Table 3 Threshold values for dive-based criterion applied to the eight main RBSA groups.

From: A quantitative, hierarchical approach for detecting drift dives and tracking buoyancy changes in southern elephant seals

RBSA order

2.1.3.4

2.1.4.3

2.4.1.3

3.1.2.4

3.1.4.2

3.2.1.4

3.4.1.2

4.2.1.3

Dive sign

−

+

−

+

−

+

−

+

−

+

−

−

+

−

+

t1

 

(0.7, 0.14)

<0.14

<0.15

<0.14

<0.14

<0.14

<0.14

 

<0.12

 

<0.14

<0.12

<0.9

<0.8

d1

<0.8

 

<0.7

 

<0.6

<0.8

<0.6

<0.85

<0.8

  

<0.8

 

<0.8

 

d4

  

<0.8

<0.6

 

<0.8

 

<0.7

<0.8

  

<0.8

<0.8

<0.8

 

mrratio

  

<0.15

<0.2

 

<0.15

   

<0.3

<0.2

<0.2

 

<0.2

 

ps1

>0.4

 

>0.4

 

>0.4

 

>0.4

<0.15

>0.4

      

t4

 

>0.9

       

>0.9

  

>0.85

>0.85

>0.8

mdepthr

     

(0.6,1.4)

 

(0.8,1.5)

 

(0.8,1.3)

    

(0.8, 2)

sratio

<10

       

<10

   

(2,7)

  

ps2

       

>0.4

 

>0.2

>0.45

    

ps3

           

<0.2

   

sdd

 

(0.13, 0.4)

       

(0.1, 0.3)

     

r1

     

<0

      

<0

  

r4

 

<0

             

mdepthbias

   

<0

           

meand

     

<0.8

         

d2

          

<0.8

    
  1. Only the cells of the criteria applied contain values. Values in brackets represent the lower (left) and upper (right) open thresholds of the threshold acceptance interval. Dive sign indicates criteria applied to negative (−) or positive (+) drift dives within groups. For full criteria description see Appendix A. In brief: {d1, d2, d3, d4} = ratio between the depth of the first, second, third and fourth inflection points and the maximum depth. {ps1, ps2, ps3} = proportion of the dive duration spent on the first, second, and third segments generated by the RBSA. sratio = ratio between the vertical rate of the descending phase and the vertical rate of the first segment post-descent. meand = mean value of {d1, d2, d3, d4} described above. sdd = standard deviation of {d1, d2, d3, d4}. {r1, r2, r3, r4} = residuals obtained by fitting a least square linear regression through the four inflection points {D1, D2, D3, D4}. mrratio = ratio between the smallest BSA residual and the maximum depth. mdepthbias = difference between the time at maximum depth and half of the total dive duration. mdepthr: ratio between the averaged depth of the inflection points {D1, D2, D3, D4} and the maximum depth. {t1, t2, t3, t4} = ratio between the time of each inflection point and the dive duration.
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