Calculate the Fogarty index

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"

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.

Value

Data frame:

YEAR

Year of the index

INDEX

Value of the index

Details

The units of the index: unitless

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()