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Vertical Distribution and Diurnal Migration of Atlantid Heteropods Deborah Wall-Palmer, Brett Metcalfe, Melanie Leng, Hillary Sloane, Gerald Ganssen, P

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Vertical Distribution and Diurnal Migration of Atlantid Heteropods Deborah Wall-Palmer, Brett Metcalfe, Melanie Leng, Hillary Sloane, Gerald Ganssen, P Vertical distribution and diurnal migration of atlantid heteropods Deborah Wall-Palmer, Brett Metcalfe, Melanie Leng, Hillary Sloane, Gerald Ganssen, P. N. Vinayachandran, Christopher Smart To cite this version: Deborah Wall-Palmer, Brett Metcalfe, Melanie Leng, Hillary Sloane, Gerald Ganssen, et al.. Vertical distribution and diurnal migration of atlantid heteropods. Marine Ecology Progress Series, Inter Research, 2018, 587, pp.1-15. 10.3354/meps12464. hal-02976445 HAL Id: hal-02976445 https://hal.archives-ouvertes.fr/hal-02976445 Submitted on 7 May 2021 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Vol. 587: 1–15, 2018 MARINE ECOLOGY PROGRESS SERIES Published January 25 https://doi.org/10.3354/meps12464 Mar Ecol Prog Ser OPENPEN FEATURE ARTICLE ACCESSCCESS Vertical distribution and diurnal migration of atlantid heteropods Deborah Wall-Palmer1,7,*, Brett Metcalfe2,3, Melanie J. Leng4,5, Hilary J. Sloane5, Gerald Ganssen2, P. N. Vinayachandran6, Christopher W. Smart1 1School of Geography, Earth and Environmental Sciences, University of Plymouth, Plymouth PL4 8AA, UK 2Earth and Climate Cluster, Department of Earth Sciences, Faculty of Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands 3Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 91191 Gif-sur-Yvette, France 4School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, UK 5NERC Isotope Geosciences Facilities, British Geological Survey, Keyworth NG12 5GG, UK 6Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore 560 012, India 7Present address: Naturalis Biodiversity Center, 2300 RA Leiden, The Netherlands ABSTRACT: Understanding the vertical distribution and migratory behaviour of shelled holoplanktonic gastropods is essential in determining the environ- mental conditions to which they are exposed. This is increasingly important in understanding the effects of ocean acidification and climate change. Here we in- vestigated the vertical distribution of atlantid hetero - pods by collating data from publications and collec- tions and using the oxygen isotope (δ18O) 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 δ18O data show that all species analysed (n = 16) calcify their shells close to the deep chlorophyll maxi- mum. This was within the upper 110 m of the ocean for 15 species, and down to 146 m for a single species. Young adult atlantid heteropod Oxygyrus inflatus collected in the Atlantic Ocean during cruise AMT27. Maximum shell These findings confirm that many atlantid species are diameter (excluding keel) 1.6 mm. exposed to large environmental variations over a diur- nal cycle and may already be well adapted to face Photo: © K. Peijnenburg, E. Goetze, D. Wall-Palmer, L. Mekkes ocean changes. However, all species analysed rely on aragonite supersaturated waters in the upper <150 m INTRODUCTION of the ocean to produce their shells, a region that is projected to undergo the earliest and greatest changes Holoplanktonic gastropods spend their entire lives in response to increased anthropogenic CO2. as drifting plankton, unable to swim against currents, KEY WORDS: Atlantidae · Gastropod · Vertical but capable of adjusting their vertical position in the distribution · Diurnal migration · Oxygen isotopes · water column (Lalli & Gilmer 1989). This allows them Calcification · Ocean acidification to sink to depths, rise back to the surface or remain at a preferential depth. However, it is still unclear to what *Corresponding author: [email protected] © Inter-Research 2018 · www.int-res.com 2 Mar Ecol Prog Ser 587: 1–15, 2018 degree holoplanktonic gastropods take advantage of lower depths (Lalli & Gilmer 1989, Seapy 1990, this vertical freedom, for example, to avoid predation, Michel & Michel 1991, Paulinose et al. 1992, Jivaluk to reduce competition on finite food resources or to 1998, Ossenbrügger 2010, Lemus-Santana et al. 2014, seek preferential environmental conditions. Wall-Palmer et al. 2016c). However, many atlantids Two groups of holoplanktonic gastropods are rec- are thought not to be static in their vertical position in ognized: the pteropods (Thecosomata and Gymnoso- the water column, but to undergo some degree of mata) and the heteropods (Pterotracheoidea). Both daily vertical migration. Studies based on sampling groups contain shelled, partially shelled and shell- with plankton nets at different depths suggest that the less species, although even shell-less species have a depth and timing of this vertical migration are not shell in the larval stage, which is subsequently dis- only species specific, but also are specific to the onto- carded (Lalli & Gilmer 1989). Holoplanktonic gastro- genetic stage and are probably influenced by seasonal pod shells are composed of aragonite, a form of cal- changes (Wall-Palmer et al. 2016c and references cium carbonate that is susceptible to dissolution in therein). To date, the most extensive and thorough waters undersaturated with respect to aragonite study of atlantid vertical distributions and migratory (Mucci 1983). These sensitive shells have highlighted behaviour was conducted by Seapy (1990) offshore of the euthecosome (fully shelled) pteropods as being Hawaii (USA). Seapy (1990) demonstrated 2 patterns amongst the most vulnerable organisms to ocean of distribution: (1) small species that remained in shal- acidification, with effects already being detected in low water of <140 m depth at all times, being active in field populations (Bednaršek & Ohman 2015). Ocean the daytime and generally inactive at night, and (2) acidification research has not yet included the het- larger species that are inactive at depth during the eropods, which also rely on aragonite shells and in- daytime, but migrate to the surface at night to feed. habit the upper ocean, a realm of highly variable en- The shell geochemistry of some holoplanktonic gas- vironmental parameters. This region will be greatly tropods has been used successfully to identify the affected by ocean acidification and climate change, so depth at which shells are grown (e.g. Grossman et al. it is beneficial to understand the vertical distribution 1986, Juranek et al. 2003, Keul et al. 2017). The ratio of holoplanktonic gastropods. This will help scientists of the oxygen isotopes 18O and 16O (δ18O) incorporated to determine the environmental conditions to which into an aragonite shell is a function of the δ18O of the 18 they are frequently exposed and may demonstrate, water in which a specimen lives (δ Ow) and tempera- 18 for example, that holoplanktonic gastropods are al- ture (Grossman & Ku 1986). The δ Ow is a conserva- ready exposed on a daily basis to undersaturated wa- tive water mass tracer related to input (e.g. precipita- ters, with respect to aragonite, or to temperatures tion and meltwater) and output (e.g. evaporation, more variable than those predicted to affect oceans sea-ice and brine formation), and therefore is directly over the next 100 yr. Ultimately, holoplanktonic gas- relatable to seawater salinity (LeGrande & Schmidt tropods may already have mechanisms for dealing 2006). Temperature plays a dominant role in the frac- with a changing ocean (e.g. Maas et al. 2012). Con- tionation between 18O and 16O during the formation of 18 18 versely, ocean changes may present even more aragonite. Therefore, the δ O equilibrium (δ Oeq) at severe vertical environmental gradients than pre- which aragonite is precipitated in seawater can be dicted, which holoplanktonic gastropods may be un- calculated from salinity and temperature. Eutheco- able to adapt to, potentially forcing them to modify some pteropods and atlantid heteropods calcify at or and constrain their vertical movements. close to the aragonite−water isotopic equilibrium; This study focusses on the shelled heteropods, or therefore, the δ18O of their shells directly records the 18 atlantids (family Atlantidae), which rely on a shell δ Oeq of the water in which they live (Grossman et al. throughout their life. Atlantids are small (<14 mm) 1986, Juranek et al. 2003, Keul et al. 2017). Depth of predatory holoplanktonic gastropods that feed on other calcification can be inferred by comparing the δ18O of 18 metazooplankton, including euthecosome pteropods the specimen to a δ Oeq depth profile of the ambient (Lalli & Gilmer 1989). Atlantids are able to fully retract water in which the specimen lived (calculated using into their thin-walled (1.5−8 µm, D. Wall-Palmer pers. temperature and salinity, LeGrande & Schmidt 2006). obs.) aragonite shells, which are generally a broad, This technique has been used in a single study on flat disk shape that is necessary for efficient swim- atlantids (Grossman et al. 1986). Grossman et al. (1986) ming. The vertical
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