Description Usage Arguments Details Value Author(s) References Examples
View source: R/meanLengthCommunity.R
This function calculates the Mean Length of the Community weighted by biomass or abundance for j areas and i years.
meanLengthCommunity(X_length, metric, years)
A dataframe of fishery independent data derived from research
vessel survey data or model output, with columns
A character string indicating which column in
A vector of years for which to calculate indicator.
MeanLength = Σ(Length_m * metric_i)/Σ metric_j
where Length_m is the length (cm) of an individual in size class m, metric_i is the biomass or abundance of species i and metric_j is the total biomass or abundance of the community (Shin et al., 2010).
Returns a dataframe with 3 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.
Shin, YJ, Shannon LJ, Bundy A, Coll M, Aydin K, Bez N, Blanchard JL, Borges, MF, Diallo I, Diaz E, Heymans JJ, Hill L, Johannesen E, Jouffre D, Kifani S, Labrosse P, Link JS, Mackinson S, Masski H, Möllmann C, Neira S, Ojaveer H, Abdallahi KM, Perry I, Thiao D, Yemane D, and Cury PM. 2010. Using indicators for evaluating, comparing and communicating the ecological status of exploited marine ecosystems. Part 2: Setting the scene. ICES Journal of Marine Science, 67: 692-716
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data(X_length) # Weighted by abundance meanLengthCommunity(X_length, metric = "ABUNDANCE", years = c(2014:2019)) # Weighted by biomass meanLengthCommunity(X_length, metric = "BIOMASS", years = c(2014:2019))
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