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Simulated nitrogen deposition influences gastropod grazing in lichens
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
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2010 (English)In: Ecoscience, ISSN 1195-6860, Vol. 17, no 1, 83-89 p.Article in journal (Refereed) Published
Abstract [en]

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.
Keyword [en]
Alectoria sarmentosa, herbivory, Lobaria scrobiculata, mollusc, Platismatia glauca, Xanthoria aureola, Alectoria sarmentosa, herbivorie, Lobaria scrobiculata, mollusque, Platismatia glauca, Xanthoria aureola
National Category
Environmental Sciences
URN: urn:nbn:se:umu:diva-40354DOI: 10.2980/17-1-3331ISI: 000276173900009OAI: diva2:399403
Available from: 2011-02-22 Created: 2011-02-22 Last updated: 2012-01-16Bibliographically approved

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Johansson, OtiliaPalmqvist, Kristin
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