Desmids of Drenthe
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Desmids of Drenthe

In 2007 I started a survey of the desmids of the Dutch province of Drenthe. The final goal of this project is to create distribution maps of all species found in this province.

In the map (figure 1) you can see from which 1x1 km square I collected data until June 2017. Some 1x1 km squares contain several ponds, moorland pools, bog hollows and fens, while others are agricultural areas without any natural waters. As the amount of desmids in ditches, canals and other organically polluted (eutrophic) waters is normally quite low and the amount of ditches and canals in certain parts of the province is quite high,  I decided to skip those waters in the survey.
So the map of examined squares is yet far from complete, and never will be filled completely.

All sample locations

Figure 1. Al sampled 1x1 km squares in Drenthe till June 2017

In figure 2 you can see how well the 5x5 km squares are covered till June 2017. My aim is to get samples from at least three 1x1 km square per 5x5 km square (12%).  As you can see that goal is almost reached. At this moment even about 20% of the total amount of 5x5 km squares is visited.
Note: 1x1 km square  is 'kmhok' in Dutch and 5x5 km square is 'uurhok'.

All 5x5 km squares in Drenthe

Figure 2. Coverage of sample points across the province of Drenthe till June 2017

Figure 3 gives more detail about the coverage and also shows the differences between the 5x5 km squares as far as the number of taxa is concerned.

Data on 5x5 km squares 

Figure 3. Additional  information on sample points across the province of Drenthe till June 2017