428
15.3.6.3 Moon Phases
Singer males were sighted in all moon phases, but despite small differences
(Fig. 15.21) there was no statistical difference between the four classes (Chi-Square
5% = 2,0; df = 3 p = 0,57), indicating no evident influences of this environmental
feature in the singing behavior along the study area.
12
10
8
6
4
2
0
Hg
Frequency
Hg/Eb Half Eb Eb/Lw
Tidal classes
Lw
Lw/Rs Half Rs Rs/Hg
Fig. 15.20 Frequency of humpback whale groups with singer males in different tidal classes,
between 2005 and 2009, in the North Coast, Brazilian breeding ground. (Hg High, Hg/Eb High/
Ebbing, Half Eb Half Ebbing, Eb/Lw Ebbing/Low, Lw Low, Lw/Rs Low/Rising, Half Rs Half
Rising, Rs/Hg Rising/High)
16
14
12
10
8
6
4
2
0
Full
Fading
New
Rising
Moon Phases
Frequency
Fig. 15.21 Frequency of humpback whale (Megaptera novaeangliae) groups with singer males in
different moon phases, between 2005 and 2009, in the North Coast, Brazilian breeding ground
M.R. Rossi-Santos