Description Usage Arguments Value Author(s) References See Also Examples
This function calculates the biomass per discrete trophic level for j areas and i years.
biomassPerTL(X, TL.table, metric = "BIOMASS", TL.grouping = 1, years)
A dataframe of fishery independent data derived from research vessel
survey data or model output, with columns
A dataframe with columns
A character string indicating which column in
Size of the trophic level bin for which to aggregate
biomass. For example, if
A vector of years for which to calculate indicator.
Returns a dataframe with columns
YEAR, and the
corresponding biomass for each trophic level grouping. For example: for
TL.grouping = 1, function will return columns
TL.grouping = 0.5,
function will return columns
If there is no data for spatial scale j in year i, indicator
value is assigned
Danielle Dempsey Danielle.Dempsey@dfo-mpo.gc.ca, Adam Cook, Catalina Gomez, Alida Bundy
Bundy A, Gomez C, Cook AM. 2017. Guidance framework for the selection and evaluation of ecological indicators. Can. Tech. Rep. Fish. Aquat. Sci. 3232: xii + 212 p.
Bundy, A. 2005. Structure and functioning of the eastern Scotian Shelf ecosystem before and after the collapse of groundfish stocks in the early 1990s. Canadian Journal of Fisheries and Aquatic Sciences, 62(7), pp.1453-1473.
Coll M, Shannon LJ, Moloney CL, Palomera I, Tudela S, 2006. Comparing trophic flows and fishing impacts of a NW Mediterranean ecosystem with coastal upwellings by means of standardized ecological models and indicators. Ecol. Model. 198, 53-70.
Other stability and resistance indicators:
1 2 3 4 5 6 7
# Compile data data(X) data(species.info) # Calculate indicators biomassPerTL(X = X, TL.table = species.info, metric = "BIOMASS", TL.grouping = 1, years = c(2014:2019))
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.