Impact Type: Deposition of pollutant
Ferns may be susceptible to damage by acid deposition which can inhibit reproduction (spore germination)(Ashenden et al. 1990 , Bosley et al. 1998, Conway 1949, and Lawrence & Ashenden 1993. Below pH 3.5 negative effects on spore germination in Polypodium interjection, Dryopteris affinis and Phyllitis scolopendrium have been observed.
It is possible that Dryopteris affinis is less susceptible to acid deposition compared to other fern species (Lawrence & Ashenden 1993). Acid deposition may confer a positive advantage to bracken in competition with other species since it favours vegetative propagation via underground rhizomes.
|Critical Load/ Level|
No estimate available