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The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:
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Temperature induces changes in Drosophila energy stores.

Peter Klepsatel1, David Wildridge2, Martina Gáliková3

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Area of Science:

  • Physiology
  • Environmental Science
  • Zoology

Background:

  • Ambient temperature significantly influences animal physiology and energy balance.
  • Understanding temperature effects on energy stores is crucial for predicting organismal responses to environmental changes.

Purpose of the Study:

  • To investigate the impact of varying ambient temperatures on the energy reserves (fat and glycogen) of Drosophila melanogaster.
  • To explore the relationship between temperature, food consumption, metabolic rate, and starvation resistance in fruit flies.

Main Methods:

  • Adult male Drosophila melanogaster were exposed to 11 different temperatures ranging from 13°C to 33°C.
  • Measurements included fat and glycogen stores, food consumption, metabolic rate, and starvation survival time.
  • Analysis focused on identifying temperature-dependent trends and correlations between physiological parameters.

Main Results:

  • Drosophila melanogaster showed increased fat stores at intermediate temperatures (around 15°C-27°C).
  • Exposure to temperatures below 15°C or above 27°C led to a reduction in fat reserves, with glycogen stores showing a similar trend.
  • Food intake and metabolic rate scaled similarly with temperature, suggesting energy reserve changes are not due to a mismatch in these factors.
  • Starvation survival decreased exponentially with increasing temperature, but relative resistance was not compromised at non-optimal temperatures.

Conclusions:

  • Optimal temperatures promote the accumulation of energy reserves in Drosophila melanogaster.
  • Non-optimal temperatures lead to a depletion of energy stores, potentially affecting survival under stress.
  • The findings highlight the critical role of temperature in regulating energy metabolism and resource allocation in insects.