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Journal of Applied Phycology

, Volume 31, Issue 2, pp 915–928 | Cite as

Effects of temperature and salinity on the reproductive phases of Macrocystis pyrifera (L.) C. Agardh (Phaeophyceae) in the Magellan region

  • Juan Pablo RodríguezEmail author
  • J. Terrados
  • S. Rosenfeld
  • F. Méndez
  • J. Ojeda
  • A. Mansilla
VI REDEALGAS WORKSHOP (RIO DE JANEIRO, BRAZIL)

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.

Keywords

Phaeophyta Environmental heterogeneity Salinity Temperature Sub-Antarctic region Chile 

Notes

Acknowledgements

The authors wish to thank project FONDECYT 1140940 “Macroalgal adaptive radiation: potential links to ecological niche diversity in the ecoregion of Magallanes and Chilean Antarctic” and project FONDECYT 1180433 “Genomic, physiological and ecological approaches to examine Antarctic and Sub-Antarctic macroalgal responses to climate change and glacial retreat”.

Funding information

We are thankful for the graduate scholarships awarded by the Institute of Ecology and Biodiversity granted to FM (ICM, P05- 002), JPR (ICM, P05-002), and SR (ICM P05-002).

Supplementary material

10811_2018_1693_MOESM1_ESM.docx (893 kb)
ESM 1 (DOCX 893 kb)

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Laboratorio de Ecosistemas Marinos Antárticos y Subantárticos (LEMAS)Universidad de MagallanesPunta ArenasChile
  2. 2.Instituto de Ecología y Biodiversidad (IEB)SantiagoChile
  3. 3.Instituto Mediterráneo de Estudios Avanzados, (IMEDEA, CSIC-UIB)MallorcaSpain
  4. 4.School of Environmental StudiesUniversity of VictoriaVictoriaCanada

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