BEKHUIS J (1982) Cooperating Organizations Bird Research Netherlands. Point-transect censuses of winter birds. LIMOSA 55 (2): 63-64.

The Point - transect - Counts - Project (PTT project) is used to prevent birds in different areas or in different years with each to compare. The project has not fixed bye to which species occur in a particular area and how large their number is. It is not necessary to have to have absolute numbers. A number in a certain fixed proportion to the actual number present, does this. Such a relative value can determine with relative inventory methods, which includes the point-transecttelling be counted. The main advantage of Such a method is that with less observation time suffice than is absolutely required inventory methods, which are designed the numbers as accurately as possible to determine. A point-transect count can be defined as a sample. A selected number of counting sensors each of which according to certain rules counted. Each count for each counting sensors thus provides a sample of the birds present on site. Since each participant always in the same way same finishing counting sensors, the results themselves are compared. Yerschillen may include be attributed to changes that had occurred the numbers of birds. In the Netherlands the interest of the vogeltellers focused on breeding and wintering waterfowl and raptors. Most of bverwinterende land birds such as thrushes, crows and finches are rarely involved in inventories. answered is to for this latter group Soyons / COY the PIT-organized project for winter birds. By through this project will seek to better understand gain in number and distribution of fluctuations in these species. By Soyons / COY method used is derived from Sweden. After some minor changes in the Swedish design in December 1978 and December 1979 censuses conducted to test the rules tune to the Dutch situation. The winter 1980/81, the project started. The intention that a participant once elected counting sensors PEEI as possible for years counts. =- 3r winter counts three distinguished, namely In mid November, the second half of December and mid-February. The main objective of the PIT project consists of the changes winter winter study. After being results of the count in the second half of December is used. One can already participate in this project exclusively by that time to count. The other two are important for the telperiodes second goal of the project, namely the study the number of response during a winter. By aile to the three counts to participate may also This second goal will be answered. During a census, each participant a fixed series counting sensors on his behalf. Such a series counting sensors puntentransect is called. A puntentransect consists of 20 items chosen by the counter, which for each count to be re ge'inventariseerd. Each point is counted after five minutes per type the number of counted individuals on a form is completed. Yoor the processing of all these figures is Soyons / COY a partnership entered into with the Central Bureau of Statistics. Table 1 shows how each puntentransecten telperiode been inventoried. To date, the processing of counting data some delays. Wei are already counting results prepared for the computer and became a number calculation programs designed for data to analyze. However, a targeted development is not yet come. There will be this summer with started. The PTF project should be considered as a long-term project, the more years the counts be maintained for more value, the results. It is aimed at sharing aile of the land in the project. After two telseizoenen shows that especially in the provinces of Friesland, Zeeland and North Brabant is the number of participants lies far below the desirable. In particular, the birders In those provinces, we call to participate do. But you also interested in other parts of the country we would ask to

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