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- W4387244025 abstract "Abstract Animals are adapted to their natural habitats and lifestyles. Their brains perceive the external world via their sensory systems, compute information and generate appropriate behavioral outputs. However, how do these processes evolve across evolution? Here, focusing on the sense of olfaction, we have studied the evolution in olfactory sensitivity, preferences and behavioral responses to six different amino acid odors in the two morphs of the fish Astyanax mexicanus . To this end, we have developed a high-throughput behavioral setup and pipeline of quantitative and qualitative behavior analysis, and we have tested 425 six-week-old Astyanax larvae. The blind, dark-adapted morphs of the species showed markedly distinct basal swimming patterns and behavioral responses to odors, higher olfactory sensitivity and a strong preference for alanine, as compared to their river-dwelling eyed conspecifics. In addition, we discovered that fish have an individual “swimming personality”, and that this personality influences their capability to respond efficiently to odors and find the source. Importantly, the personality traits that favored significant responses to odors were different in surface fish and cavefish. Moreover, the responses displayed by second-generation cave x surface F2 hybrids suggested that olfactory-driven behavior is a quantitative genetic trait. Our findings show that olfactory processing has rapidly evolved in cavefish at several levels: detection threshold, odor preference, and foraging behavior strategy. Cavefish is therefore an outstanding model to understand the genetic, molecular and neurophysiological basis of sensory specialization in response to environmental change." @default.
- W4387244025 created "2023-10-03" @default.
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- W4387244025 date "2023-10-02" @default.
- W4387244025 modified "2023-10-10" @default.
- W4387244025 title "Evolution of olfactory sensitivity, preferences and behavioral responses in Mexican cavefish: fish personality matters" @default.
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- W4387244025 doi "https://doi.org/10.1101/2023.10.02.560458" @default.
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