Abstract
Environmental heterogeneity plays a key role in spatio-temporal distribution of organisms, their ecology and their evolutionary biology, with their physiological response, or tolerance to the environment defining their distributional range. The macroalgae of the sub-Antarctic ecoregion of Magallanes are subject to a wide range of environments, resulting from geomorphological processes (glacial erosion in the Quaternary), oceanographic gradients, and drastic seasonal variations of photoperiod and irradiance (winter <8 h of light, summer >17 h). We examined the tolerance response of the brown alga Lessonia flavicans to contrasting environments (three salinities, two temperatures, and two photoperiods) under controlled laboratory conditions. Our results suggest that L. flavicans has limited salinity tolerance that is affected by temperature and photoperiod. Summer temperature (9 °C ± 0.02) and photoperiod (18:6 h L:D) and salinity 32 psu seem optimal conditions for L. flavicans sporophyte development. Results of the present study provide key information for culturing a species of high economic and biological value, and could aid in predicting the species potential tolerance response to environmental fluctuations in the wake of global changes.
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Acknowledgments
The authors thank the support and funding of CONICYT–Chile (Program FONDECYT 1110875) for the collection of samples and the materials for experiments. Author SR would like to thank the Scholarship provided by the Institute of Ecology and Biodiversity (www.ieb.cl; Chile) (code ICM P05-002) and The Master of Science Program in Conservations and Management of Natural Resources in Sub-Antarctic Ecosystems of the University of Magallanes (www.umag.cl/postgrados/magister-ciencias/). Also the students of Magister program in Statistics at the University of Concepción, Mr. Geovanni Moreno, José Salcedo and Alex Pereira for their help in the statistical analysis of experimental data. Finally the author would like to thank the AM Millennium Scientific Initiative (grant no. P05-002 ICM, Chile) and the Basal Financing Program of the Comisión Nacional de Investigación Científica y Tecnológica (grant no. PFB-23, Chile).
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Mansilla, A., Rosenfeld, S., Rendoll, J. et al. Tolerance response of Lessonia flavicans from the sub-Antarctic ecoregion of Magallanes under controlled environmental conditions. J Appl Phycol 26, 1971–1977 (2014). https://doi.org/10.1007/s10811-014-0294-6
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DOI: https://doi.org/10.1007/s10811-014-0294-6