期刊论文详细信息
Marine Ecology Progress Series
Differences in plankton community structure along the Godthåbsfjord, from the Greenland Ice Sheet to offshore waters
Kristine Engel Arendt1  Torkel Gissel Nielsen1  Kajsa T#xf6nnesson1  S#xf8ren Rysgaard1 
关键词: West Greenland coast;    Sub-Arctic fjord;    Physical gradients;    Plankton community structure;    Primary and secondary production;    Vertical flux;   
DOI  :  10.3354/meps08368
学科分类:海洋学与技术
来源: Inter-Research
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【 摘 要 】

ABSTRACT: This study describes differences in plankton community structure and in chemical and physical gradients between the offshore West Greenland Current system and inland regions close to the Greenland Ice Sheet during the post-bloom in Godthåbsfjorden (64°N, 51°W). The offshore region had pronounced vertical mixing, with centric diatoms and Phaeocystis spp. dominating the phytoplankton, chlorophyll (chl) a (0.3 to 3.9 µg l–1) was evenly distributed and nutrients were depleted in the upper 50 m. Ciliates and heterotrophic dinoflagellates constituted equal parts of the protozooplankton biomass. Copepod biomass was dominated by Calanus spp. Primary production, copepod production and the vertical flux were high offshore. The water column was stratified in the fjord, causing chl a to be concentrated in a thin sub-surface layer. Nutrients were depleted above the pycnocline, and Thalassiosira spp. dominated the phytoplankton assemblage close to the ice sheet. Dinoflagellates dominated the protozooplankton biomass, whereas copepod biomass was low and was dominated by Pseudocalanus spp. and Metridia longa. Primary production was low in the outer part of the fjord but considerably higher in the inner parts of the fjord. Copepod production was exceeded by protozooplankton production in the fjord. The results of both physical/chemical factors and biological parameters suggest separation of offshore and fjord systems.

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