Table 1. Environmental variables.
Variables used to analyze seabird distribution in GFNMS and CBNMS per 3-km survey bin for 37 ACCESS cruises from 2004–2013.
| Variable | Mean ± SD | Min−Max values | Description | Data Source |
|---|---|---|---|---|
| Oceanography | ||||
| SSF | 2.5 ± 6.7 | −8.6−28.1 | Avg. sea surface fluorescence (rfu) (in situ) | ACCESS Survey Strip Transect (1–6 meters from surface) |
| SSS | 33.4 ± 0.36 | 29.7−34.1 | Avg. sea surface salinity (mg/m³) (in situ) | ACCESS Survey Strip Transect (1–6 meters from surface) |
| SST | 12.3 ± 1.7 | 8.2−16.4 | Avg. sea surface temperature (°C) (in situ) | ACCESS Survey Strip Transect (1–6 meters from surface) |
| Bathymetric Features | ||||
| Distance to Cordell Bank | 37.6 ± 24.9 | 0.8−115.5 | Distance from bin midpoint to Cordell Bank midpoint (km) | See Source for Average Depth |
| Distance to 200-m isobath | 11.6 ± 10.3 | 0.02−47.3 | Distance from bin midpoint to 200-m isobath (km) | See Source for Average Depth |
| Depth | 179.2 ± 240.0 | 7.6–2075.6 | Avg. depth (m) | Department of Fish and Wildlife. Available from: ftp://ftp.dfg.ca.gov/R7_MR/BATHYMETRY/ (Accessed March, 2014). |
| Contour Index | 0.2 ± 0.2 | 0−1 | (max depth—min depth)/max depth per bin | See Source for Average Depth |
| Terrestrial Features | ||||
| Distance to mainland | 26.5 ± 10.5 | 1.2−50.5 | Distance from bin midpoint to nearest mainland (km) | United States Census Bureau. Available from: http://www.census.gov/geo/maps-data/data/cbf/cbf_counties.html (Accessed March, 2014). |
| Distance to island | 25.9 ± 16.4 | 0.1−89.4 | Distance from bin midpoint to nearest island (km) | United States Census Bureau. Available from: http://www.census.gov/geo/maps-data/data/cbf/cbf_counties.html (Accessed March, 2014). |
| Climate Indices | ||||
| UI | 183.7 ± 71.3 | 46−339.5 | Monthly Upwelling Index Value | Pacific Fisheries Environmental Laboratory. Available from: http://www.pfeg.noaa.gov/products/PFEL/modeled/indices/upwelling/NA/data_download.html (Accessed March, 2014). |
| NPGO | 0.6 ± 0.9 | −1.7−2.1 | Monthly North Pacific Gyre Oscillation Value | Emanuele DiLorenzo. Available from: http://eros.eas.gatech.edu/npgo/ (Accessed March, 2014). |
| PDO | −0.4 ± 1.0 | −2.2−1.9 | Monthly Pacific Decadal Oscillation Value | Joint Institute for the Study of the Atmosphere and Ocean. Available from: http://jisao.washington.edu/pdo/PDO.latest (Accessed March, 2014). |
| SOI | 0.4 ± 1.6 | −2.7−4.3 | Monthly Southern Oscillation Index Value | CGD University Corporation for Atmospheric Research. Available from: http://www.cgd.ucar.edu/cas/catalog/climind/soi.html (Accessed March, 2014). |
| Detection Variables | ||||
| Sea State | 2.8 ± 1.4 | 0−6 | Observed Beaufort Scale conditions (in situ) | ACCESS Survey Strip Transect |
| Swell | 1.8 ± 4.0 | 0−8 | Observed swell height (m) (in situ) | ACCESS Survey Strip Transect |
| Visibility | 5.3 ± 2.0 | 0−6 | Observed visibility (in situ) | ACCESS Survey Strip Transect |
| Cloud Cover | 4.7 ± 3.4 | 0–8, 9 = sky obscured | Observed cloud cover (in situ) | ACCESS Survey Strip Transect |
| Time of Day | 12:19:00 ± 03:00 | 06:08–20:05 | Time of completion (hh:mm) | ACCESS Survey Strip Transect |