Phytoplankton processes. Part 1: Community structure during the Southern Ocean Iron RElease Experiment (SOIREE)

被引:139
作者
Gall, MP
Boyd, PW
Hall, J
Safi, KA
Chang, H
机构
[1] NIWA, Natl Inst Water & Atmospher Res Ltd, Christchurch, New Zealand
[2] Univ Otago, Dept Chem, Ctr Chem & Phys Oceanog, NIWA,Natl Inst Water & Atmospher Res Ltd, Dunedin, New Zealand
[3] NIWA, Natl Inst Water & Atmospher Res Ltd, Hamilton, New Zealand
[4] NIWA, Natl Inst Water & Atmospher Res Ltd, Wellington, New Zealand
关键词
D O I
10.1016/S0967-0645(01)00008-X
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
The first in situ iron-fertilisation in polar Southern Ocean waters, SOIREE (Southern Ocean Iron RElease Experiment) was a mesoscale, 13-day experiment that resulted in a phytoplankton bloom (chlorophyll-a increased six-fold; algal carbon, three-fold). Just prior to the iron enrichment, community chlorophyll-a at the study site was dominated by picoplankton, with an 'innoculum' of large diatoms. Iron enrichment resulted in a floristic shift, with increased diatom abundances, and to a lesser extent elevated nanoplankton stocks. Picoplankton stocks initially increased in response to iron supply, but were then grazed down to initial levels by microzooplankton. The chain-forming pennate diatom Fragilariopsis kerguelensis was the dominant bloom species, although < 20 mum haptophytes also increased in abundance. Other algal responses to iron enrichment included elevated nanoplankton cell size, increased chain length of Fragilariopsis kerguelensis, and higher cellular chlorophyll-a levels within the pico-, nano- and microplankton. During the SOIREE bloom, chlorophyll-a levels of up to 3.0 mg m(-3) were recorded at depth. and averaged 1.8 mg m(-3) in the 65-m mixed layer. The floristic shift from a picoeukaryote-dominated community to one dominated by large diatoms was similar to that observed prior to and during algal blooms in the vicinity of open-ocean fronts in the Southern Ocean. (C) 2001 Elsevier Science Ltd. All rights reserved.
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页码:2551 / 2570
页数:20
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