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Preliminary investigation of Okhotsk Sea ice algae; taxonomic composition and photosynthetic activity


McMinn, A and Hattori, H and Hirawake, T and Iwamoto, A, Preliminary investigation of Okhotsk Sea ice algae; taxonomic composition and photosynthetic activity, Polar Biology, 31, (8) pp. 1011-1015. ISSN 0722-4060 (2008) [Refereed Article]

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DOI: doi:10.1007/s00300-008-0433-0


Okhotsk Sea pack ice from Shiretoko in northern Hokkaido, sampled in March 2007, contained microalgal communities dominated by the centric diatoms Thalassiosira nordenskioeldi and T. punctigera. Domination by this genus is very unusual in sea ice. Communities from nearby fast ice at Saroma-ko lagoon were dominated by Detonula conferavea and Odontella aurita. Average microalgal biomass of the Okhotsk Sea pack ice (surface and bottom) was 1.59 1.09 lg chla l-1 and for fast ice (bottom only) at nearby Saroma-ko lagoon, 16.5 3.2 lg l-1 (=31.1 5.0 mg chla m-2). Maximum quantum yield of the Shiretoko pack ice algal communities was 0.618 0.056 with species-specific data ranging between 0.211 and 0.653. These community values are amongst the highest recorded for sea ice algae. Rapid light curves (RLC) on individual cells indicated maximum relative electron transfer rates (relETR) between 20.8 and 60.6, photosynthetic efficiency values (a) between 0.31 and 0.93 and onset of saturation values (Ek) between 33 and 91 lmol photons m-2 s-1. These data imply that the pack ice algal community at Shiretoko was healthy and actively photosynthesising. Maximum quantum yield of the Saroma-ko fast ice community was 0.401 0.086, with values for different species between 0.361 and 0.560. RLC data from individual Saroma-ko fast ice algal cells indicated relETR between 55.3 and 60.6, a values between 0.609 and 0.816 and Ek values between 74 and 91 lmol photons m-2 s-1 which are consistent with measurements in previous years.

Item Details

Item Type:Refereed Article
Keywords:Okhotsk Sea ice algae Photosynthesis Saroma
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Assessment and management of terrestrial ecosystems
UTAS Author:McMinn, A (Professor Andrew McMinn)
ID Code:56020
Year Published:2008
Web of Science® Times Cited:25
Deposited By:IASOS
Deposited On:2009-03-20
Last Modified:2009-06-10

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