and weighted overall blubber conductivity was
subsequently calculated using equation (2):
k,=0.45 kA+0.18 k,+0.15 k,+0.22 kn, (2)
where k, is weighted overall blubber conductivity,
k is the conductivity of individual blubber samples
and the indexes A, B, C and D refer to the site of
sampling, as indicated in Fig. 1.
Statistics
Regression analyses were performed to establish a
mathematical relationship between conductivity and
lipid content and between conductivity and water
content, using the method of least squares. Per cent
water and lipid content were arcsin-transformed
(Sokal and Rohlf, 1981) to meet the assumption of
normality of this test. In addition, the non-parametric
Spearman’s Rank analysis was used to correlate the
blubber conductivity with per cent lipid and water
content. Thermal conductivity, thermal resistance
and blubber thickness data are presented as
means + SD. To examine the existence of regional
variations in blubber thermal conductivity, resistance
and thickness, an ANOVA test was used, before the
values of each measuring site were compared in pairs
using a Student’s t-test. In all analyses P < 0.05 was
considered to be significant.
RESULTS
The weighted overall blubber conductivity of the
nine animals (ko) ranged from 0.21 to 0.31 Wm-’
K-l, with an average value of 0.25 (SD = 0.03)
Wm-’ K-i (n = 9). The mean statistical (unweighted)
average was 0.24 (SD = 0.03) Wm-’ K-’ (n = 9).
We found significant variations in thermal conductivity
(P < O.OOS), blubber thickness (P < 0.05) and
thermal resistance (P c 0.005) among the different
sample sites (Table 1).
and weighted overall blubber conductivity wassubsequently calculated using equation (2):k,=0.45 kA+0.18 k,+0.15 k,+0.22 kn, (2)where k, is weighted overall blubber conductivity,k is the conductivity of individual blubber samplesand the indexes A, B, C and D refer to the site ofsampling, as indicated in Fig. 1.StatisticsRegression analyses were performed to establish amathematical relationship between conductivity andlipid content and between conductivity and watercontent, using the method of least squares. Per centwater and lipid content were arcsin-transformed(Sokal and Rohlf, 1981) to meet the assumption ofnormality of this test. In addition, the non-parametricSpearman’s Rank analysis was used to correlate theblubber conductivity with per cent lipid and watercontent. Thermal conductivity, thermal resistanceand blubber thickness data are presented asmeans + SD. To examine the existence of regionalvariations in blubber thermal conductivity, resistanceand thickness, an ANOVA test was used, before thevalues of each measuring site were compared in pairsusing a Student’s t-test. In all analyses P < 0.05 wasconsidered to be significant.RESULTSThe weighted overall blubber conductivity of thenine animals (ko) ranged from 0.21 to 0.31 Wm-’K-l, with an average value of 0.25 (SD = 0.03)Wm-’ K-i (n = 9). The mean statistical (unweighted)average was 0.24 (SD = 0.03) Wm-’ K-’ (n = 9).เราพบความแตกต่างอย่างมีนัยสำคัญในการนำความร้อน(P < O.OOS), blubber หนา (P < 0.05) และต้านทานความร้อน (P c 0.005) ระหว่างที่แตกต่างกันตัวอย่างเว็บไซต์ (ตาราง 1)
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