DOCSLIB.ORG

Status of the Ruddy-Headed Goose Chloephaga Rubidiceps (Aves, Anatidae): a Species in Serious Danger of Extinction in Fuego-Patagonia

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Status of the Ruddy-Headed Goose Chloephaga Rubidiceps (Aves, Anatidae): a Species in Serious Danger of Extinction in Fuego-Patagonia Revista Chilena de Historia Natural 67: 341 -349, 1994 Status of the Ruddy-headed Goose Chloephaga rubidiceps (Aves, Anatidae): a species in serious danger of extinction in Fuego-Patagonia Status del Canquen (o Cauquen) colorado Chloephaga rubidiceps (Aves, Anatidae): una especie en grave peligro de extinci6n en Fuego-Patagonia FRANÇOIS VUILLEUMIER Department of Ornithology, American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024, USA RESUMEN El status del Canquen (Chile) o Cauquen (Argentina) colorado Chloephaga rubidiceps (Aves, Anatidae ), es discutido sobre Ia base de observaciones llevadas a cabo en 1985-1988 y 1993 en Fuego-Patagonia chilena. Se observola especie durante un total de sólo 35 dfas (de los 103 dfas de terreno): 9 en el continente y 26 en Isla Grande de Tierra del Fuego. La especie no fue observada en Isla Navarino. Se registrola nidificacion en una sóla ocasion. Tambien se menciona una observacion de C. rubidiceps en Ia parte argentina de Tierra del Fuego y una en Neuquen, Patagonia argentina, fuera del rango normal de Ia especie. Se estima que el total de indivfduos avistados no superaba los 75. La distribucion y abundancia relativa de C. rubidiceps en Fuego-Patagonia en 1985-1988 y 1993 son comparadas con sus tres especies congenericas, C. picta, C. poliocephala y C. hybrida. Aunque distribuido en varios sectores de Fuego-Patagonia chilena, C. rubidiceps es sumamente raro en esta region, y su abundancia ha disminuido dnisticamente en las ultimas cuatro decadas. La poblacion total de Fuego- Patagonia chileno-argentina quizas no alcanza a algunos centenares de indivfduos. Se discuten las razones posibles de esta disminucion y se sugieren medidas para empezar Ia tarea urgente de conservacion de esta especie en peligro de extincion en America del Sur. Estas medidas incluyen Ia discontinuacion inmediata del status de C. rubidiceps como "plaga," ellistato inmediato de Ia especie en Ia lista "roja" de especies amenazadas de extincion, y una campafia de propaganda para sefialar a los residentes de Ia Patagonia Ia importancia de C. rubidiceps en los ecosistemas esteparias de su region. Palabras claves: Tierra del Fuego, Patagonia, Chile, Argentina, aves, Chloephaga rubidiceps, especie en peligro de extincion, conservacion. ABSTRACT The status of the Ruddy-headed Goose Chloephaga rubidiceps (Aves, Anatidae) is reviewed on the basis of observations in Chilean Fuego-Patagonia in 1985-1988 and 1993. The species was observed on a total of 35 days out of 103 field days: 9 on the continent and 26 on Isla Grande ofTierradel Fuego. The species was not seen on Navarino Island. Proof of breeding was obtained only once. Observations of C. rubidiceps in Argentine Tierra del Fuego in 1993 and in Neuquen, Argentine Patagonia, in 1992 outside the normal range of the species, are also cited. The total number of birds seen is estimated to be less than 75. The distribution and relative abundance of C. rubidiceps in Fuego-Patagonia in 1985-1988 and 1993 are compared with its three congeners C. picta, C. poliocephala, and C. hybrida. Although C. rubidiceps was found in several sectors of Chilean Fuego-Patagonia it is quite rare in this region, and its numbers have dramatically decreased in the last four decades. The total population in Chilean and Argentine Fuego-Patagonia may not exceed several hundred birds. The possible causes of this decline are discussed, and measures are suggested for the urgent job of conserving this species, which is in serious danger of becoming extinct in South America. These measures include immediate removal of C. rubidiceps from the list of pest (plaga) species and its placement on the endangered list, and a campaign to advertise the plight of the species and to indicate to residents of Patagonia the importance of the species in the steppe ecosystem of their region. Key words: Tierra del Fuego, Patagonia, Chile, Argentina, birds, Chloeplzaga rubidiceps, endangered species, conservation. INTRODUCTION spend the austral winter on the Argentine pampas, but the Falkland population is The Ruddy-headed Goose Chloephaga resident (Delacour 1954: 214-216, Meyer rubidiceps (Anatidae) breeds only in de Schauensee 1966:39, Woods 1988: 138- Chilean and Argentine Fuego-Patagonia 139, Madge & Burn 1988: 176). (Patagonian mainland and Tierra del Fue- Together with four other species (C. pi eta go, southernmost South America) and the and C. hybrida, both in southern South Falkland (Malvinas) Islands. The South America and the Falklands; C. poliocephala, American population migrates north to southern South America; and C. (Recibido el 20 de octubre de 1993; aceptado el 21 de junio de 1994) 342 VUILLEUMIER melanoptera, Andes), C. rubidiceps is part del Fuego, Chile. Tierra del Fuego, Argen- of a little studied adaptive radiation of tina, northward in winter to Buenos Aires. goose-like shelducks (Tadornini) endemic Extralimital range: Falkland Islands." to the Andes and Patagonia. Whereas Venegas & Jory (1979: 68) gave infor- Chloephaga rubidiceps, C. picta, C. mation for Chile: "Se encuentra en vegas poliocephala, and C. melanoptera occur in esteparias y matorral en Tierra del Fuego, grasslands and shrubsteppes, C. hybrida Magallanes centro-oriental y Ultima Es- lives in the kelp-covered, rocky intertidal peranza," and Clark (1986: 96) mentioned zone along the Pacific coast of southern northern and occasionally the east coast of South America, southward to the Tierra del Isla Grande and northwestern Navarino Fuego and Cape Horn Archipelagos Island. In the Falkland (Malvinas) Islands, (Murphy 1936: 942-947). it occurs mostly on "coastal slopes" (Woods Formerly abundant in its restricted South 1988: 138). Fjeldså& Krabbe (1990: 120) American range (Crawshay 1907: 99-100, mapped the breeding distribution in Fuego- Olrog 1948:470, Scott 1954:59, Humphrey Patagonia and the Falklands, and the et al. 1970: 112), Chloephaga rubidiceps migratory and wintering range of the South has declined dramatically in the last four American population in Argentine decades. For example, Jehl & Rumboll Patagonia north to Buenos Aires Province. (1976: 146) wrote: "This species is clearly on the verge of extirpation", Rum boll (1975: 315) sounded the alarm, and Fjeld sa Status & Krabbe ( 1990: 120) called it "a vanishing species." Still common in the Falklands, C. Crawshay (1907: 100) wrote that rubidiceps has decreased numerically on Chloephaga rubidiceps had recently those islands as well (Woods 1988: 138). increased in numbers in Tierra del Fuego:: Although Collar & Andrew (1988: 19) "A few years ago, the sheepmen tell me, included this species in their list of these Geese did not exist in anything threatened species, Collar et al. ( 1993) did approaching their present numbers: a yearly not include it in their list of threatened increase has been remarkable in their species of the Americas. immigration which is attributed to the In this paper, I summarize the distribution brushwood being eaten away by sheep, and and status of Chloephaga rubidiceps and the growth of fine grass." About forty years report my observations in Chilean Fuego- later, Olrog (1948: 4 70) reported "Gran des Patagonia in 1985-1988 and 1993, and one bandadas de centenares de aves" [italics observation from Argentine Tierra del mine] near Estancia Viamonte and Puerto Fuego (1993) and one from Neuquen, Ar- Rfo Grande, and Ripley (1950: 4) reported gentina (1992). I conclude that this species the species as "the second most common is at serious risk of extinction and make species in the area [of Rfo Grande]." suggestions for conservation measures that According to Scott ( 1954: 59) C. rubidiceps should be taken immediately if this species was "the commonest goose round the farms is to survive in the future. in the open pampa of the northern part of the island [of Tierra del Fuego]." At Estan- cia Marfa Behety Scott ( 1954: 59) estimated DISTRIBUTION AND STATUS OF CHLOEPHAGA that 25% or 7 5 individuals out of a flock of RUBIDICEPS 300 Chloephaga spp. were C. rubidiceps, and at Caleta J osefina he saw "masses of Distribution Ruddy heads [C. rubidiceps] ."Philippi et al. (1954: 26) also noted that at Caleta Josefina Delacour (19 54: 215) wrote that the it breeds "en gran numero," but, somewhat distribution of Chloephaga rubidiceps was at odds with the reports of abundance cited "still imperfectly understood" and Meyer above, stated that on Isla Grande it breeds de Schauensee (1966: 39) summarized it as "en numero reducido." According to follows: "Southern Magallanes and Tierra Johnson (1965: 18 7), their numbers "attain STATUS OF CHLOEPHAGA RUBIDICEPS 343 countless thousands" [italics mine] in Tie- 150,000 in 1972-1973 (Weller 1975). rra del Fuego. Johansen (1966: 229) Although it is not known how many eggs of indicated that C. rubidiceps was especially C. rubidiceps were destroyed during such common (haiifig) in the eastern part of attempts at eradication of C. picta, Weller Tierra del Fuego. Humphrey et al. (1970: (1975) believed that many eggs of C. 112) wrote "This common species [my rubidiceps were taken at the same time. italics] is found in summer on the northern, Recent reports indicate that in Chilean nonforested part of Isla Grande." Fuego-Patagonia Chloephaga rubidiceps Clearly Chloephaga rubidiceps used to "No es extremadamente comun aunque a be common but is now quite rare in South menudo su presencia es inadvertida entre America (see below and next section). bandadas de Ch. picta" (Venegas & Jory Although "still common"
Load more

Recommended publications
  • Chile: a Journey to the End of the World in Search of Temperate Rainforest Giants
    Eliot Barden Kew Diploma Course 53 July 2017 Chile: A Journey to the end of the world in search of Temperate Rainforest Giants Valdivian Rainforest at Alerce Andino Author May 2017 1 Eliot Barden Kew Diploma Course 53 July 2017 Table of Contents 1. Title Page 2. Contents 3. Table of Figures/Introduction 4. Introduction Continued 5. Introduction Continued 6. Aims 7. Aims Continued / Itinerary 8. Itinerary Continued / Objective / the Santiago Metropolitan Park 9. The Santiago Metropolitan Park Continued 10. The Santiago Metropolitan Park Continued 11. Jardín Botánico Chagual / Jardin Botanico Nacional, Viña del Mar 12. Jardin Botanico Nacional Viña del Mar Continued 13. Jardin Botanico Nacional Viña del Mar Continued 14. Jardin Botanico Nacional Viña del Mar Continued / La Campana National Park 15. La Campana National Park Continued / Huilo Huilo Biological Reserve Valdivian Temperate Rainforest 16. Huilo Huilo Biological Reserve Valdivian Temperate Rainforest Continued 17. Huilo Huilo Biological Reserve Valdivian Temperate Rainforest Continued 18. Huilo Huilo Biological Reserve Valdivian Temperate Rainforest Continued / Volcano Osorno 19. Volcano Osorno Continued / Vicente Perez Rosales National Park 20. Vicente Perez Rosales National Park Continued / Alerce Andino National Park 21. Alerce Andino National Park Continued 22. Francisco Coloane Marine Park 23. Francisco Coloane Marine Park Continued 24. Francisco Coloane Marine Park Continued / Outcomes 25. Expenditure / Thank you 2 Eliot Barden Kew Diploma Course 53 July 2017 Table of Figures Figure 1.) Valdivian Temperate Rainforest Alerce Andino [Photograph; Author] May (2017) Figure 2. Map of National parks of Chile Figure 3. Map of Chile Figure 4. Santiago Metropolitan Park [Photograph; Author] May (2017) Figure 5.
    [Show full text]
  • Redalyc.A Late Eocene Age Proposal for the Loreto Formation (Brunswick
    Andean Geology ISSN: 0718-7092 [email protected] Servicio Nacional de Geología y Minería Chile Otero, Rodrigo A; Torres, Teresa; Le Roux, Jacobus P.; Hervé, Francisco; Fanning, C. Mark; Yury- Yáñez, Roberto E.; Rubilar-Rogers, David A Late Eocene age proposal for the Loreto Formation (Brunswick Peninsula, southernmost Chile), based on fossil cartilaginous fishes, paleobotany and radiometric evidence Andean Geology, vol. 39, núm. 1, enero, 2012, pp. 180-200 Servicio Nacional de Geología y Minería Santiago, Chile Available in: http://www.redalyc.org/articulo.oa?id=173922203009 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Andean Geology 39 (1): 180-200. January, 2012 Andean Geology formerly Revista Geológica de Chile www.andeangeology.cl A Late Eocene age proposal for the Loreto Formation (Brunswick Peninsula, southernmost Chile), based on fossil cartilaginous fishes, paleobotany and radiometric evidence Rodrigo A. Otero1, Teresa Torres2, Jacobus P. Le Roux3, Francisco Hervé4, C. Mark Fanning5, Roberto E. Yury-Yáñez6, David Rubilar-Rogers7 1 Consejo de Monumentos Nacionales, Av. Vicuña Mackenna 084, Providencia, Santiago, Chile. [email protected] 2 Facultad de Ciencias Agronómicas, Universidad de Chile, Av. Santa Rosa 11315, Santiago, Chile. [email protected] 3 Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile. [email protected] 4 Escuela de Ciencias de la Tierra, Facultad de Ingeniería, Universidad Nacional Andrés Bello, Sazie 2350, Santiago, Chile.
    [Show full text]
  • A Late Eocene Age Proposal for the Loreto Formation (Brunswick Peninsula, Southernmost Chile), Based on Fossil Cartilaginous
    Andean Geology 39 (1): 180-200. January, 2012 Andean Geology formerly Revista Geológica de Chile www.andeangeology.cl A Late Eocene age proposal for the Loreto Formation (Brunswick Peninsula, southernmost Chile), based on fossil cartilaginous fishes, paleobotany and radiometric evidence Rodrigo A. Otero1, Teresa Torres2, Jacobus P. Le Roux3, Francisco Hervé4, C. Mark Fanning5, Roberto E. Yury-Yáñez6, David Rubilar-Rogers7 1 Consejo de Monumentos Nacionales, Av. Vicuña Mackenna 084, Providencia, Santiago, Chile. [email protected] 2 Facultad de Ciencias Agronómicas, Universidad de Chile, Av. Santa Rosa 11315, Santiago, Chile. [email protected] 3 Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile. [email protected] 4 Escuela de Ciencias de la Tierra, Facultad de Ingeniería, Universidad Nacional Andrés Bello, Sazie 2350, Santiago, Chile. [email protected] 5 Research School of Earth Sciences, Australian National University, Canberra, Australia. [email protected] 6 Laboratorio de Zoología de Vertebrados, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago, Chile. [email protected] 7 Área Paleontología, Museo Nacional de Historia Natural, Casilla 787, Santiago, Chile. [email protected] ABStract. We present new data on the paleoichthyology, paleobotany and radiometric results of the Loreto Formation in the Brunswick Peninsula of southernmost Chile, that allow us to propose a Late Eocene age. The rich diversity of fossil cartilaginous fishes (Chondrichthyes, Elasmobranchii) recognized in upper levels of this unit includes the taxa Carcharias aff. ‘hopei’ (Agassiz), Odontaspis sp., Carcharoides catticus (Philippi), Striatolamia macrota (Agassiz), Anomotodon sp., Macrorhizodus praecursor (Leriche), Galeorhinus sp., Abdounia sp., Hexanchus sp., Squatina sp., Hexanchidae indet., Myliobatis sp., Myliobatoidea indet., and Ischyodus dolloi Leriche.
    [Show full text]
  • Download Pdf File
    Vol. 45 - N. 2 SUPPLEMENT Bollettino di Geofisica teorica ed applicata An International Journal of Earth Sciences Guest Editors: J. Carcione, F. Donda, E. Lodolo International Symposium on the Geology and Geophysics of the Southernmost Andes, the Scotia Arc and the Antarctic Peninsula Extended Abstracts of the GeoSur2004 International Symposium 22-23 November, 2004 Buenos Aires, Argentina Istituto Nazionale di Oceanografia ISSN 0006-6729 e di Geofisica Sperimentale Responsibility for all statements made in B.G.T.A. lies with the authors Cover design and typesetting: Nino Bon – OGS Printing: Centro Box SRL – Buenos Aires, Argentina Authorized by the Tribunale di Trieste, n. 242, September 17, 1960 INTERNATIONAL SYMPOSIUM International Symposium on the Geology and Geophysics of the Southernmost Andes, the Scotia Arc and the Antarctic Peninsula 22-23 November 2004 Buenos Aires, Argentina EXTENDED ABSTRACTS GEOSUR2004 22-23 NOVEMBER 2004 – BUENOS AIRES ORGANIZERS ISTITUTO NAZIONALE DI OCEANOGRAFIA E DI GEOFISICA SPERIMENTALE - OGS, TRIESTE, ITALY INSTITUTO DE GEOFÍSICA “DANIEL A. VALENCIO”, DEPARTAMENTO DE GEOLOGÍA, UNIVERSIDAD DE BUENOS AIRES, ARGENTINA SPONSORS ITALIAN EMBASSY IN ARGENTINA PROGRAMMA NAZIONALE DI RICERCHE IN ANTARTIDE (P.N.R.A.) EAGE-SEG Italian Section 4 GEOSUR2004 22-23 NOVEMBER 2004 – BUENOS AIRES SCIENTIFIC COMMITTEE G. BRANCOLINI - OGS, Trieste A. CAMERLENGHI - OGS, Trieste M. CANALS - University of Barcelona J.M. CARCIONE - OGS, Trieste A.H. COMÍNGUEZ - CONICET, University of La Plata I.W.D. DALZIEL - University of Texas at Austin E. DOMACK - Hamilton College, New York F. HERVÉ - University of Santiago R. LARTER - British Antarctic Survey S. MARENSSI - IAA, Buenos Aires G. PANZA - University of Trieste C.
    [Show full text]
  • The Swedish Magellanic Expedition: Preliminary Report
    CORE Metadata, citation and similar papers at core.ac.uk Provided by ZENODO The Swedish Magellanic Expedition: Preliminary Report. IV. Explorations in the Patagonian Channels between the Straits and the Gulf of Peñas Author(s): Carl Skottsberg Source: The Geographical Journal, Vol. 32, No. 6 (Dec., 1908), pp. 591-594 Published by: geographicalj Stable URL: http://www.jstor.org/stable/1777521 Accessed: 25-06-2016 01:58 UTC Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at http://about.jstor.org/terms JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected]. Wiley, The Royal Geographical Society (with the Institute of British Geographers) are collaborating with JSTOR to digitize, preserve and extend access to The Geographical Journal This content downloaded from 130.56.64.29 on Sat, 25 Jun 2016 01:58:07 UTC All use subject to http://about.jstor.org/terms ( 591 ) THE SWEDISH MAGELLANIC EXPEDITION: PRELIMINARY REPORT. By CARL SKOTTSBERG, D.Sc., Leader. IV. EXPLORATIONS IN THE PATAGONIAN CHANNELS BETWEEN THE STRAITS AND THE GULF OF PENAS. IN the original plan, presented to the Royal Geographical Society in Stockholm, I put the limit of our exploration of the Patagonian channels more to the south, for the only reason that I never thought it possible for us to extend our work as far as to the Gulf of Peias.
    [Show full text]
  • Chile Tourism Development Program (Ch-L1023 )
    DOCUMENT OF THE INTER -AMERICAN DEVELOPMENT BANK CHILE TOURISM DEVELOPMENT PROGRAM (CH-L1023) LOAN PROPOSAL This document was prepared by the project team consisting of: Adela Moreda (INE/RND), Project Team Leader; Leonardo Corral (INE/RND); Joseph Milewski (RND/CBR); Annette Killmer (INE/RND); Kevin McTigue (LEG/SGO); Alfredo Echegaray (CSC/CCH); and Rosario Gaggero (INE/RND). CONTENTS PROJECT SUMMARY I. FRAME OF REFERENCE ....................................................................................................1 A. Tourism in Chile ...................................................................................................1 B. The country’s sector strategy................................................................................4 C. The Bank’s country and sector strategy................................................................5 D. Program design .....................................................................................................6 II. THE PROGRAM ................................................................................................................8 A. Objective ...............................................................................................................8 B. Components ..........................................................................................................8 1. Development of new tourism offerings in Chile ..........................................8 2. Strengthening of the institutional framework for tourism..........................11 3. Support
    [Show full text]
  • Eradication of Beaver (Castor Canadensis), an Ecosystem Engineer and Threat to Southern Patagonia
    Malmierca, L.; M.F. Menvielle, D. Ramadori, B. Saavedra, A. Saunders, N. Soto Volkart, and A. Schiavini. Eradication of beaver (Castor canadensis), an ecosystem engineer and threat to southern Patagonia Eradication of beaver (Castor canadensis), an ecosystem engineer and threat to southern Patagonia L. Malmierca1, M. F. Menvielle1, D. Ramadori2, B. Saavedra3, A. Saunders4, N. Soto Volkart5, and A. Schiavini6 1National Parks Administration, Santa Fe 690, C1059ABN, Buenos Aires, Argentina. <[email protected]>. 2National Fauna Direction. San Martín 451 C1004AAI, Buenos Aires, Argentina. 3Wildlife Conservation Society, General Bustamante Av. 144, Of. 42. Providencia, Santiago, Chile. 4Landcare Research, P.B. 3127, Waikato Mail Centre, Hamilton, New Zealand. 5Agricultural and Livestock Service (SAG) Magallanes y Antártica Chilena, Chile. 6Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro Austral de Investigacioens Científicas (CADIC), Houssay 200 CP 9410, Ushuaia, Tierra del Fuego, Antártida e Islas del Atlántico Sur, Argentina, and Wildlife Conservation Society, Argentinean representation. ABSTRACT Beavers threaten ecosystems of global importance in southern Patagonia, causing significant impacts on biodiversity. Introduced in 1946, they have reached all the most important islands south of the Strait of Magellan and now are invading the Brünswick Peninsula, on the South American continent, occupying a total area of approximately 70,000 km2. After years of trying to promote beaver control by stimulating their commercial exploitation, the governments of Argentina and Chile agreed to redirect management efforts and to attempt to eradicate the species throughout its entire range in South America. As a first bi-national activity, a feasibility study, conducted by international experts, was jointly initiated, to assess the technical, ecological, economic, social and cultural feasibility of eradicating beavers over their entire range.
    [Show full text]
  • Roldan, Gabriela Final Phd Thesis.Pdf (5.166Mb)
    Searching for an Antarctic identity at the Antarctic Gateway Cities of Cape Town (South Africa), Christchurch (New Zealand), Hobart (Australia), Punta Arenas (Chile), and Ushuaia (Argentina) by Gabriela Roldan A thesis submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy October 2020 Gateway Antarctica, University of Canterbury - Te Whare Wānanga o Waitaha Map by Bronwyn Gay and Gabriela Roldan, 2020. ii Abstract The Antarctic gateway cities occupy a central role in providing access to Antarctica for people and goods. Located in the periphery of the Antarctic region, the gateways have developed many connections with the Southern Continent and, in general, they concentrate the polar political, economic and cultural associations of their host countries. This thesis seeks to explore the connections between people, ideas and knowledge in the cities of Cape Town (South Africa), Christchurch (New Zealand), Hobart (Australia), Punta Arenas (Chile) and Ushuaia (Argentina) and the Antarctic region, and to understand how these polar associations may influence gateway citizens in the construction of their identity. Central to these discussions is the influence Antarctic geopolitical agendas of the countries hosting the gateway cities have on their, and their citizens’, connections with Antarctica. Four of the five gateways are regional cities within Antarctic claimant countries. Due largely to coincidence of geography and politics, these cities occupy the role of Antarctic gateways, and receive national and international recognition of hosting associated polar agencies, as well as the economic benefits from the business generated by movement to and from Antarctica. Conversely, the South African gateway presents a distinctive case from the others; based in a non-claimant country and with historic internal power struggles, the largest of all gateways relates differently to Antarctica.
    [Show full text]
  • The Curved Magallanes Fold and Thrust Belt: Tectonic Insights from a Paleomagnetic and Anisotropy of Magnetic Susceptibility
    The curved Magallanes fold and thrust belt: Tectonic insights from a paleomagnetic and anisotropy of magnetic susceptibility study F Poblete, Pierrick Roperch, F Hervé, M Diraison, M Espinoza, C Arriagada To cite this version: F Poblete, Pierrick Roperch, F Hervé, M Diraison, M Espinoza, et al.. The curved Magallanes fold and thrust belt: Tectonic insights from a paleomagnetic and anisotropy of magnetic sus- ceptibility study. Tectonics, American Geophysical Union (AGU), 2014, 33 (12), pp.2526-2551. 10.1002/2014TC003555. insu-01119438 HAL Id: insu-01119438 https://hal-insu.archives-ouvertes.fr/insu-01119438 Submitted on 23 Feb 2015 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. PUBLICATIONS Tectonics RESEARCH ARTICLE The curved Magallanes fold and thrust belt: Tectonic 10.1002/2014TC003555 insights from a paleomagnetic and anisotropy Key Points: of magnetic susceptibility study • Sediments from the Magallanes fold and thrust belt have low magnetite F. Poblete1,2, P. Roperch2, F. Hervé1,3, M. Diraison4, M. Espinoza1, and C. Arriagada1 content • CCW
    [Show full text]
  • Importancia De La Formación En El Comportamiento De Los Suelos De Punta Arenas
    IMPORTANCIA DE LA FORMACIÓN EN EL COMPORTAMIENTO DE LOS SUELOS DE PUNTA ARENAS Ana Vásquez Díaz Universidad de Chile, MSc Ingeniería Geotécnica [email protected] Jacobus Le Roux Universidad de Chile, Ph.D.,University of Port Elizabeth Profesor Titular Departamento de Geología / CEGA, Universidad de Chile [email protected] Claudio Foncea Navarro SRK Consulting (Chile) S. A. MSc Ingeniería Geotécnica [email protected] RESUMEN Los suelos que cubren el área de la ciudad de Punta Arenas están constituidos en su mayor parte por sedimentos glaciales, fluvioglaciares y aluviales depositados durante las diferentes etapas del avance y retroceso del Último Máximo Glacial (UMG). El historial de carga y descarga, la forma de depósito, las estructuras inherentes, han establecido diferencias genéticas y mecánicas que han influido y determinado el comportamiento geotécnico de estos suelos. 1. INTRODUCCIÓN La zona del Estrecho de Magallanes fue sometida a eventos que modelaron y originaron una variedad de sedimentos de marcada heterogeneidad. Los avances y recesiones cíclicas de un lóbulo de hielo dejaron un conjunto de tills basales y de flujo, en tanto que la formación y represamiento de un gran lago proglacial dio lugar a depósitos glaciolacustres y relictos lineamientos costeros. Los estadios post-glaciales e inter-glaciales permitieron la formación de planicies de lavado (outwash plains), con pantanos, turbales y arcillas orgánicas. Las transgresiones y regresiones marinas, y la posterior acción fluvial de una compleja red de drenaje, depositaron y retrabajaron sedimentos aluviales y glaciofluviales. Estos depósitos heterogéneos constituyen los suelos de fundación de la zona urbana y suburbana de Punta Arenas. Las propiedades y comportamiento de estos suelos están controlados por su humedad, textura, estructura, composición mineral e historial carga-descarga.
    [Show full text]
  • Coastal Occupations in Tierra Del Fuego, Southernmost South America: a Geoarchaeological
    Coastal occupations in Tierra del Fuego, southernmost South America: a geoarchaeological study of a Late Holocene hunter-gatherer context Ivana L. Ozán1*, Charles A.I. French2, Flavia Morello Repetto3, Carlos A. Vásquez4, and Tomás Luppo4. 1* Instituto Multidisciplinario de Historia y Ciencias Humanas (IMHICIHU) - Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET). Saavedra 15 (C1083ACA) Buenos Aires, Argentina. E-mail: [email protected]. Tel.: +54 (11) 4953 8548, int. 214. 2 Division of Archaeology, Department of Archaeology and Anthropology, University of Cambridge. Downing Street, Cambridge CB2 3DZ, UK. E-mail: [email protected] 3 Universidad de Magallania, Instituto de la Patagonia, Centro de Estudios del Hombre Austral. Avenida Bulnes 01890 (6200000), Punta Arenas, Chile. E-mail: [email protected] 4.Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Departamento de Ciencias Geológicas – CONICET. Pabellón 2, Ciudad Universitaria (C1428EHA) Buenos Aires, Argentina. E-mail: [email protected]/ [email protected] Abstract (200) In the present work, we focus on Marazzi 2 Site, a Late Holocene short-lived-redundant occupation of terrestrial hunter-gatherer from the southeastern coast of Inútil Bay, northwestern steppe of Tierra del Fuego, Chile. Our aim is to understand the geomorphology, stratigraphy, formation processes and pedogenesis in relation to the human occupation for the last ~3000 years. For this porpoise, we integrate geomorphology, soil micromorphology, mineralogical analysis, geochemical data and magnetic susceptibility data, as well as the micro- and macro-frequency distribution of the archaeological material. Through all these lines of evidence we discuss three moments in the interplay between geomorphology, soil development and human occupation.
    [Show full text]
  • Taxonomicphytoge41enge.Pdf
    UNIVERSITY OF ILLINOIS LIBRARY AT URBANA CHAMPAIGN BIOLOGY JUL 1 1 1989 Published by Field Museum of Natural History Volume 41 A Taxonomic and Phytogeographic Study of Brunswick Peninsula (Strait of Magellan) Hepaticae and Anthocerotae JOHNJ. ENGEL ADD HliV December 29, 1978 FIELDIANA: BOTANY A Continuation of the BOTANICAL SERIES of FIELD MUSEUM OF NATURAL HISTORY VOLUME 41 FIELD MUSEUM OF NATURAL HISTORY CHICAGO, U.S.A. A Taxonomic and Phytogeographic Study of Brunswick Peninsula (Strait of Magellan) Hepaticae and Anthocerotae JJE FRONTISPIECE. Adelanthus tenuis Engel & Grolle. FIELDIANA Botany Published by Field Museum of Natural History Volume 41 A Taxonomic and Phytogeographic Study of Brunswick Peninsula (Strait of Magellan) Hepaticae and Anthocerotae JOHN J. ENGEL Donald Richards Associate Curator of Bryology Department of Botany Field Museum ofNatural History December 29, 1978 Publication 1291 Library of Congress Catalog Card No.: 77-20521 ISSN 0015-0746 PRINTED IN THE UNITED STATES OF AMERICA TABLE OF CONTENTS Page Acknowledgements vii I. The Brunswick Peninsula 1 A. Introductory remarks 1 B. Climate 1 II. Collectors of Hepaticae and Anthocerotae 7 A. Gazetteer of Brunswick Peninsula localities 7 B. Excluded collectors of Brunswick Peninsula Hepaticae 8 C. Personal collection localities and numbers 10 in. Vegetation of the peninsula 12 IV. Phytogeography 16 A. The phytogeographic categories 16 I. Temperate 17 A. American Temperate 17 1. Endemic to Brunswick Peninsula 17 2. Falkland-Brunswick Peninsula 18 3. Fuegian-Brunswick Peninsula 18 4. Magellanian-Brunswick Peninsula 21 5. Valdivian-Brunswick Peninsula 21 6. Valdivian + Magellanian + Brunswick Peninsula 23 7. Andean-Brunswick Peninsula 31 B. Extra-American Temperate 33 1.
    [Show full text]