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

Okhotsk Sea pack ice from Shiretoko innorthern Hokkaido, sampled in March 2007, containedmicroalgal communities dominated by the centric diatomsThalassiosira nordenskioeldi and T. punctigera. Dominationby this genus is very unusual in sea ice. Communitiesfrom nearby fast ice at Saroma-ko lagoon were...

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Bibliographic Details
Published in:Polar Biology
Main Authors: McMinn, A, Hattori, H, Hirawake, T, Iwamoto, A
Format: Article in Journal/Newspaper
Language:English
Published: Springer 2008
Subjects:
Biological Sciences
Ecology
Marine and Estuarine Ecology (incl. Marine Ichthyology)
Okhotsk
ice algae
okhotsk sea
Polar Biology
Sea ice
Online Access:http://www.springerlink.com
https://doi.org/10.1007/s00300-008-0433-0
http://ecite.utas.edu.au/56020
Description
Summary:Okhotsk Sea pack ice from Shiretoko innorthern Hokkaido, sampled in March 2007, containedmicroalgal communities dominated by the centric diatomsThalassiosira nordenskioeldi and T. punctigera. Dominationby this genus is very unusual in sea ice. Communitiesfrom nearby fast ice at Saroma-ko lagoon were dominatedby Detonula conferavea and Odontella aurita. Averagemicroalgal biomass of the Okhotsk Sea pack ice (surfaceand 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 lgl-1 (=31.1 5.0 mg chla m-2). Maximum quantum yieldof the Shiretoko pack ice algal communities was0.618 0.056 with species-specific data ranging between0.211 and 0.653. These community values are amongst thehighest recorded for sea ice algae. Rapid light curves(RLC) on individual cells indicated maximum relativeelectron transfer rates (relETR) between 20.8 and 60.6,photosynthetic efficiency values (a) between 0.31 and 0.93and onset of saturation values (Ek) between 33 and91 lmol photons m-2 s-1. These data imply that the packice algal community at Shiretoko was healthy and activelyphotosynthesising. Maximum quantum yield of theSaroma-ko fast ice community was 0.401 0.086, withvalues for different species between 0.361 and 0.560. RLCdata from individual Saroma-ko fast ice algal cells indicatedrelETR between 55.3 and 60.6, a values between0.609 and 0.816 and Ek values between 74 and 91 lmolphotons m-2 s-1 which are consistent with measurementsin previous years.

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