Mesozooplankton collections were made during a one-year field period from August 1998 until July 1999 in Kongsfjorden, Svalbard, Norway, to investigate the seasonality of species composition, abundance, stage and vertical distribution. These data provide the first year-round zooplankton observation in Kongsfjorden. Sampling was carried out in the deepest accessible part of the fjord, weather ... permitting. Stratified samples were taken from bottom to surface (if weather conditions allowed: at depthclasses of 0 to 50 m, 50 to 100 m, 100 to 200 m, 200 to 300 m, 300 to 350 m), and were collected with a modified Apstein closing net (0.2 m2 mouth opening, 100 µm mesh).Sampling occurred either from R/V Jan Mayen (University of Tromsø vessel), a Norwegian coastguard vessel (R/V Lance), R/V Oceania (Polish Academy of Science, Sopot), a rubber dinghy, or from the ice through a drilled hole. Except onboard R/V Jan Mayen and R/V Oceania a hand-operated whinch was used for the net hauls. Depth, temperature and salinity were measured at each sampling event. Zooplankton abundance was dominated by North Atlantic and epipelagic species such as Calanus finmarchicus, Psdeudocalanus minutus and Oithona similis indicating a strong influence from the North Atlantic current as well as fjord characteristics.
Description of the mesozooplankton species composition, abundance and its seasonal changes in Kongfsjorden in the year 1998/99.
ATTRIBUTE ACCURACY REPORT: Mesh size of 100µm was chosen because the study focus was on smaller sized species, specifically smaller sized copepod crustaceans (Pseudocalanus minutus, Oithona similis). 100 µm mesh size allows to catch most copepodite stages of P. minutus and the older copepodites (CI to CV) of O. similis quantitatively. (Copepodites are the young stages of copepods. They are ... abbreviated CI to CV with CI being the smallest). As normal in such datasets, users should be aware that detectability problems can occur and are not quantified, see for instance Gallienne and Robins (2001), J Plankton Res 23:14211432). <http://plankt.oxfordjournals.org/cgi/content/abstract/23/12/1421> and other references on issues of quantitative sampling, and confirmed presence/absences.
LOGICAL CONSISTENCY REPORT: The same procedure was used at all sites and for all species; findings should be consistent.
COMPLETENESS REPORT: Mesh-size: 100 µm, 0.2m2 mouth opening, mostly five depth layers (0 to 50m, 50 to 100m, 100 to 200m, 200 to 300m, 300 to 350m), no spatial resolution but seasonal observation, sampling location was in the deepest accessible part of the fjord, except in March when sampling had to be done in the inner fjord basin were only two depth strata could be done (deeper strata are lacking in March)
HORIZONTAL POSITIONAL ACCURACY REPORT: Not high, GPS data are lacking, positioning was according to landmarks; it was always tried to sample at the deepest part of the fjord which is quite close to Ny Ålesund settlement between Brandalpynten and Blomstrandhalvöya. The actual position was then estimated from landmarks and an ocean map. If weather and sea-ice conditions did not allow to reach this part of the fjord, sampling was at the deepest accessible part of the fjord according to the map.
PROCESS DESCRIPTION: explained in Methodology of Lischka and Hagen 2005. The three co-occurring Calanus species (C. hyperboreus, C. glacialis, C. finmarchicus) were identified by cephalothorax length according to length limits set by Kwasniewski et al. 2003, JPR 25, 1–20 http://plankt.oxfordjournals.org/cgi/content/abstract/25/1/1
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