DOCSLIB.ORG

This Work Is Licensed Under the Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
This Work Is Licensed Under the Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License This work is licensed under the Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/us/ or send a letter to Creative Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA. THE PREDACEOUS WATER BEETLES (COLEOPTERA: DYTISCIDAE) OF ALBERTA: SYSTEMATICS, NATURAL HISTORY AND DISTRIBUTION DA VID J. LARSON Department of Biology University of Calgary Quaestiones Entomologicae Calgary, Alberta 11: 245 - 498 1975 One hundred and forty five species belonging to 17 genera of the family Dytiscidae are recorded from Alberta. Adults of each species are described and keys for identification are presented. Six species are described as new: Hydroporus criniticoxis, Hydroporus carri, Hydroporus hockingi, Hydroporus rubyi, Agabus margareti and Acilius athabascae. The species Hygrotus picatus (Kirby) is recognized as valid, and the name Dytiscus alaskanus J. Balfour- Browne is revalidated. The following new synonymy is proposed: Hydroporus coloradensis Fall = H. griseostriatus (DeGeer); Hydroporus hortense Hatch = H. laevis Kirby; Hydroporus productotruncatus Hatch = H. alaskanus Fall; Rhantus aequalis Hatch = R. binotatus (Harris); Dytiscus ooligbukii Kirby = D. circumcinctus Ahrens; and Dytiscus vexatus Sharp = D. dauricus Gebler. For each species, the following information is presented: synonymy, selected literature ref­ erences, description, taxonomic notes, natural history notes, and distribution, which includes a brief outline of the species range and a map showing Alberta collection localities. Illustrations of taxonomically important characters are presented. The post-glacial distribution of the Alberta species is discussed and related to post-glacial vegetational movements and climatic change. The sources of most elements of the Alberta dytiscid fauna cannot be determined definitely but it is shown that the fauna is of diverse origin. A Prairie, Boreal and Cordilleran fauna comprise the Alberta fauna. Each component is of complex origin and is defined on the basis of similarities in range ends of its constituent species rather than actual associations of species forming discrete faunal units. The areas of the province with richest faunas are those of a transitional nature. Les coleopteres dytiscides en Alberta comprennent cent-quarante-cinq espec?s distributes en 17 genres. Chaque espece est decrite et nous presentons une clef pour leur identification. Nous avons decrit six especes nouvelles: Hydroporus criniticoxis, Hydroporus carri, Hydroporus hockingi, Hydroporus rubyi, Agabus margareti et Acilius athabascae. L'espece Hygrotus picatus (Kirby) est valide, et le nom Dytiscus alaskanus/. Balfour-Brown est de nouveau valide. Nous avons propose la nouvelle synonymie suivante: Hydroporus coloradensis Fall = H. griseostriatus (DeGeer); Hydroporus hortense Hatch = H. laevis Kirby; Hydroporus productopunctatus Hatch = H. alaskanus Fall; Rhantus aequalis Hatch = R. binotatus (Harris); Dytiscus ooligbukii Kirby = D. circumcinctus Ahrens; et Dytiscus vexatus Sharp = D. dauricus Gebler. Nous avons Vinformation suivante pour chaque espece: la synonymie, les references choisies, la description, les notes taxonomiques, les notes sur I'histoire naturelle et la distribution qui indue en court sommaire de la distribution de l'espece et une carte montrant les localitees de collection en Alberta. Nous avons illustre les caracteres taxonomiques importants. Nous avons discute la distribution post-glaciere des espece albertaines en relation aux mouve- ments post-glaciere de la vegetation et du changement climatique. L 'origine de la plupart des dytiscides albertains ne peut pas etre determinee definitivement, mats nous avons demontre leur origine diverse. La faune se compose d'elements des prairies, des regions boreales et des rocheuses. Chaque groupe est d'origine complexe et nous les avons definis en fonction de similarites dans la terminaison de la distribution de leurs especes constituantes plutot que par * Present address: Saskatchewan Fisheries Laboratory, 30 Campus Drive, Saskatoon, Sask. S7N 0X1. 246 Larson Vactuelle association des especes formants des unites faunales discretes. Les regions de la province les plus riches se rencontrent dans les regions de transition. TABLE OF CONTENTS Introduction 246 Study Area 246 A Brief History of Systematic Study of North American Dytiscidae 247 Material 248 r Methods 249 Systematics 254 Key to Adults of Genera of Alberta Dytiscidae 257 Subfamily Laccophilinae 258 Subfamily Hydroporinae 261 Subfamily Colymbetinae 327 Subfamily Dytiscinae 394 INTRODUCTION This survey of the dytiscid beetle fauna of the province of Alberta deals with systematics, distribution and very briefly, habitat preferences of the species. In spite of statements in the literature such as Arnett's (1963) that "As a group, the species (of the family Dytiscidae) are well known", many taxonomic problems require study. The higher taxa in the family are well defined, but within the larger genera such as Hydroporus and Agabus, the arrangement of species in supraspecific categories is unsettled. Many genera and species groups require revision. Certain species are well known and well defined. However, many instances of inter- and intrapopulation variation, sexual di- or polymorphisms, and occurrence of groups of morphologically very similar species, have been observed. I point out such areas of taxonomic complexity. The Alberta distribution of each species is described as fully as possible. Certain areas of the province have been collected extensively. However, large and zoogeographically important areas such as much of the northern portion of the province, the parkland belt of east-central Alberta, and the northern Rocky Mountains in and adjacent to Jasper National Park, have been collected only superficially. Extensive collecting in these areas may lead to the discovery of new provincial records, and will at least modify certain of the distribution patterns outlined in this study. Attempts have been made to explain the post-glacial distribution of the present fauna by consideration of present-day distribution patterns. Natural history data consist of brief descriptions of the habitat in which adult specimens of each species are most frequently found. The time of year at which teneral adults are found is listed for each species, as this gives some idea of the seasonal timing of the life history. Im­ mature stages have not been considered in this study. Much work remains to be done in terms of relating larvae to adults, description of life histories, and detailed ecological studies of species. In addition to their inherent biological interest, studies of these insects could appraise their role as predators on economically important insects such as mosquitos, and as indicators of environmental conditions. THE STUDY AREA The limits of the study area are the political boundaries of Alberta. This large area includes Dy tiscidae of Alberta 247 a varied range of geological, climatic and vegetational zones. Physical and biotic features of the province are described in Hardy (1967) and R. D. Bird (1961), Moss (1947, 1953, 1955) and Rowe (1959) describe major vegetational features. Probably, no species of dytiscid beetle is restricted to Alberta. Most species occurring in Alberta range extensively in central, western or northern Canada. By including all species known from neighbouring Canadian areas in at least the keys, it is hoped that this work will be useful for identification of dytiscids of southeastern British Columbia, the Prairie Provinces and the southern reaches of the Northwest Territories. A BRIEF HISTORY OF SYSTEMATIC STUDY OF NORTH AMERICAN DYTISCIDAE The early history of taxonomic work on the North American dytiscid fauna closely parallels that on the North American carabid fauna as outlined by Lindroth (1969). Many temperate and arctic species of Dytiscidae are Holarctic and hence a number were described by early European workers. North American populations of many of these Holarctic species were de­ scribed as separate species and even to this date, the relationships between certain morpholog­ ically similar forms in the Palaearctic and Nearctic regions have not been determined. W. Kirby (1837) and C. Aube (1838) were the first Europeans to describe large numbers of North American species. Kirby's types of North American Dytiscidae, housed in the British Museum of Natural History, London, were examined in the course of this study. Most of Aube's types, located in the Royal Museum of Natural Sciences, Brussels, Belgium, were not revised by North American workers. T. Say, in papers between 1823 and 1834, was the first North American to describe many water beetles. Say's types are considered to be lost, but recent authors have generally accepted interpretations as indicated by specimens in the LeConte collection in the Museum of Comparative Zoology, Harvard University. T. W. Harris (1828, 1829) described several species of Dytiscidae from the eastern United States. Harris' types are also located in the Museum of Comparative Zoology. During the mid 1800's, J. L. LeConte, in a series of papers (1845 - 1878), described a very large number of dytiscid beetle species,presented catalogue listings, and revised several of the larger genera. G. R. Crotch (1873) revised the North American members of the family and described a number of new species, but the descriptions are generally too brief to allow reliable
Load more

Recommended publications
  • Green-Tree Retention and Controlled Burning in Restoration and Conservation of Beetle Diversity in Boreal Forests
    Dissertationes Forestales 21 Green-tree retention and controlled burning in restoration and conservation of beetle diversity in boreal forests Esko Hyvärinen Faculty of Forestry University of Joensuu Academic dissertation To be presented, with the permission of the Faculty of Forestry of the University of Joensuu, for public criticism in auditorium C2 of the University of Joensuu, Yliopistonkatu 4, Joensuu, on 9th June 2006, at 12 o’clock noon. 2 Title: Green-tree retention and controlled burning in restoration and conservation of beetle diversity in boreal forests Author: Esko Hyvärinen Dissertationes Forestales 21 Supervisors: Prof. Jari Kouki, Faculty of Forestry, University of Joensuu, Finland Docent Petri Martikainen, Faculty of Forestry, University of Joensuu, Finland Pre-examiners: Docent Jyrki Muona, Finnish Museum of Natural History, Zoological Museum, University of Helsinki, Helsinki, Finland Docent Tomas Roslin, Department of Biological and Environmental Sciences, Division of Population Biology, University of Helsinki, Helsinki, Finland Opponent: Prof. Bengt Gunnar Jonsson, Department of Natural Sciences, Mid Sweden University, Sundsvall, Sweden ISSN 1795-7389 ISBN-13: 978-951-651-130-9 (PDF) ISBN-10: 951-651-130-9 (PDF) Paper copy printed: Joensuun yliopistopaino, 2006 Publishers: The Finnish Society of Forest Science Finnish Forest Research Institute Faculty of Agriculture and Forestry of the University of Helsinki Faculty of Forestry of the University of Joensuu Editorial Office: The Finnish Society of Forest Science Unioninkatu 40A, 00170 Helsinki, Finland http://www.metla.fi/dissertationes 3 Hyvärinen, Esko 2006. Green-tree retention and controlled burning in restoration and conservation of beetle diversity in boreal forests. University of Joensuu, Faculty of Forestry. ABSTRACT The main aim of this thesis was to demonstrate the effects of green-tree retention and controlled burning on beetles (Coleoptera) in order to provide information applicable to the restoration and conservation of beetle species diversity in boreal forests.
    [Show full text]
  • Water Beetles
    Ireland Red List No. 1 Water beetles Ireland Red List No. 1: Water beetles G.N. Foster1, B.H. Nelson2 & Á. O Connor3 1 3 Eglinton Terrace, Ayr KA7 1JJ 2 Department of Natural Sciences, National Museums Northern Ireland 3 National Parks & Wildlife Service, Department of Environment, Heritage & Local Government Citation: Foster, G. N., Nelson, B. H. & O Connor, Á. (2009) Ireland Red List No. 1 – Water beetles. National Parks and Wildlife Service, Department of Environment, Heritage and Local Government, Dublin, Ireland. Cover images from top: Dryops similaris (© Roy Anderson); Gyrinus urinator, Hygrotus decoratus, Berosus signaticollis & Platambus maculatus (all © Jonty Denton) Ireland Red List Series Editors: N. Kingston & F. Marnell © National Parks and Wildlife Service 2009 ISSN 2009‐2016 Red list of Irish Water beetles 2009 ____________________________ CONTENTS ACKNOWLEDGEMENTS .................................................................................................................................... 1 EXECUTIVE SUMMARY...................................................................................................................................... 2 INTRODUCTION................................................................................................................................................ 3 NOMENCLATURE AND THE IRISH CHECKLIST................................................................................................ 3 COVERAGE .......................................................................................................................................................
    [Show full text]
  • Wild Species 2010 the GENERAL STATUS of SPECIES in CANADA
    Wild Species 2010 THE GENERAL STATUS OF SPECIES IN CANADA Canadian Endangered Species Conservation Council National General Status Working Group This report is a product from the collaboration of all provincial and territorial governments in Canada, and of the federal government. Canadian Endangered Species Conservation Council (CESCC). 2011. Wild Species 2010: The General Status of Species in Canada. National General Status Working Group: 302 pp. Available in French under title: Espèces sauvages 2010: La situation générale des espèces au Canada. ii Abstract Wild Species 2010 is the third report of the series after 2000 and 2005. The aim of the Wild Species series is to provide an overview on which species occur in Canada, in which provinces, territories or ocean regions they occur, and what is their status. Each species assessed in this report received a rank among the following categories: Extinct (0.2), Extirpated (0.1), At Risk (1), May Be At Risk (2), Sensitive (3), Secure (4), Undetermined (5), Not Assessed (6), Exotic (7) or Accidental (8). In the 2010 report, 11 950 species were assessed. Many taxonomic groups that were first assessed in the previous Wild Species reports were reassessed, such as vascular plants, freshwater mussels, odonates, butterflies, crayfishes, amphibians, reptiles, birds and mammals. Other taxonomic groups are assessed for the first time in the Wild Species 2010 report, namely lichens, mosses, spiders, predaceous diving beetles, ground beetles (including the reassessment of tiger beetles), lady beetles, bumblebees, black flies, horse flies, mosquitoes, and some selected macromoths. The overall results of this report show that the majority of Canada’s wild species are ranked Secure.
    [Show full text]
  • Inventory of Aquatic and Semiaquatic Coleoptera from the Grand Portage Indian Reservation, Cook County, Minnesota
    The Great Lakes Entomologist Volume 46 Numbers 1 & 2 - Spring/Summer 2013 Numbers Article 7 1 & 2 - Spring/Summer 2013 April 2013 Inventory of Aquatic and Semiaquatic Coleoptera from the Grand Portage Indian Reservation, Cook County, Minnesota David B. MacLean Youngstown State University Follow this and additional works at: https://scholar.valpo.edu/tgle Part of the Entomology Commons Recommended Citation MacLean, David B. 2013. "Inventory of Aquatic and Semiaquatic Coleoptera from the Grand Portage Indian Reservation, Cook County, Minnesota," The Great Lakes Entomologist, vol 46 (1) Available at: https://scholar.valpo.edu/tgle/vol46/iss1/7 This Peer-Review Article is brought to you for free and open access by the Department of Biology at ValpoScholar. It has been accepted for inclusion in The Great Lakes Entomologist by an authorized administrator of ValpoScholar. For more information, please contact a ValpoScholar staff member at [email protected]. MacLean: Inventory of Aquatic and Semiaquatic Coleoptera from the Grand Po 104 THE GREAT LAKES ENTOMOLOGIST Vol. 46, Nos. 1 - 2 Inventory of Aquatic and Semiaquatic Coleoptera from the Grand Portage Indian Reservation, Cook County, Minnesota David B. MacLean1 Abstract Collections of aquatic invertebrates from the Grand Portage Indian Res- ervation (Cook County, Minnesota) during 2001 – 2012 resulted in 9 families, 43 genera and 112 species of aquatic and semiaquatic Coleoptera. The Dytisci- dae had the most species (53), followed by Hydrophilidae (20), Gyrinidae (14), Haliplidae (8), Chrysomelidae (7), Elmidae (3) and Curculionidae (5). The families Helodidae and Heteroceridae were each represented by a single spe- cies. Seventy seven percent of species were considered rare or uncommon (1 - 10 records), twenty percent common (11 - 100 records) and only three percent abundant (more than 100 records).
    [Show full text]
  • Lessons from Genome Skimming of Arthropod-Preserving Ethanol Benjamin Linard, P
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Archive Ouverte en Sciences de l'Information et de la Communication Lessons from genome skimming of arthropod-preserving ethanol Benjamin Linard, P. Arribas, C. Andújar, A. Crampton-Platt, A. P. Vogler To cite this version: Benjamin Linard, P. Arribas, C. Andújar, A. Crampton-Platt, A. P. Vogler. Lessons from genome skimming of arthropod-preserving ethanol. Molecular Ecology Resources, Wiley/Blackwell, 2016, 16 (6), pp.1365-1377. 10.1111/1755-0998.12539. hal-01636888 HAL Id: hal-01636888 https://hal.archives-ouvertes.fr/hal-01636888 Submitted on 17 Jan 2019 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. 1 Lessons from genome skimming of arthropod-preserving 2 ethanol 3 Linard B.*1,4, Arribas P.*1,2,5, Andújar C.1,2, Crampton-Platt A.1,3, Vogler A.P. 1,2 4 5 1 Department of Life Sciences, Natural History Museum, Cromwell Road, London SW7 6 5BD, UK, 7 2 Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot 8 SL5 7PY, UK, 9 3 Department
    [Show full text]
  • Coleoptera: Dytiscidae) Rasa Bukontaite1,2*, Kelly B Miller3 and Johannes Bergsten1
    Bukontaite et al. BMC Evolutionary Biology 2014, 14:5 http://www.biomedcentral.com/1471-2148/14/5 RESEARCH ARTICLE Open Access The utility of CAD in recovering Gondwanan vicariance events and the evolutionary history of Aciliini (Coleoptera: Dytiscidae) Rasa Bukontaite1,2*, Kelly B Miller3 and Johannes Bergsten1 Abstract Background: Aciliini presently includes 69 species of medium-sized water beetles distributed on all continents except Antarctica. The pattern of distribution with several genera confined to different continents of the Southern Hemisphere raises the yet untested hypothesis of a Gondwana vicariance origin. The monophyly of Aciliini has been questioned with regard to Eretini, and there are competing hypotheses about the intergeneric relationship in the tribe. This study is the first comprehensive phylogenetic analysis focused on the tribe Aciliini and it is based on eight gene fragments. The aims of the present study are: 1) to test the monophyly of Aciliini and clarify the position of the tribe Eretini and to resolve the relationship among genera within Aciliini, 2) to calibrate the divergence times within Aciliini and test different biogeographical scenarios, and 3) to evaluate the utility of the gene CAD for phylogenetic analysis in Dytiscidae. Results: Our analyses confirm monophyly of Aciliini with Eretini as its sister group. Each of six genera which have multiple species are also supported as monophyletic. The origin of the tribe is firmly based in the Southern Hemisphere with the arrangement of Neotropical and Afrotropical taxa as the most basal clades suggesting a Gondwana vicariance origin. However, the uncertainty as to whether a fossil can be used as a stem-or crowngroup calibration point for Acilius influenced the result: as crowngroup calibration, the 95% HPD interval for the basal nodes included the geological age estimate for the Gondwana break-up, but as a stem group calibration the basal nodes were too young.
    [Show full text]
  • Hundreds of Species of Aquatic Macroinvertebrates Live in Illinois In
    Illinois A B aquatic sowbug Asellus sp. Photograph © Paul P.Tinerella AAqquuaattiicc mayfly A. adult Hexagenia sp.; B. nymph Isonychia sp. MMaaccrrooiinnvveerrtteebbrraatteess Photographs © Michael R. Jeffords northern clearwater crayfish Orconectes propinquus Photograph © Michael R. Jeffords ruby spot damselfly Hetaerina americana Photograph © Michael R. Jeffords aquatic snail Pleurocera acutum Photograph © Jochen Gerber,The Field Museum of Natural History predaceous diving beetle Dytiscus circumcinctus Photograph © Paul P.Tinerella monkeyface mussel Quadrula metanevra common skimmer dragonfly - nymph Libellula sp. Photograph © Kevin S. Cummings Photograph © Paul P.Tinerella water scavenger beetle Hydrochara sp. Photograph © Steve J.Taylor devil crayfish Cambarus diogenes A B Photograph © ChristopherTaylor dobsonfly Corydalus sp. A. larva; B. adult Photographs © Michael R. Jeffords common darner dragonfly - nymph Aeshna sp. Photograph © Paul P.Tinerella giant water bug Belostoma lutarium Photograph © Paul P.Tinerella aquatic worm Slavina appendiculata Photograph © Mark J. Wetzel water boatman Trichocorixa calva Photograph © Paul P.Tinerella aquatic mite Order Prostigmata Photograph © Michael R. Jeffords backswimmer Notonecta irrorata Photograph © Paul P.Tinerella leech - adult and young Class Hirudinea pygmy backswimmer Neoplea striola mosquito - larva Toxorhynchites sp. fishing spider Dolomedes sp. Photograph © William N. Roston Photograph © Paul P.Tinerella Photograph © Michael R. Jeffords Photograph © Paul P.Tinerella Species List Species are not shown in proportion to actual size. undreds of species of aquatic macroinvertebrates live in Illinois in a Kingdom Animalia Hvariety of habitats. Some of the habitats have flowing water while Phylum Annelida Class Clitellata Family Naididae aquatic worm Slavina appendiculata This poster was made possible by: others contain still water. In order to survive in water, these organisms Class Hirudinea leech must be able to breathe, find food, protect themselves, move and reproduce.
    [Show full text]
  • Dytiscid Water Beetles (Coleoptera: Dytiscidae) of the Yukon
    Dytiscid water beetles of the Yukon FRONTISPIECE. Neoscutopterus horni (Crotch), a large, black species of dytiscid beetle that is common in sphagnum bog pools throughout the Yukon Territory. 491 Dytiscid Water Beetles (Coleoptera: Dytiscidae) of the Yukon DAVID J. LARSON Department of Biology, Memorial University of Newfoundland St. John’s, Newfoundland, Canada A1B 3X9 Abstract. One hundred and thirteen species of Dytiscidae (Coleoptera) are recorded from the Yukon Territory. The Yukon distribution, total geographical range and habitat of each of these species is described and multi-species patterns are summarized in tabular form. Several different range patterns are recognized with most species being Holarctic or transcontinental Nearctic boreal (73%) in lentic habitats. Other major range patterns are Arctic (20 species) and Cordilleran (12 species), while a few species are considered to have Grassland (7), Deciduous forest (2) or Southern (5) distributions. Sixteen species have a Beringian and glaciated western Nearctic distribution, i.e. the only Nearctic Wisconsinan refugial area encompassed by their present range is the Alaskan/Central Yukon refugium; 5 of these species are closely confined to this area while 11 have wide ranges that extend in the arctic and/or boreal zones east to Hudson Bay. Résumé. Les dytiques (Coleoptera: Dytiscidae) du Yukon. Cent treize espèces de dytiques (Coleoptera: Dytiscidae) sont connues au Yukon. Leur répartition au Yukon, leur répartition globale et leur habitat sont décrits et un tableau résume les regroupements d’espèces. La répartition permet de reconnaître plusieurs éléments: la majorité des espèces sont holarctiques ou transcontinentales-néarctiques-boréales (73%) dans des habitats lénitiques. Vingt espèces sont arctiques, 12 sont cordillériennes, alors qu’un petit nombre sont de la prairie herbeuse (7), ou de la forêt décidue (2), ou sont australes (5).
    [Show full text]
  • ~XECKDING PAGE BLANK WT FIL,,Q
    1,. ,-- ,-- ~XECKDING PAGE BLANK WT FIL,,q DYNAMICAL EVIDENCE REGARDING THE RELATIONSHIP BETWEEN ASTEROIDS AND METEORITES GEORGE W. WETHERILL Department of Temcltricrl kgnetism ~amregie~mtittition of Washington Washington, D. C. 20025 Meteorites are fragments of small solar system bodies (comets, asteroids and Apollo objects). Therefore they may be expected to provide valuable information regarding these bodies. How- ever, the identification of particular classes of meteorites with particular small bodies or classes of small bodies is at present uncertain. It is very unlikely that any significant quantity of meteoritic material is obtained from typical ac- tive comets. Relatively we1 1-studied dynamical mechanisms exist for transferring material into the vicinity of the Earth from the inner edge of the asteroid belt on an 210~-~year time scale. It seems likely that most iron meteorites are obtained in this way, and a significant yield of complementary differec- tiated meteoritic silicate material may be expected to accom- pany these differentiated iron meteorites. Insofar as data exist, photometric measurements support an association between Apollo objects and chondri tic meteorites. Because Apol lo ob- jects are in orbits which come close to the Earth, and also must be fragmented as they traverse the asteroid belt near aphel ion, there also must be a component of the meteorite flux derived from Apollo objects. Dynamical arguments favor the hypothesis that most Apollo objects are devolatilized comet resiaues. However, plausible dynamical , petrographic, and cosmogonical reasons are known which argue against the simple conclusion of this syllogism, uiz., that chondri tes are of cometary origin. Suggestions are given for future theoretical , observational, experimental investigations directed toward improving our understanding of this puzzling situation.
    [Show full text]
  • IV Trobada D'estudiosos De La Serralada Litoral Central I VIII Del
    Sèrie Territori i Parcs Naturals 7 IV Trobada d’Estudiosos de la Serralada Litoral Central i VIII del Montnegre i el Corredor Col·lecció Eines Sèrie Territori i Parcs Naturals El 20 i 21 de novembre de 2019 va tenir lloc a Vallgorguina la IV Trobada d’Estudiosos de la Serralada Litoral Central i VIII del Montnegre i el Corredor, amb l’objectiu de donar a conèixer els estudis i recerques duts a terme els últims quatre anys en diferents àmbits de les ciències socials i naturals del territori. En total es van presentar 47 comunicacions que van abordar temes rellevants i innovadors, però també estudis de base o projectes de gestió aplicada per a la conservació d’espècies o per al control d’espècies exòtiques, entre d’altres. Aquests treballs, que amb aquesta publicació tenim l’oportunitat de llegir amb detall, suposen una contribució inestimable per millorar el coneixement de la realitat d’aquests tres parcs, dels seus valors naturals, paisatgístics i culturals, i són de gran utilitat per al personal encarregat de gestionar-los i per a qualsevol persona interessada en la seva conservació. Col·lecció Eines Sèrie Territori i Parcs Naturals 7 IV Trobada d’Estudiosos de la Serralada Litoral Central i VIII del Montnegre i el Corredor Vallgorguina, 20 i 21 de novembre de 2019 Col·lecció Eines Primera edició: desembre de 2020 © dels textos: els seus autors © de l’edició: Diputació de Barcelona Coordinació: Gerència de Serveis d’Espais Naturals de la Diputació de Barcelona Producció: Gabinet de Premsa i Comunicació de la Diputació de Barcelona Composició:
    [Show full text]
  • Aqueous Alteration on Main Belt Primitive Asteroids: Results from Visible Spectroscopy1
    Aqueous alteration on main belt primitive asteroids: results from visible spectroscopy1 S. Fornasier1,2, C. Lantz1,2, M.A. Barucci1, M. Lazzarin3 1 LESIA, Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris Diderot, 5 Place J. Janssen, 92195 Meudon Pricipal Cedex, France 2 Univ. Paris Diderot, Sorbonne Paris Cit´e, 4 rue Elsa Morante, 75205 Paris Cedex 13 3 Department of Physics and Astronomy of the University of Padova, Via Marzolo 8 35131 Padova, Italy Submitted to Icarus: November 2013, accepted on 28 January 2014 e-mail: [email protected]; fax: +33145077144; phone: +33145077746 Manuscript pages: 38; Figures: 13 ; Tables: 5 Running head: Aqueous alteration on primitive asteroids Send correspondence to: Sonia Fornasier LESIA-Observatoire de Paris arXiv:1402.0175v1 [astro-ph.EP] 2 Feb 2014 Batiment 17 5, Place Jules Janssen 92195 Meudon Cedex France e-mail: [email protected] 1Based on observations carried out at the European Southern Observatory (ESO), La Silla, Chile, ESO proposals 062.S-0173 and 064.S-0205 (PI M. Lazzarin) Preprint submitted to Elsevier September 27, 2018 fax: +33145077144 phone: +33145077746 2 Aqueous alteration on main belt primitive asteroids: results from visible spectroscopy1 S. Fornasier1,2, C. Lantz1,2, M.A. Barucci1, M. Lazzarin3 Abstract This work focuses on the study of the aqueous alteration process which acted in the main belt and produced hydrated minerals on the altered asteroids. Hydrated minerals have been found mainly on Mars surface, on main belt primitive asteroids and possibly also on few TNOs. These materials have been produced by hydration of pristine anhydrous silicates during the aqueous alteration process, that, to be active, needed the presence of liquid water under low temperature conditions (below 320 K) to chemically alter the minerals.
    [Show full text]
  • PROCEEDINGS of the OKLAHOMA ACADEMY of SCIENCE Volume 98 2018
    PROCEEDINGS of the OKLAHOMA ACADEMY OF SCIENCE Volume 98 2018 EDITOR: Mostafa Elshahed Production Editor: Tammy Austin Business Manager: T. David Bass The Official Organ of the OKLAHOMA ACADEMY OF SCIENCE Which was established in 1909 for the purpose of stimulating scientific research; to promote fraternal relationships among those engaged in scientific work in Oklahoma; to diffuse among the citizens of the State a knowledge of the various departments of science; and to investigate and make known the material, educational, and other resources of the State. Affiliated with the American Association for the Advancement of Science. Publication Date: January 2019 ii POLICIES OF THE PROCEEDINGS The Proceedings of the Oklahoma Academy of Science contains papers on topics of interest to scientists. The goal is to publish clear communications of scientific findings and of matters of general concern for scientists in Oklahoma, and to serve as a creative outlet for other scientific contributions by scientists. ©2018 Oklahoma Academy of Science The Proceedings of the Oklahoma Academy Base and/or other appropriate repository. of Science contains reports that describe the Information necessary for retrieval of the results of original scientific investigation data from the repository will be specified in (including social science). Papers are received a reference in the paper. with the understanding that they have not been published previously or submitted for 4. Manuscripts that report research involving publication elsewhere. The papers should be human subjects or the use of materials of significant scientific quality, intelligible to a from human organs must be supported by broad scientific audience, and should represent a copy of the document authorizing the research conducted in accordance with accepted research and signed by the appropriate procedures and scientific ethics (proper subject official(s) of the institution where the work treatment and honesty).
    [Show full text]