MIRANDA JF DE & R. K. KOENEKOOP RK (1980) Seabirds in The Netherlands in 1977. LIMOSA 53 (2): 59-69.

This is the second ornithological report of the "Seabirdmigration- observation Club" (CvZ). This report gives an outline of the passage and presence of birds along the Dutch coast. The observations were made at regular spots along the Dutch coast including the North Sea coast of the Frisian isles in the Dutch Waddensea, registered on printed "hourly total cards" and stored in files of the CvZ. For members of the CvZ two halfyear reports were published (van Dijk 1977 a, b) in which the observations of 1977 were worked out and discussed in detail. In preparing this paper these two reports were used as the main source of information. This report has been extended in four important aspects compared with the 1976 report (de Miranda 1978). First of all we have tried to achieve completeness in selecting species to be discussed. The families of primary seabirds (Tuck & Heinzel 1978) which were represented by one or more species along the Dutch coast, were taken into account as a whole. For instance the Sternidae represented along the coast by a number of tern species are treated as a whole by treating all the tern species seen during 1977 in The Netherlands. So Caspian, Whiskered and White-winged Black Tern (usually typical "inland" species) are discussed as well. The secondary sea- treated. Finally those remaining species which are not "real" seabirds but which are often encountered as migrants along the coast, are taken into account, e.g. Shellduck, Red breasted Merganser, some species of shore birds and others. Second addition is the mentioning of the size of some of the Dutch breeding populations; these birds are marked with a B. Third addition concerns the numbers of dead birds collected along the Dutch coast. If possible the amount of birds with or without external oil is mentioned as well as the occurrence distribution in months of the year. The final addition involves a detailed survey of birds staying along the Dutch coast during January 8 and 9 (Meininger 1978). Interpretation of the collected data must be done in view of the fact that the number of watching hours at the different stations and during different months of the year is not evenly spread out. Only the very evident "double counts" of observations close together during the same time, are omitted. In addition to the discussion of the species, an hourly frequency distribution table, where needed, is included. The class represents the number of individuals of the given species passing in one hour. The frequency in which this hourly total occurs is mentioned separately for the first half year (from Jan-June) and second half year (from July-Dec) as well as for HB (Hondsbossche Zeewering) and ZH (Coast of Holland south of IJmuiden).

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