Vertical distribution and diurnal migration of atlantid heteropods

• Published in: Marine Ecology Progress Series
• Main Authors: Wall-Palmer, Deborah, Metcalfe, Brett, Leng, Melanie, Sloane, Hillary, Ganssen, Gerald, Vinayachandran, P. N., Smart, Christopher
• Other Authors: School of Geography, Earth and Environmental Sciences Plymouth (SoGEES), Plymouth University, Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Cluster Earth and Climate Amsterdam, Department of Earth Sciences Amsterdam, Vrije Universiteit Amsterdam Amsterdam (VU)-Vrije Universiteit Amsterdam Amsterdam (VU), University of Nottingham, UK (UON), British Geological Survey Keyworth, British Geological Survey (BGS), Centre for Atmospheric and Oceanic Sciences Bangalore (CAOS), Indian Institute of Science Bangalore (IISc Bangalore), European Project: 746186,H2020-MSCA-IF-2016,POSEIDoN(2017)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2018
• Subjects: Atlantidae; Gastropod; Vertical distribution; Diurnal migration; Oxygen isotopes; Calcification; Ocean acidification; [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment
• Online Access: https://hal.science/hal-02976445; https://hal.science/hal-02976445/document; https://hal.science/hal-02976445/file/m587p001.pdf; https://doi.org/10.3354/meps12464

International audience Understanding the vertical distribution and migratory behaviour of shelled holoplanktonic gastropods is essential in determining the environmental conditions to which they are exposed. This is increasingly important in understanding the effects of ocean acidification and climate change. Here we investigated the vertical distribution of atlantid heteropods by collating data from publications and collections and using the oxygen isotope (δ$^{18}$O) composition of single aragonitic shells. Data from publications and collections show 2 patterns of migration behaviour: small species that reside in shallow water at all times, and larger species that make diurnal migrations from the surface at night to deep waters during the daytime.The δ$^{18}$O data show that all species analysed (n = 16) calcify their shells close to the deep chlorophyll maximum. This was within the upper 110 m of the ocean for 15 species, and down to 146 m for a single species. These findings confirm that many atlantid species are exposed to large environmental variations over a diurnal cycle and may already be well adapted to faceocean changes. However, all species analysed rely on aragonite supersaturated waters in the upper <150 m of the ocean to produce their shells, a region that is projected to undergo the earliest and greatest changes in response to increased anthropogenic CO$_2$