Model and Non-model Insects in Chronobiology

Area of Science:

• Chronobiology
• Insect neurobiology
• Behavioral ecology

Background:

• Drosophila melanogaster and Apis mellifera are established chronobiology models due to ease of study and well-characterized behaviors.
• Their circadian clock neuroanatomy and behaviors like foraging, navigation, and learning are extensively studied.
• However, these models have limitations in investigating photoperiodism and diapause, crucial for understanding insect adaptation.

Purpose of the Study:

• To review the advantages and limitations of Drosophila melanogaster and Apis mellifera as general models for insect circadian clocks.
• To highlight the necessity of studying non-model insects for a comprehensive understanding of circadian clock functions.
• To compare established models with other insect species relevant to chronobiology research.

Main Methods:

• Comparative review of existing literature on insect circadian clocks.
• Analysis of model organism strengths and weaknesses in relation to specific biological phenomena (e.g., diapause, photoperiodism).
• Discussion of the evolutionary aspects of sociality and circadian clocks in different insect orders.

Main Results:

• Drosophila melanogaster and Apis mellifera offer valuable insights but do not exhibit photoperiodic diapause or true diapause, respectively.
• High-latitude flies and solitary bees present different diapause strategies.
• Sociality and its clock regulation evolved independently in Hymenoptera, suggesting limitations in using a single social insect model.

Conclusions:

• Established models like Drosophila and honey bees are insufficient for fully understanding insect circadian clock mechanisms, especially photoperiodism and diapause.
• Research on non-model insects is crucial for a holistic understanding of circadian clocks in Diptera and Hymenoptera.
• A broader range of insect species is needed to elucidate the diversity and evolution of circadian clock functions across insects.