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Effects of adaptation, chance, and history on the evolution of the toxic dinoflagellate Alexandrium minutum under selection of increased temperature and acidification

The roles of adaptation, chance, and history on evolution of the toxic dinoflagellate Alexandrium minutum Halim, under selective conditions simulating global change, have been addressed. Two toxic strains (AL1V and AL2V), previously acclimated for two years at pH 8.0 and 20°C, were transferred to se...

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Autores principales: Flores-Moya, Antonio, Rouco, Mónica, García-Sánchez, María Jesús, García-Balboa, Camino, González, Raquel, Costas, Eduardo, López-Rodas, Victoria
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Blackwell Publishing Ltd 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3402198/
https://www.ncbi.nlm.nih.gov/pubmed/22833798
http://dx.doi.org/10.1002/ece3.198
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author Flores-Moya, Antonio
Rouco, Mónica
García-Sánchez, María Jesús
García-Balboa, Camino
González, Raquel
Costas, Eduardo
López-Rodas, Victoria
author_facet Flores-Moya, Antonio
Rouco, Mónica
García-Sánchez, María Jesús
García-Balboa, Camino
González, Raquel
Costas, Eduardo
López-Rodas, Victoria
author_sort Flores-Moya, Antonio
collection PubMed
description The roles of adaptation, chance, and history on evolution of the toxic dinoflagellate Alexandrium minutum Halim, under selective conditions simulating global change, have been addressed. Two toxic strains (AL1V and AL2V), previously acclimated for two years at pH 8.0 and 20°C, were transferred to selective conditions: pH 7.5 to simulate acidification and 25°C. Cultures under selective conditions were propagated until growth rate and toxin cell quota achieved an invariant mean value at 720 days (ca. 250 and ca. 180 generations for strains AL1V and AL2V, respectively). Historical contingencies strongly constrained the evolution of growth rate and toxin cell quota, but the forces involved in the evolution were not the same for both traits. Growth rate was 1.5–1.6 times higher than the one measured in ancestral conditions. Genetic adaptation explained two-thirds of total adaptation while one-third was a consequence of physiological adaptation. On the other hand, the evolution of toxin cell quota showed a pattern attributable to neutral mutations because the final variances were significantly higher than those measured at the start of the experiment. It has been hypothesized that harmful algal blooms will increase under the future scenario of global change. Although this study might be considered an oversimplification of the reality, it can be hypothesized that toxic blooms will increase but no predictions can be advanced about toxicity.
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spelling pubmed-34021982012-07-25 Effects of adaptation, chance, and history on the evolution of the toxic dinoflagellate Alexandrium minutum under selection of increased temperature and acidification Flores-Moya, Antonio Rouco, Mónica García-Sánchez, María Jesús García-Balboa, Camino González, Raquel Costas, Eduardo López-Rodas, Victoria Ecol Evol Original Research The roles of adaptation, chance, and history on evolution of the toxic dinoflagellate Alexandrium minutum Halim, under selective conditions simulating global change, have been addressed. Two toxic strains (AL1V and AL2V), previously acclimated for two years at pH 8.0 and 20°C, were transferred to selective conditions: pH 7.5 to simulate acidification and 25°C. Cultures under selective conditions were propagated until growth rate and toxin cell quota achieved an invariant mean value at 720 days (ca. 250 and ca. 180 generations for strains AL1V and AL2V, respectively). Historical contingencies strongly constrained the evolution of growth rate and toxin cell quota, but the forces involved in the evolution were not the same for both traits. Growth rate was 1.5–1.6 times higher than the one measured in ancestral conditions. Genetic adaptation explained two-thirds of total adaptation while one-third was a consequence of physiological adaptation. On the other hand, the evolution of toxin cell quota showed a pattern attributable to neutral mutations because the final variances were significantly higher than those measured at the start of the experiment. It has been hypothesized that harmful algal blooms will increase under the future scenario of global change. Although this study might be considered an oversimplification of the reality, it can be hypothesized that toxic blooms will increase but no predictions can be advanced about toxicity. Blackwell Publishing Ltd 2012-06 /pmc/articles/PMC3402198/ /pubmed/22833798 http://dx.doi.org/10.1002/ece3.198 Text en © 2012 The Authors. Published by Blackwell Publishing Ltd.
spellingShingle Original Research
Flores-Moya, Antonio
Rouco, Mónica
García-Sánchez, María Jesús
García-Balboa, Camino
González, Raquel
Costas, Eduardo
López-Rodas, Victoria
Effects of adaptation, chance, and history on the evolution of the toxic dinoflagellate Alexandrium minutum under selection of increased temperature and acidification
title Effects of adaptation, chance, and history on the evolution of the toxic dinoflagellate Alexandrium minutum under selection of increased temperature and acidification
title_full Effects of adaptation, chance, and history on the evolution of the toxic dinoflagellate Alexandrium minutum under selection of increased temperature and acidification
title_fullStr Effects of adaptation, chance, and history on the evolution of the toxic dinoflagellate Alexandrium minutum under selection of increased temperature and acidification
title_full_unstemmed Effects of adaptation, chance, and history on the evolution of the toxic dinoflagellate Alexandrium minutum under selection of increased temperature and acidification
title_short Effects of adaptation, chance, and history on the evolution of the toxic dinoflagellate Alexandrium minutum under selection of increased temperature and acidification
title_sort effects of adaptation, chance, and history on the evolution of the toxic dinoflagellate alexandrium minutum under selection of increased temperature and acidification
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3402198/
https://www.ncbi.nlm.nih.gov/pubmed/22833798
http://dx.doi.org/10.1002/ece3.198
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