The esrindex package is used to estimate bottom trawl survey abundance indices for Structural Epifauna, Jellyfish, Miscellaneous Benthic Fauna, and Forage Fish contributions for Alaska Ecosystem Status Reports (ESRs). Time series for each taxonomic group and region (Aleutian Islands [AI], Gulf of Alaska [GOA], Eastern Bering Sea [EBS], and Northern Bering Sea [NBS]) are included in the package as built-in data sets. Indicator time series figures are available in /plots/. Indicator time series are updated in September following the finalization of catch and effort data from summer bottom trawl surveys.
| Contribution | AI | GOA | EBS/NBS |
|---|---|---|---|
| Forage Fish | NA | Megsie Siple | NA |
| Jellyfish | Ned Laman | Alexandra Dowlin | Thaddaeus Buser |
| Miscellaneous Benthic Fauna | Sarah Friedman | Sarah Friedman | Thaddaeus Buser |
| Structural Epifauna | Christina Conrath | Christina Conrath | Thaddaeus Buser |
The esrindex package produces estimates of regional and subarea/stratum indices of abundance (biomass in kilotons) and confidence intervals for each ESR taxa by fitting a multivariate random effects model (REM) to design-based abundance index time series from individual survey strata (EBS groundfish strata) or subareas (AI or GOA INPFC subareas). Abundance indices are calculated from AFSC summer bottom trawl survey catch and effort data using the gapindex R package. Random effects models are fitted to abundance index time series using the rema R package.
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