HIMI Demersal Fish Update and Environmental Covariates

Brief description

This dataset contains demersal fish data from 181 trawls from the HIMS 1989-90 (AADC-0075), FISHOG 1991-92 (AADC-00080) and THIRST 1993-94 (AADC-00073) surveys as well as a selection of matching environmental data, most obtained from the Polar_Environmental_Data AADC dataset. The dataset IDs above contain the full metadata for each survey and many environmental layers. The fish data has been modified from the data in the Historical Fish Data database in the following ways: 1) Fish abundances are those recorded in the trawl logs (i.e. not limited to the ~200 measured and weighed for abundant species) 2) Trawls noted as having issues in log books or without complete coverage of the selected environmental covariates were omitted 3) Species that were rare (present at less than 8 sites) were omitted, leaving 15 species. The dataset consists of a spreadsheets called fish.csv. It contains fish abundance records and associated environmental covariates for each haul Below are descriptions of field headers in the fish.csv file as well as source, units and resolution for environmental covariates Column Name Description Units Resolution Source 1 Champsocephalus_gunnari Species abundance Count NA AAD Historical Fish Database checked against trawl logs 2 Lepidonotothen_squamifrons Species abundance Count NA AAD Historical Fish Database checked against trawl logs 3 Channichthys_rhinoceratus Species abundance Count NA AAD Historical Fish Database checked against trawl logs 4 Dissostichus_eleginoides Species abundance Count NA AAD Historical Fish Database checked against trawl logs 5 Macrourus_holotrachys Species abundance Count NA AAD Historical Fish Database checked against trawl logs 6 Paradiplospinus_gracilis Species abundance Count NA AAD Historical Fish Database checked against trawl logs 7 Bathyraja_eatonii Species abundance Count NA AAD Historical Fish Database checked against trawl logs 8 Zanclorhynchus_spinifer Species abundance Count NA AAD Historical Fish Database checked against trawl logs 9 Lycodapu_antarcticus Species abundance Count NA AAD Historical Fish Database checked against trawl logs 10 Bathyraja_murrayi Species abundance Count NA AAD Historical Fish Database checked against trawl logs 11 Lepidonotothen_mizops Species abundance Count NA AAD Historical Fish Database checked against trawl logs 12 Muraenolepis_sp Species abundance Count NA AAD Historical Fish Database checked against trawl logs 13 Paraliparis_operculosus Species abundance Count NA AAD Historical Fish Database checked against trawl logs 14 Gobionotothen_acuta Species abundance Count NA AAD Historical Fish Database checked against trawl logs 15 Melanostigma_gelatinosum Species abundance Count NA AAD Historical Fish Database checked against trawl logs 16 Latitude Latitude of trawl midpoint Decimal degree NA Midpoint of trawl from trawl logs 17 Longitude Longitude of trawl midpoint Decimal degree NA Trawl logs 18 Geomorphology Geomorphology Bank, Plateau, Plateau_slope 0.1 degree Polar_Environmental_Data 19 Season Season/year Autumn_1990, Summer_1992, Spring_1993 NA Trawl logs 20 Seafloor_temperature Average temperature near seafloor from CAISOM model Degrees C 0.1 degree Polar_Environmental_Data 21 SST_spatial_gradient Spatial gradient of sst_summer_climatology (from MODIS 2002-2010) Degrees C/ km 0.1 degree Polar_Environmental_Data 22 SST_summer_climatology Average austral summer SST (from MODIS 2002-2010) Degrees C 0.1 degree Polar_Environmental_Data 23 Seafloor_salinity Average bottom salinity PSU 0.5 degree CSIRO Atlas of Regional Seas: www.cmar.csiro.au/cars 24 Seafloor_salinity_SD Standard deviation of bottom salinity PSU 0.5 degree CSIRO Atlas of Regional Seas: www.cmar.csiro.au/cars 25 Surface_temperature Average of daily surface temperature Degrees C 0.25 degree Calculated from NOAA OI SST v2 (1982- 2014)* 26 Surface_temperature_var Variance in daily surface temperature Degrees C 0.25 degree Calculated from NOAA OI SST v2 (1982- 2014)* 27 Surface_temperature_var_ds Variance after removing seasonal cycle (detrended) in daily surface temperature Degrees C 0.25 degree Calculated from NOAA OI SST v2 (1982- 2014)* 28 Surface_temperature_trend Slope of linear regression over timeseries Degrees C/ year 0.25 degree Calculated from NOAA OI SST v2 (1982- 2014)* 29 Chlorophyll_a_yearly_mean Standard deviation of annual chla mean mg/m3 0.2 degree mean of yearly mean chl-a (1997-2010) from corrected L3 SeaWiFs data ^ 30 Chlorophyll_a_yearly_SD Average of annual chla mean mg/m3 0.2 degree mean of yearly mean chl-a (1997-2010) from corrected L3 SeaWiFs data ^ 31 Haul_depth Average depth of haul m NA Trawl logs 32 Bathymetry_slope Seafloor slope Degrees 0.1 degree Polar_Environmental_Data 33 Seafloor_current_speed Average current speed near seafloor from CAISOM model m/s2 0.1 degree Polar_Environmental_Data 34 Chlorophyll_a_summer_climatology Average austral summer chla concentration mg/m3 0.1 degree Polar_Environmental_Data 35 Haul_Index Haul Identifier NA AAD Historical Fish Database ^ Daily SeaWiFs values corrected for the Southern Ocean using: Johnson, R., et al. (2013). "Three improved satellite chlorophyll algorithms for the Southern Ocean." Journal of Geophysical Research: Oceans 118(7): 3694-3703. *NOAA High Resolution SST data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at http://www.esrl.noaa.gov/psd/ * Reynolds, Richard W., Thomas M. Smith, Chunying Liu, Dudley B. Chelton, Kenneth S. Casey, Michael G. Schlax, 2007: Daily High-Resolution-Blended Analyses for Sea Surface Temperature. J. Climate, 20, 5473-5496. Reynolds, Richard W., Thomas M. Smith, Chunying Liu, Dudley B. Chelton, Kenneth S. Casey, Michael G. Schlax, 2007: Daily High-Resolution-Blended Analyses for Sea Surface Temperature. J. Climate, 20, 5473-5496.