Ultraviolet Radiation Effects on Macroalgae from Patagonia, Argentina

  • E. Walter Helbling
  • Virginia E. Villafañe
  • Donat-P. Häder
Chapter
Part of the Cellular Origin, Life in Extreme Habitats and Astrobiology book series (COLE, volume 15)

Abstract

Aquatic ecosystems account for almost half of the primary production on our planet, matching the combined productivity of all terrestrial ecosystems (Siegenthaler and Sarmiento, 1993). Though most of the aquatic productivity is due to phytoplankton, macroalgae contribute to a significant share, especially in coastal areas. In their natural environment, macroalgae are generally exposed to excessive solar PAR (photosynthetic active radiation, 400–700 nm) as well as to ultraviolet radiation (UV-B, 280–315 nm, and UV-A, 315–400 nm), especially in the upper eulittoral and the supralittoral (Hanelt, 1998). The coincidence of low tides and high solar angles results in the highest radiation stress, generally reflected as photoinhibition, i.e., the reduction in photosynthetic rates. Photoinhibition (Dring et al., 1996; Franklin and Forster, 1997; Häder et al., 2001b), is determined not only in macroalgae from the tropics and temperate zones but also in Arctic and Antarctic environments (Hanelt et al., 1997; Hanelt, 1998). Most of the observed photoinhibition is due to PAR, as this waveband has a high proportion of solar radiation energy reaching the Earth’s surface. However, in the top meters of the water column, a significant percentage of photoinhibition is caused by UV-B, and to a lesser extent by UV-A (Dring et al., 1996; Häder, 1997).

Keywords

Solar Radiation Photosynthetic Active Radiation Polar Vortex Rock Pool Total Column Ozone 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was supported by Agencia Nacional de Promoción Científica y Tecnológica – ANPCyT (Project PICT N° 2005-32034 to VEV), Proalar (Project N° 2000-104 to EWH), the United Nations Global Environmental Fund (PNUD Project N° B-C-39 to EWH), Fundación Antorchas (Project A-13955/3 to EWH), the Deutsche Akademische Austauschdienst (Project Proalar N° T332 408 138 415-RA to D.-P.H), and Fundación Playa Unión. This is contribution N° 114 of Estación de Fotobiología Playa Unión.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • E. Walter Helbling
    • 1
    • 2
  • Virginia E. Villafañe
    • 1
    • 2
  • Donat-P. Häder
    • 3
  1. 1.Estación de Fotobiología Playa UniónRawsonArgentina
  2. 2.Consejo Nacional de Investigaciones Científicas y TécnicasCONICETArgentina
  3. 3.Department of BiologyFriedrich-Alexander Universität Erlangen/NürnbergErlangenGermany

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