title: Astronomical and atmospheric impacts on deep-sea hydrothermal vent invertebrates.
abstract: Ocean tides and winter surface storms are among the main factors driving the dynamics and spatial structure of marine coastal species, but the understanding of their impact on deep-sea and hydrothermal vent communities is still limited. Multidisciplinary deep-sea observatories offer an essential tool to study behavioural rhythms and interactions between hydrothermal community dynamics and environmental fluctuations. Here, we investigated whether species associated with aRidgeia piscesaetubeworm vent assemblage respond to local ocean dynamics. By tracking variations in vent macrofaunal abundance at different temporal scales, we provide the first evidence that tides and winter surface storms influence the distribution patterns of mobile and non-symbiotic hydrothermal species (i.e. pycnogonidsSericosurasp. and Polynoidae polychaetes) at more than 2 km depth. Local ocean dynamics affected the mixing between hydrothermal fluid inputs and surrounding seawater, modifying the environmental conditions in vent habitats. We suggest that hydrothermal species respond to these habitat modifications by adjusting their behaviour to ensure optimal living conditions. This behaviour may reflect a specific adaptation of vent species to their highly variable habitat.
authors.affiliation: Ifremer Centre de Bretagne, REM/EEP, Laboratoire Environnement Profond, 29280 Plouzané, France yann.lelievre@ifremer.fr.|Département de sciences biologiques, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec, Canada H3C 3J7.
authors.forename: Yann
authors.identifier: http://orcid.org/0000-0003-3508-418X
authors.initials: Y
authors.lastname: Lelièvre
authors.affiliation: Département de sciences biologiques, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec, Canada H3C 3J7.
authors.forename: Pierre
authors.initials: P
authors.lastname: Legendre
authors.affiliation: Ifremer Centre de Bretagne, REM/EEP, Laboratoire Environnement Profond, 29280 Plouzané, France.
authors.forename: Marjolaine
authors.initials: M
authors.lastname: Matabos
authors.affiliation: Ocean Networks Canada, University of Victoria, PO Box 1700 STN CSC, Victoria, British Columbia, Canada V8 W 2Y2.
authors.forename: Steve
authors.initials: S
authors.lastname: Mihály
authors.affiliation: School of Biological Sciences, Washington State University, Pullman, WA 99164, USA.
authors.forename: Raymond W
authors.initials: RW
authors.lastname: Lee
authors.affiliation: Ifremer Centre de Bretagne, REM/EEP, Laboratoire Environnement Profond, 29280 Plouzané, France.
authors.forename: Pierre-Marie
authors.initials: PM
authors.lastname: Sarradin
authors.affiliation: Biodiversity Program, Queensland Museum, PO BOX 3300, South Brisbane, Queensland 4101, Australia.
authors.forename: Claudia P
authors.initials: CP
authors.lastname: Arango
authors.affiliation: Ifremer Centre de Bretagne, REM/EEP, Laboratoire Environnement Profond, 29280 Plouzané, France.
authors.forename: Jozée
authors.initials: J
authors.lastname: Sarrazin
mesh_terms: D000818:Animals; D001272:Atmosphere; D017753:Ecosystem; D060086:Hydrothermal Vents; D007448:Invertebrates; D012623:Seawater; D055871:Tidal Waves
keywords: deep-sea observatory; hydrothermal vents; macrofaunal abundance; ocean tides; surface storms; time-series analysis