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Growth and developmental stability of Drosophila melanogaster in low frequency magnetic fields
J H Graham1, D Fletcher, J Tigue
1Department of Biology, Berry College, Mount Berry, Georgia 30149, USA. jgraham@berry.edu
Abstract:
Magnetic fields (60 Hz) of 1.5 and 80 microT caused a significant reduction in the weight of Drosophila melanogaster. Moreover, fruit flies in an 80 microT field showed lower developmental stability than either those in a 0 or 1.5 microT field. Developmental instability was measured by fluctuating asymmetry and frequency of phenodeviants. More of the flies in the 80 microT field had fused abdominal segments, and they were more asymmetrical for wing vein R(4+5). The flies in the 1.5 microT field actually showed greater developmental stability than the control flies. Fewer of them had fused abdominal segments, and they were more symmetrical for wing vein R(4+5). Thus, at low field strengths, flies are more developmentally stable than control flies, even though they weigh less.
Insights
Exposure to 60 Hz magnetic fields impacts fruit fly development. While higher magnetic field strengths (80 microT) reduce developmental stability in Drosophila melanogaster, lower strengths (1.5 microT) enhance it.
Area of Science:
- Environmental Science
- Developmental Biology
- Biophysics
Background:
- Electromagnetic fields (EMFs) are ubiquitous environmental factors.
- Understanding the biological effects of EMFs is crucial for public health.
- Drosophila melanogaster serves as a model organism for studying developmental responses.
Purpose of the Study:
- To investigate the effects of 60 Hz magnetic fields on the weight and developmental stability of Drosophila melanogaster.
- To determine if magnetic field strength influences developmental instability.
- To assess specific developmental traits affected by magnetic field exposure.
Main Methods:
- Fruit flies (Drosophila melanogaster) were exposed to 60 Hz magnetic fields at 0, 1.5, and 80 microTesla (μT).
- Body weight was measured to assess overall growth effects.
- Developmental stability was evaluated using fluctuating asymmetry and the frequency of phenodeviants (e.g., fused abdominal segments).
- Wing vein asymmetry (R4+5) was quantified.
Main Results:
- Magnetic fields of 1.5 μT and 80 μT significantly reduced fruit fly weight compared to controls.
- Exposure to 80 μT resulted in lower developmental stability, evidenced by increased fluctuating asymmetry and phenodeviants.
- Conversely, 1.5 μT exposure led to greater developmental stability, with fewer fused abdominal segments and more symmetrical wing veins than controls.
Conclusions:
- Magnetic field strength is a critical factor in determining developmental responses in Drosophila melanogaster.
- Low-strength magnetic fields (1.5 μT) can enhance developmental stability despite reducing body weight.
- High-strength magnetic fields (80 μT) induce developmental instability, suggesting a dose-dependent effect.