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More tolerant than expected: Taking into account the ability of Cladonia portentosa to cope with increased nitrogen availability in environmental policy
More tolerant than expected: Taking into account the ability of Cladonia portentosa to cope with increased nitrogen availability in environmental policy
- Source :
- Repositório Científico de Acesso Aberto de Portugal, Repositório Científico de Acesso Aberto de Portugal (RCAAP), instacron:RCAAP, Ecological Indicators
- Publication Year :
- 2020
- Publisher :
- Elsevier, 2020.
-
Abstract
- 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.<br />Investigador - Fundação para Ciência e Tecnologia (FCT) contract and the FCT projects IF/00964/2013 and UID/BIA/00329/2013 (2015–2018).
- Subjects :
- 0106 biological sciences
Proteomics
General Decision Sciences
chemistry.chemical_element
Algal ultrastructure
Critical loads and levels
Long-term exposure
Physiological response
Photosynthetic parameters
010501 environmental sciences
Photosynthesis
010603 evolutionary biology
01 natural sciences
Isotopic signature
Ecosystem
Lichen
Bog
Ecology, Evolution, Behavior and Systematics
0105 earth and related environmental sciences
geography
geography.geographical_feature_category
Ecology
biology
Chemistry
Photosynthetic parameter
biology.organism_classification
Nitrogen
Deposition (aerosol physics)
13. Climate action
Environmental chemistry
Critical loads and level
Cladonia portentosa
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Repositório Científico de Acesso Aberto de Portugal, Repositório Científico de Acesso Aberto de Portugal (RCAAP), instacron:RCAAP, Ecological Indicators
- Accession number :
- edsair.doi.dedup.....9efc1ec4d95ae381f45aa63cadb08b73