Description Usage Arguments Details Value Author(s) References See Also Examples
This function calculates the Coefficient of Variation of the Biomass for j areas and i years.
A dataframe of fishery independent data derived from research vessel
survey data or model output, with columns
Window for the moving average. The first and last
A vector of years for which to calculate indicator.
The Coefficient of Variation of the Biomass (CVBiomass) was estimated as an n-year moving average (Blanchard and Boucher, 2001):
CVBiomass = sd(total biomass for the past n years)/mean(total biomass for the past n years)
Returns a dataframe with three columns:
The first and last
floor(wind/2) values of the indicator are assigned
NA to account for the moving average. If there is no data for spatial
scale j in year i, indicator value is assigned NA.
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.
Blanchard F, Boucher J (2001) Temporal variability of total biomass in harvested communities of demersal fishes. Fisheries Research. 49. 283–293. 10.1016/S0165-7836(00)00203-4.
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, Ould Mohammed Abdallahi ., 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
Other stability and resistance indicators:
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