More tolerant than expected: taking into account the ability of Cladonia portentosa to cope with increased nitrogen availability in environmental policy

Munzi, S.; Cruz, C.; Branquinho, C.; Cai, G.; Faleri, C.; Parrotta, L.; Bini, L.; Gagliardi, A.; Leith, I.D.; Sheppard, L.J.. 2020 More tolerant than expected: taking into account the ability of Cladonia portentosa to cope with increased nitrogen availability in environmental policy. Ecological Indicators, 119, 106817. 11, pp. https://doi.org/10.1016/j.ecolind.2020.106817

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Abstract/Summary

The lichen Cladonia portentosa is generally considered to be sensitive to increased environmental nitrogen (N) deposition. However, the presence of this lichen in impacted environments suggests that it can cope with prolonged exposure to high N availability. To test the tolerance of this species to N, photosynthetic parameters, carbon and N concentrations and isotopic signature, chitin concentration, surface pH and extracellular enzymatic activity were measured in samples exposed for 11 years to different N doses and forms at the Whim bog N manipulation experimental site (United Kingdom). The results showed that C. portentosa is tolerant to long-term exposure to wet N deposition, maintaining its functionality with almost unaltered physiological parameters. The comparison of the proteome of short- and long-term exposed samples showed similar changes in protein expression suggesting that mechanisms to cope with N are not dependent on the exposure time even after more than a decade. Since empirical N Critical Loads are based on the response of sensitive components of the ecosystem, like C. portentosa, its capacity to cope with short- and long-term exposure to N needs to be recognized and taken into account when setting them, likewise, the significance of the form of N.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.ecolind.2020.106817
UKCEH and CEH Sections/Science Areas:	UKCEH Fellows Unaffiliated
ISSN:	1470-160X
Additional Keywords:	algal ultrastructure, critical loads and levels, long-term exposure, physiological response, photosynthetic parameters. proteomics
NORA Subject Terms:	Ecology and Environment
Date made live:	26 Aug 2020 11:45 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/528386

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