N deposition :: Atlantic lejeunea

Latin name: 
Lejeunea mandonii

Impact Type: Deposition of pollutant

Key Concerns:

This rare species is listed under the UK Biodiversity Action Plan (BAP) and occurs on shaded basic, dry habitants in humid locations such as atlantic woodlands. It frequently grows in association with other bryophytes such as Frullania spp and other Lejeunia spp, and may be sensitive to atmospheric nitrogen deposition, which would alter the competitive balance between species.

Additional Comments:

There are no known experimental studies on this species. In the absence of further information the critical load for deciduous woodland is most appropriate, although the species may be more sensitive than this overall habitat. This species occurs in basic rather than acidic locations, and will be less affected by the acidifying effects of N deposition. The UK is the most recorded occurrence of Atlantic lejeunea. 

Critical Load/level: 
Habitat/ Ecosystem Type Eunis Code Critical Load/ Level Status Reliability Indication of exceedance Reference
Broadleaved deciduous woodland G1

10-20 kg N ha-1 year-1

UNECE 2010 - Noordwijkerhout workshop reliable

Changes in soil processes, nutrient imbalance, altered composition mycorrhiza and ground vegetation.

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References: 

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