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FBIT

Fisheries Benthic Impact Tools

R-script for a regional assessment of different ICES marine ecoregions from WKFBIT. Output follows ICES demonstration product (2017) in “EU request on indicators of the pressure and impact of bottom-contacting fishing gear on the seabed, and of trade-offs in the catch and the value of landings “. Documentation on fishing and environmental input parameters, longevity predictions and state/impact predictions is found in WKFBIT report (http://doi.org/10.17895/ices.pub.5955). Some data sources are provided here:

Fisheries and MSFD habitats

• MSFD habitat categorization: taken from EMODNET as downloaded in 2019 http://www.emodnet.eu/

• Bottom trawl fishing activities are obtained from the ICES datacentre using the icesVMS R package; current output is based on ICES VMS 2019 data call

Longevity prediction North Sea

• Parameterization of the biomass longevity composition of the benthic community is taken from Rijnsdorp et al. (2018) Ecological Applications

• For Kattegat, longevity,slope,intercept were taken from van Denderen et al. (2020) ICES J (see Baltic Sea), which included data in the Kattegat, whereas benthic data from Rijnsdorp et al were mainly from Southern part of the North Sea.

Longevity prediction Baltic Sea

• Parameterization of the biomass longevity composition of the benthic community is taken from van Denderen et al. (2020) ICES journal of Marine Science

Longevity prediction of Celtic Seas and Bay of Biscay and the Iberian Coast

• Not available; one value assumed as test case

Impact/state prediction

• The population dynamic model is first described in Pitcher et al. (2017) Methods in Ecology and Evolution.

• The parameterization of the trawl-specific depletion rates is based on Hiddink et al. (2017) PNAS. The depletion rates are taken from Rijnsdorp et al. (2020) ICES J, where metier-specific depletion rates have been specified following the relationship between gear penetration and depletion of Hiddink et al. (2017).

• The parameterization of the longevity-specific recovery rates is taken from Hiddink et al. (2018) Assessing bottom‐trawling impacts based on the longevity of benthic invertebrates Journal of Applied Ecology