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Table 2 Egg cooling and re-warming parameters (mean ± SD) of snow petrels incubating artificial eggs containing data loggers during the austral summer of 2013–2014 at Dumont d’Urville Station, Antarctica

From: Comparative egg attendance patterns of incubating polar petrels

Egg condition N Elapsed time (min) ΔT (°C) Rate of ΔT (°C min−1)
Cooling 9 90.9 ± 29.3 − 23.0 ± 4.3 − 0.27 ± 0.08
(min, max) (67.1, 146.3) (− 12.8, − 26.6) (− 0.18, − 0.40)
Re-warming 8 75.8 ± 32.1 23.7 ± 6.4 0.33 ± 0.10
(min, max) (43.7, 148.7) (12.2, 32.3) (0.19, 0.45)
  1. N is the number of egg cooling or re-warming events recorded from seven petrel nests. Elapsed time represents the duration of egg cooling or re-warming based on measured temperature changes to a steady state. ΔT represents the total change in temperature of the egg and rate of ΔT is provided for simple comparison between conditions. However, eggs cooled and re-warmed in a curvilinear manner (see Fig. 3)