N deposition :: Sundew species

Latin name: 
Drosera spp.

Impact Type: Deposition of pollutant

Key Concerns:

Sundew (Drosera spp.) are slow growing plants naturally adapted to low nutrient supply, with the whole plant developed to obtain nitrogen by capturing small insects indicating they are generally N limited. Because of their slow growth and habit, experimental studies indicate that they may be out-competed and overgrown by Sphagnum mosses, where there is increased nitrogen deposition (Nordbakken 2000, Svensson 1995). In much of Britain, from southern Scotland southward, the critical load for Drosera spp. is exceeded (Fowler et al. 2001).

Additional Comments:                                        

In some areas of dryer lowland heath there is also concern that Drosera spp. are out-competed and overgrown by grasses when nutrient supply is larger. Death occurs due to lack of light. 

Critical Load/level: 
Habitat/ Ecosystem Type Eunis Code Critical Load/ Level Status Reliability Indication of exceedance Reference
Raised and blanket bogs D1

5-10 kg N ha-1 year-1

UNECE 2010 - Noordwijkerhout workshop reliable

Increase in vascular plants, altered growth and species composition of bryophytes, increased N in peat and peat water.

Fowler, D.; Dragosits, U.; Pitcairn, C.E.R.; Sutton, M.A.; Hall, J.; Roy, D.B.; Weidemann, A. 2001 Deposition of acidifying and eutrophying air pollutants in Scotland: Mapping critical loads, critical levels and exceedances Centre for Ecology and Hydrology report to Scottish Natural Heritage
Nordbakken, J.F. 2000 Fine-scale persistence of boreal bog plants Journal of Vegetation Science 11(2) 269-276
Redbotorstensson, P. 1994 The Demographic Consequences of Nitrogen-Fertilization of a Population of Sundew, Drosera-Rotundifolia Acta Botanica Neerlandica 43(2) 175-188
Species group: 

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