Preface The expedition ARK XIX/3 with the German icebreaking RV ...

At the position of the moorings a CTD profile from the surface to the seafloor was
carried out and water samples were taken at 16 depths and filtered for the analysis of
Chl. a, seston, particulate organic carbon and nitrogen and the determination of
biogenic Si as well as species composition of the phytoplankton. Along the
“Hausgarten” depth transect samples were also taken from the bottom water sampler
for measurements of the parameters mentioned above. All these analyses will be
carried out after the return to the land based laboratory.
Samples with a phytoplankton net (25 m) from the top 15 m of the water column were
taken during the cruise at several stations. A first analysis of the material revealed that
diatoms dominated the phytoplankton composition (Tab. C1-1). Rhizosolenia hebetata
and Chaetoceros decipiens were the species that occurred in higher abundances at
almost every station sampled. Details are presented in Table C1-1. Besides diatoms
the silicoflagellate Distephanus speculum were found regularly and occasionally also
colonies and single cells of Phaeocystis were present.
Tab. C1-1: Abundant phytoplankton species during cruise ARK XIX/3c.
Rhizosolenia hebetata
Rhizosolenia hebetata f. semispina
Rhizosolenia borealis
Rhizosolenis alata
Chaetoceros decipiens
Chaetoceros socialis
Chaetoceros convolutus
Chaetoceros furcellatus
Chaetoceros sp. (small)
Eucampia groenlandica
Thalassiosira nordenskioeldii
Thalassiosira antarctica
Fragillariopsis cylindrus
Phaeocystis
Distephanus speculum
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