Core feeding areas (50% contours of foraging locations) of black-legged kittiwakes from St. Paul and St. George Islands during trips to marine habitats.

<p>Trips to the shelf (A), and to the basin (B). Patterns: red  =  St. Paul; black  =  St. George; Years: 2008 =  dots, 2009  =  crossed lines, 2010  =  diagonal lines.</p

Acoustically measured biomass density (g/m²) of juvenile pollock integrated from 100 m to the surface.

<p>Data were collected from mid-July to mid-August in each year over 110 transects of 10 km in length that were randomly placed within 200 km of St. George Island. Map surfaces were generated using minimum curvature interpolation.</p

Linear mixed model of trip distance of black-legged kittiwakes with colony (St. Paul = STP; St. George = STG), sex and year (2008, 2009, 2010) as fixed factors and individual as a random factor.

<p>Statistically significant (<i>P</i> < 0.025 after Bonferroni correction) relationships are shown in bold (see text for post-hoc comparisons).</p

Breeding performance and physiological stress of black-legged kittiwakes at St. Paul and St. George islands, and eddy kinetic energy in the basin area during 2008-10.

<p>Chick-feeding frequency (A), fledging success (B), adult nutritional stress levels (C), and July-mean eddy kinetic energy (D). Decreasing stress levels of St. George birds coincide with the increase in EKE between 2008 and 2010.</p

Correlations between eddy kinetic energy (mean in July), prey occurrence in diets and productivity of black-legged kittiwakes nesting at the Pribilof Islands (6–10 year-data sets, see Appendix S1).

<p>Significant relationships indicated in bold.</p

Summary statistics of data-logger deployment and the total number of trips conducted by black-legged kittiwakes at the two Pribilof Islands.

<p>Summary statistics of data-logger deployment and the total number of trips conducted by black-legged kittiwakes at the two Pribilof Islands.</p

Frequency histograms of foraging locations of black-legged kittiwakes from St. Paul and St. George Islands according to time of day and marine habitat (shelf and basin) of the southeastern Bering Sea.

<p>The rectangle indicates the dark (black), twilight (grey), and daylight (white) periods.</p

Diet composition of chick-rearing kittiwakes from St. George (<i>n</i> = 41 samples in 2008; <i>n</i> = 26 in 2009; <i>n</i> = 51 in 2010) and St. Paul Islands (<i>n</i> = 32 in 2008; <i>n</i> = 29 in 2009; <i>n</i> = 35 in 2010).

<p>Categorization of prey by domain location (shelf and basin) was based on diet of tracked birds (Fig. 6).</p