Table 4. Mean (± S.D) diving parameters by year, season, and tagging location (ANNU - Año Nuevo, California and SABE - Islas San Benito, Mexico).
| Season | Year | # Dives | % Diving | Depth - m | Duration - min | PDI - min | % Transit | % Foraging | % Drift | % Benthic |
| Post-breeding | 2004 | 5121.4 (412.6) | 89.1 (1.4) | 433.1 (79.9) | 20.9 (1.5) | 2.5 (0.2) | 26.4 (4.5) | 53.4 (20.9) | 6.0 (2.7) | 14.1 (16.7) |
| 2005 | 4609.1 (675.8) | 90.4 (1.3) | 499.7 (85.9) | 22.0 (2.1) | 2.3 (0.3) | 26.3 (8.5) | 55.5 (14.6) | 7.5 (3.4) | 10.6 (13.7) | |
| 2006 | 4650.9 (686.3) | 90.9 (1.7) | 503.4 (50.2) | 21.6 (1.5) | 2.2 (0.4) | 28.1 (8.5) | 58.0 (12.4) | 8.1 (3.5) | 5.9 (5.5) | |
| SABE 2006 | 4370.1 (1387.2) | 89.5 (2.9) | 477.7 (86.4) | 23.0 (5.2) | 2.6 (0.4) | 15.1 (6.9) | 56.6 (28.4) | 8.1 (4.1) | 20.2 (23.2) | |
| 2007 | 4473.9 (694.9) | 91.3 (1.1) | 556.0 (39.0) | 21.7 (2.8) | 2.0 (0.2) | 34.1 (11.3) | 53.9 (16.3) | 6.6 (2.0) | 5.4 (14.4) | |
| 2008 | 4580.1 (786.3) | 90.9 (1.3) | 541.6 (40.2) | 21.4 (1.8) | 2.1 (0.2) | 35.0 (11.6) | 54.6 (12.4) | 7.0 (2.6) | 3.4 (1.9) | |
| 2009 | 4222.9 (804.2) | 91.7 (0.9) | 540.6 (39.2) | 22.4 (2.2) | 2.0 (0.2) | 34.5 (10.4) | 54.6 (10.9) | 6.9 (1.8) | 4.0 (1.7) | |
| 2010 | 4356.3 (474.3) | 91.2 (0.8) | 547.7 (38.5) | 22.4 (1.5) | 2.2 (0.5) | 30.6 (9.2) | 58.1 (9.7) | 7.2 (2.6) | 4.1 (1.8) | |
| ANNU PB Mean | 4513.7 (708.3) | 91.0 (1.3) | 527.6 (61.6) | 21.9 (2.0) | 2.2 (0.3) | 30.6 (10.4) | 56.0 (13.4) | 7.2 (2.8) | 6.1 (9.8) | |
| Post-molting | 2004 | 12121.2 (1249.6) | 91.0 (0.8) | 487.4 (44.8) | 24.3 (1.7) | 2.4 (0.3) | 30.5 (9.3) | 51.7 (13.7) | 11.5 (2.5) | 6.3 (5.0) |
| 2005 | 11677.4 (1140.8) | 90.2 (1.3) | 497.4 (54.2) | 23.6 (3.1) | 2.5 (0.3) | 31.5 (11.7) | 49.8 (14.1) | 11.3 (3.7) | 7.4 (9.1) | |
| SABE 2005 | 12591.3 (1070.1) | 89.0 (2.0) | 501.4 (64.9) | 21.9 (2.1) | 2.6 (0.3) | 29.3 (12.2) | 53.3 (12.3) | 10.1 (3.0) | 7.4 (10.2) | |
| 2006 | 11702.1 (942.9) | 90.3 (1.4) | 503.6 (27.9) | 22.9 (2.8) | 2.4 (0.3) | 30.7 (10.1) | 50.2 (15.2) | 14.2 (6.5) | 4.9 (3.2) | |
| 2007 | 11643.1 (2008.4) | 90.8 (0.9) | 504.7 (35.7) | 24.2 (2.9) | 2.4 (0.3) | 32.4 (5.6) | 51.1 (7.5) | 11.0 (2.8) | 5.5 (4.0) | |
| 2008 | 11558.2 (810.4) | 90.7 (0.9) | 512.5 (26.8) | 25.2 (1.7) | 2.7 (0.4) | 27.6 (8.1) | 56.6 (9.0) | 11.5 (1.6) | 4.2 (2.2) | |
| 2009 | 10662.4 (1278.2) | 90.9 (1.0) | 525.1 (21.5) | 25.7 (2.2) | 2.6 (0.5) | 26.7 (5.8) | 57.6 (7.9) | 11.4 (1.2) | 4.3 (2.4) | |
| 2010 | 11246.1 (756.6) | 91.5 (0.8) | 523.8 (26.8) | 26.1 (2.5) | 2.7 (0.5) | 27.1 (6.9) | 56.9 (7.3) | 12.2 (3.3) | 3.9 (2.6) | |
| ANNU PM Mean | 11622.2 (1281.4) | 90.8 (1.0) | 503.0 (40.9) | 24.5 (2.5) | 2.5 (0.4) | 30.4 (8.8) | 51.8 (11.8) | 12.0 (3.6) | 5.8 (5.4) | |
| Overall ANNU Mean | – | 90.9 (1.2) | 516.8 (53.2) | 23.1 (2.6) | 2.3 (0.4) | 30.6 (9.7) | 54.0 (12.9) | 9.5 (4.0) | 5.9 (7.8) | |
| Overall SABE Mean | – | 89.3 (2.2) | 496.2 (70.7) | 22.1 (3.6) | 2.6 (0.4) | 25.6 (13.7) | 53.7 (19.3) | 9.1 (3.6) | 11.7 (17.1) | |
‘PDI’ refers to the duration of the post-dive interval. The last 4 columns indicate the proportion of each functional dive type. (*) denotes significant differences across seasons. Inter-annual variation was not significant for any parameter. SABE animals were not included in the statistical comparisons.