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Title: Morphology and ecology of diatoms in sea ice from the Weddell Sea
Authors: National Science Foundation (U.S.)
Clarke, D. B. (Diane B.)
Ackley, Stephen F.
Kumai, Motoi
Keywords: Antarctic regions
Sea ice
Weddell Sea
Weddell Polynya Expedition
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: CRREL report ; 84-5.
Description: CRREL Report
Abstract: Diatom species composition and relative abundances were determined for ice cores obtained from Weddell Sea pack ice during the October-November 1981 Weddell Polynya Expedition (WEPOLEX). Ice thickness and salinity indicate that the ice was less than one year old. The predominant ice type (70%) was frazil, which has the capacity to mechanically incorporate biological material through nucleation and scavenging. Diatoms were found throughout the length of the cores. Species showed down-core fluctuations in abundance that appeared to be correlated with changes in ice type. Pennate forms were more abundant than centrics, the average ratio being 16:1. Diatom frustules with intact organic material were more abundant (5x10^7 cells/liter). Differences in species abundances are attributed initially to incorporation of algal cells from a temporally changing water column and subsequently to diatom reproduction within the ice. Scanning electron micrographs illustrating the morphologic characteristics of the predominant species are included.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:CRREL Report

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