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Table 3 Comparison of dive characteristics during periods when the sonar tag was not pinging (NP) vs. pinging (P)

From: Development of an animal-borne “sonar tag” for quantifying prey availability: test deployments on northern elephant seals

Dive metric Seal #1 Seal #2 Seal #3 Seal #4
Maximum depth NS 0.200 NP > P** 0.182 NP > P*** 0.353 NS 0.080
Dive duration NS 0.242 NP > P*** 0.231 NP > P*** ° 0.338 NS 0.083
Bottom time P > NP* 0.317 NP > P*** ° 0.334 NP > P*** 0.317 NS 0.056
Descent rate P > NP* 0.325 NP > P** 0.182 NS 0.129 NP > P** ° 0.123
Ascent rate NS 0.175 NS 0.123 NP > P*** 0.297 NS 0.047
Post-dive interval NS 0.133 NS 0.143 NP > P*** 0.228 NS 0.040
# Inflections descent phase NS 0.033 NS 0.021 NS 0.021 NS 0.010
# Inflections bottom phase NP > P*** 0.467 NP > P*** 0.299 NS 0.124 NS 0.059
# Inflections ascent phase NS 0.050 NS 0.042 NS 0.028 NS 0.024
  1. Kolmogorov-Smirnov tests were used to compare the distribution of these metrics comparing all dives made by each seal with the system pinging relative to when it was not. Table entries provide the Kolmogorov-Smirnov test statistics and for comparisons where dive metrics differed significantly indicate whether the metric was greater with the system pinging (P > NP) or not pinging (NP > P) and indicate the significance level. Kolmogorov-Smirnov tests were also conducted on the average of metrics for all dives conducted during a pinging or non-pinging interval. The small number of such intervals limits the power of these tests, which mostly found non-significant differences, other than three tests (denoted via °) where differences were significant at the p < 0.05 level
  2. NS non-significant
  3. *p < 0.05; **p < 0.01; ***p < 0.001