Figure 1.
Trawl and longline sampling locations in Monterey Bay.
National Marine Fisheries Service–Southwest Fisheries Science Center–Fisheries Ecology Division bottom set trawl (n = 80) and longline (n = 106) survey locations in the greater Monterey Bay region.
Table 1.
Details of sampling surveys conducted in the western Gulf of Alaska and off central California.
Figure 2.
Trawl locations among regions in the west-central Gulf of Alaska.
Alaska Department of Fish and Game trawl survey regions located within the larger study site in the western Gulf of Alaska. The total number of trawls conducted during 2003–2012 among regions was, as follows: Kodiak Island (n = 1836), Shelikof Strait (n = 278), Alaska Peninsula (n = 1368), and Kamishak Bay (n = 160).
Table 2.
Spatial analysis results for the central California skate assemblage.
Figure 3.
Hot and cold spot maps for Beringraja binoculata and Raja rhina.
Getis-GI Hot Spot Analysis Z-score plots of catch-per-unit-effort (kg/km) for the hardnose skates, Beringraja binoculata (A) and Raja rhina (B), off central California, as calculated from NMFS–AFSC and NMFS–NWFSC trawl surveys conducted during 1997–2010.
Figure 4.
Hot and cold spot maps for Raja inornata, R. stellulata, and Bathyraja kincaidii.
Getis-GI Hot Spot Analysis Z-score plots of catch-per-unit-effort (kg/km) for the California skate, Raja inornata (A); starry skate, R. stellulata (B), and sandpapaer skate, Bathyraja kincaidii (C) off central California, as calculated from NMFS–AFSC and NMFS–NWFSC trawl surveys conducted during 1997–2010.
Figure 5.
Hot and cold spot maps for species richness of all Californian skates.
Getis-GI Hot spot Analysis Z-score plot of species richness of skates collected from NMFS–AFSC and NMFS–NWFSC trawl surveys conducted during 1997–2010.
Table 3.
ZIP model predictions of median and maximum count, and associated depth and latitude ranges, and GAM model predictions of temperature for central California skate species/life stages throughout the study site.
Table 4.
ZIP model predictions of median and maximum count, and associated depth ranges, and GAM model predictions of temperature for life stages of central California skates in Monterey Bay.
Table 5.
Descriptive statistics, depth range, and mesoscale habitat electivity for central California skates as calculated from manned submersible data in the greater Monterey Bay region.
Figure 6.
Original and updated habitat suitability probability profiles for Raja inornata.
Reconstruction of original (A) and updated (B) habitat suitability probability profiles for adult and transitional/adult Raja inornata throughout the U.S. West Coast. The original profile (A) was depicted in the 2005 Essential Fish Habitat Amendment to the Pacific Coast Groundfish Fishery Management Plan (Anonymous 2005). The black line offshore depicts the limit of the U.S. EEZ.
Table 6.
Spatial analysis results for the western Gulf of Alaska skate assemblage.
Figure 7.
Hot and cold spot maps for Beringraja binoculata and Raja rhina.
Getis-GI Hot Spot Analysis Z-score plots of catch-per-unit-effort (kg/km) for the hardnose skates, Beringraja binoculata (A) and Raja rhina (B), in the western Gulf of Alaska, as calculated from NMFS–AFSC trawl surveys conducted during 1999–2011.
Figure 8.
Hot and cold spot maps for Bathyraja aleutica, B. interrupta, and B. parmifera.
Getis-GI Hot Spot Analysis Z-score plots of catch-per-unit-effort (kg/km) for the softnose skates, Bathyraja aleutica (A), B. interrupta (B), and B. parmifera (C), in the western Gulf of Alaska, as calculated from NMFS–AFSC trawl surveys conducted during 1999–2011.
Figure 9.
Hot and cold spot maps for species richness of Alaskan skates.
Getis-GI Hot Spot Analysis Z-score plot of species richness of skates collected during combined NMFS–AFSC trawl surveys conducted in the western Gulf of Alaska during 1999–2011.
Table 7.
ANOVA and t-test comparisons of mean total length among co-occurring skates in the western Gulf of Alaska.
Table 8.
Logistic model predictions of median and maximum count, and associated depth and longitude ranges, and GAM model predictions of temperature for life stages of skates in the western Gulf of Alaska.
Table 9.
ZIP model predictions of median and maximum count, and associated depths for skates among surveyed regions in the western Gulf of Alaska.