DOCSLIB.ORG

From Wood to Vent: First Cocculinid Limpet Associated with Hydrothermal Activity Discovered in the Weddell

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
From Wood to Vent: First Cocculinid Limpet Associated with Hydrothermal Activity Discovered in the Weddell See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/340844206 From wood to vent: first cocculinid limpet associated with hydrothermal activity discovered in the Weddell Sea Article in Antarctic Science · April 2020 DOI: 10.1017/S095410202000022X CITATION READS 1 425 2 authors: Chong Chen Katrin Linse Japan Agency for Marine-Earth Science Technology British Antarctic Survey 111 PUBLICATIONS 833 CITATIONS 150 PUBLICATIONS 4,526 CITATIONS SEE PROFILE SEE PROFILE Some of the authors of this publication are also working on these related projects: Deep-sea hydrothermal vents View project State of the Antarctic Ecosystem (AntEco) View project All content following this page was uploaded by Chong Chen on 22 April 2020. The user has requested enhancement of the downloaded file. Antarctic Science page 1 of 13 (2020) © Antarctic Science Ltd 2020 doi:10.1017/S095410202000022X From wood to vent: first cocculinid limpet associated with hydrothermal activity discovered in the Weddell Sea CHONG CHEN 1 and KATRIN LINSE 2 1X-STAR, Japan Agency for Marine-Earth Science and Technology (JAMSTEC),2–15 Natsushima-cho, Yokosuka, Kanagawa Prefecture 237-0061, Japan 2British Antarctic Survey, High Cross, Cambridge CB3 0ET, UK [email protected] This article is registered in ZooBank under: urn:lsid:zoobank.org:pub:296FAB17-E989-4921-9E2D-2F8518B2D05F Cocculina enigmadonta n. sp. is registered in ZooBank under: urn:lsid:zoobank.org:act:0F15867C-6B73-40E3-B0C9-762F8CFE5730 Abstract: Lush 'oases' of life seen in chemosynthetic ecosystems such as hot vents and cold seeps represent rare, localized exceptions to the generally oligotrophic deep ocean floor. Organic falls, best known from sunken wood and whale carcasses, are additional sources of such oases. Kemp Caldera (59°42'S, 28°20'W) in the Weddell Sea exhibits active hydrothermal vents and a natural whale fall in close proximity, where an undescribed cocculinid limpet was found living in both types of chemosynthetic habitats. This represents the first member of the gastropod order Cocculinida discovered from hot vents, and also the first record from the Southern Ocean. Here, we applied an integrative taxonomy framework incorporating traditional dissection, electron microscopy, genetic sequencing and 3D anatomical reconstruction through synchrotron computed tomography in order to characterize this species. Together, our data revealed an unusual member of the genus Cocculina with a highly modified radula for feeding on bacterial film, described herein as Cocculina enigmadonta n. sp. Its phylogenetically derived position within the largely wood-inhabiting Cocculina indicates that it probably evolved from an ancestor adapted to living on sunken wood, providing a compelling case of the 'stepping stone' evolutionary trajectory from organic falls to seeps and vents. Received 8 October 2019, accepted 7 March 2020 Key words: Cocculina, Cocculinidae, Cocculiniformia, mollusc, new species, South Sandwich Arc Introduction Among the limpets, pectinodontids in the genus Pectinodonta typically have gut contents predominantly Deprived of sunlight and photosynthetic primary composed of microscopic pieces of wood, while the gut production, the deep ocean floor is generally oligotrophic contents of cocculinids also include large amounts of with the exception of chemosynthesis-based ecosystems detritus and sediment, meaning that they probably feed driven by the Earth's own geochemistry, such as hot by grazing on the surface bacterial film (Marshall 1985). vents and cold seeps (Van Dover 2000). Microbial As organic falls decay, hydrogen sulphide is produced as chemosynthesis involves deriving energy from reducing a by-product, leading to a chemosynthetic ecosystem not compounds such as hydrogen sulphide, and it allows unlike vents or seeps (Smith & Baco 2003). As such, vents and seeps to host very high levels of animal organic falls have been hypothesized as evolutionary biomass comparable to those of coral reefs, with most 'stepping stones' towards endemism in vents and seeps species becoming specially adapted to these ecosystems (Smith et al. 2015), but with the exception of deep-sea and unable to live anywhere else (Van Dover 2000). bathymodioline mussels (Thubaut et al. 2013), little In addition, organic debris sinking from the sea surface evidence has been presented to show how such also generates localized, ephemeral 'oases' of nutrient transitions might have occurred. enrichment in the deep (Smith & Baco 2003). Primarily Recently,hydrothermal vents (Roterman et al. 2016) and comprising sunken wood and large mammal carcasses a natural whale fall (Amon et al. 2013) were discovered in typified by whales and collectively known as organic close proximity within Kemp Caldera (59°42'S, 28°20'W) falls, these habitats attract and are sources of food for in the Southern Ocean, < 100 km away from deeper numerous animals, including many typical foundation vents on segment E9 of the East Scotia Ridge (Rogers species such as the bone-eating zombie worm Osedax et al. 2012). Located just west of Kemp Seamount on the (Smith et al. 2015), the wood-boring bivalve Xylophaga volcanic South Sandwich Arc (Leat et al. 2016), Kemp and wood-ingesting limpets of the families Caldera is 900–1600 m in depth from sill to base with Pectinodontidae and Cocculinidae (Marshall 1985). white-smoker and diffuse-flow vents mainly concentrated 1 2 CHONG CHEN AND KATRIN LINSE Cocculinidae is a family of hermaphroditic, roughly symmetrical gastropods with limpet-like shells, currently placed in the superfamily Cocculinoidea (subclass Neomphaliones, order Cocculinida) (Bouchet et al. 2017). Previously known only from organic falls, primarily sunken woods (Marshall 1985, McLean & Harasewych 1995, Ardila & Harasewych 2005), 7 genera and over 40 species are currently recognized within the family (Zhang & Zhang 2018). Despite its near-global distribution, no records have been reported from the Southern Ocean. Cocculina, the nominal genus of Cocculinidae with over 20 species, is one of the most abundant invertebrates commonly associated with sunken wood, although two species have been described from cetacean carcasses, including Cocculina craigsmithi McLean 1992 from off California and Cocculina delphinicula Zhang & Zhang, 2018 from the East China Sea (McLean 1992, Zhang & Zhang 2018). Cocculinoidea was originally considered to form a monophyletic clade with Lepetelloidea, another superfamily of morphologically and ecologically similar limpets (Haszprunar 1987, 1988), but these superfamilies are now considered to be two separate, convergent radiations (Aktipis & Giribet 2012). Cocculinoids are more closely affiliated with neomphaloids, which are also restricted to chemosynthetic habitats but mainly radiated in hot vents (Warén & Bouchet 2001), while lepetelloids are placed within the subclass Vetigastropoda (Cunha & Giribet 2019). Fig. 1. Map of a. South Sandwich Arc showing the The Kemp Caldera cocculinid is the first member of the location of Kemp Caldera and b. the distribution of order Cocculinida from hydrothermal vent environments Cocculina enigmadonta n. sp. within Kemp Caldera (black and poses an opportunity to investigate a potential stars, hydrothermal vents; white star, natural whale fall). transition from organic falls to hot vents. It is also the first cocculinid from the Southern Ocean, although its locality around a central resurgent cone (Fig. 1). Although a subset is barely within the limit of the Southern Ocean (60°S), of taxa known from the East Scotia Ridge vents was present which is still debated. Here, we characterize the new at Kemp Caldera vents, some were absent (e.g. Kiwa yeti species morphologically and genetically, provide its formal crabs). In contrast, Kemp Caldera hosts large assemblages description and investigate its evolutionary history and of chemosymbiotic vesicomyid clams that are absent from adaptations to the hydrothermal vent environment. the East Scotia Ridge vents. Perhaps the most astonishing taxon presently known only from Kemp Caldera was an undescribed cocculinid limpet found in great abundance Materials and methods (Fig. 2) that represented a molluscan order that was Research cruises previously unknown from hot vents. The whale fall was also found near the resurgent cone in During expedition JC42 of RRS James Cook in 2010, Kemp Caldera, ∼250 m from the nearest hydrothermally cocculinid limpets were sampled using the suction active area (Amon et al. 2013). Of the species found on sampler or manipulator of the remotely operated vehicle the whale bones, which included typical whale fall taxa (ROV) Isis within Kemp Caldera on the volcanic South such as polychaete worms in the genera Osedax and Sandwich Arc from hydrothermal vents as well as from a Ophryotrocha (Amon et al. 2013), only two species were natural whale fall (Fig. 1) (Amon et al. 2013). In shared with the nearby vents: the vetigastropod limpet diffuse-flow areas of the hot vents, limpets were collected Lepetodrilus concentricus Linse, Roterman & Chen, from substrates including sulphide chimneys, sulphide 2019, known from both East Scotia Ridge and Kemp rubble, vesicomyid clam shells or whale bones (Fig. 2). Caldera vents (Linse et al. 2019), and an undescribed Upon recovery, specimens were preserved in pre-cooled cocculinid limpet (Amon et al. 2013). 96% ethanol. In 2019, expedition PS119 of RV HOT VENT COCCULINID LIMPET 3 Fig. 2. In situ photographs of Cocculina enigmadonta n. sp. in Kemp Caldera living on
Load more

Recommended publications
  • (Gastropoda: Cocculiniformia) from Off the Caribbean Coast of Colombia
    ó^S PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON ll8(2):344-366. 2005. Cocculinid and pseudococculinid limpets (Gastropoda: Cocculiniformia) from off the Caribbean coast of Colombia Néstor E. Ardila and M. G. Harasewych (NEA) Museo de Historia Natural Marina de Colombia, Instituto de Investigaciones Marinas, INVEMAR, Santa Marta, A.A. 1016, Colombia, e-mail: [email protected]; (MGH) Department of Invertebrate Zoology, MRC-I63, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20013-7012 U.S.A., e-mail: [email protected] Abstract.•The present paper reports on the occurrence of six species of Cocculinidae and three species of Pseudococculinidae off the Caribbean coast of Colombia. Cocculina messingi McLean & Harasewych, 1995, Cocculina emsoni McLean & Harasewych, 1995 Notocrater houbricki McLean & Hara- sewych, 1995 and Notocrater youngi McLean & Harasewych, 1995 were not previously known to occur within the of the Caribbean Sea, while Fedikovella beanii (Dall, 1882) had been reported only from the western margins of the Atlantic Ocean, including the lesser Antilles. New data are presented on the external anatomy and radular morphology of Coccocrater portoricensis (Dall & Simpson, 1901) that supports its placement in the genus Coccocrater. Coc- culina fenestrata n. sp. (Cocculinidae) and Copulabyssia Colombia n. sp. (Pseu- dococculinidae) are described from the upper continental slope of Caribbean Colombia. Cocculiniform limpets comprise two paraphyletic, with the Cocculinoidea related groups of bathyal to hadal gastropods with to Neomphalina and the Lepetelloidea in- global distribution that live primarily on cluded within Vetigastropoda (Ponder & biogenic substrates (e.g., wood, algal hold- Lindberg 1996, 1997; McArthur & Hara- fasts, whale bone, cephalopod beaks, crab sewych 2003).
    [Show full text]
  • Contributions in Science
    NUMBER 453 9 JUNE 1995 CONTRIBUTIONS IN SCIENCE REVIEW OF WESTERN ATLANTIC SPECIES OF COCCULINID AND PSEUDOCOCCULINID LIMPETS, WITH DESCRIPTIONS OF NEW SPECIES (GASTROPODA: COCCULINIFORMIA) JAMES H. MCLEAN AND M. G. HARASEWYCH NATURAL HISTORY MUSEUM OF LOS ANGELES GOUNTY Thf: scientific publications of the Natural History Mu- SERIAL seum of Los Angeles County have been issued at irregular intervals in three major series; the issues in each series are PUBLICATIONS numbered individually, and numbers run consecutively, OF THE regardless of the subject matter. • Contributions in Science, a miscellaneous series of tech- NATURAL HISTORY nical papers describing original research in the life and earth sciences. MUSEUM OF • Science Bulletin, a miscellaneous series of monographs describing original research in the hfe and earth sci- LOS ANGELES ences. This series was discontinued in 1978 with the issue of Numbers 29 and 30; monographs are now COUNTY published by the Museum in Contributions in Science. • Science Series, long anieles and collections of papers on natural history topics. Copies of the publications in these series are sold through the Museum Book Shop. A catalog is available on request. The Museum also publishes Technical Reports, a mis- cellaneous series containing information relative to schol- arly inquiry and collections but not reporting the results of original research. Issue is authorized by the Museum's Scientific Publications Committee; however, manuscripts do not receive anonymous peer review. Individual Tech- nical Reports may be obtained from the relevant Section of the Museum. SCIENTIFIC PUBLICATIONS COMMITTEE «ÎWA James L. Powell, Museum President NATURAL HISTORY MUSEUM Daniel M. Cohen, Committee OF Los ANGELES COUNTY Chairman 900 EXPOSITION BOULEVARD Brian V.
    [Show full text]
  • Mollusks and a Crustacean from Early Oligocene Methane-Seep Deposits in the Talara Basin, Northern Peru
    Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru STEFFEN KIEL, FRIDA HYBERTSEN, MATÚŠ HYŽNÝ, and ADIËL A. KLOMPMAKER Kiel, S., Hybertsen, F., Hyžný, M., and Klompmaker, A.A. 2020. Mollusks and a crustacean from early Oligocene methane- seep deposits in the Talara Basin, northern Peru. Acta Palaeontologica Polonica 65 (1): 109–138. A total of 25 species of mollusks and crustaceans are reported from Oligocene seep deposits in the Talara Basin in north- ern Peru. Among these, 12 are identified to the species-level, including one new genus, six new species, and three new combinations. Pseudophopsis is introduced for medium-sized, elongate-oval kalenterid bivalves with a strong hinge plate and largely reduced hinge teeth, rough surface sculpture and lacking a pallial sinus. The new species include two bivalves, three gastropods, and one decapod crustacean: the protobranch bivalve Neilo altamirano and the vesicomyid bivalve Pleurophopsis talarensis; among the gastropods, the pyropeltid Pyropelta seca, the provannid Provanna pelada, and the hokkaidoconchid Ascheria salina; the new crustacean is the callianassid Eucalliax capsulasetaea. New combina- tions include the bivalves Conchocele tessaria, Lucinoma zapotalensis, and Pseudophopsis peruviana. Two species are shared with late Eocene to Oligocene seep faunas in Washington state, USA: Provanna antiqua and Colus sekiuensis; the Talara Basin fauna shares only genera, but no species with Oligocene seep fauna in other regions. Further noteworthy aspects of the molluscan fauna include the remarkable diversity of four limpet species, the oldest record of the cocculinid Coccopigya, and the youngest record of the largely seep-restricted genus Ascheria.
    [Show full text]
  • THE LISTING of PHILIPPINE MARINE MOLLUSKS Guido T
    August 2017 Guido T. Poppe A LISTING OF PHILIPPINE MARINE MOLLUSKS - V1.00 THE LISTING OF PHILIPPINE MARINE MOLLUSKS Guido T. Poppe INTRODUCTION The publication of Philippine Marine Mollusks, Volumes 1 to 4 has been a revelation to the conchological community. Apart from being the delight of collectors, the PMM started a new way of layout and publishing - followed today by many authors. Internet technology has allowed more than 50 experts worldwide to work on the collection that forms the base of the 4 PMM books. This expertise, together with modern means of identification has allowed a quality in determinations which is unique in books covering a geographical area. Our Volume 1 was published only 9 years ago: in 2008. Since that time “a lot” has changed. Finally, after almost two decades, the digital world has been embraced by the scientific community, and a new generation of young scientists appeared, well acquainted with text processors, internet communication and digital photographic skills. Museums all over the planet start putting the holotypes online – a still ongoing process – which saves taxonomists from huge confusion and “guessing” about how animals look like. Initiatives as Biodiversity Heritage Library made accessible huge libraries to many thousands of biologists who, without that, were not able to publish properly. The process of all these technological revolutions is ongoing and improves taxonomy and nomenclature in a way which is unprecedented. All this caused an acceleration in the nomenclatural field: both in quantity and in quality of expertise and fieldwork. The above changes are not without huge problematics. Many studies are carried out on the wide diversity of these problems and even books are written on the subject.
    [Show full text]
  • A Molecular Phylogeny of the Patellogastropoda (Mollusca: Gastropoda)
    ^03 Marine Biology (2000) 137: 183-194 ® Spnnger-Verlag 2000 M. G. Harasevvych A. G. McArthur A molecular phylogeny of the Patellogastropoda (Mollusca: Gastropoda) Received: 5 February 1999 /Accepted: 16 May 2000 Abstract Phylogenetic analyses of partiaJ J8S rDNA formia" than between the Patellogastropoda and sequences from species representing all living families of Orthogastropoda. Partial 18S sequences support the the order Patellogastropoda, most other major gastro- inclusion of the family Neolepetopsidae within the su- pod groups (Cocculiniformia, Neritopsma, Vetigastro- perfamily Acmaeoidea, and refute its previously hy- poda, Caenogastropoda, Heterobranchia, but not pothesized position as sister group to the remaining Neomphalina), and two additional classes of the phylum living Patellogastropoda. This region of the Í8S rDNA Mollusca (Cephalopoda, Polyplacophora) confirm that gene diverges at widely differing rates, spanning an order Patellogastropoda comprises a robust clade with high of magnitude among patellogastropod lineages, and statistical support. The sequences are characterized by therefore does not provide meaningful resolution of the the presence of several insertions and deletions that are relationships among higher taxa of patellogastropods. unique to, and ubiquitous among, patellogastropods. Data from one or more genes that evolve more uni- However, this portion of the 18S gene is insufficiently formly and more rapidly than the ISSrDNA gene informative to provide robust support for the mono- (possibly one or more
    [Show full text]
  • The Appropriation Bill 2003
    SOUTH GEORGIA AND SOUTH SANDWICH ISLANDS GAZETTE PUBLISHED BY AUTHORITY No. 2 13 June 2013 The following are published in this Gazette – Notices 1 to 10; Supplementary Appropriation (2012) Ordinance 2013 (No 2 of 2013); Appropriation (2013) Ordinance 2013 (No 3 of 2013); Wildlife and Protected Areas (Amendment) Ordinance 2013 (No 4 of 2013); Postal Services (Amendment) Ordinance 2013 (No 5 of 2013); Marine Protected Areas Order 2013 (SR&O No 1 of 2013); Prohibited Areas Order 2013 (SR&O No 2 of 2013); and Coins Order 2013 (SR&O No 3 of 2013). 1 NOTICES terminated sooner. Dated 11 February 2013 No. 1 14 December 2012 N. R. HAYWOOD C.V.O., Commissioner. United Kingdom Statutory Instruments ____________________ Notice is hereby given that the following United Kingdom No. 3 6 May 2013 Statutory Instruments have been published in the United Kingdom by The Stationery Office Limited and are Police Ordinance 1967 available to view at www.legislation.gov.uk: section 5 Enrolment of Police Officer 2012 No 2748 – The Iraq (United Nations Sanctions) 1. The Police Ordinance 1967 (No 9 of 1967, Falkland (Overseas Territories) (Amendment) Order 2012; Islands) applies to South Georgia and the South Sandwich Islands by reference to the Application of Colonies Laws 2012 No 2749 – The Liberia (Restrictive Measures) Ordinance 1967 (No 1of 1967, Falkland Islands). (Overseas Territories) (Amendment) Order 2012; 2. Section 5 of the Ordinance provides that the Police 2012 No 2750 – The Democratic Republic of the Congo Force shall consist of such police officers as may from time (Restrictive Measures) (Overseas Territories) (Amendment) to time be approved by the Commissioner and enrolled in Order 2012; the Force.
    [Show full text]
  • Research Vessel POLARSTERN PS119: 13.04
    Research vessel POLARSTERN PS119: 13.04. – 31.05.2019 Punta Arenas ‐ Port Stanley Sixth weekly report: 13. – 19. May, 2019 To the smoking volcano of Saunders Island Like last week, we spent the sixth week in the southernmost area of the South Sandwich Plate, from the back‐arc spreading ridge of the segments 8 and 9 in the west to the Kemp Caldera. The volcano of Kemp Caldera is part of the collision zone with the South American plate to the East. A look to our expedition logo shows symbolically the spreading ridge on the left and flowing to the right the volcanoes, fore‐arc area and subduction zone. The weather conditions, which denied from Sunday to Tuesday morning further dives, permitted not until Tuesday to dive down with ROV QUEST to the seafloor. We used the dive‐free time for the deployment of other sampling gear. On Sunday, 12th of May, we sampled the deepest area of the Kemp caldera with a 3 m long gravity corer and the multi‐corer. The until then surveyed Parasound profiles over the caldera showed in the deepest area narrow sediment layers, whose mineral and chemical composition in references to hydrothermal deposits are of huge interest. With our corers we were able to sample sediment layers of 230 cm depth, which surprised us by their colouring and diverse sediment compositions. Figure 1: Penguins being washed up by a wave’s high to an Figure 2: Analyses of sediment cores in the laboratory of an iceberg following by a steep climb (© Carsten Zillgen). Polarstern.
    [Show full text]
  • A New Vent Limpet in the Genus Lepetodrilus (Gastropoda: Lepetodrilidae) from Southern Ocean Hydrothermal Vent Fields Showing High Phenotypic Plasticity
    fmars-06-00381 July 15, 2019 Time: 15:56 # 1 ORIGINAL RESEARCH published: 16 July 2019 doi: 10.3389/fmars.2019.00381 A New Vent Limpet in the Genus Lepetodrilus (Gastropoda: Lepetodrilidae) From Southern Ocean Hydrothermal Vent Fields Showing High Phenotypic Plasticity Katrin Linse1*, Christopher Nicolai Roterman2 and Chong Chen3 1 British Antarctic Survey, Cambridge, United Kingdom, 2 Department of Zoology, University of Oxford, Oxford, United Kingdom, 3 X-STAR, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan The recently discovered hydrothermal vent ecosystems in the Southern Ocean host a suite of vent-endemic species, including lepetodrilid limpets dominating in abundance. Limpets were collected from chimneys, basalts and megafauna of the East Scotia Ridge Edited by: segments E2 and E9 and the Kemp Caldera at the southern end of the South Sandwich Wei-Jen Chen, Island arc. The limpets varied in size and shell morphology between vent fields and National Taiwan University, Taiwan displayed a high degree of phenotypic plasticity. Size frequency analyses between vent Reviewed by: fields suggests continuous reproduction in the limpet and irregular colonisation events. Marjolaine Matabos, Institut Français de Recherche pour Phylogenetic reconstructions and comparisons of mitochondrial COI gene sequences l’Exploitation de la Mer (IFREMER), revealed a level of genetic similarity between individuals from the three vent fields France Junlong Zhang, consistent with them belonging to a single molecular operational taxonomic unit. Here Institute of Oceanology (CAS), China we describe Lepetodrilus concentricus n. sp., and evaluate its genetic distinctness and *Correspondence: pylogenetic position with congeners based on the same gene. Results indicate that Katrin Linse L.
    [Show full text]
  • Ecophysiology and Ecological Limits of Symbiotrophic Vesicomyid Bivalves (Pliocardiinae) in the Southern Ocean
    Ecophysiology and ecological limits of symbiotrophic vesicomyid bivalves (Pliocardiinae) in the Southern Ocean Linse, K., Sigwart, J. D., Chen, C., & Krylova, E. M. (2020). Ecophysiology and ecological limits of symbiotrophic vesicomyid bivalves (Pliocardiinae) in the Southern Ocean. Polar Biology, 43(10), 1423-1437. https://doi.org/10.1007/s00300-020-02717-z Published in: Polar Biology Document Version: Publisher's PDF, also known as Version of record Queen's University Belfast - Research Portal: Link to publication record in Queen's University Belfast Research Portal Publisher rights Copyright 2020 the authors. This is an open access article published under a Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited. General rights Copyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. Take down policy The Research Portal is Queen's institutional repository that provides access to Queen's research output. Every effort has been made to ensure that content in the Research Portal does not infringe any person's rights, or applicable UK laws. If you discover content in the Research Portal that you believe breaches copyright or violates any law, please contact [email protected]. Download date:05. Oct. 2021 Polar Biology (2020) 43:1423–1437 https://doi.org/10.1007/s00300-020-02717-z ORIGINAL PAPER Ecophysiology and ecological limits of symbiotrophic vesicomyid bivalves (Pliocardiinae) in the Southern Ocean Katrin Linse1 · Julia D.
    [Show full text]
  • Research Vessel POLARSTERN PS119: 13.04
    Research Vessel POLARSTERN PS119: 13.04. – 31.05.2019 Punta Arenas ‐ Port Stanley Fifth Weekly Report: 06. – 12. May, 2019 White smoker and yellow sulphur of the Kemp Caldera On Sunday, 5th May, we arrived at the Kemp Caldera, a prominent crater of volcanic origin at the southern end of the South Sandwich volcanic arc. The caldera, which has an average diameter of 7.4 km, has a depth of 1600m in its centre and has a wide rim with several secondary cones in 800‐900 m water depth (Fig. 1). A younger volcanic cone rise up to about 200 m from the western bottom of the crater. A first measurement with the CTD sensors on Sunday, 5th May, over a known hydrothermal vent field confirmed, that hydrothermal activity was still present. Next to a distinctly increased turbidity, also increased temperatures and an anomaly in the redox potential of the water column near the thermal area was observed. On Monday, 6th May, we deployed a gravity corer and a multicorer half way between the caldera to the East and the segment E9 of the East Scotia Ridge to the West. In the night from Monday to Tuesday, a further CTD followed as well as seafloor survey with the OFOBS (Ocean Floor Observation Bathymetry System). On Tuesday, 7th May, at last we were able to conduct a long ROV dive in the Kemp Caldera with more than 11 hours on the seafloor (Fig. 2). We started the dive at the location “Great Wall”, which got its name from an altered hypabyssal rock covered at many places with either yellow sulphur or white bacterial mats.
    [Show full text]
  • Volcanic Evolution of the South Sandwich Volcanic Arc, South Atlantic, from Multibeam Bathymetry
    ÔØ ÅÒÙ×Ö ÔØ Volcanic evolution of the South Sandwich volcanic arc, South Atlantic, from multibeam bathymetry Philip T. Leat, Simon J. Day, Alex J. Tate, Tara J. Martin, Matthew J. Owen, David R. Tappin PII: S0377-0273(13)00255-2 DOI: doi: 10.1016/j.jvolgeores.2013.08.013 Reference: VOLGEO 5192 To appear in: Journal of Volcanology and Geothermal Research Received date: 1 May 2013 Accepted date: 24 August 2013 Please cite this article as: Leat, Philip T., Day, Simon J., Tate, Alex J., Martin, Tara J., Owen, Matthew J., Tappin, David R., Volcanic evolution of the South Sandwich volcanic arc, South Atlantic, from multibeam bathymetry, Journal of Volcanology and Geothermal Research (2013), doi: 10.1016/j.jvolgeores.2013.08.013 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPT Volcanic evolution of the South Sandwich volcanic arc, South Atlantic, from multibeam bathymetry Philip T. Leat1,2*, Simon J. Day3, Alex J. Tate1, Tara J. Martin1,4 Matthew J. Owen5, David R. Tappin6 1 British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK [email protected]; [email protected] 2 Department of Geology, University
    [Show full text]
  • James Hamilton Mclean: the Master of the Gastropoda
    Zoosymposia 13: 014–043 (2019) ISSN 1178-9905 (print edition) http://www.mapress.com/j/zs/ ZOOSYMPOSIA Copyright © 2019 · Magnolia Press ISSN 1178-9913 (online edition) http://dx.doi.org/10.11646/zoosymposia.13.1.4 http://zoobank.org/urn:lsid:zoobank.org:pub:20E93C08-5C32-42FC-9580-1DED748FCB5F James Hamilton McLean: The master of the Gastropoda LINDSEY T. GROVES1, DANIEL L. GEIGER2, JANN E. VENDETTI1, & EUGENE V. COAN3 1Natural History Museum of Los Angeles County, Malacology Department, 900 Exposition Blvd., Los Angeles, California 90007, U.S.A. E-mail: [email protected]; [email protected] 2Santa Barbara Museum of Natural History, Department of Invertebrate Zoology, 2559 Puesta del Sol, Santa Barbara, California 93105, U.S.A. E-mail: [email protected] 3P.O. Box 420495, Summerland Key, Florida 33042, U.S.A. E-mail: [email protected] Abstract A biography of the late James H. McLean, former Curator of Malacology at the Natural History Museum of Los Angeles County is provided. It is complemented with a full bibliography and list of 344 taxa named by him and co-authors (with type information and current status), as well as 40 patronyms. Biography James Hamilton McLean was born in Detroit, Michigan, on June 17, 1936. The McLean family moved to Dobbs Ferry, New York, on the Hudson River in 1940, a short train ride and subway ride away from the American Museum of Natural History (AMNH). His brother Hugh recalled that, “AMNH became the place of choice to go to whenever we could get someone to take us. Those visits opened our eyes to the variety and possibilities of what was out there, waiting for us to discover and collect.” From an early age James seemed destined to have a career at a museum (Figs 1–2).
    [Show full text]