calc_fogarty_index: Calculate the Fogarty index

In andybeet/indexPPR: Utilities to create ecosystem overfishing indices for the NEFSC State of the Ecosystem report

Description

The Fogarty Index is the ratio of total catches to total primary productivity in an ecosystem. Link and Watson (2019) state ".. Fogarty ration of 0.22 to 0.92 per mil, with an extreme limit of ~2.5 emerges from theoretically based limits coupled with estimates of global catches"

Usage

calc_fogarty_index(
  catch,
  PP,
  yearFieldCatch = "YEAR",
  catchField = "totLand",
  ppField = "ANNUAL_MEAN",
  yearFieldPP = "YEAR"
)

Arguments

catch	Data frame. Data containing the total catch (mt/region/year) by each species in each year.
PP	Data frame. Data containing Primary Production same units as catch (but in Carbon)
yearFieldCatch	Character string. The name of the field in catch which contains the Year.
catchField	Character string. The name of the field in catch which contains the catch data.
ppField	Character string. The name of the field in PP which contains the ANNUAL_MEAN data.
yearFieldPP	Character string. The name of the field in PP which contains the Year.

Details

The units of the index: unitless

Value

Data frame:

YEAR	Year of the index
INDEX	Value of the index

Sources

J. S. Link, R. A. Watson, Global ecosystem overfishing: Clear delineation within real limits to production. Sci. Adv. 5, eaav0474 (2019). DOI: 10.1126/sciadv.aav0474

See Also

Other Link Indices: calc_ryther_index()

andybeet/indexPPR documentation built on March 18, 2021, 12:33 p.m.