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First published online August 3, 2006
Journal of Experimental Biology 209, 3155-3163 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02318
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Age determination in individual wild-caught Drosophila serrata using pteridine concentration

Simon K. A. Robson1,*, Mathew Vickers1, Mark W. Blows2 and Ross H. Crozier1

1 School of Tropical Biology, James Cook University, Townsville QLD 4812, Australia
2 School of Integrative Biology, Queensland University, St Lucia 4067, Australia


Figure 1
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  		Fig. 1. Emission spectra for 6-biopterin standard and an extract from an individual Drosophila serrata.

 

Figure 2
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  		Fig. 2. The relationship between 6-biopterin concentration and emission intensity at 445 nm. The broken line indicates the minimum intensity recorded from an individual D. serrata. Pteridine concentrations can be detected down to emission levels of 0.01 arbitrary units (a.u.).

 

Figure 3
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  		Fig. 3. The increase in pteridine content (intensity averaged over all individuals of an age class, ± 2 s.e.m.; for N values, see Materials and methods) with known age in laboratory-reared D. serrata females (A) and males (B). Linear regressions though the average values for each sex displayed here indicated that pteridine content was closely associated with age in females (r2=0.917, F1,16=175.8, P<0.001) and males (r2=0.760, F1,15=47.6, P<0.001).

 

Figure 4
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  		Fig. 4. The effect of temperature and light intensity on pteridine content (intensity averaged over all individuals of each age class, ± 2 s.e.m., for N values, see Materials and methods). (A) Cabinet ambient light intensity. (B) 50% light intensity. (C) 25% light intensity. (D) 12.5% light intensity.

 

Figure 5
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  		Fig. 5. Estimated survivor functions for laboratory populations of female (bold line) and male (thin line) D. serrata.

 

Figure 6
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  		Fig. 6. Distribution of the predicted ages of field-caught D. serrata males.

 

Figure 7
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  		Fig. 7. Inverse regression 95% confidence limits (C.L.) for the predicted ages of field-caught D. serrata males (circles).

 

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© The Company of Biologists Ltd 2006