last two centuries. This study analyses the situation for Eiders in The Netherlands.Expand