Chemical and biological composition of suspended particles and aggregates in the Baltic Sea in summer (1999)

被引：28
作者：
Engel, A [1 ]
Meyerhöfer, M [1 ]
von Bröckel, K [1 ]
机构：
[1] Univ Kiel, Inst Marine Res, D-24109 Kiel, Germany
来源：
ESTUARINE COASTAL AND SHELF SCIENCE | 2002年 / 55卷 / 05期
关键词：
biogeochemical elements; organic particles; aggregates; filamentous cyanobacteria; Baltic Sea;
D O I：
10.1006/ecss.2001.0927
中图分类号：
Q17 [水生生物学];
学科分类号：
071004 ;
摘要：
Suspended particles and particle aggregates, which formed from concentrated field samples on the roller table; were characterized biologically and chemically along a transect through the Baltic Sea in summer 1999. Phytoplankton composition in field samples was dominated by cyanobacteria, including the filamentous diazotrophic cyanobacteria Aphanizomenon 'baltica', Nodularia spumigena and Anabaena spp. These species formed aggregates together with diatoms, mainly Skeletonema costatum and Chaetoceros spp. and with dinoflagellates, mainly with Dinophysis norvegica. Compared to the Redfield ratio, concentration ratios of particulate organic carbon, nitrogen and phosphorus, [POC] : [PON] : [POP], indicated an enrichment of carbon, especially in aggregates. However, regression analysis indicated a higher production rate of PON relative to POP and POC and significant background concentrations of POC. In field samples the concentration of transparent exopolymer particles (TEP) varied around 200 mug Xanthan Equiv. 1(-1) and comprised a volume fraction of 2-7 ppm and an abundance of about 10(5) TEP ml(-1). TEP were enriched in aggregates as inferred from volume ratios of TEP to conventional particles. It is suggested, that TEP contribute substantially to the background concentration of POC, while the high production rate of PON is attributed to nitrogen fixation of diazotrophic cyanobacteria. (C) 2002 Elsevier Science Ltd. All rights reserved.
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收藏
页码：729 / 741
页数：13
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