Abstract:
This dataset describes ice algae (10 species; 38 rows) of the Barents Sea studied from 1986 to 1988. With a few exceptions, the ice algal assemblages were dominated by pennate diatoms. From March to early June there was a transition from a mixed population of both centric and pennate diatoms at the start into a well developed Nitzschia frigida assemblage. Nutrients in ice-covered regions were high ... in spring, and high N/C and protein/carbohydrate ratios indicated no nutrient deficiency in the ice algae. The N/P ratios were lower than 15, but comparable to ratios of three ice algae species grown in culture at -0.5 C and various light conditions. The Si/N ratios were lower than corresponding ratios from the Canadian Arctic and the Anarctic. The chemical composition revealed that silicate limited growth cannot be excluded. The cells were heavily shade-adapted the entire spring season, with high Chl/C ratios (0.045-0.084), comparable to the cultures growing at low irradiances. The growth rates in the cultures peaked at 50 μmol m-2 s-1 with maximum rates of 0.6-0.8 div. day-1, both for 12 and 24 h day lengths. The low growth rates for the May assemblages (max 0.20 div. day-1) indicated strong light limitation by self-shading. Adaptation experiments showed that some ice algae are highly adaptable, while others are not able to adjust by high irradiances, and this may affect the distribution in the field.
Purpose:
These data are from a survey of the conditions and compositions of sub-ice algae in the Barents Sea.
LOGICAL CONSISTENCY REPORT: Samples in September were collected with aerial assistance, rest by diving based from a ship.
PROCESS DESCRIPTION: Added AOOS/IOOS core variables. Added ArcOD archive information. Changed "scientificnameauthors" to "scientificnameauthor" to match data csv and obis.xml
Access Constraints
None
Use Constraints
Although these data have been processed successfully on a computer system at the University of Alaska and ArcOD, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use ... with other data. It is strongly recommended that these data are directly acquired from a University of Alaska server, and not indirectly through other sources which may have changed the data in some way. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. The University of Alaska shall not be held liable for improper or incorrect use of the data described and/or contained herein.
