Thermal Effects on Immunity and Fecundity in Drosophila melanogaster
Author Information
Author(s): Lazzaro Brian P., Flores Heather A., Lorigan James G., Yourth Christopher P.
Primary Institution: Cornell University
Hypothesis
Are Drosophila melanogaster subpopulations immunologically adapted to local thermal conditions and do genotype-by-environment interactions influence immune performance?
Conclusion
Drosophila melanogaster subpopulations exhibit adaptation to local thermal conditions, affecting their immunity and fecundity.
Supporting Evidence
- Environmental temperature had absolute effects on immunity and fecundity traits.
- African flies performed poorly at low temperatures compared to North American flies.
- Genotype-by-environment interactions were significant for both immunity and fecundity.
- There was no evidence of a fitness tradeoff between immunity and fecundity.
- Congolese flies had higher bacterial loads at lower temperatures compared to North American flies.
Takeaway
This study shows that fruit flies from different places react differently to temperature changes, which affects how well they fight infections and how many babies they can have.
Methodology
Flies were tested for resistance to bacterial infection and fecundity at three different temperatures using a within-population chain cross design.
Potential Biases
Potential underestimation of bacterial loads due to the method of measuring bacterial load from surviving flies only.
Limitations
The study was conducted using a single genotype of one pathogen, which may not represent the complexity of natural infections.
Participant Demographics
Drosophila melanogaster isofemale lines from Congo, Georgia, and New York.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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