Title The effect of prolonged darkness on the growth, recovery and survival of Antarctic sea ice diatoms
Author Reeves, S.; McMinn, A.; Martin, A.
Author Affil Reeves, S., University of Tasmania, Institute of Marine and Antarctic Science, Hobart, Tasmania, Australia
Source Polar Biology, 34(7), p.1019-1032, . Publisher: Springer-Verlag, Berlin, Germany. ISSN: 0722-4060
Publication Date July 2011
Notes In English. Supplemental information/data is available in the online version of this article. 67 refs. Ant. Acc. No: 91547. GeoRef Acc. No: 309874
Index Terms algae; biogeography; ecology; growth; ice; ice cover; ice cover thickness; plant ecology; Antarctica--Antarctic Peninsula; Southern Ocean; Antarctic Peninsula; Antarctica; diatoms; ice cover distribution; Plantae; productivity; sea ice
Abstract While global climate change in polar regions is expected to cause significant warming, the annual cycle of light and dark will remain unchanged. Cultures of three species of Antarctic sea ice diatoms, Fragilariopsis cylindrus (Grunow) Krieger, Thalassiosira antarctica Comber and Entomoneis kjellmanii (P. T. Cleve) Poulin and Cardinal, were incubated in the dark and exposed to differing temperatures. Maximum dark survival times varied between 30 and 60 days. Photosynthetic parameters, photosynthetic efficiency (a), maximum quantum yield (Fv/Fm), maximum relative electron transport rate (rETRmax) and non- photochemical quenching (NPQ), showed that dark exposure had a significant impact on photoacclimation. In contrast, elevated temperatures had a relatively minor impact on photosynthetic functioning during the dark exposure period but had a considerable impact on dark survival with minimal dark survival times reduced to only 7 days when exposed to 10C. Recovery of maximum quantum yield of fluorescence (Fv/Fm) was not significantly impacted by temperature, species or dark exposure length. Recovery rates of Fv/Fm ranged from -5.06E-72.71E-7 s-1 to 1.36E- 51.53E-5 s-1 for monthly experiments and from -9.63E-77.71E-7 s-1 to 2.65E-52.97E-5 s-1 for weekly experiments. NPQ recovery was greater and more consistent than Fv/Fm recovery, ranging between 5.74E-78.11E-7 s-1 to 7.50E-37.1E-4 s-1. The concentration of chl-a and monosaccharides remained relatively constant in both experiments. These results suggest that there will probably be little effect on Antarctic microalgae with increasing water temperatures during the Antarctic winter.
URL http://hdl.handle.net/10.1007/s00300-011-0961-x
Publication Type journal article
Record ID 65006929