Spectral reflectance indices sense desiccation induced changes in the thalli of Antarctic lichen Dermatocarpon polyphyllizum
Lichens, in polar and alpine regions, pass through repetitive dehydration and rehydration events over the years. The harsh environmental conditions affect the plasticity of lichen’s functional and structural features for their survival, in a species-specific way, and, thus, their optical and spectra...
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ftmasarykunivojs:oai:ojs.journals.muni.cz:article/12932 2023-05-15T13:46:41+02:00 Spectral reflectance indices sense desiccation induced changes in the thalli of Antarctic lichen Dermatocarpon polyphyllizum Barták, Miloš Mishra, Kumud Bandhu Marečková, Michaela 2018-07-01 application/pdf http://journals.muni.cz/CPR/article/view/12932 eng eng Masaryk Univerzity http://journals.muni.cz/CPR/article/view/12932/11284 http://journals.muni.cz/CPR/article/view/12932 Copyright (c) 2020 Czech Polar Reports https://creativecommons.org/licenses/by-nc-nd/4.0 CC-BY-NC-ND Czech Polar Reports; Vol 8 No 2 (2018); 249-259 Czech Polar Reports; Vol. 8 No. 2 (2018); 249-259 1805-0697 1805-0689 desiccation lichens reflectance and water index protection mechanisms survival strategy info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2018 ftmasarykunivojs 2022-06-26T10:16:39Z Lichens, in polar and alpine regions, pass through repetitive dehydration and rehydration events over the years. The harsh environmental conditions affect the plasticity of lichen’s functional and structural features for their survival, in a species-specific way, and, thus, their optical and spectral characteristics. For an understanding on how dehydration affects lichens spectral reflectance, we measured visible (VIS) and near infrared (NIR) reflectance spectra of Dermatocarpon polyphyllizum, a foliose lichen species, from James Ross Island (Antarctica), during gradual dehydration from fully wet (relative water content (RWC) = 100%) to dry state (RWC = 0%), under laboratory conditions, and compared several derived reflectance indices (RIs) to RWC. We found a curvilinear relationship between RWC and range of RIs: water index (WI), photochemical reflectance index (PRI), normalized difference vegetation index (NDVI), modified chlorophyll absorption in reflectance indices (MCARI and MCARI1), simple ratio pigment index (SRPI), normalized pigment chlorophyll index (NPCI), and a new NIR shoulder region spectral ratio index (NSRI). The index NDVI was initially increased with maxima around 70% RWC and it steadily declined with further desiccation, whereas PRI in-creased with desiccation and steeply falls when RWC was below 10%. The curvilinear relationship, for RIs versus RWC, was best fitted by polynomial regressions of second or third degree, and it was found that RWC showed very high correlation with WI (R2 = 0.94) that is followed by MCARI (R2 = 0.87), NDVI (R2 = 0.83), and MCARI (R2 = 0.81). The index NSRI, proposed for accessing structural deterioration, was almost invariable during dehydration with the least value of the coefficient of determination (R2 = 0.28). This may mean that lichen, Dermatocarpon polyphyllizum, activates protection mechanisms initially in response to the progression of dehydration; however, severe dehydration causes deactivation of photosynthesis and associated pigments without much ... Article in Journal/Newspaper Antarc* Antarctic Antarctica James Ross Island Ross Island Masaryk University Journals Antarctic Ross Island |
institution |
Open Polar |
collection |
Masaryk University Journals |
op_collection_id |
ftmasarykunivojs |
language |
English |
topic |
desiccation lichens reflectance and water index protection mechanisms survival strategy |
spellingShingle |
desiccation lichens reflectance and water index protection mechanisms survival strategy Barták, Miloš Mishra, Kumud Bandhu Marečková, Michaela Spectral reflectance indices sense desiccation induced changes in the thalli of Antarctic lichen Dermatocarpon polyphyllizum |
topic_facet |
desiccation lichens reflectance and water index protection mechanisms survival strategy |
description |
Lichens, in polar and alpine regions, pass through repetitive dehydration and rehydration events over the years. The harsh environmental conditions affect the plasticity of lichen’s functional and structural features for their survival, in a species-specific way, and, thus, their optical and spectral characteristics. For an understanding on how dehydration affects lichens spectral reflectance, we measured visible (VIS) and near infrared (NIR) reflectance spectra of Dermatocarpon polyphyllizum, a foliose lichen species, from James Ross Island (Antarctica), during gradual dehydration from fully wet (relative water content (RWC) = 100%) to dry state (RWC = 0%), under laboratory conditions, and compared several derived reflectance indices (RIs) to RWC. We found a curvilinear relationship between RWC and range of RIs: water index (WI), photochemical reflectance index (PRI), normalized difference vegetation index (NDVI), modified chlorophyll absorption in reflectance indices (MCARI and MCARI1), simple ratio pigment index (SRPI), normalized pigment chlorophyll index (NPCI), and a new NIR shoulder region spectral ratio index (NSRI). The index NDVI was initially increased with maxima around 70% RWC and it steadily declined with further desiccation, whereas PRI in-creased with desiccation and steeply falls when RWC was below 10%. The curvilinear relationship, for RIs versus RWC, was best fitted by polynomial regressions of second or third degree, and it was found that RWC showed very high correlation with WI (R2 = 0.94) that is followed by MCARI (R2 = 0.87), NDVI (R2 = 0.83), and MCARI (R2 = 0.81). The index NSRI, proposed for accessing structural deterioration, was almost invariable during dehydration with the least value of the coefficient of determination (R2 = 0.28). This may mean that lichen, Dermatocarpon polyphyllizum, activates protection mechanisms initially in response to the progression of dehydration; however, severe dehydration causes deactivation of photosynthesis and associated pigments without much ... |
format |
Article in Journal/Newspaper |
author |
Barták, Miloš Mishra, Kumud Bandhu Marečková, Michaela |
author_facet |
Barták, Miloš Mishra, Kumud Bandhu Marečková, Michaela |
author_sort |
Barták, Miloš |
title |
Spectral reflectance indices sense desiccation induced changes in the thalli of Antarctic lichen Dermatocarpon polyphyllizum |
title_short |
Spectral reflectance indices sense desiccation induced changes in the thalli of Antarctic lichen Dermatocarpon polyphyllizum |
title_full |
Spectral reflectance indices sense desiccation induced changes in the thalli of Antarctic lichen Dermatocarpon polyphyllizum |
title_fullStr |
Spectral reflectance indices sense desiccation induced changes in the thalli of Antarctic lichen Dermatocarpon polyphyllizum |
title_full_unstemmed |
Spectral reflectance indices sense desiccation induced changes in the thalli of Antarctic lichen Dermatocarpon polyphyllizum |
title_sort |
spectral reflectance indices sense desiccation induced changes in the thalli of antarctic lichen dermatocarpon polyphyllizum |
publisher |
Masaryk Univerzity |
publishDate |
2018 |
url |
http://journals.muni.cz/CPR/article/view/12932 |
geographic |
Antarctic Ross Island |
geographic_facet |
Antarctic Ross Island |
genre |
Antarc* Antarctic Antarctica James Ross Island Ross Island |
genre_facet |
Antarc* Antarctic Antarctica James Ross Island Ross Island |
op_source |
Czech Polar Reports; Vol 8 No 2 (2018); 249-259 Czech Polar Reports; Vol. 8 No. 2 (2018); 249-259 1805-0697 1805-0689 |
op_relation |
http://journals.muni.cz/CPR/article/view/12932/11284 http://journals.muni.cz/CPR/article/view/12932 |
op_rights |
Copyright (c) 2020 Czech Polar Reports https://creativecommons.org/licenses/by-nc-nd/4.0 |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766245080385978368 |