Simulated nitrogen deposition influences gastropod grazing in lichens
2010 (English)In: Ecoscience, ISSN 1195-6860, Vol. 17, no 1, 83-89 p.Article in journal (Refereed) Published
Lichens are often important photosynthetic organisms in oligotrophic environments where high-quality fodder plants are rare. A strong herbivore defence and/or low nutritional quality allows the accumulation of a high lichen biomass in such areas. However, it is not known how N deposition influences lichen palatability. This study analyzes possible changes in gastropod grazing preference after 3 months simulated N deposition on 3 foliose (Lobaria scrobiculata, Platismatia glauca, and Xanthoria aureola) and 1 pendulous lichen species (Alectoria sarmentosa). Lichens were daily irrigated in the field with rainwater containing 1.625 mM NH4NO3 from June to September, equivalent to a deposition of 50 kg N·ha-1·y-1. Irrigations applied at night, morning, or noon simulated different C-gain regimes. Afterwards in the lab, we offered 2 common lichen-feeding gastropods the choice between N-fertilized thalli and control thalli irrigated with artificial rainwater. The gastropods clearly preferred the unfertilized thalli of the 3 foliose species. For the pendulous A. sarmentosa, the gastropods preferred N-enriched thalli (irrigated at night) to controls. In conclusion, N-enrichment changes the palatability of lichens in species-specific ways.
Place, publisher, year, edition, pages
2010. Vol. 17, no 1, 83-89 p.
Alectoria sarmentosa, herbivory, Lobaria scrobiculata, mollusc, Platismatia glauca, Xanthoria aureola, Alectoria sarmentosa, herbivorie, Lobaria scrobiculata, mollusque, Platismatia glauca, Xanthoria aureola
IdentifiersURN: urn:nbn:se:umu:diva-40354DOI: 10.2980/17-1-3331ISI: 000276173900009OAI: oai:DiVA.org:umu-40354DiVA: diva2:399403