Variation in Thermal Tolerance of the Giant Kelp's Gametophytes: Suitability of Habitat, Population Quality or Local Adaptation?

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dc.contributor.authorBecheler, Ronan
dc.contributor.authorHaverbeck, Daniela
dc.contributor.authorClerc, Corentin
dc.contributor.authorMontecinos, Gabriel
dc.contributor.authorValero, Myriam
dc.contributor.authorMansilla, Andres
dc.contributor.authorFaugeron, Sylvain
dc.date.accessioned2025-01-20T21:03:38Z
dc.date.available2025-01-20T21:03:38Z
dc.date.issued2022
dc.description.abstractThe giant kelp Macrocystis pyrifera is a cosmopolitan species of cold-temperate coasts. Its South-American distribution ranges from Peru to Cape Horn and Argentina, encompassing a considerable temperature gradient, from 3 to 20 degrees C. Temperature is known to strongly affect survival, growth and reproduction of many kelp species, and ongoing global warming is already eroding their range distribution. Their response to thermal variability was shown to vary among genetically differentiated regions and populations, suggesting a possible adaptive divergence in thermal tolerance traits. This study aimed at testing the existence of local adaptation in the giant kelp, in regions separated by up to 4000km and strong thermal divergence. Two complementary experiments mimicked reciprocal transplants through a common garden approach, each habitat being represented by a given temperature corresponding to the regional average of the sampled populations. Several proxies of fitness were measured in the haploid stage of the kelp, and sympatric versus allopatric conditions (i.e. individuals at the temperature of their region of origin versus in a different temperature and versus individuals from other regions in that temperature) were compared. Additionally, a heat wave at 24 degrees C was applied to measure the tolerance limits of these gametophytes. A significant interaction between experimental temperature and region of origin revealed that temperature tolerance varied among regions. However, depending on the fitness parameter measured, high latitude populations from the sub-Antarctic region were not always less heat resilient than populations from the warmer region of Peru. Even at 24 degrees C, a temperature that is exceptionally reached in the southernmost part of the kelp's natural habitat, all the gametophytes survived, although with strong differences in other traits among regions and populations within regions. This large range of temperature tolerance supports the idea of kelp gametophytes being a resistant stage. Finally, local adaptation sensu stricto was not detected. Fertility was more influenced by the geographic origin than by temperature, with possible effects of marginal conditions at the extremes of the distribution range. The latter results also suggest that stochastic dynamics such as genetic drift restricts adaptive processes in some populations of M. pyrifera.
dc.fuente.origenWOS
dc.identifier.doi10.3389/fmars.2022.802535
dc.identifier.eissn2296-7745
dc.identifier.urihttps://doi.org/10.3389/fmars.2022.802535
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/93163
dc.identifier.wosidWOS:000837258300001
dc.language.isoen
dc.revistaFrontiers in marine science
dc.rightsacceso restringido
dc.subjectphenotypic plasticity
dc.subjectlatitudinal gradient
dc.subjectcommon garden experiment
dc.subjectheat tolerance
dc.subjectlocal adaptation
dc.subject.ods13 Climate Action
dc.subject.ods14 Life Below Water
dc.subject.ods15 Life on Land
dc.subject.odspa13 Acción por el clima
dc.subject.odspa14 Vida submarina
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.titleVariation in Thermal Tolerance of the Giant Kelp's Gametophytes: Suitability of Habitat, Population Quality or Local Adaptation?
dc.typeartículo
dc.volumen9
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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