Erratum Mechanics, hydrodynamics and energetics of blue whale lunge feeding: efficiency dependence on krill density

In the first line of the 'Kinematics of diving and lunge feeding' section of the Results (p. 134), the number of blue whales that were tagged was incorrectly given as 265 – the correct number is 25. In Fig.A1 (p. 142), two mistakes were introduced. In the 'Energy in' column, krill energy density should have been given as 4600kJkg –1 (rather than 4600kJg –1). Also in the 'Energy in' column, the units were missing from the 'Energy obtained from ingested krill'; this should have read 'Energy obtained from ingested krill  4,868,640 kJ'. The correct version of the figure is shown below. Volume engulfed per lunge = 80 m 3 Total volume filtered per dive = 280 m 3 Number of lunges per dive = 3.5 Krill density = 4.5 kg m –3 Amount of krill obtained from lunges = 1260 kg Energy within ingested krill = 5,796,000 kJ Krill energy density = 4600 kJ kg –1 Energy obtained from ingested krill = 4,868,640 kJ Assimilation efficiency = 84% Mechanical energy required for one lunge = 945 kJ Mechanical energy required for all lunges = 3308 kJ Number of lunges per dive = 3.5 Metabolic energy required for all lunges = 22,053 kJ Metabolic energy cost of the foraging dive = 63,456 kJ Combined efficiency (0.15) Active metabolic rate (AMR) for dive and surface time = 41,403 kJ Energy in Energy out Shape and engulfment drag = 569 kJ Pre-engulfment acceleration = 376 kJ Efficiency = 77 699 Erratum In Table 3, the data from the 'Net energy gain' column were inadvertently repeated in the 'Energy loss, total' column. The correct version of Table 3, with the original data for the 'Energy loss, total' column, is shown below. We apologise sincerely to authors and readers for any inconvenience these errors may have caused. Table 3. Effects of prey density on the efficiency of blue whale foraging dives Krill density (kg m –3) Body length (m) Body mass (kg) Volume filtered, total (m 3) Krill obtained (kg) Gross energy gain (kJ) Energy loss, lunge (kJ) Energy loss, diving (kJ) Energy loss, total (kJ) Net energy gain (kJ) Efficiency, dive 0. All calculations correspond to foraging dives that average 200 m deep and a lunge frequency of 3.5 lunges per dive; dive duration was 9.8 min followed by a surface recovery period of 2.7 min, as determined from tag data (Table 1). …