N deposition :: Irish Lady's tresses

Latin name: 
Spiranthes romanzoffiana

Impact Type: Deposition of pollutant

Key Concerns:

Irish Lady's tresses (Spiranthes romanzoffiana) is a rare orchid of boggy pastures and meadows which occurs particularly in Northern Ireland, the extreme west of Scotland and at one site in England in south Devon (Biodiversity Steering Group 1995). This UK BAP species has declined in intensive agricultural areas, probably due to eutrophication and habitat loss. Atmospheric N deposition is expected to be a contributing factor since it will increase competition from grasses and tall forbs.

Additional Comments:

There is no published research on the impact of pollution on this species. 

Critical Load/level: 
Habitat/ Ecosystem Type Eunis Code Critical Load/ Level Status Reliability Indication of exceedance Reference
Non-mediterranean dry acid and neutral closed grassland E1.7

10-15 kg N ha-1 year-1

UNECE 2010 - Noordwijkerhout workshop reliable

Increase in graminoids, decline of typical species, decrease in total species richness.

Group, Biodiversity Steering 1995 Biodiversity: the UK Steering Group report Action Plans 2
Species group: 

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