Mechanism of barotaxis in marine zooplankton

• Verfasst von: Bezares Calderón, Luis Alberto [VerfasserIn]
• Verfasst von: Shahidi, Réza [VerfasserIn]
• Verfasst von: Jékely, Gáspár [VerfasserIn]
• Titel: Mechanism of barotaxis in marine zooplankton
• Verf.angabe: Luis Alberto Bezares Calderón, Réza Shahidi, Gáspár Jékely
• E-Jahr: 2024
• Jahr: 19 September 2024
• Umfang: 23 S.
• Fussnoten: Gesehen am 27.02.2025
• Titel Quelle: Enthalten in: eLife
• Ort Quelle: Cambridge : eLife Sciences Publications, 2012
• Jahr Quelle: 2024
• Band/Heft Quelle: 13(2024), Artikel-ID RP94306, Seite RP94306-1-RP94306-23
• ISSN Quelle: 2050-084X
• DOI: doi:10.7554/eLife.94306
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: barotaxis
• Sach-SW: ciliary photoreceptor
• Sach-SW: ciliated larva
• Sach-SW: connectome
• Sach-SW: serotonin
• Sach-SW: zooplankton
• K10plus-PPN: 1918744009

Abstract

Hydrostatic pressure is a dominant environmental cue for vertically migrating marine organisms but the physiological mechanisms of responding to pressure changes remain unclear. Here, we uncovered the cellular and circuit bases of a barokinetic response in the planktonic larva of the marine annelid Platynereis dumerilii. Increased pressure induced a rapid, graded, and adapting upward swimming response due to the faster beating of cilia in the head multiciliary band. By calcium imaging, we found that brain ciliary photoreceptors showed a graded response to pressure changes. The photoreceptors in animals mutant for ciliary opsin-1 had a smaller sensory compartment and mutant larvae showed diminished pressure responses. The ciliary photoreceptors synaptically connect to the head multiciliary band via serotonergic motoneurons. Genetic inhibition of the serotonergic cells blocked pressure-dependent increases in ciliary beating. We conclude that ciliary photoreceptors function as pressure sensors and activate ciliary beating through serotonergic signalling during barokinesis.