Paper| Year: | 2019 |
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| Author(s): | J.P. Rodríguez, J. Terrados, S. Rosenfeld, F. Méndez, J. Ojeda, A. Mansilla |
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| Title: | Effects of temperature and salinity on the reproductive phases of Macrocystis pyrifera (L.) C. Agardh (Phaeophyceae) in the Magellan region |
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| Journal: | JOURNAL OF APPLIED PHYCOLOGY |
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| ISSN: | 0921-8971 |
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| JCR Impact Factor: | 3.016 |
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| Volume: | 31 |
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| Issue No.: | 2 |
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| Pages: | 915-928 |
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| D.O.I.: | 10.1007/s10811-018-1693-x |
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| Web: | https://link.springer.com/article/10.1007/s10811-018-1693-x |
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| Abstract: | The region of Magallanes has the world’s largest sub-Antarctic
environments, including the heterogeneous habitats of archipelagos,
fjords, channels, and inlets formed by ice advancing and retreating
during Quaternary glacial processes. In marine ecosystems, the
temperature, salinity, and photoperiod are key parameters which delimit
the survival, reproduction and development of the macroalgae and,
therefore, the biogeography of numerous sub-Antarctic species. In this
research, we compare the reproductive development patterns in spores of Macrocystis pyrifera
coming from places with different salinities along longitudinal and
latitudinal gradients in Skyring Sound, Otway Sound, the Strait of
Magellan (Possession Bay and Puerto del Hambre), and the Beagle Channel
(Paula Bay). Laboratory analyses included four salinities and two
different temperatures, comparing the percentage of spore germination,
sex ratio in females and male gametophytes, and the development of
gametogenesis through the proportion of gametophytes and sporophytes,
with a factorial experimental design. The best germination percentages
were obtained in Puerto del Hambre; the best sex ratio, on the other
hand, was in Skyring Sound; finaly, for gametogenesis development, the
best results were obtained in Otway Sound and Possession Bay. We prove
the temperature and salinity effect over the studied population;
moreover, these results demonstrate that at the end of the cycle each
population develops more effectively in their local conditions, evidence
of a local adaptation in M. pyrifera
populations living in contrasting sites in the same region. This is
crucial to understand how these populations react to the effect of
environmental stressors; furthermore, the selection of appropriate
conditions is also an important factor for the future commercial
cultivation management of these important macroalgae. |
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Related staffJorge Terrados MuñozRelated departmentsMarine EcologyRelated research groupsMarine Ecosystems Dynamics
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