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Schlagwörter:
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Zusammenfassung:
Divergent populations across different environments are exposed to critical sensory information
related to locating a host or mate, as well as avoiding predators and pathogens. These
sensory signals generate evolutionary changes in neuroanatomy and behavior; however, few
studies have investigated patterns of neural architecture that occur between sensory systems,
or that occur within large groups of closely-related organisms. Here we examine
62 species within the genus Drosophila and describe an inverse resource allocation between
vision and olfaction, which we consistently observe at the periphery, within the brain, as well
as during larval development. This sensory variation was noted across the entire genus and
appears to represent repeated, independent evolutionary events, where one sensory modality
is consistently selected for at the expense of the other. Moreover, we provide evidence of a
developmental genetic constraint through the sharing of a single larval structure, the eyeantennal
imaginal disc. In addition, we examine the ecological implications of visual or
olfactory bias, including the potential impact on host-navigation and courtship.
