Thermal plasticity in Drosophila melanogaster: A comparison of geographic populations

Table 3 Results of ANCOVAs on the cumulative productivity over time of the populations at the four experimental temperatures. The cumulative productivity over time was approximated by two degree polynomials passing through the origin. Location is a fixed effect, population is nested within location.

a) ANCOVA at 12°C. The population from Saõ Tomè had no offspring production and was omitted from the analysis.
Source of variation	df	MS	F
Polynomial regression	2	1888	3514 ***
Polynomial regression X population	6	70	130 ***
Residuals	83	0.5
b) ANCOVA at 18°C, 28°C and 31.2°C.
		18°C		28°C		31.2°C
Source of variation	df	MS	F	MS	F	MS	F
Polynomial regression	2	101664	13899***	113109	16759***	660	1412***
Polynomial regression X location	2	592	0.597	17	0.01	35.9	4.8 †
Polynomial regression X population within location	6	991	135.5***	1631	241.6***	7.5	16 ***
Residuals	126/100/24	7		7		0.5

† 0.10 <P < 0.05; ***P < 0.001; df, degrees of freedom; MS, mean square; F, variance ratio

ISSN: 2730-7182