The Heliconoides Modified Dissolution Index-HMDI: Do methane seepage environments affect the preservation state of Heliconoides inflatus?
Pteropods are holoplanktonic molluscs presently endangered because their fragile aragonitic shell is very sensitive to ocean acidification. The preservation of pteropods, and in particular of the mesopelagic Heliconoides (Limacina) inflatus, has been used to assess aragonite saturation state in Quat...
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ftdoajarticles:oai:doaj.org/article:2b5b9de5a5b847fc92ff6beb6be5594d 2023-06-18T03:42:30+02:00 The Heliconoides Modified Dissolution Index-HMDI: Do methane seepage environments affect the preservation state of Heliconoides inflatus? Valentina Beccari Ahuva Almogi-Labin Daniela Basso Giuliana Panieri Yizhaq Makovsky Christoph Neururer Irka Hajdas Silvia Spezzaferri 2023-08-01T00:00:00Z https://doi.org/10.1016/j.ecolind.2023.110380 https://doaj.org/article/2b5b9de5a5b847fc92ff6beb6be5594d EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S1470160X23005228 https://doaj.org/toc/1470-160X 1470-160X doi:10.1016/j.ecolind.2023.110380 https://doaj.org/article/2b5b9de5a5b847fc92ff6beb6be5594d Ecological Indicators, Vol 152, Iss , Pp 110380- (2023) Pteropods Aragonite Dissolution Cold seeps Limacina Dissolution Index Heliconoides Modified Dissolution Index-HMDI Ecology QH540-549.5 article 2023 ftdoajarticles https://doi.org/10.1016/j.ecolind.2023.110380 2023-06-04T00:40:42Z Pteropods are holoplanktonic molluscs presently endangered because their fragile aragonitic shell is very sensitive to ocean acidification. The preservation of pteropods, and in particular of the mesopelagic Heliconoides (Limacina) inflatus, has been used to assess aragonite saturation state in Quaternary sediments (Limacina Dissolution Index, LDX) as an inferred proxy for climatic changes.Three deep-sea cores retrieved in 2016 during the EUROFLEETS2 SEMSEEP cruise offshore Israel are investigated to assess the preservation degree of H. inflatus (d'Orbigny, 1835) in representative environments across the base of the southeastern Mediterranean margin (cold water coral, active seepage pockmark and deep sea channel areas). In some core intervals, yellowish, recrystallized internal molds of this species are present. They have been previously observed in the Eastern Mediterranean, but the nature and origin of their colour was never explained. Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and Electron Backscatter Diffraction (EBSD) revealed that the recrystallized molds of the H. inflatus shells are formed by aragonite needles and high-Mg calcite crystals. The formation and preservation of these internal molds is induced by advective methane emissions, typically precipitating aragonite and High-Mg calcite phases close to the sediment–water interface. These molds were never used in previous applications of the LDX or in any existing ranking of pteropod preservation. Therefore, we have categorized these peculiar features combining previous pteropod ranking descriptions with the new observations to develop a modified biotic index (Heliconoides Modified Dissolution Index-HMDI).High values of the HMDI at the base of the pockmark core correspond to the interval where also active seepage-related features – e.g., bubble emissions, low-oxygen benthic foraminifera, chemosymbiotic molluscs, small fragments of authigenic carbonate crusts and slightly depleted δ13C values – occur, showing the ... Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Ecological Indicators 152 110380 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Pteropods Aragonite Dissolution Cold seeps Limacina Dissolution Index Heliconoides Modified Dissolution Index-HMDI Ecology QH540-549.5 |
spellingShingle |
Pteropods Aragonite Dissolution Cold seeps Limacina Dissolution Index Heliconoides Modified Dissolution Index-HMDI Ecology QH540-549.5 Valentina Beccari Ahuva Almogi-Labin Daniela Basso Giuliana Panieri Yizhaq Makovsky Christoph Neururer Irka Hajdas Silvia Spezzaferri The Heliconoides Modified Dissolution Index-HMDI: Do methane seepage environments affect the preservation state of Heliconoides inflatus? |
topic_facet |
Pteropods Aragonite Dissolution Cold seeps Limacina Dissolution Index Heliconoides Modified Dissolution Index-HMDI Ecology QH540-549.5 |
description |
Pteropods are holoplanktonic molluscs presently endangered because their fragile aragonitic shell is very sensitive to ocean acidification. The preservation of pteropods, and in particular of the mesopelagic Heliconoides (Limacina) inflatus, has been used to assess aragonite saturation state in Quaternary sediments (Limacina Dissolution Index, LDX) as an inferred proxy for climatic changes.Three deep-sea cores retrieved in 2016 during the EUROFLEETS2 SEMSEEP cruise offshore Israel are investigated to assess the preservation degree of H. inflatus (d'Orbigny, 1835) in representative environments across the base of the southeastern Mediterranean margin (cold water coral, active seepage pockmark and deep sea channel areas). In some core intervals, yellowish, recrystallized internal molds of this species are present. They have been previously observed in the Eastern Mediterranean, but the nature and origin of their colour was never explained. Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and Electron Backscatter Diffraction (EBSD) revealed that the recrystallized molds of the H. inflatus shells are formed by aragonite needles and high-Mg calcite crystals. The formation and preservation of these internal molds is induced by advective methane emissions, typically precipitating aragonite and High-Mg calcite phases close to the sediment–water interface. These molds were never used in previous applications of the LDX or in any existing ranking of pteropod preservation. Therefore, we have categorized these peculiar features combining previous pteropod ranking descriptions with the new observations to develop a modified biotic index (Heliconoides Modified Dissolution Index-HMDI).High values of the HMDI at the base of the pockmark core correspond to the interval where also active seepage-related features – e.g., bubble emissions, low-oxygen benthic foraminifera, chemosymbiotic molluscs, small fragments of authigenic carbonate crusts and slightly depleted δ13C values – occur, showing the ... |
format |
Article in Journal/Newspaper |
author |
Valentina Beccari Ahuva Almogi-Labin Daniela Basso Giuliana Panieri Yizhaq Makovsky Christoph Neururer Irka Hajdas Silvia Spezzaferri |
author_facet |
Valentina Beccari Ahuva Almogi-Labin Daniela Basso Giuliana Panieri Yizhaq Makovsky Christoph Neururer Irka Hajdas Silvia Spezzaferri |
author_sort |
Valentina Beccari |
title |
The Heliconoides Modified Dissolution Index-HMDI: Do methane seepage environments affect the preservation state of Heliconoides inflatus? |
title_short |
The Heliconoides Modified Dissolution Index-HMDI: Do methane seepage environments affect the preservation state of Heliconoides inflatus? |
title_full |
The Heliconoides Modified Dissolution Index-HMDI: Do methane seepage environments affect the preservation state of Heliconoides inflatus? |
title_fullStr |
The Heliconoides Modified Dissolution Index-HMDI: Do methane seepage environments affect the preservation state of Heliconoides inflatus? |
title_full_unstemmed |
The Heliconoides Modified Dissolution Index-HMDI: Do methane seepage environments affect the preservation state of Heliconoides inflatus? |
title_sort |
heliconoides modified dissolution index-hmdi: do methane seepage environments affect the preservation state of heliconoides inflatus? |
publisher |
Elsevier |
publishDate |
2023 |
url |
https://doi.org/10.1016/j.ecolind.2023.110380 https://doaj.org/article/2b5b9de5a5b847fc92ff6beb6be5594d |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Ecological Indicators, Vol 152, Iss , Pp 110380- (2023) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S1470160X23005228 https://doaj.org/toc/1470-160X 1470-160X doi:10.1016/j.ecolind.2023.110380 https://doaj.org/article/2b5b9de5a5b847fc92ff6beb6be5594d |
op_doi |
https://doi.org/10.1016/j.ecolind.2023.110380 |
container_title |
Ecological Indicators |
container_volume |
152 |
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110380 |
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1769008459671404544 |