Table 2 Characteristics of the contribution to the preyscape by crystal krill and Antarctic silverfish, with sampling passes two and three divided into shorter periods.

From: Drivers of concentrated predation in an Antarctic marginal-ice-zone food web

 

Fast Ice Interior Stations

Fast Ice Edge Stations

Mean silverfish Sv

Mean silverfish depth, m

Mean krill Sv

Mean krill depth, m

Mean silverfish Sv

Mean silverfish depth, m

Mean krill Sv

Mean krill depth, m

1 (14 Dec)

−80.2 (−80.4, −80.0)

81.9 (80.1, 83.6)

−88.7 (−89.8, −87.7)

37.4 (33.3, 41.9)

−80.6 (−81.6, −79.5)

84.8 (74.4, 93.8)

−81.8 (−81.9, −81.7)

91.4 (90.7, 92.0)

2 (20 Dec)

−98.4 (−99.7, −97.1)

16.3 (13.4, 19.3)

−82.0 (−82.3, −81.6)

32.6 (29.4, 37.5)

none

none

−80.6 (−80.8, −80.4)

89.8 (89.6, 90.1)

3 (25 Dec)

−92.6 (−92.7, −92.4)

126 (124, 127)

−75.1 (−75.2, −75.0)

29.0 (28.8, 29.2)

none

none

−88.3 (−88.6, −87.9)

24.9 (24.0, 26.2)

4 (30 Dec)

−94.3 (−94.7, −93.9)

77.5 (73.7, 81.2)

−93.8 (−94.2, −93.4)

58.6 (55.3, 61.6)

−95.0 (−95.5, −94.5)

25.2 (24.8, 25.7)

−98.4 (−99.5, −97.4)

23.0 (21.9, 24.2)

5 (4 Jan)

none

none

−73.0 (−73.3, −72.6)

24.6 (23.1, 26.0)

none

none

−78.4 (−78.6, −78.1)

50.1 (49.1, 51.1)

  1. Boostrap-calculated 95% confidence internals (10000 replications) are shown in parentheses. Sv = mean acoustic volume backscattering strength (dB re m−1; smaller values (e.g., −100) indicate weaker backscatter than larger values (e.g., −83).