Seasonal changes in photosynthesis and biochemical composition in Arctic macroalgae undergoing a climatic transition
Seasonal physiology of the algal community in Kongsfjorden sublittoral ecosystem is expected to be affected by Global Climate Change. We characterized the photosynthetic performance (by means of chlorophyll a fluorescence, O2 evolution and 14C fixation) and biochemical composition (pigments, soluble...
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ftunivmalaga:oai:riuma.uma.es:10630/23415 2023-11-12T04:12:17+01:00 Seasonal changes in photosynthesis and biochemical composition in Arctic macroalgae undergoing a climatic transition Carmona-Fernández, Raquel Íñiguez, Concepción Jiménez, Carlos Gordo, Elisa Cañete-Hidalgo, Sergio Andrés Macías, Manuel López-Gordillo, Francisco Javier 2021-11-02 https://hdl.handle.net/10630/23415 eng eng Svalbard Science Conference Oslo, Noruega Noviembre 2021 https://hdl.handle.net/10630/23415 info:eu-repo/semantics/openAccess Clima - Cambios - Aspectos ambientales Macroalgas - Ártico Arctic Climate change Macroalgae Photosynthesis Seasonality info:eu-repo/semantics/conferenceObject 2021 ftunivmalaga 2023-10-24T23:13:53Z Seasonal physiology of the algal community in Kongsfjorden sublittoral ecosystem is expected to be affected by Global Climate Change. We characterized the photosynthetic performance (by means of chlorophyll a fluorescence, O2 evolution and 14C fixation) and biochemical composition (pigments, soluble carbohydrates and proteins, lipids and total C and N) of five common macroalgae of Kongsfjorden, from early autumn 2016 to late summer 2017. The studied species were Saccharina latissima and Alaria esculenta (ochrophytes), Phycodrys rubens and Ptilota gunneri (rhodophytes), and Monostroma aff. arcticum (chlorophyte, not present in March). Fluorescence results endorse the previously reported higher values of maximum quantum yield (Fv/Fm) and electron transport rates (ETRmax) in brown and green species than in red ones. In addition, a decrease in ETRmax and lower saturation irradiances in brown and green algae in summer suggest more sensitivity to continuous irradiation than in red ones. Photosynthetic parameters calculated from O2 measurements show that brown species have a better photosynthetic performance in March in response to increasing irradiance, while red and green species did in September. In general, 14C fixation was higher in September, except for A. esculenta (in March). The loss of photosynthetic capacity in summer could be attributed to a decrease in pigment concentration, except for M. arcticum. Composition also varied: in summer, under continuous illumination, brown and green species accumulated more soluble carbohydrates, while rhodophytes did in early autumn. In most species lipids had minimum values in March and proteins did not show a clear temporal pattern. In general, high N content in March and high C content in August reveal a seasonal pattern in elemental composition, related to nutrient and light availability along the year. Seasonal responses are species-specific and likely related to their particular adaptive features to the Arctic environment. Universidad de Málaga. Campus de Excelencia ... Conference Object Arctic Climate change Kongsfjord* Kongsfjorden RIUMA - Repositorio Institucional de la Universidad de Málaga Arctic |
institution |
Open Polar |
collection |
RIUMA - Repositorio Institucional de la Universidad de Málaga |
op_collection_id |
ftunivmalaga |
language |
English |
topic |
Clima - Cambios - Aspectos ambientales Macroalgas - Ártico Arctic Climate change Macroalgae Photosynthesis Seasonality |
spellingShingle |
Clima - Cambios - Aspectos ambientales Macroalgas - Ártico Arctic Climate change Macroalgae Photosynthesis Seasonality Carmona-Fernández, Raquel Íñiguez, Concepción Jiménez, Carlos Gordo, Elisa Cañete-Hidalgo, Sergio Andrés Macías, Manuel López-Gordillo, Francisco Javier Seasonal changes in photosynthesis and biochemical composition in Arctic macroalgae undergoing a climatic transition |
topic_facet |
Clima - Cambios - Aspectos ambientales Macroalgas - Ártico Arctic Climate change Macroalgae Photosynthesis Seasonality |
description |
Seasonal physiology of the algal community in Kongsfjorden sublittoral ecosystem is expected to be affected by Global Climate Change. We characterized the photosynthetic performance (by means of chlorophyll a fluorescence, O2 evolution and 14C fixation) and biochemical composition (pigments, soluble carbohydrates and proteins, lipids and total C and N) of five common macroalgae of Kongsfjorden, from early autumn 2016 to late summer 2017. The studied species were Saccharina latissima and Alaria esculenta (ochrophytes), Phycodrys rubens and Ptilota gunneri (rhodophytes), and Monostroma aff. arcticum (chlorophyte, not present in March). Fluorescence results endorse the previously reported higher values of maximum quantum yield (Fv/Fm) and electron transport rates (ETRmax) in brown and green species than in red ones. In addition, a decrease in ETRmax and lower saturation irradiances in brown and green algae in summer suggest more sensitivity to continuous irradiation than in red ones. Photosynthetic parameters calculated from O2 measurements show that brown species have a better photosynthetic performance in March in response to increasing irradiance, while red and green species did in September. In general, 14C fixation was higher in September, except for A. esculenta (in March). The loss of photosynthetic capacity in summer could be attributed to a decrease in pigment concentration, except for M. arcticum. Composition also varied: in summer, under continuous illumination, brown and green species accumulated more soluble carbohydrates, while rhodophytes did in early autumn. In most species lipids had minimum values in March and proteins did not show a clear temporal pattern. In general, high N content in March and high C content in August reveal a seasonal pattern in elemental composition, related to nutrient and light availability along the year. Seasonal responses are species-specific and likely related to their particular adaptive features to the Arctic environment. Universidad de Málaga. Campus de Excelencia ... |
format |
Conference Object |
author |
Carmona-Fernández, Raquel Íñiguez, Concepción Jiménez, Carlos Gordo, Elisa Cañete-Hidalgo, Sergio Andrés Macías, Manuel López-Gordillo, Francisco Javier |
author_facet |
Carmona-Fernández, Raquel Íñiguez, Concepción Jiménez, Carlos Gordo, Elisa Cañete-Hidalgo, Sergio Andrés Macías, Manuel López-Gordillo, Francisco Javier |
author_sort |
Carmona-Fernández, Raquel |
title |
Seasonal changes in photosynthesis and biochemical composition in Arctic macroalgae undergoing a climatic transition |
title_short |
Seasonal changes in photosynthesis and biochemical composition in Arctic macroalgae undergoing a climatic transition |
title_full |
Seasonal changes in photosynthesis and biochemical composition in Arctic macroalgae undergoing a climatic transition |
title_fullStr |
Seasonal changes in photosynthesis and biochemical composition in Arctic macroalgae undergoing a climatic transition |
title_full_unstemmed |
Seasonal changes in photosynthesis and biochemical composition in Arctic macroalgae undergoing a climatic transition |
title_sort |
seasonal changes in photosynthesis and biochemical composition in arctic macroalgae undergoing a climatic transition |
publishDate |
2021 |
url |
https://hdl.handle.net/10630/23415 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Kongsfjord* Kongsfjorden |
genre_facet |
Arctic Climate change Kongsfjord* Kongsfjorden |
op_relation |
Svalbard Science Conference Oslo, Noruega Noviembre 2021 https://hdl.handle.net/10630/23415 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1782330903382458368 |