Data for the current year are presented as monthly means, superimposed on the long-term monthly mean
and minimum/maximum monthly values found in the time series to date (for most regions since 2000).
Open circles are PROVISIONAL data, based on 25% of the samples to be analysed, and numbers will change
as more samples are processed and quality-controlled.
Filled circles are finalized data when all samples have been finalized and QCd.
Four variables have been selected
- Total Diatom abundance
- Mesozooplankton abundance
- Estimated Mesozooplankton biomass (dry weight) and
- Average Copepod Community Size (based on Richardson et al., 2006 where the published
length of the adult female represents all individuals of the species).
These variables are believed to provide a useful summary of the plankton, but there are some caveats and limitations:
- The CPR only semi-quantitatively captures diatoms, and is biased towards the larger, chain forming varieties,
therefore this may only be a small portion of the phytoplankton community.
- The number of samples that the provisional data are based on is small, especially for the smaller regions.
Regions with the best sample density are: Oceanic NE Pacific, Alaskan Shelf, and S. Bering Sea
- Three regions are sampled by the east-west transect only, which runs only three times a year in spring,
summer and fall (W. GoA, Aleutian Shelf and S Bering Sea). It is difficult to study the seasonal cycle within
the current year with just 3 data points (although comparisons with the long term monthly means are still valid).
Data will be updated several times a year - check back regularly for the latest information.