Data used to demonstrate a Model of Intermediate Complexity (MICE)
for the eastern Bering Sea.
data(eastern_bering_sea) loads a list that includes four components:
Surveyis a long-form data-frame with three columns, providing the Year, Mass (in relative units for most taxa, and million metric tons for Pollock, Cod, Arrowtooth, and NFS), and Taxon for each year with available dataCatchis a long-form data-frame with three columns, providing the Year, Mass (in million metric tons), and Taxon for each year with available dataP_over_Bis a numeric vector with the unitless ratio of biomass production to population biomass for each taxonQ_over_Bis a numeric vector with the unitless ratio of biomass consumption to population biomass for each taxonDiet_proportionsis a numeric matrix where each column lists the proportion of biomass consumed that is provided by each prey (row)
Usage
data(eastern_bering_sea)Details
The data compiled come from a variety of sources:
Northern fur seal (NFS) survey is an absolute index, corrected for proportion of time spent in the eastern Bering Sea. NFS QB is developed from a bioenergetic model and also corrected for seasonal residency. Both are provided by Elizabeth McHuron. It is post-processed in a variety of ways, and not to be treated as an index of abundance for NFS for other uses.
Pollock, cod, and arrowtooth surveys are from a bottom trawl survey, and cod and arrowtooth are treated as an absolute index.
Copepod and other zooplankton are from an oblique tow bongo net survey, with data provided by Dave Kimmel. It is then post-processed to account for spatially and seaonally imbalanced data.
Other P_over_B, Q_over_B and Diet_proportions values are derived from Rpath models, provided by Andy Whitehouse.
Primary producers is an annual index of relative biomass, developed from monthly satellite measurements and provided by Jens Nielsen. See Thorson et al. (In review) for more details regarding data standardization and sources