Table 3. Foraging parameters for Magellanic penguins with fully documented foraging trips (n = 31) during the early chick-rearing period, according to colony. Average values are given (SD), along with range [Max-Min]. Mean values and significant statistical test are showed in bold.

Colony (n)	Punta Norte (10)	Bahía Bustamante (6)	Puerto Deseado (4)	Puerto San Julián (11)	F(df = 30)	P
Duration of the foragingphase (h)*	11.6 (3.0) [16.5–7.7]d	12.5 (4.8) [19.7–6.0]	16.7 (8.4) [28.1–8.0]	17.0 (4.1) [25.2–12.9]d	3.1	0.0431
No of foraging dives	402.4 (135.6) [647–235]d	322.3 (100.2) [402–136]a,c	629.8 (306.3) [1074–372]a	730.7 (360.8) [1683–360]c,d	6.8	0.0015
Diving rate (foragingdives h−1)*	34.4 (5.9) [43.0–27.8]	26.3 (4.7) [30.9–19.1]c	41.4 (19.0) [68.1–22.9]	42.3 (13.8) [70.5–27.3]c	3.6	0.0262
Time underwater (h)	8.0 (1.8) [10.7–5.6]	7.9 (2.5) [10.4–4.0]	12.6 (6.0) [20.6–6.0]	10.7 (3.0) [15.8–7.3]	3.2	0.0399
Percentage timediving (%)*	69.5 (4.3) [76.1–62.5]d	64.2 (7.6) [72.7–52.5]a	75.9 (3.1) [80.2–73.2]a,b	62.8 (6.9) [69.3–47.3]b,d	5.9	0.003
Total wiggles	294.7 (105.7) [457–178]e	265.7 (100.3) [353–124]a	895.1 (555.9) [1602–320]a,b,e	431.0 (174.1) [718–212]b	6.7	0.0017
Wiggles per dive	0.74 (0.13) [0.94–0.55]e	0.82 (0.15) [0.94–0.54]a	1.43 (0.60) [1.98–0.59]a,b,e	0.61 (0.13) [0.81–0.38]b	8.6	0.0004
CPUT (wiggles h−1)†	36.1 (6.4) [44.3–24.5]e	33.1 (3.9) [37.4–26.5]a	67.9 (19.2) [90.1–50.1]a,b,e	40.0 (11.5) [65.9–27.6]b	9.2	0.0002
Wet mass consumedper dive (g)	14.6 (2.6) [18.5–10.9]d,e,f	26.2 (4.6) [29.8–17.1]a,c,f	10.6 (4.4) [14.6–4.3]a,b,e	6.1 (1.3) [8.1–3.8]b,c,d	43.1	<0.0001
Energy consumedper dive (kJ)	80.4 (14.1) [102.1–60.1]d,e,f	119.7 (21.2) [136.5–78.1]a,c,f	56.0 (23.4) [77.5–23.0]a,e	41.4 (9.1) [54.9–25.8]c,d	35.5	<0.0001
Total wet massconsumed (kg)	5.8 (2.1) [9.0–3.5]	8.5 (3.2) [11.2–4.0]c	6.6 (4.1) [11.9–2.4]	4.3 (1.7) [7.2–2.1]c	3.6	0.0256
Total energyconsumed (MJ)	32.2 (11.5) [49.8–19.4]	38.7 (14.6) [51.3–18.1]	35.1 (21.8) [62.8–12.6]	29.2 (11.8) [48.6–14.4]	0.67	0.5809

One-way ANOVA was used to compare between colonies, with Student-Newman-Keuls (S-N-K) post-test. The significant differences (P<0.05) in the results of post-hoc S-N-K’s contrast are shown by the superscript letters as follow:

^aBahía Bustamante vs. Puerto Deseado;

^bPuerto Deseado vs. Puerto San Julián;

^cBahía Bustamante vs. Puerto San Julián;

^dPuerto San Julián vs. Punta Norte;

^ePuerto Deseado vs. Punta Norte; and,

^fBahía Bustamante vs. Punta Norte.

^*Calculated using a corrected time at sea value, subtracting the hours of darkness from the total time at sea. †Number of wiggles per hour underwater.