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Thermal traits for reproduction and recruitment differ between Arctic and Atlantic kelp Laminaria digitata

The plasticity of different kelp populations to heat stress has seldom been investigated excluding environmental effects due to thermal histories, by raising a generation under common garden conditions. Comparisons of populations in the absence of environmental effects allow unbiased quantification...

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Autores principales: Martins, Neusa, Pearson, Gareth A., Bernard, Julien, Serrão, Ester A., Bartsch, Inka
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7326501/
https://www.ncbi.nlm.nih.gov/pubmed/32604405
http://dx.doi.org/10.1371/journal.pone.0235388
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author Martins, Neusa
Pearson, Gareth A.
Bernard, Julien
Serrão, Ester A.
Bartsch, Inka
author_facet Martins, Neusa
Pearson, Gareth A.
Bernard, Julien
Serrão, Ester A.
Bartsch, Inka
author_sort Martins, Neusa
collection PubMed
description The plasticity of different kelp populations to heat stress has seldom been investigated excluding environmental effects due to thermal histories, by raising a generation under common garden conditions. Comparisons of populations in the absence of environmental effects allow unbiased quantification of the meta-population adaptive potential and resolution of population-specific differentiation. Following this approach, we tested the hypothesis that genetically distinct arctic and temperate kelp exhibit different thermal phenotypes, by comparing the capacity of their microscopic life stages to recover from elevated temperatures. Gametophytes of Laminaria digitata (Arctic and North Sea) grown at 15°C for 3 years were subjected to common garden conditions with static or dynamic (i.e., gradual) thermal treatments ranging between 15 and 25°C and also to darkness. Gametophyte growth and survival during thermal stress conditions, and subsequent sporophyte recruitment at two recovery temperatures (5 and 15°C), were investigated. Population-specific responses were apparent; North Sea gametophytes exhibited higher growth rates and greater sporophyte recruitment than those from the Arctic when recovering from high temperatures, revealing differential thermal adaptation. All gametophytes performed poorly after recovery from a static 8-day exposure at 22.5°C compared to the response under a dynamic thermal treatment with a peak temperature of 25°C, demonstrating the importance of gradual warming and/or acclimation time in modifying thermal limits. Recovery temperature markedly affected the capacity of gametophytes to reproduce following high temperatures, regardless of the population. Recovery at 5°C resulted in higher sporophyte production following a 15°C and 20°C static exposure, whereas recovery at 15°C was better for gametophyte exposures to static 22.5°C or dynamic heat stress to 25°C. The subtle performance differences between populations originating from sites with contrasting local in situ temperatures support our hypothesis that their thermal plasticity has diverged over evolutionary time scales.
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spelling pubmed-73265012020-07-10 Thermal traits for reproduction and recruitment differ between Arctic and Atlantic kelp Laminaria digitata Martins, Neusa Pearson, Gareth A. Bernard, Julien Serrão, Ester A. Bartsch, Inka PLoS One Research Article The plasticity of different kelp populations to heat stress has seldom been investigated excluding environmental effects due to thermal histories, by raising a generation under common garden conditions. Comparisons of populations in the absence of environmental effects allow unbiased quantification of the meta-population adaptive potential and resolution of population-specific differentiation. Following this approach, we tested the hypothesis that genetically distinct arctic and temperate kelp exhibit different thermal phenotypes, by comparing the capacity of their microscopic life stages to recover from elevated temperatures. Gametophytes of Laminaria digitata (Arctic and North Sea) grown at 15°C for 3 years were subjected to common garden conditions with static or dynamic (i.e., gradual) thermal treatments ranging between 15 and 25°C and also to darkness. Gametophyte growth and survival during thermal stress conditions, and subsequent sporophyte recruitment at two recovery temperatures (5 and 15°C), were investigated. Population-specific responses were apparent; North Sea gametophytes exhibited higher growth rates and greater sporophyte recruitment than those from the Arctic when recovering from high temperatures, revealing differential thermal adaptation. All gametophytes performed poorly after recovery from a static 8-day exposure at 22.5°C compared to the response under a dynamic thermal treatment with a peak temperature of 25°C, demonstrating the importance of gradual warming and/or acclimation time in modifying thermal limits. Recovery temperature markedly affected the capacity of gametophytes to reproduce following high temperatures, regardless of the population. Recovery at 5°C resulted in higher sporophyte production following a 15°C and 20°C static exposure, whereas recovery at 15°C was better for gametophyte exposures to static 22.5°C or dynamic heat stress to 25°C. The subtle performance differences between populations originating from sites with contrasting local in situ temperatures support our hypothesis that their thermal plasticity has diverged over evolutionary time scales. Public Library of Science 2020-06-30 /pmc/articles/PMC7326501/ /pubmed/32604405 http://dx.doi.org/10.1371/journal.pone.0235388 Text en © 2020 Martins et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Martins, Neusa
Pearson, Gareth A.
Bernard, Julien
Serrão, Ester A.
Bartsch, Inka
Thermal traits for reproduction and recruitment differ between Arctic and Atlantic kelp Laminaria digitata
title Thermal traits for reproduction and recruitment differ between Arctic and Atlantic kelp Laminaria digitata
title_full Thermal traits for reproduction and recruitment differ between Arctic and Atlantic kelp Laminaria digitata
title_fullStr Thermal traits for reproduction and recruitment differ between Arctic and Atlantic kelp Laminaria digitata
title_full_unstemmed Thermal traits for reproduction and recruitment differ between Arctic and Atlantic kelp Laminaria digitata
title_short Thermal traits for reproduction and recruitment differ between Arctic and Atlantic kelp Laminaria digitata
title_sort thermal traits for reproduction and recruitment differ between arctic and atlantic kelp laminaria digitata
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7326501/
https://www.ncbi.nlm.nih.gov/pubmed/32604405
http://dx.doi.org/10.1371/journal.pone.0235388
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