FishingInBalance: Calculates the Fishing-in-Balance Index
In dempseydanielle/marindicators: Marine Ecosystem and Fishing Pressure Indicators

Description Usage Arguments Details Value Author(s) References See Also Examples

This function calculates the Fishing-in-Balance (FiB) Index of fisheries landings for j areas and i years.

fishingInBalance(
  land,
  TL.table,
  minTL = 0,
  TE = 0.1,
  base.start,
  base.end,
  years
)

`land`	A dataframe of commercial landings data with columns `YEAR`, `ID`, `SPECIES` and `CATCH`. `YEAR` indicates the year the landing was recorded, `ID` is an area code indicating where the landing was recorded, `SPECIES` is a numeric code indicating the species landed, and `CATCH` is the corresponding landed weight.
`TL.table`	A dataframe with columns `SPECIES` and the corresponding `TL_LAND` (trophic level). Entries in the `SPECIES` column should be the unique values of species codes in `land` (or a subset thereof). Other columns in `TL.table` are ignored.
`minTL`	The minimum trophic level of species to include. Default is `minTL = 0`.
`TE`	Trophic efficiency. Default is `TE = 0.1`, i.e., a trophic efficiency of 10%.
`base.start`	Year indicating the beginning of the baseline period. The average landings and average mean trophic level of the landings over the baseline period are used as baseline values to calculate FiB (see Details). `land` must include data for the baseline period.
`base.end`	Year indicating the end of the baseline period. The average landings and average mean trophic level of the landings over the baseline period are used as baseline values to calculate FiB (see Details). `land` must include data for the baseline period.
`years`	A vector of years for which to calculate indicator.

Fishing-in-Balance (FiB) Index:

FiB = log(Y_k*(1/TE)^{TL_k}) - log(Y_0 * (1/TE)^{TL_0})

where Y is the catch, TL is the mean trophic level in the catch, TE is the transfer efficiency, k is any year, and 0 refers to any year used as a baseline. By default, TE is set to 0.10 (Pauly and Christensen 1995).

This indicator captures changes in fishing strategies and their impact on system productivity: a positive FiB index indicates that the fishery has expanded and/or bottom-up effects are occurring, and there is more catch than expected, while a negative FiB index indicates it is likely that the fishing impact is so high that the ecosystem function is impaired and the ecosystem is less productive owing to excessive fishery removals (Pauly et al., 2000).

Returns a dataframe with three columns: ID, YEAR, and FishinginBalance.

If there are no observations in land for spatial scale j and year i, indicator value is set to NA.

Danielle Dempsey, Adam Cook Adam.Cook@dfo-mpo.gc.ca, 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.

Pauly D, Christensen V, Walters C. 2000. Ecopath, Ecosim, and Ecospace as tools for evaluating ecosystem impact of fisheries. ICES J Mar Sci 57:697 706

Other resource potential indicators: allPotential(), resourcePotential()

1 2 3 4	data(land) data(species.info) fishingInBalance(land, TL.table = species.info, minTL = 0, TE = 0.1, base.start = 2014, base.end = 2015, years = c(2014:2019))