Growth Resilience of Subarctic Rhodoliths ( Lithothamnion glaciale, Rhodophyta) to Chronic Low Sea Temperature and irradiance
Rhodolith beds are pervasive marine biological systems in the subarctic North Atlantic. Limited knowledge about effects of temperature and irradiance on rhodolith growth limits the ability to anticipate the response of rhodolith beds to this ocean's chronic low, yet changing sea temperature and...
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crwiley:10.1111/jpy.13231 2024-06-23T07:54:48+00:00 Growth Resilience of Subarctic Rhodoliths ( Lithothamnion glaciale, Rhodophyta) to Chronic Low Sea Temperature and irradiance Arnold, Cassidy L. Bélanger, David Gagnon, Patrick Pfister, C. Research and Development Corporation of Newfoundland and Labrador Natural Sciences and Engineering Research Council of Canada Canada Foundation for Innovation 2022 http://dx.doi.org/10.1111/jpy.13231 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jpy.13231 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jpy.13231 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Phycology volume 58, issue 2, page 251-266 ISSN 0022-3646 1529-8817 journal-article 2022 crwiley https://doi.org/10.1111/jpy.13231 2024-06-13T04:21:34Z Rhodolith beds are pervasive marine biological systems in the subarctic North Atlantic. Limited knowledge about effects of temperature and irradiance on rhodolith growth limits the ability to anticipate the response of rhodolith beds to this ocean's chronic low, yet changing sea temperature and irradiance regimes. We carried out a 149‐d laboratory experiment with Newfoundland Lithothamnion glaciale rhodoliths to test the predictions that growth (i) is inhibited at temperatures of ~0.5°C and (ii) resumes as temperature increases above 0.5°C, albeit at a higher rate under high than low irradiances. Rhodoliths were grown in experimental tanks at near‐zero (~0.7°C) seawater temperatures during the first 85 d and at temperatures increasing naturally to ~6°C for the remaining 64 d. Rhodoliths in those tanks were exposed to either low (0.02 mol photons·m −2 ·d −1 ) or high (0.78 mol photons·m −2 ·d −1 ) irradiances during the entire experiment. Rhodoliths grew at a linear rate of ~281 μm·year −1 (0.77 μm·d −1 ) throughout the experiment under both irradiance treatments despite daily seawater temperature variation of up to 3°C. Near‐zero temperatures of ~0.5 to 1.0°C did not inhibit rhodolith growth. Model selection showed that PAR‐day (a cumulative irradiance index) was a better predictor of growth variation than Degree‐day (a cumulative thermal index). Our findings extend to ~0.5°C the lower limit of the known temperature range (~1 to at least 16°C) over which growth in L. glaciale rhodoliths remains unaffected, while suggesting that the growth–irradiance relationship in low‐light environments at temperatures below 6°C is less irradiance‐driven than recently proposed. Article in Journal/Newspaper Newfoundland North Atlantic Subarctic Wiley Online Library Journal of Phycology |
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Wiley Online Library |
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English |
description |
Rhodolith beds are pervasive marine biological systems in the subarctic North Atlantic. Limited knowledge about effects of temperature and irradiance on rhodolith growth limits the ability to anticipate the response of rhodolith beds to this ocean's chronic low, yet changing sea temperature and irradiance regimes. We carried out a 149‐d laboratory experiment with Newfoundland Lithothamnion glaciale rhodoliths to test the predictions that growth (i) is inhibited at temperatures of ~0.5°C and (ii) resumes as temperature increases above 0.5°C, albeit at a higher rate under high than low irradiances. Rhodoliths were grown in experimental tanks at near‐zero (~0.7°C) seawater temperatures during the first 85 d and at temperatures increasing naturally to ~6°C for the remaining 64 d. Rhodoliths in those tanks were exposed to either low (0.02 mol photons·m −2 ·d −1 ) or high (0.78 mol photons·m −2 ·d −1 ) irradiances during the entire experiment. Rhodoliths grew at a linear rate of ~281 μm·year −1 (0.77 μm·d −1 ) throughout the experiment under both irradiance treatments despite daily seawater temperature variation of up to 3°C. Near‐zero temperatures of ~0.5 to 1.0°C did not inhibit rhodolith growth. Model selection showed that PAR‐day (a cumulative irradiance index) was a better predictor of growth variation than Degree‐day (a cumulative thermal index). Our findings extend to ~0.5°C the lower limit of the known temperature range (~1 to at least 16°C) over which growth in L. glaciale rhodoliths remains unaffected, while suggesting that the growth–irradiance relationship in low‐light environments at temperatures below 6°C is less irradiance‐driven than recently proposed. |
author2 |
Pfister, C. Research and Development Corporation of Newfoundland and Labrador Natural Sciences and Engineering Research Council of Canada Canada Foundation for Innovation |
format |
Article in Journal/Newspaper |
author |
Arnold, Cassidy L. Bélanger, David Gagnon, Patrick |
spellingShingle |
Arnold, Cassidy L. Bélanger, David Gagnon, Patrick Growth Resilience of Subarctic Rhodoliths ( Lithothamnion glaciale, Rhodophyta) to Chronic Low Sea Temperature and irradiance |
author_facet |
Arnold, Cassidy L. Bélanger, David Gagnon, Patrick |
author_sort |
Arnold, Cassidy L. |
title |
Growth Resilience of Subarctic Rhodoliths ( Lithothamnion glaciale, Rhodophyta) to Chronic Low Sea Temperature and irradiance |
title_short |
Growth Resilience of Subarctic Rhodoliths ( Lithothamnion glaciale, Rhodophyta) to Chronic Low Sea Temperature and irradiance |
title_full |
Growth Resilience of Subarctic Rhodoliths ( Lithothamnion glaciale, Rhodophyta) to Chronic Low Sea Temperature and irradiance |
title_fullStr |
Growth Resilience of Subarctic Rhodoliths ( Lithothamnion glaciale, Rhodophyta) to Chronic Low Sea Temperature and irradiance |
title_full_unstemmed |
Growth Resilience of Subarctic Rhodoliths ( Lithothamnion glaciale, Rhodophyta) to Chronic Low Sea Temperature and irradiance |
title_sort |
growth resilience of subarctic rhodoliths ( lithothamnion glaciale, rhodophyta) to chronic low sea temperature and irradiance |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1111/jpy.13231 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jpy.13231 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jpy.13231 |
genre |
Newfoundland North Atlantic Subarctic |
genre_facet |
Newfoundland North Atlantic Subarctic |
op_source |
Journal of Phycology volume 58, issue 2, page 251-266 ISSN 0022-3646 1529-8817 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/jpy.13231 |
container_title |
Journal of Phycology |
_version_ |
1802647066418085888 |