DOCSLIB.ORG

M Raraes DEDICATION

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
M Raraes DEDICATION FLEXURE OF THE OCEANIC LITHOSPHERE IN THE VICINITY OF THE MARQUESAS ISLANDS by PAUL EDWARD FILMER B.Sc. with Honors, Geophysics California Institute of Technology (1985) SUBMITrED TO THE DEPARTMENT OF EARTH, ATMOSPHERIC AND PLANETARY SCIENCES IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY at the MASSACHUSETTS INSTITUTE OF TECHNOLOGY November 1991 © Massachusetts Institute of Technology, 1991. All rights reserved. Signature of author .- - Department of Earth, Atmospheric and Planetary Sciences Certified by Marcia K. McNutt /- Department of Earth, Atmospheric and Planetary Sciences Accepted by Thomas H. Jordan Chairman, Department of Earth, Atmospheric and Planetary Sciences M RARaES DEDICATION 'Where shall I begin, please your Majesty?' he asked. 'Begin at the beginning,' the King said gravely, 'and go on till you come to the end: then stop.' Lewis Carroll Alice in Wonderland, ch. 11 This thesis is dedicated to the memory of my aunt, Agnes Waldron, who died six weeks before I defended. When I was young, I regarded her with fear: her unswerving wit and acerbic tongue were, for me and many others, like facing the Red Queen. Now that she is gone, I realize that she was really only Alice after all. iii TABLE OF CONTENTS DEDICATION........................................................................................ ii LIST OF FIGURES .................................................................................... vi LIST OF TABLES ................................................................................... ix ACKNOWLEDGEMENTS ........................................................................... x CURRICULUM VITAE............................................................................xiv PROLEGOMENON .................................................................................. xv ABSTRACT.......................................................................................xvi CHAPTER ONE The Marquesas Islands ................................................................... 1 1.1. Setting of the Survey Area ....................................................... 2. 1.2. Organization of the Thesis .......................................... ...... 7 1.3. Publication of Results .............................................................. 11 CHAPTER TWO The Alignment of Seafloor Features ................................................... 12 2.1. Introduction ....................................................................... 12 2.2. Data Collection .................................................... 15 2.3. Seafloor Features .................................................... 17 2.3.1. Feature type ............................................................ 23 2.3.1.1. Seamounts .................................................. 23 2.3.1.2. Ridges and lineations ...................................... 23 2.3.1.3. The Tuamotu Plateau ........................................25 2.3.1.4. The Marquesas Fracture Zone ............................25 2.3.2. Latitude and longitude of features ..................... 28 2.3.3. Depth and height of features ............................................ 28 2.3.4. Axial lengths and trends ................................................ 28 2.3.5. Dike and rift zone trends ................. 29 2.4. Feature Trends and Sizes......................................................... 41 2.4.1. Lineation statistics ...... ............................................ 45 2.4.2. Seamount and ridge major axis statistics...........................45 2.4.3. Dike trend statistics................... ................................52 2.4.4. Seamount dimensions............. ..................................52 2.5. Discussion ................................................................. 61 2.5.1. Fabric lineations and magnetic lineations ............................. 61 2.5.2. Seamount major axis alignment ........................................ 64 2.5.3. Dike alignments ........ ............................... 69 2.5.4. Other concerns ......................................................... 75 2.6. Conclusions..........................................................................75 CHAPTER THREE Island Volcanism and Archipelagic Aprons ............................................ 77 3.1. Introduction............................ ........................................... 77 3.1.1. Mass wasting............................................................ 78 3.1.2. Subsidence, mass wasting, and the sediments of the apron........80 3.2. Refraction Lines...................................................................82 3.2.1. Sonobuoy record interpretation....................... ..... 86 3.3. Reflection Profiles ................................................................ 90 3.3.1. Abyssal hills and pelagic sediment cover.......................... 90 3.3.2. Sediment ponds and apron turbidites ............................ 91 3.3.3. Inter-island sediments ................................................. 91 3.3.4. Volcanic carapace ........ .......... ................................ 97 3.4. Discussion....... .......................................................... 101 3.4.1. Volcanic stages and apron development............................ 104 3.4.2. Catastrophic collapses ................................................. 106 3.4.3. Areal extent of the apron ............................................. 107 3.4.4. Volume of apron sediments and building cycles ................ 109 3.5. Conclusions ....................................................................... 110 CHAPTER FOUR The Oceanic Lithosphere Under the Marquesas Islands ............................. 111 4.1. Introduction ................................................................................................ 111 4.2. Gravity Data....................................................................... 112 4.2.1. Adopted terminology ...................................... 116 4.2.2. Shipboard and satellite derived gravity ........................... 117 4.3. Revised Maps for the Marquesas ............................................. 117 4.4. Gravity Modelling ................................................................ 122 4.4.1. Local compensation..................................................... 124 4.4.2. Regional compensation ................................................ 124 4.4.2.1. Plate flexure .................................................. 125 4.4.3. Flexural effects on the gravity field ................................ 126 4.4.4. Initial estimates of Te and Ap.................................. 130 4.4.5. Two-dimensional models .......................................... 133 4.4.5.1. Admittance............................................... 134 4.4.5.2. Admittance results ........................................... 135 4.4.5.3. Forward modelling ...................................... 148 4.4.6. Three-dimensional models .......................................... 154 4.4.7. Convergence of the series................................. 155 4.5. D iscussion........................... ............................................ 161 4.5.1. Off-track bathymetry .................................................. 163 4.5.2. Locked versus unlocked fracture zones ............................ 164 4.5.3. Top and bottom loading .......................................... 168 4.5.4. Trends in Te ........................................................... 175 4.6. Conclusions ..................................................................... 183 CHAPTER FIVE The Thermal Power of the Marquesas Hotspot... ......................... 184 5.1. Erupted Volume and Average Thermal Power .............................. 184 5.1.1. Total volume of erupted volcanic material......................... 187 5.1.2. Average thermal power.............................................. 187 5.2. Perturbation of the Geotherm ................................................. 192 5.3. Present Location and Activity of the Marquesas Hotspot.................. 194 5.4. Conclusions......................................................................... 196 APPENDIX A Circular Error Analysis ....................................... ..................................... 198 A.1. Circular, or Periodic Variables ............................................... 198 A.2. The Mean Direction of a Circular Distribution .............................. 199 A.3. Binning Effects ................................................................... 201 A.4. The von Mises Distribution ..................................................... 202 A.4.1. Best estimates for K, 01, and ...................................... 204 V A.4.2. Confidence intervals for the estimates of 01 and K.................205 A.4.3. Higher order moments of distributions ............................... 205 A.5. Tests for Randomness ..................... ....................................206 A.5.1. The Rayleigh Test....................................................207 A.5.2. The V-test ............................................................ 207 A.6. Circular-Linear Correlation ...................... 208 A.6.1. 'Linearizing' the problem.............................................208 A.6.2. The Nr2 test ................ ........................ ...... 208 APPENDIX B Errors in estimations of Te .................. ........................................209 APPENDIX C "Xi-squared" ......................................... 214
Load more

Recommended publications
  • The Marquesas
    © Lonely Planet Publications 199 The Marquesas Grand, brooding, powerful and charismatic. That pretty much sums up the Marquesas. Here, nature’s fingers have dug deep grooves and fluted sharp edges, sculpting intricate jewels that jut up dramatically from the cobalt blue ocean. Waterfalls taller than skyscrapers trickle down vertical canyons; the ocean thrashes towering sea cliffs; sharp basalt pinnacles project from emerald forests; amphitheatre-like valleys cloaked in greenery are reminiscent of the Raiders of the Lost Ark; and scalloped bays are blanketed with desert arcs of white or black sand. This art gallery is all outdoors. Some of the most inspirational hikes and rides in French Polynesia are found here, allowing walkers and horseback riders the opportunity to explore Nuku Hiva’s convoluted hinterland. Those who want to get wet can snorkel with melon- headed whales or dive along the craggy shores of Hiva Oa and Tahuata. Bird-watchers can be kept occupied for days, too. Don’t expect sweeping bone-white beaches, tranquil turquoise lagoons, swanky resorts and THE MARQUESAS Cancun-style nightlife – the Marquesas are not a beach holiday destination. With only a smat- tering of pensions (guesthouses) and just two hotels, they’re rather an ecotourism dream. In everything from cuisine and dances to language and crafts, the Marquesas do feel different from the rest of French Polynesia, and that’s part of their appeal. Despite the trap- pings of Western influence (read: mobile phones), their cultural uniqueness is overwhelming. They also make for a mind-boggling open-air museum, with plenty of sites dating from pre-European times, all shrouded with a palpable historical aura.
    [Show full text]
  • Societies Compendium a Compilation of Guidebook References and Cruising Reports
    The Societies Compendium A Compilation of Guidebook References and Cruising Reports Rev 2021.4 – 29 August 2021 Please send us updates to this guide! Keep the Societies Compendium alive by being a contributor. We are especially looking for information on places where we have no cruiser information, or new information on existing content. It’s easy to participate and will help many other cruisers for years to come. Email Soggy Paws at sherry –at- svsoggypaws –dot- com. You can also contact us on Sailmail at WDI5677 The current home (and the most up to date) version of this document is http://svsoggypaws.com/files/#frpoly If you found this Compendium posted elsewhere, it might not be the most current version. Please check the above site for the most up to date copy, and remember…it will always be free! Page 1 Revision Log Many thanks to all who have contributed over the years!! Rev Date Notes Info on anchoring cautions and restrictions in Raiatea from 2021.4 29 August 2021 Jaraman. A few updates on Moorea from Sugar Shack and Major Tom. 2021.3 23 July 2021 “Seniors” discount on Air Tahiti Updates on Raiatea from Trance. Updates from Ari B, and Grace of 2021.2 15 April 2021 Longstone 2021.1 04 January 2020 Updates from Chugach on Mopelia 2020.4 16 December 2020 Updates from Sugar Shack on Mo’orea 2020.3 08 November 2020 Updates from Uproar on Mopelia 2020.2 07 November 2020 Updates from Sugar Shack, Maple, and Baloo 2020.1 22 February 2020 Reorganization of compendium and updates from Sugar Shack 2019.3 28-July 2019 Updates from Sugar Shack and Cool Change Many updates from Moon Rebel, Bora Bora mooring update from 2019.2 06 June 2019 Nehenehe and Nor’Easter.
    [Show full text]
  • Traditional Marquesan Agriculture and Subsistence: the Historical Evidence
    Rapa Nui Journal: Journal of the Easter Island Foundation Volume 20 | Issue 2 Article 5 2006 Traditional Marquesan Agriculture and Subsistence: The iH storical Evidence David J. Addison ASPA Archaeological Specialists Department Supervisor Follow this and additional works at: https://kahualike.manoa.hawaii.edu/rnj Part of the History of the Pacific slI ands Commons, and the Pacific slI ands Languages and Societies Commons Recommended Citation Addison, David J. (2006) "Traditional Marquesan Agriculture and Subsistence: The iH storical Evidence," Rapa Nui Journal: Journal of the Easter Island Foundation: Vol. 20 : Iss. 2 , Article 5. Available at: https://kahualike.manoa.hawaii.edu/rnj/vol20/iss2/5 This Research Paper is brought to you for free and open access by the University of Hawai`i Press at Kahualike. It has been accepted for inclusion in Rapa Nui Journal: Journal of the Easter Island Foundation by an authorized editor of Kahualike. For more information, please contact [email protected]. Addison: Traditional Marquesan Agriculture and Subsistence Traditional Marquesan Agriculture and Subsistence: The Historical Evidence Part I of IV - General Descriptions, Garden Locations, the Agricultural Calendar, Hydrology and Soils, Cultigens, and Agricultural Techniques David1. Addison* HE MARQUESAS ISLANDS (Figure 1) have long captivated nario for the prehistoric involution of Marquesan power T the attention of social scientists. Members of the Bishop structures. Museum's Bayard-Dominick Expedition did the first fonnal While social and political structures and relationships anthropological and archaeological research in the archipel­ have been dominant research topics, little attention has been ago (Figure 2) in the early 20'h century (e.g.
    [Show full text]
  • Marquesas Islands)
    Motu Iti (Marquesas Islands) The uninhabited island located 42 kilometers northwest of Nuku Hiva, the largest island in the Marquesas. In fact, there Motu Iti of several tiny islets, all rise from the same basaltic base. In the east, the 0.2 -acre main island still a 300 x 80 m measuring, upstream 76 m from the sea projecting rock humps and two smallest rocky reefs. The main island is 670 m long, 565 m wide and reaches a height of 220 meters, it is a geologically very young volcanic island, which consists mainly of basalt rocks. Because of the low geological age Motu Iti is not surrounded by a sea on the outstanding coral Motu Iti (sometimes also called Hatu Iti) is one of the northern Marquesas Islands in French Polynesia. Located west-northwest from Nuku Hiva, Motu Iti is the site of extensive seabird rookeries. Motu Iti is administratively part of the commune (municipality) of Nuku-Hiva, itself in the administrative subdivision of the Marquesas Islands. Marquesas Islands of French Polynesia. Northern Marquesas: Eiao ⢠Hatutu ⢠Motu Iti ⢠Motu One ⢠Nuku Hiva ⢠Ua Huka ⢠Ua Pu. Southern Marquesas: Fatu Hiva ⢠Fatu Huku ⢠Hiva Oa ⢠Moho Tani ⢠Motu Nao ⢠Tahuata ⢠Terihi. Archipelagos of French Polynesia: Aust Motu Iti (Marquesas Islands). From Wikipedia, the free encyclopedia. This article is about the island in French Polonesia. For the islet off of Easter Island, see Motu Iti (Rapa Nui). Motu Iti. Motu Iti (sometimes also called Hatu Iti) is one of the northern Marquesas Islands in French Polynesia.
    [Show full text]
  • Origin of Basalts from the Marquesas Archipelago (South Central Pacific Ocean) : Isotope and Trace Element Constraints
    Earth atid Planetary Science Letters, 82 (1987) 145-152 145 Elsevier Science Publishers B.V., Amsterdam - Printed in The Netherlands Origin of basalts from the Marquesas Archipelago (south central Pacific Ocean) : isotope and trace element constraints C. Dupuy ', P. Vidal 2, H.G. Barsczus 193 and C. Chauve1 I Centre GPologique et Géophysique, CNRS et Université des Sciences et Techniques du h,nguedoc, pl. Eugène Bataillon, 34060 Montpellier Cedex (France) Origine, Evolution et Dynamique des Magmas (UA IO), CNRS et Université de Clermont-Ferrand I< 5, rue Kessler, 63038 Clertnont-Ferrand Cedex (France) Centre ORSTOM, B.P. 529, Papeete, Tahiti (Fretich Polynesia) Max-Planck-Institutfùr Chemie, Postfach 3060, 0-6500 Maim (ER.G.) Received April 9,1986; revised version accepted November 26,1986 Basalts from the Marquesas Archipelago display significant variations according to magmatic type in 143Nd/144Nd (0.512710-0.512925) and a7Sr/86Sr (0.70288-0.70561) suggesting heterogeneities at various scales in the mantle source, with respectively the highest and lowest values in tholeiites compared to alkali basalts. This relationship is the reverse from that observed in the Hawaiian islands. Systematic indications of magma mixing are recognized from the relationships between trace element and isotopic ratios. Tholeiites from Ua Pou Island which have unradiogenic Sr (about 0.7028) plot close to basalts from Tubuai and St. Helena, i.e. distinctly below the main mantle trend in the Nd vs. Sr isotopic diagram. It is suggested that the source of these tholeiites is ancient subducted lithosphere which has suffered previous extraction of liquid with island arc tholeiite composition.
    [Show full text]
  • Law of Thesea
    Division for Ocean Affairs and the Law of the Sea Office of Legal Affairs Law of the Sea Bulletin No. 82 asdf United Nations New York, 2014 NOTE The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of the Secretariat of the United Nations concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. Furthermore, publication in the Bulletin of information concerning developments relating to the law of the sea emanating from actions and decisions taken by States does not imply recognition by the United Nations of the validity of the actions and decisions in question. IF ANY MATERIAL CONTAINED IN THE BULLETIN IS REPRODUCED IN PART OR IN WHOLE, DUE ACKNOWLEDGEMENT SHOULD BE GIVEN. Copyright © United Nations, 2013 Page I. UNITED NATIONS CONVENTION ON THE LAW OF THE SEA ......................................................... 1 Status of the United Nations Convention on the Law of the Sea, of the Agreement relating to the Implementation of Part XI of the Convention and of the Agreement for the Implementation of the Provisions of the Convention relating to the Conservation and Management of Straddling Fish Stocks and Highly Migratory Fish Stocks ................................................................................................................ 1 1. Table recapitulating the status of the Convention and of the related Agreements, as at 31 July 2013 ........................................................................................................................... 1 2. Chronological lists of ratifications of, accessions and successions to the Convention and the related Agreements, as at 31 July 2013 .......................................................................................... 9 a. The Convention ....................................................................................................................... 9 b.
    [Show full text]
  • Cruising Guide Leeward Islands in French Polynesia
    Cruising Guide Leeward islands in French Polynesia Maeva ! Welcome aboard The Moorings Tahiti (+689) 66 35 93 www.moorings.fr Useful information 4 The Moorings itineraries 14 Summary Baggages......................................................................4 Moorings Itinerary 7 days ............................................15 Banks ..........................................................................4 Moorings Itinerary 10 days ..........................................15 Churches ......................................................................4 Moorings Itinerary 14 days ..........................................15 Communications ..........................................................4 Local Currency ..............................................................4 Emergency phone numbers....................................4 Arrival in Raiatea ..........................................................5 Fishing gear..................................................................5 Raiatea 16 Post Office ..................................................................5 Medical ........................................................................5 (R1) Marina Apooiti - Base Moorings ..........................16 Provisioning..................................................................5 (R20) Marina d’Uturoa ................................................16 Maeva Kayaks..........................................................................5 Uturoa........................................................................17
    [Show full text]
  • Web Supplement to “Ages of Seamounts, Islands and Plateaus on the Pacific Plate”, by Valérie Clouard & Alain Bonneville
    Web Supplement to “Ages of seamounts, islands and plateaus on the Pacific Plate”, by Valérie Clouard & Alain Bonneville Table 1 : Compilation of radiometric datings of seamounts and islands on the Pacific plate from 1645 samples. Data are sorted by chain, and further by island or seamount from south to north as this represents the general trend of Pacific plate motion since 120 Ma. Final sorting is according to the method used and the author. An average age, calculated by weighting each age by the inverse of its variance, is given when several ages have been determined for the same volcanic stage, by the same author, with the same method. In 2 this case the geographical coordinates are given only once for the line. The error associated with a mean age is calculated as 1/S(1/si ). TF denotes total fusion, IH step-heating or incremental heating, S age spectrum, I isochron, w whole rock, s single mineral. Long. E Latitude Age Error Average Average Name (island, seamount, Island or seamount Method Reference (degrees) (degrees) (Ma) (Ma) age (Ma) error plateau or sample) chain (Ma) 219.80 -29.00 0.00 0.00 Macdonald Austral observation (Johnson and Malahoff, 1971) 0.14 0.04 0.21 0.03 Macdonald Austral K/Ar (Diraison, 1991) 0.17 0.05 Macdonald Austral K/Ar (Diraison, 1991) 0.24 0.07 Macdonald Austral K/Ar (Diraison, 1991) 0.33 0.10 Macdonald Austral K/Ar (Diraison, 1991) 0.97 0.29 Macdonald Austral K/Ar (Diraison, 1991) 0.85 0.25 Macdonald Austral K/Ar (Diraison, 1991) 1.64 0.25 Macdonald Austral K/Ar (Diraison, 1991) 218.88 -28.76 29.21 0.61
    [Show full text]
  • Temporal and Geochemical Variability of Volcanic Products of The
    JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 98, NO. BI0, PAGES 17,649-17,665, OCTOBER 10, 1993 Temporaland GeochemicalVariability of VolcanicProducts of the MarquesasHotspot D. L. DESONIE1 AND R. A. DUNCAN Collegeof Oceanicand AtmosphericSciences, Oregon State University, Corvallis J. H. NATLAND 2 ScrippsInstitution of Oceanography,University of California,La Jolla The Marquesasarchipelago is a short,NW-SE trendingcluster of islandsand seamounts that formedas a result of volcanicactivity over a weak hotspot. This volcanicchain lies at the northernmargin of a broad regionof warm and compositionallydiverse mantle that meltsto build severalother subparallel volcanic lineaments.Basalts dredged from submergedportions of volcanoesalong the Marquesaslineament decrease in age from northwestto southeast.The new sampleage distributionyields a volcanicmigration rate significantlyslower than that expectedfor Pacificplate motion over a stationaryMarquesas hotspot. This and the aberrantorientation of the chain indicate deflectionof the plume by westwardupper mantle flow. The interactionof this weak plumewith uppermantle flow accountsfor the temporaland spatialpatterns in Marquesanvolcanism. The compositionsof subaerialand submarine basalts reflect the mixingof at least two mantle sources,distinguished by Sr, Nd, and Pb isotopeand trace elementcompositions. There is a consistentevolutionary pattern at each volcano,from early tholeiitic to later alkalic basalt eruptions. Tholeiitic and transitionallava compositionscan be derivedby variabledegrees of partial
    [Show full text]
  • Cruising Guide Leeward Islands French Polynesia
    Cruising guide Leeward Islands French Polynesia Maeva ! Welcome onboard 1 Useful informations 4 Itineraries 14 Contents Luggage ......................................................................4 One week………………… ………..................................15 Banks…. .....................................................................4 10 days…………………..…….........................................15 Religion.......................................................................4 2 weeks……………………………...................................15 Communication...........................................................4 Money.. .......................................................................4 Emergency………......................................................4 Arrival …………... .....................................................5 Fishing gear………......................................................5 Raiatea 16 Post office ...................................................................5 (R1)Apooiti Marina - Raiatea base.. ..............................16 Health...........................................................................5 (R20) Uturoa Marina.. .....................................................16 Provisioning…………….............................................5 Uturoa...............................................................................17 Kayaks..........................................................................5 Uturoa south east…. ........................................................17 Snorkeling…………………........................................5
    [Show full text]
  • Young Tracks of Hotspots and Current Plate Velocities
    Geophys. J. Int. (2002) 150, 321–361 Young tracks of hotspots and current plate velocities Alice E. Gripp1,∗ and Richard G. Gordon2 1Department of Geological Sciences, University of Oregon, Eugene, OR 97401, USA 2Department of Earth Science MS-126, Rice University, Houston, TX 77005, USA. E-mail: [email protected] Accepted 2001 October 5. Received 2001 October 5; in original form 2000 December 20 SUMMARY Plate motions relative to the hotspots over the past 4 to 7 Myr are investigated with a goal of determining the shortest time interval over which reliable volcanic propagation rates and segment trends can be estimated. The rate and trend uncertainties are objectively determined from the dispersion of volcano age and of volcano location and are used to test the mutual consistency of the trends and rates. Ten hotspot data sets are constructed from overlapping time intervals with various durations and starting times. Our preferred hotspot data set, HS3, consists of two volcanic propagation rates and eleven segment trends from four plates. It averages plate motion over the past ≈5.8 Myr, which is almost twice the length of time (3.2 Myr) over which the NUVEL-1A global set of relative plate angular velocities is estimated. HS3-NUVEL1A, our preferred set of angular velocities of 15 plates relative to the hotspots, was constructed from the HS3 data set while constraining the relative plate angular velocities to consistency with NUVEL-1A. No hotspots are in significant relative motion, but the 95 per cent confidence limit on motion is typically ±20 to ±40 km Myr−1 and ranges up to ±145 km Myr−1.
    [Show full text]
  • ROV) in the Marquesas Islands, French Polynesia (Crustacea: Decapoda
    Zootaxa 3550: 43–60 (2012) ISSN 1175-5326 (print edition) www.mapress.com/zootaxa/ ZOOTAXA Copyright © 2012 · Magnolia Press Article ISSN 1175-5334 (online edition) urn:lsid:zoobank.org:pub:214A5D4F-E406-4670-BBB6-2EA5931713E9 Deep-water decapod crustaceans studied with a remotely operated vehicle (ROV) in the Marquesas Islands, French Polynesia (Crustacea: Decapoda) JOSEPH POUPIN1, 4, LAURE CORBARI2, THIERRY PÉREZ3 & PIERRE CHEVALDONNÉ3 1Institut de Recherche de l’École Navale, IRENav, groupe des écoles du Poulmic, CC 600, Lanvéoc, F-29240 BREST Cedex 9, France. E-mail: [email protected] 2UMR7138 Systématique, Adaptation, Évolution, Muséum national d’Histoire naturelle, 43 rue Cuvier, 75005 Paris, France. E-mail: [email protected] 3UMR CNRS 7263 IMBE, Institut Méditerranéen de la Biodiversité et d'Écologie marine et continentale, Aix-Marseille Université, Station Marine d'Endoume, Rue de la Batterie des Lions, 13007 Marseille, France. E-mail: [email protected], [email protected] 4Corresponding author Abstract Decapod crustaceans were studied in the Marquesas Islands, French Polynesia, between 50–550 m by using a remotely operated vehicle (ROV) equipped with high resolution cameras and an articulated arm. Careful examination of videos and photographs combined with previous inventories made in the area with conventional gears allowed the identification of 30 species, including 20 species-level determinations. Species identified belong to shrimps (Penaeoidea, Stenopodidea, and Caridea), lobsters (Astacidea and Achelata), anomurans (Galatheoidea and Paguroidea), and brachyuran crabs (Dromioidea, Homolodromioidea, Raninoidea, Leucosioidea, Majoidea, Parthenopoidea, Portunoidea, and Trapezioidea). Most of these species were observed and photographed in situ for the first time. A discussion is given on the geographic distribution, density, ecology, and behavior.
    [Show full text]