NDLI: Drift-ice and under-ice water communities in the Gulf of Bothnia (Baltic Sea)

Content Provider	Springer Nature Link
Author	Rintala, Janne Markus Piiparinen, Jonna Uusikivi, Jari
Copyright Year	2009
Abstract	The algal, protozoan and metazoan communities within different drift-ice types (newly formed, pancake and rafted ice) and in under-ice water were studied in the Gulf of Bothnia in March 2006. In ice, diatoms together with unidentified flagellates dominated the algal biomass (226 ± 154 μg ww l−1) and rotifers the metazoan and protozoan biomass (32 ± 25 μg ww l−1). The under-ice water communities were dominated by flagellates and ciliates, which resulted in lower biomasses (97 ± 25 and 21 ± 14 μg ww l−1, respectively). The under-ice water and newly formed ice separated from all other samples to their own cluster in hierarchical cluster analysis. The most important discriminating factors, according to discriminant analysis, were chlorophyll-a, phosphate and silicate. The under-ice water/newly formed ice cluster was characterized by high nutrient and low chlorophyll-a values, while the opposite held true for the ice cluster. Increasing trends in chlorophyll-a concentration and biomass were observed with increasing ice thickness. Within the thick ice columns (>40 cm), the highest chlorophyll-a concentrations (6.6–22.2 μg l−1) were in the bottom layers indicating photoacclimation of the sympagic community. The ice algal biomass showed additional peaks in the centric diatom-dominated surface layers coinciding with the highest photosynthetic efficiencies [0.019–0.032 μg C (μg Chl-a −1 h−1) (μE m−2 s−1)−1] and maximum photosynthetic capacities [0.43-1.29 μg C (μg Chl-a −1 h−1)]. Rafting and snow-ice formation, determined from thin sections and stable oxygen isotopic composition, strongly influenced the physical, chemical and biological properties of the ice. Snow-ice formation provided the surface layers with nutrients and possibly habitable space, which seemed to have favored centric diatoms in our study.
Starting Page	179
Ending Page	191
Page Count	13
File Format	PDF
ISSN	07224060
Journal	Polar Biology
Volume Number	33
Issue Number	2
e-ISSN	14322056
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-08-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Baltic Sea Sea ice Chlorophyll-a Algae Protozoa Metazoa Ice structure Zoology Ecology Plant Sciences Microbiology Oceanography
Content Type	Text
Resource Type	Article
Subject	Agricultural and Biological Sciences

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