Skip to main content

Table 2 Dive parameters used for the calculations of energy landscapes corresponding to Gentoo Penguin Pygoscelis papua. The study was conducted on penguins breeding at New Island (Falkland/Malvinas Is.), during chick guard (December) in 2013 and 2014. Only the first foraging trip of each individual was included in the calculations in order to avoid individuals with more than one trip having more weight in the analyses. For sample sizes see Table 1. For means, ranges are given in brackets, while for medians 75 and 25% quartiles are given

From: How animals distribute themselves in space: variable energy landscapes

  2013 2014
South End South End North End
Maximum dive depth [m] 188.3 178.2 156.3
Mean number of dives per foraging trip (MND) 298 (176–674) 265 (81–648) 280 (192–343)
 Mann-Whitney Rank Test between seasons T = 50.000 P = 0.405  
 Mann-Whitney Rank Test between colonies   T = 36.000 P = 0.445
Mean dive duration (DD), benthic dives [s] 166 (112–215) 175 (145–244) 180 (125–213)
 Mann-Whitney Rank Test between seasons T = 96 P = 0.002  
 Mann-Whitney Rank Test between colonies   t = 0.367 P = 0.721
Mean dive duration (DD), pelagic dives [s] 109 (87–158) 118 (112–140) 123 (108–146)
 Mann-Whitney Rank Test between seasons t = −1.610 P = 0.126  
 Mann-Whitney Rank Test between colonies   t = −0.409 P = 0.690
Median dive event maximum depth [m] 21.9 (8.0–97.1) 45.1 (14.2–93.2) 45.2 (16.0–91.2)
 Mann-Whitney Rank Test between seasons T = 54,929,247.5 P < 0.001  
 Mann-Whitney Rank Test between colonies   T = 34,821,241.0 P = 0.985
Median dive depth of pelagic dives [m] 15.8 (6.3–77.0) 12.7 (5.8–41.2) 21.1 (9.2–48.9)
 Mann-Whitney Rank Test between seasons T = 1,203,123.5 P < 0.001  
 Mann-Whitney Rank Test between colonies   T = 834,201.5 P < 0.001
Mean proportion of benthic dives (pBD) [%] 24 (10–40) 54 (22–72) 48 (30–76)
Mean proportion of pelagic dives (pPD) [%] 76 (61–90) 46 (27–78) 52 (24–70)
 t-test between seasons t = −3.828 P = 0.002  
 t-test between colonies   t = −0.426 P = 0.678
Minimum benthic bottom time (mBBT) [s] 2 3 2
  1. Statistically significant values are marked bold