Air pollution as a possible cause for the decline of some phanerogamic species in The Netherlands |
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Authors: | D van Dam H F van Dobben C F J ter Braak T de Wit |
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Institution: | (1) Research Institute for Nature Management, Postbus 46, 3956 ZR Leersum, The Netherlands |
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Abstract: | In The Netherlands the decline of some phanerogamic species cannot be readily explained from obvious factors such as lowering of the groundwater table, eutrophication or land reclamation. For a number of species the hypothesis was tested that the decline is partly due to air pollution. A two-factor model was made in which decline is accounted for by (a) habitat destruction assessed from topographic maps and (b) air pollution measured as the SO2 95-percentile over the winter period 1978/1979. Effects of both factors were assumed to follow a sigmoid dose-effect curve. For a number of species decline proved to be significantly correlated with air pollution. These are notably species from the syntaxon Violion caninae. A comparison was made with results obtained for epiphytic lichens. It appears that for some phanerogamic species sensitivity is about the same as for moderately sensitive lichens.Nomenclature follows Heukels & van der Meijden (1983).Thanks are due to the Rijksherbarium, for providing some of their unpublished data; and to Ada Groeneveld, for technical assistance. |
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Keywords: | Air pollution Decline of phanerogamic species Dose-effect model Epiphytic lichens Habitat destruction |
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