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(iv) Ae. aegypti ssp formosus wild-form, West Nile

Experimental regimes
LD 8:16 to LD 4:20, six females, studied from 3-4 days post-emergence (8-9 December 1968). Recorded in LD 8:16 for days five to seven then light-on delayed 4h to give LD 4:20 for days eight to eleven.
LD 12:12 to LD 16:8, six females, studied from 3-4 days post-emergence (8-9 December 1968). Recorded in LD 12:12 for days five to seven then light-on advanced 4h to give LD 16:8 for days eight to ten.
LD 20:4, six females, studied from 3-4 days post-emergence (8-9 December 1968) and recorded for days seven to nine.

Results
The activity patterns are shown in Figure A4 below.
The pattern in all five LD regimes is dominated by the E' peak. There is some activity in the subjective night, most obviously in LD 4:20. There is a clear M peak, and this becomes broader when L > 12h, peaking at 2-2.5 h after light-on in LD 20:4. It is clear that when L > 16h the E' peak falls progressively earlier as L increases, coming some 14-15h after light-on.

Figure A4

©1998, 2010 - Brian Taylor CBiol FSB FRES 11, Grazingfield, Wilford, Nottingham, NG11 7FN, U.K. Comments to dr.b.taylor@ntlworld.com

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