Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations
Temperature and salinity are some of the most influential abiotic parameters shaping biota in aquatic ecosystems. In recent decades, climate change has had a crucial impact on both factors—especially around the Antarctic Peninsula—with increasing air and water temperature leading to glacial melting...
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ftpubmed:oai:pubmedcentral.nih.gov:9324188 2023-05-15T13:36:39+02:00 Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations Prelle, Lara R. Schmidt, Ina Schimani, Katherina Zimmermann, Jonas Abarca, Nelida Skibbe, Oliver Juchem, Desiree Karsten, Ulf 2022-07-16 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9324188/ http://www.ncbi.nlm.nih.gov/pubmed/35886047 https://doi.org/10.3390/genes13071264 en eng MDPI http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9324188/ http://www.ncbi.nlm.nih.gov/pubmed/35886047 http://dx.doi.org/10.3390/genes13071264 © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). CC-BY Genes (Basel) Article Text 2022 ftpubmed https://doi.org/10.3390/genes13071264 2022-07-31T03:19:13Z Temperature and salinity are some of the most influential abiotic parameters shaping biota in aquatic ecosystems. In recent decades, climate change has had a crucial impact on both factors—especially around the Antarctic Peninsula—with increasing air and water temperature leading to glacial melting and the accompanying freshwater increase in coastal areas. Antarctic soft and hard bottoms are typically inhabited by microphytobenthic communities, which are often dominated by benthic diatoms. Their physiology and primary production are assumed to be negatively affected by increased temperatures and lower salinity. In this study, six representative benthic diatom strains were isolated from different aquatic habitats at King George Island, Antarctic Peninsula, and comprehensively identified based on molecular markers and morphological traits. Photosynthesis, respiration, and growth response patterns were investigated as functions of varying light availability, temperature, and salinity. Photosynthesis–irradiance curve measurements pointed to low light requirements, as light-saturated photosynthesis was reached at <70 µmol photons m(−2) s(−1). The marine isolates exhibited the highest effective quantum yield between 25 and 45 S(A) (absolute salinity), but also tolerance to lower and higher salinities at 1 S(A) and 55 S(A), respectively, and in a few cases even <100 S(A). In contrast, the limnic isolates showed the highest effective quantum yield at salinities ranging from 1 S(A) to 20 S(A). Almost all isolates exhibited high effective quantum yields between 1.5 °C and 25 °C, pointing to a broad temperature tolerance, which was supported by measurements of the short-term temperature-dependent photosynthesis. All studied Antarctic benthic diatoms showed activity patterns over a broader environmental range than they usually experience in situ. Therefore, it is likely that their high ecophysiological plasticity represents an important trait to cope with climate change in the Antarctic Peninsula. Text Antarc* Antarctic Antarctic Peninsula King George Island PubMed Central (PMC) Antarctic Antarctic Peninsula King George Island The Antarctic Genes 13 7 1264 |
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Article Prelle, Lara R. Schmidt, Ina Schimani, Katherina Zimmermann, Jonas Abarca, Nelida Skibbe, Oliver Juchem, Desiree Karsten, Ulf Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations |
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Article |
description |
Temperature and salinity are some of the most influential abiotic parameters shaping biota in aquatic ecosystems. In recent decades, climate change has had a crucial impact on both factors—especially around the Antarctic Peninsula—with increasing air and water temperature leading to glacial melting and the accompanying freshwater increase in coastal areas. Antarctic soft and hard bottoms are typically inhabited by microphytobenthic communities, which are often dominated by benthic diatoms. Their physiology and primary production are assumed to be negatively affected by increased temperatures and lower salinity. In this study, six representative benthic diatom strains were isolated from different aquatic habitats at King George Island, Antarctic Peninsula, and comprehensively identified based on molecular markers and morphological traits. Photosynthesis, respiration, and growth response patterns were investigated as functions of varying light availability, temperature, and salinity. Photosynthesis–irradiance curve measurements pointed to low light requirements, as light-saturated photosynthesis was reached at <70 µmol photons m(−2) s(−1). The marine isolates exhibited the highest effective quantum yield between 25 and 45 S(A) (absolute salinity), but also tolerance to lower and higher salinities at 1 S(A) and 55 S(A), respectively, and in a few cases even <100 S(A). In contrast, the limnic isolates showed the highest effective quantum yield at salinities ranging from 1 S(A) to 20 S(A). Almost all isolates exhibited high effective quantum yields between 1.5 °C and 25 °C, pointing to a broad temperature tolerance, which was supported by measurements of the short-term temperature-dependent photosynthesis. All studied Antarctic benthic diatoms showed activity patterns over a broader environmental range than they usually experience in situ. Therefore, it is likely that their high ecophysiological plasticity represents an important trait to cope with climate change in the Antarctic Peninsula. |
format |
Text |
author |
Prelle, Lara R. Schmidt, Ina Schimani, Katherina Zimmermann, Jonas Abarca, Nelida Skibbe, Oliver Juchem, Desiree Karsten, Ulf |
author_facet |
Prelle, Lara R. Schmidt, Ina Schimani, Katherina Zimmermann, Jonas Abarca, Nelida Skibbe, Oliver Juchem, Desiree Karsten, Ulf |
author_sort |
Prelle, Lara R. |
title |
Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations |
title_short |
Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations |
title_full |
Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations |
title_fullStr |
Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations |
title_full_unstemmed |
Photosynthetic, Respirational, and Growth Responses of Six Benthic Diatoms from the Antarctic Peninsula as Functions of Salinity and Temperature Variations |
title_sort |
photosynthetic, respirational, and growth responses of six benthic diatoms from the antarctic peninsula as functions of salinity and temperature variations |
publisher |
MDPI |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9324188/ http://www.ncbi.nlm.nih.gov/pubmed/35886047 https://doi.org/10.3390/genes13071264 |
geographic |
Antarctic Antarctic Peninsula King George Island The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula King George Island The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula King George Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula King George Island |
op_source |
Genes (Basel) |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9324188/ http://www.ncbi.nlm.nih.gov/pubmed/35886047 http://dx.doi.org/10.3390/genes13071264 |
op_rights |
© 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
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CC-BY |
op_doi |
https://doi.org/10.3390/genes13071264 |
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Genes |
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13 |
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7 |
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1264 |
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1766082041031426048 |