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. 2013 Aug 13;8(8):e71406. doi: 10.1371/journal.pone.0071406

Table 1. Description and ranges of habitat-specific variables used to model seabird abundance at 3-km bins.

Variable Description Mean±SD min-max values CV
Oceanographic
SST (°C) Average surface temperature for 3-km bin 12.6±1.62 8.9–16 0.13
SSS (psu) Average surface salinity for 3-km bin 33.3±0.48 29.7–34 0.02
SSF (mg/m3 ) Average surface fluorescence for 3-km bin 1.08±2.23 0–14.9 2.06
Bathymetric
Dist_Land (m) Distance from bin midpoint to mainland 27016±9396 1210–47790 0.34
Dist_200 (m) Distance from bin midpoint to 200m-isobath 10759±9315 23–47260 0.86
Dist_SEFI (m) Distance from bin midpoint to South East Farallon Island 29062±17211 1273–65366 0.59
Climate Indices
NPGO Monthly North Pacific Gyre Oscillation value 0.51±0.94 1.4–1.9
PDO Monthly Pacific Decadal Oscillation value 0.1±1.01 1.8–1.86
SOI Monthly Southern Oscillation Index value 0.41±1.76 2.7–4.3
UI value Ten-day average to last day on monthly cruise 93.0±40.2 6.4–171.5 0.43
Detection Biases
Strip width (m) Observer field of vision per 3-km bin 167.8±79.2 50–300 0.47
Sea State Observed Beaufort scale conditions 2.56±1.28 0–6 0.50
Swell Height (m) Observed swell height per 3-kmbin 1.98±5.07 0–8 5.91
Visibility Observer visibility per 3-km bin 5.51±2.04 0–9 0.38
Time of Day Hour:Min of survey bin completion 1217±0304 0608–2005 0.24
Cloud Cover Observed values recorded per 3-km bin 5.21±3.37 0–9 0.65