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Sensory adaptations in shrimp from deep hydrothermal vents : Comparison of chemo‐ and thermo-sensory abilities in the vent species Mirocaris fortunata and the coastal species Palaemon elegans

Abstract : Alvinocaridid shrimp are an emblematic taxon at hydrothermal vents on the Mid-Atlantic Ridge, but how they locate active vents and detect their habitat is still enigmatic. They might use the chemical and thermal signatures of the hydrothermal fluid as orientation cues. The chemo- and thermosensory abilities of the hydrothermal species Mirocaris fortunata and the coastal species Palaemon elegans were investigated using various approaches. Structural features of the peripheral and central nervous system were used as rough estimates of their olfactory abilities. The co-ionotropic receptor IR25a, involved in chemodetection, was identified and located in the antennal appendages. A new electroantennography method was developed to test the detection of hydrothermal fluid chemicals. Several attraction tests were conducted at atmospheric and in situ pressure to investigate the behavior of the vent and shallow-water species when exposed to a food odor, sulfide and warm temperatures. Altogether, these results provide advances in the knowledge of the chemosensory biology of vent shrimp, and a substantial background for future researches on sensory adaptations to the hydrothermal environment.
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Julia Machon. Sensory adaptations in shrimp from deep hydrothermal vents : Comparison of chemo‐ and thermo-sensory abilities in the vent species Mirocaris fortunata and the coastal species Palaemon elegans. Animal biology. Sorbonne Université, 2018. English. ⟨NNT : 2018SORUS145⟩. ⟨tel-02337110⟩

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