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学科主题: Oceanography
题名: Phytoplankton dynamics in the NE subarctic Pacific
作者: Boyd, P ; Harrison, PJ
刊名: DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
发表日期: 1999-01-01
卷: 46, 期:11-12, 页:2405-2432
部门归属: Univ British Columbia, Sch Earth & Ocean Sci, Vancouver, BC V6T 1Z4, Canada
英文摘要: Ocean Station Papa (OSP, 50 degrees N 145 degrees W) in the NE subarctic Pacific is characterised as high nitrate low chlorophyll (HNLC). However, little is known about the spatial extent of these HNLC waters or the phytoplankton dynamics on the basin scale. Algal biomass, production and size-structure data are presented from winter, spring and summer between 1992 and 1997 for five stations ranging from coastal to open-ocean conditions. The inshore stations (P04-P16) are characterised by the classical seasonal cycle of spring and late summer blooms (production > 3 g C m(-2) d(-1)), diatoms are not Fe-stressed, and growth rate is probably controlled by macronutrient supply. The fate of the phytoplankton is likely sedimentation by diatom-dominated spring blooms, with a pelagic recycling system predominating at other times. The offshore stations (P20/OSP) display low seasonality in biomass and production (OSP, mean winter production 0.3 g C m(-2) d(-1), mean spring/summer production 0.85 g C m(-2) d(-1)), and are dominated by small algal cells. Low Fe availability prevents the occurrence of diatom blooms observed inshore. The main fate of phytoplankton is probably recycling through the microbial food web, with relatively low sedimentation compared to inshore. However, the supply of macro- and micro-nutrients to the coastal and open ocean, respectively, may vary between years. Variability in macro-nutrient supply to the coastal ocean may result in decreased winter reserve nitrate, summer nitrate limitation, subsequent floristic shifts towards small cells, and reduced primary production. Offshore, higher diatom abundances are occasionally observed, perhaps indicating episodic Fe supply. The two distinct oceanic regimes have different phytoplankton dynamics resulting in different seasonality, community structure and fate of algal carbon. These differences will strongly influence the biogeochemical signatures of the coastal and open-oceanic NE subarctic Pacific. (C) 1999 Elsevier Science Ltd. All rights reserved.
语种: 英语
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/9320
Appears in Collections:海洋微食物网高被引文献_期刊论文

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Recommended Citation:
Boyd, P; Harrison, PJ.Phytoplankton dynamics in the NE subarctic Pacific,DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY,1999,46(11-12):2405-2432
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