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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.

From: Thermal plasticity in Drosophila melanogaster: A comparison of geographic populations

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  
  1. † 0.10 <P < 0.05; ***P < 0.001; df, degrees of freedom; MS, mean square; F, variance ratio