Comparison of the performance of species response models in several landscape units in the province of Noord-Holland, The Netherlands

摘要: In The Netherlands, empirical statistical response models are used in the Dutch nature conservation policy to predict vegetation management options. development of is time consuming and costly, due need for databases that extensively describe biotic environmental variation research area. For this reason it important optimize sampling procedure thus reduce costs. Our aimed at finding out what extent species will improve when an gradient sampled outside range optimal a species, which may be especially relevant where presence related geographical landscape units. We tested 46 two units our area, dune polder area province Noord-Holland, if would worthwhile extend other unit. Herefore we compared predictive values based on either or subset with those combined dune/polder set. general set were not significantly higher than subsets. Thus, financial resources limited, recommend focusing attention regions interest. Extrapolation unit was also tested. Considering extreme poor predictions, advise against extrapolation different conditions.