Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 16 2008 10.5194/acp-8-4665-2008 http://www.atmos-chem-phys.net/8/4665/2008/ http://www.atmos-chem-phys.net/8/4665/2008/acp-8-4665-2008.html http://www.atmos-chem-phys.net/8/4665/2008/acp-8-4665-2008.pdf 4665 4676 2008-08-12 Eclipse effects on field crops and marine zooplankton: the 29 March 2006 total solar eclipse G. Economou E. D. Christou A. Giannakourou E. Gerasopoulos D. Georgopoulos V. Kotoulas D. Lyra N. Tsakalis M. Tzortziou P. Vahamidis E. Papathanassiou A. Karamanos akaram@aua.gr Lab. of Agronomy, Faculty of Plant Production, Agricultural Univ. of Athens, 75 Iera Odos Str., 11855 Athens, Greece Institute of Oceanography, Hellenic Center for Marine Research, 19013 Anavyssos, Greece Institute for Environmental Research and Sustainable Development, National Observatory of Athens, Greece NASA Goddard Space Flight Center, ESSIC/Univ. of Maryland, Smithsonian Institution, SERC, USA Institute of Inland Waters, Hellenic Center for Marine Research 19013 Anavyssos, Greece Some effects in the biosphere from the Total Solar Eclipse of 29 March 2006 were investigated in field crops and marine zooplankton. Taking into account the decisive role of light on plant life and productivity, measurements of photosynthesis and stomatal behaviour were conducted on seven important field-grown cereal and leguminous crops. A drop in photosynthetic rates, by more than a factor of 5 in some cases, was observed, and the minimum values of photosynthetic rates ranged between 3.13 and 10.13 μmol CO₂ m^−2 s^−1. The drop in solar irradiance and the increase in mesophyll CO₂-concentration during the eclipse did not induce stomatal closure thus not blocking CO₂ uptake by plants. Light effects on the photochemical phase of photosynthesis may be responsible for the observed depression in photosynthetic rates. Field studies addressing the migratory responses of marine zooplankton (micro-zooplankton (ciliates), and meso-zooplankton) due to the rapid changes in underwater light intensity were also performed. The light intensity attenuation was simulated with the use of accurate underwater radiative transfer modeling techniques. Ciliates, responded to the rapid decrease in light intensity during the eclipse adopting night-time behaviour. 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