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Table 2 Comparison of mean dive parameters from two periods winter (March and April, whales BW1 to BW4) and spring (May, whales BW5 to BW9) from this study and from earlier data collected from bowhead whales in Disko Bay between 2001-2006, also reported in [2]

From: Winter and spring diving behavior of bowhead whales relative to prey

Dive parameter Weight Winter Spring Significance
Data from this study:
Mean depth of U-dives >60 m (m) Number of U-dives 143 77 **
Mean depth U-dives <60 m (m) Number of U-dives 31 30  
Max depth of U-dives (m) Number of U-dives 342 184 **
Max depth of V-dives (m) Number of V-dives 381 248 *
Vertical speed of U-dives; descent rate (ms-1) Number of U-dives 0.65 1.28 *
Vertical speed of U-dives; ascent rate (ms-1) Number of U-dives -0.68 -0.72  
Vertical speed of V-dives; descent rate (ms-1) Number of V-dives 0.45 0.30  
Vertical speed of V-dives; ascent rate (ms-1) Number of V-dives -0.41 -0.27  
Distance to seabed of V-dives (m) Number of V-dives 106 230  
Distance to seabed of U-dives (m) Number of U-dives 127 77 *
Overall dive rate (dives hr-1) Deployment duration 2.07 4.76 ***
Dive rate of V-dives (dives hr-1) Deployment duration 1.15 0.95  
Dive rate of U-dives (dives hr-1) Deployment duration 1.86 4.75 ***
Bottom time of U-dives (dives hr-1) Number of U-dives 1092 499 ***
Proportion of time spent in the bottom of U-dives (%) Number of U-dives 38 33  
Duration of all dives below 20 m (min) Number of U-dives 19.7 9.5 ***
Data from [2], n = 6 in winter (April) and 8 in spring (May):   April May  
Mean depth of all dives below 12 m (m) Deployment duration 81 68  
Max depth of all dives below 12 m (m) Deployment duration 238 233  
Maximum duration of all dives below 12 m (min) Deployment duration 39.0 21.6 ***
Duration of all dives below 12 m (min) Deployment duration 15.1 9.7 **
  1. *Significantly different by Student’s t test at 0.05 level, **at 0.01 level and ***at 0.001 level.