DOCSLIB.ORG

Corresponding Author

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Corresponding Author MIAMI UNIVERSITY The Graduate School Certificate for Approving the Dissertation We hereby approve the Dissertation of Zachary St. John Taylor Candidate for the Degree: Doctor of Philosophy _____________________________________ Susan M.G. Hoffman, Director _____________________________________ David J. Berg, Reader _____________________________________ Brian Keane, Reader _____________________________________ Douglas B. Meikle _____________________________________ Emily S. Murphree Graduate School Representative ABSTRACT GEOGRAPHICAL HETEROGENEITY AND LANDSCAPE-SCALE GENETIC PATTERNS IN GREAT LAKES POPULATIONS OF PEROMYSCUS Zachary S. Taylor Woodland mice of the genus Peromyscus are broadly distributed throughout North America, where they interact with a wide variety of landscape features, climates, and biological communities. Each of the central chapters of this dissertation examines genetic heterogeneity in a species of Peromyscus in relation to landscape features of the Great Lakes region, in order to illuminate the biogeographical constraints facing small mammals in this region. Chapter 1, General introduction Chapter 2, MtDNA genetic structure transcends natural boundaries in Great Lakes populations of deer mice (Peromyscus maniculatus gracilis), examines the genetic structure of deer mice to describe the effect of the Great Lakes on the colonization of northern Michigan from southern refugial sources after the end of the last glacial cycle. Analyses reveal a complex structure indicating occasional migration across Lake Michigan during the 10,000-year history of mouse habitation in the region. Chapter 3, Landscape fragmentation and geographical isolation define microsatellite genetic structure in Great Lakes populations of deer mice (Peromyscus maniculatus gracilis), describes the genetic structure of deer mice using nuclear microsatellite markers. In contrast to Chapter 2, which examines the Great Lakes as barriers to postglacial colonization, Chapter 3 considers the role of the lakes in promoting the differentiation of populations through genetic drift, after expansion from a common source. Chapter 4, Landscape-scale fragmentation and genetic structure in populations of the northern white-footed mouse (Peromyscus leucopus noveboracensis), describes the genetic structure of white-footed mice along a transect from southern Ohio to northern Michigan. Because this transect covers a heterogeneous landscape and climatic gradient, habitat fragmentation and biogeographical range limitation are considered as possible determinants of genetic patterns. Chapter 5, Conclusion GEOGRAPHICAL HETEROGENEITY AND LANDSCAPE-SCALE GENETIC PATTERNS IN GREAT LAKES POPULATIONS OF PEROMYSCUS A DISSERTATION Submitted to the Faculty of Miami University in partial fulfillment of the requirements for the degree of Doctor of Philosophy Zoology by Zachary S. Taylor Miami University Oxford, Ohio 2010 Dissertation Director: Susan M.G. Hoffman © Zachary S. Taylor 2010 Table of Contents List of Tables ................................................................................................................. iv List of Figures ................................................................................................................. v CHAPTER 1 General Introduction .............................................................................. 1 Overview ......................................................................................................................... 1 Background ..................................................................................................................... 2 References ....................................................................................................................... 8 CHAPTER 2 MtDNA genetic structure transcends natural boundaries in Great Lakes populations of deer mice (Peromyscus maniculatus gracilis) ........................... 12 Introduction ................................................................................................................... 13 Materials and methods .................................................................................................. 15 Results ........................................................................................................................... 21 Discussion ..................................................................................................................... 23 Acknowledgements ....................................................................................................... 27 References ..................................................................................................................... 28 For 2 groups, with eastern populations only ............................................................. 35 CHAPTER 3 Natural landscape fragmentation defines microsatellite genetic structure in Great Lakes populations of deer mice (Peromyscus maniculatus gracilis) ........................................................................................................................................... 42 CHAPTER 4 Landscape-scale fragmentation and genetic structure in populations of the northern white-footed mouse (Peromyscus leucopus noveboracensis) ............. 68 Abstract ......................................................................................................................... 68 Introduction ................................................................................................................... 69 Materials and Methods .................................................................................................. 71 Results ........................................................................................................................... 74 Discussion ..................................................................................................................... 76 Acknowledgments ........................................................................................................ 79 References ..................................................................................................................... 80 CHAPTER 5. Conclusion .............................................................................................. 95 References ................................................................................................................... 101 iii List of Tables Chapter 2 Table 1. Differentiation of populations and population divisions in Great Lakes Peromyscus maniculatus 33 Table 2. Differentiation of populations and population divisions in Great Lakes Peromyscus maniculatus 34 Chapter 3 Table 1. Microsatellite loci selected for analysis 61 Table 2. Molecular diversity indexes for populations of Peromyscus maniculatus 62 Chapter 4 Table 1. Microsatellite loci selected for analysis 85 Table 2. Standard molecular diversity indexes for populations of Peromyscus leucopus 86 iv List of Figures Chapter 2 Figure 1. Distribution of Peromyscus maniculatus gracilis haplogroups in the central Great Lakes region 35 Figure 2. Bayesian haplotype tree for Great Lakes Peromyscus maniculatus gracilis and related groups 36 Figure 3. Parsimony network for Great Lakes and North Carolina Peromyscus maniculatus 37 Mismatch analysis of Peromyscus maniculatus samples 38 Chapter 3 Figure 1. Trapping locations for Peromyscus maniculatus gracilis in the Great Lakes region 63 Figure 2. Spatial distribution of genetic structure for Peromyscus maniculatus gracilis 64 Figure 3. Clustering of Michigan populations of Peromyscus maniculatus gracilis by STRUCTURE 65 Chapter 4 Figure 1. Study area and trapping sites for Peromyscus leucopus 87 Figure 2. Habitat availability and genetic diversity for Peromyscus leucopus 88 Figure 3. Inter-population differentiation populations of Peromyscus leucopus 89 Figure 4. Clustering analyses using STRUCTURE 90 v Dedication To Victoria, Stella, June, and my parents, for your endless patience and support. vi Acknowledgements I am indebted to my advisor, Susan Hoffman, for the opportunity to find my way through these exciting projects; and to David Berg, Brian Keane, Douglas Meikle, and Emily Murphree, for their help and patience. I could not have completed this dissertation without assistance from a large number of individuals and institutions, including Phil Myers, Rosa Moscarella, and Robbyn Abbitt, for extraordinary assistance vital to this dissertation. Many students and colleagues have contributed labor to the projects described herein, including Molly Steinwald, Cameron Beech, Justin Campbell, Brett Chatman, Darcy Dayhoff, Brian Dinh, Allison Dixon, and Kyle Westhafer. The staffs of Pigeon River State Forest, Seney National Wildlife Refuge, the Michigan State University Museum, and the University of Michigan Museum of Zoology were instrumental in sampling efforts over the years. Chris Wood, Xiaoyun Deng, and John Hawes of the Center for Bioinformatics and Functional Genomics at Miami University were always extremely knowledgeable and helpful with sequencing and genotyping. This work was completed with funding from the Department of Zoology and the Graduate School at Miami University, and from a Grant-in-Aid provided by the American Society of Mammalogists. vii CHAPTER 1 General Introduction Overview When natural or artificial barriers prevent animals from moving from one area to another, this interference can reduce the chances for long-term survival of affected populations or even species. In extreme
Load more

Recommended publications
  • The Last Maximum Ice Extent and Subsequent Deglaciation of the Pyrenees: an Overview of Recent Research
    Cuadernos de Investigación Geográfica 2015 Nº 41 (2) pp. 359-387 ISSN 0211-6820 DOI: 10.18172/cig.2708 © Universidad de La Rioja THE LAST MAXIMUM ICE EXTENT AND SUBSEQUENT DEGLACIATION OF THE PYRENEES: AN OVERVIEW OF RECENT RESEARCH M. DELMAS Université de Perpignan-Via Domitia, UMR 7194 CNRS, Histoire Naturelle de l’Homme Préhistorique, 52 avenue Paul Alduy 66860 Perpignan, France. ABSTRACT. This paper reviews data currently available on the glacial fluctuations that occurred in the Pyrenees between the Würmian Maximum Ice Extent (MIE) and the beginning of the Holocene. It puts the studies published since the end of the 19th century in a historical perspective and focuses on how the methods of investigation used by successive generations of authors led them to paleogeographic and chronologic conclusions that for a time were antagonistic and later became complementary. The inventory and mapping of the ice-marginal deposits has allowed several glacial stades to be identified, and the successive ice boundaries to be outlined. Meanwhile, the weathering grade of moraines and glaciofluvial deposits has allowed Würmian glacial deposits to be distinguished from pre-Würmian ones, and has thus allowed the Würmian Maximum Ice Extent (MIE) –i.e. the starting point of the last deglaciation– to be clearly located. During the 1980s, 14C dating of glaciolacustrine sequences began to indirectly document the timing of the glacial stades responsible for the adjacent frontal or lateral moraines. Over the last decade, in situ-produced cosmogenic nuclides (10Be and 36Cl) have been documenting the deglaciation process more directly because the data are obtained from glacial landforms or deposits such as boulders embedded in frontal or lateral moraines, or ice- polished rock surfaces.
    [Show full text]
  • Sea Level and Global Ice Volumes from the Last Glacial Maximum to the Holocene
    Sea level and global ice volumes from the Last Glacial Maximum to the Holocene Kurt Lambecka,b,1, Hélène Roubya,b, Anthony Purcella, Yiying Sunc, and Malcolm Sambridgea aResearch School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia; bLaboratoire de Géologie de l’École Normale Supérieure, UMR 8538 du CNRS, 75231 Paris, France; and cDepartment of Earth Sciences, University of Hong Kong, Hong Kong, China This contribution is part of the special series of Inaugural Articles by members of the National Academy of Sciences elected in 2009. Contributed by Kurt Lambeck, September 12, 2014 (sent for review July 1, 2014; reviewed by Edouard Bard, Jerry X. Mitrovica, and Peter U. Clark) The major cause of sea-level change during ice ages is the exchange for the Holocene for which the direct measures of past sea level are of water between ice and ocean and the planet’s dynamic response relatively abundant, for example, exhibit differences both in phase to the changing surface load. Inversion of ∼1,000 observations for and in noise characteristics between the two data [compare, for the past 35,000 y from localities far from former ice margins has example, the Holocene parts of oxygen isotope records from the provided new constraints on the fluctuation of ice volume in this Pacific (9) and from two Red Sea cores (10)]. interval. Key results are: (i) a rapid final fall in global sea level of Past sea level is measured with respect to its present position ∼40 m in <2,000 y at the onset of the glacial maximum ∼30,000 y and contains information on both land movement and changes in before present (30 ka BP); (ii) a slow fall to −134 m from 29 to 21 ka ocean volume.
    [Show full text]
  • 22 AUG 2021 Index Acadia Rock 14967
    19 SEP 2021 Index 543 Au Sable Point 14863 �� � � � � 324, 331 Belle Isle 14976 � � � � � � � � � 493 Au Sable Point 14962, 14963 �� � � � 468 Belle Isle, MI 14853, 14848 � � � � � 290 Index Au Sable River 14863 � � � � � � � 331 Belle River 14850� � � � � � � � � 301 Automated Mutual Assistance Vessel Res- Belle River 14852, 14853� � � � � � 308 cue System (AMVER)� � � � � 13 Bellevue Island 14882 �� � � � � � � 346 Automatic Identification System (AIS) Aids Bellow Island 14913 � � � � � � � 363 A to Navigation � � � � � � � � 12 Belmont Harbor 14926, 14928 � � � 407 Au Train Bay 14963 � � � � � � � � 469 Benson Landing 14784 � � � � � � 500 Acadia Rock 14967, 14968 � � � � � 491 Au Train Island 14963 � � � � � � � 469 Benton Harbor, MI 14930 � � � � � 381 Adams Point 14864, 14880 �� � � � � 336 Au Train Point 14969 � � � � � � � 469 Bete Grise Bay 14964 � � � � � � � 475 Agate Bay 14966 �� � � � � � � � � 488 Avon Point 14826� � � � � � � � � 259 Betsie Lake 14907 � � � � � � � � 368 Agate Harbor 14964� � � � � � � � 476 Betsie River 14907 � � � � � � � � 368 Agriculture, Department of� � � � 24, 536 B Biddle Point 14881 �� � � � � � � � 344 Ahnapee River 14910 � � � � � � � 423 Biddle Point 14911 �� � � � � � � � 444 Aids to navigation � � � � � � � � � 10 Big Bay 14932 �� � � � � � � � � � 379 Baby Point 14852� � � � � � � � � 306 Air Almanac � � � � � � � � � � � 533 Big Bay 14963, 14964 �� � � � � � � 471 Bad River 14863, 14867 � � � � � � 327 Alabaster, MI 14863 � � � � � � � � 330 Big Bay 14967 �� � � � � � � � � � 490 Baileys
    [Show full text]
  • State of Michigan
    MICHIGAN The Status of Lighthouses MICHIGAN’S LIGHTHOUSES November 1998 NAME S TATI O N LIGHT OTHER IMPORTANT DATES NATIONAL REGISTER COUNTY NEAREST SITING LOCATION DESCRIPTION OWNERSHIP LESSEE OPEN TO PUBLIC EST. CONST. CITY 1 Alpena Light Station 1877 1914 Determined eligible by USCG; Alpena Alpena Breakwater NE side of entrance to U.S.C.G. No SHPO concurs 2 AuSable (Big Sable) Light Station 1874 1874 1909-Addition to keeper’s house Listed 5/23/78 Alger Grand Marais Land based On AuSable Point, W U.S.C.G. Of Grand Marais 3 Beaver Island (Beaver Head) Light Station 1851 1858 1866-Keeper’s house const. Listed 12/29/78 Charlevoix St. James Land based S. Shore of Beaver Island Charlevoix P.S. 4 Beaver Island Harbor (St. James) Light Station 1852 1870 Determined eligible by USCG; Charlevoix St. James Land based N side of entrance to Beaver U.S.C.G. SHPO concurs Island Harbor 5 Bete Grise (Mendota) Light Station 1870 1895 Keweenaw Bete Grise Land based S. Side of entrance to Mendota Private No Canal 6 Big Bay Point Light Station 1896 1896 Listed 10/12/88 Marquette Big Bay Land based Big Bay Point, 24 miles Big Bay B & B Grounds (11-4) Tower NW of Marquette 1st Sunday, no Children 7 Big Sable Point (Grande Pt. AuSable) Light Station 1867 1867 1900-Tower encased in steel; 1905- Listed 8/4/83 Mason Ludington Land based Big Sable Pt. 8 miles NW U.S.C.G. Big Sable Pt. Light- watchroom encased of Ludington House Keepers Assoc.
    [Show full text]
  • Lighthouses – Clippings
    GREAT LAKES MARINE COLLECTION MILWAUKEE PUBLIC LIBRARY/WISCONSIN MARINE HISTORICAL SOCIETY MARINE SUBJECT FILES LIGHTHOUSE CLIPPINGS Current as of November 7, 2018 LIGHTHOUSE NAME – STATE - LAKE – FILE LOCATION Algoma Pierhead Light – Wisconsin – Lake Michigan - Algoma Alpena Light – Michigan – Lake Huron - Alpena Apostle Islands Lights – Wisconsin – Lake Superior - Apostle Islands Ashland Harbor Breakwater Light – Wisconsin – Lake Superior - Ashland Ashtabula Harbor Light – Ohio – Lake Erie - Ashtabula Badgeley Island – Ontario – Georgian Bay, Lake Huron – Badgeley Island Bailey’s Harbor Light – Wisconsin – Lake Michigan – Bailey’s Harbor, Door County Bailey’s Harbor Range Lights – Wisconsin – Lake Michigan – Bailey’s Harbor, Door County Bala Light – Ontario – Lake Muskoka – Muskoka Lakes Bar Point Shoal Light – Michigan – Lake Erie – Detroit River Baraga (Escanaba) (Sand Point) Light – Michigan – Lake Michigan – Sand Point Barber’s Point Light (Old) – New York – Lake Champlain – Barber’s Point Barcelona Light – New York – Lake Erie – Barcelona Lighthouse Battle Island Lightstation – Ontario – Lake Superior – Battle Island Light Beaver Head Light – Michigan – Lake Michigan – Beaver Island Beaver Island Harbor Light – Michigan – Lake Michigan – St. James (Beaver Island Harbor) Belle Isle Lighthouse – Michigan – Lake St. Clair – Belle Isle Bellevue Park Old Range Light – Michigan/Ontario – St. Mary’s River – Bellevue Park Bete Grise Light – Michigan – Lake Superior – Mendota (Bete Grise) Bete Grise Bay Light – Michigan – Lake Superior
    [Show full text]
  • Beaver-Island.Pdf
    -J Anishinaabemowin language: George Trudeau Kchi Miigwetch to additional resource language translators: Ron Wakegijig, Wikwemikong Unceded Indian Reserve Eleanore Rivers, Wikwemikong Unceded Indian Reserve Wilfred (Willy) Trudeau, Wikwemikong Unceded Indian Reserve Language of Ojibwe and Odawa dialect found on Manitoulin Island Ontario, Canada. Story excerpts from the Elders of the Grand Traverse Band of Ottawa & Chippewa Indians Drawings by Mark Russell Maps by Pauline Barber Front Cover by James McCaan English translation of tape by Pauline Barber Interviews performed by Brian Corbiere, Pauline Barber and assistance from Carrie Leaureaux & Sammie McClellan-Dyal Video camera operators: Charles Nestell, Brian Corbiere, Pauline Barber and assistance from Carrie Leaureaux & Sammie McClellan-Dyal This book was made possible by the Department of Health and Human Services, Administration for Native Americans, and a match by the Grand Traverse Band of Ottawa & Chippewa Indians. The initial grant team consisted of Carrie Leaureaux, Sammie McClellan-Dyal, Brian Corbiere and Eva Petoskey. r Table of CoiA.teiA.ts Acknowledgements i Map of Beaver Island in relation to Lake Michigan Map of Beaver Island 1 Art Lewis 2 Mary Boulton 5 Pat Wabanimkee 7 Ring of stones 9 Cecelia Boomer Drawing of Rabbit snare ,...10 Ernest Gablow 11 Carolyn Ramey 12 Irene Mitchell 14 Jim Mitchell 15 Helen Paul 16 Gindaaswinan—Island words 17 Vowel-Consonant Syllable Chart 18 References 18 r Beaver Island is located about 30 miles from Charlevoix, Michigan, off the coast of Lake Michigan. Beaver Island is about 15 miles long and 6 miles wide. Gull Island, High Island, Trout Island, Whiskey Island, Garden Island and Hog Island surround Beaver Island, but Beaver Island is the largest of this group of islands.
    [Show full text]
  • A New Greenland Ice Core Chronology for the Last Glacial Termination ———————————————————————— S
    JOURNAL OF GEOPHYSICAL RESEARCH, VOL. ???, XXXX, DOI:10.1029/2005JD006079, A new Greenland ice core chronology for the last glacial termination ———————————————————————— S. O. Rasmussen1, K. K. Andersen1, A. M. Svensson1, J. P. Steffensen1, B. M. Vinther1, H. B. Clausen1, M.-L. Siggaard-Andersen1,2, S. J. Johnsen1, L. B. Larsen1, D. Dahl-Jensen1, M. Bigler1,3, R. R¨othlisberger3,4, H. Fischer2, K. Goto-Azuma5, M. E. Hansson6, and U. Ruth2 Abstract. We present a new common stratigraphic time scale for the NGRIP and GRIP ice cores. The time scale covers the period 7.9–14.8 ka before present, and includes the Bølling, Allerød, Younger Dryas, and Early Holocene periods. We use a combination of new and previously published data, the most prominent being new high resolution Con- tinuous Flow Analysis (CFA) impurity records from the NGRIP ice core. Several inves- tigators have identified and counted annual layers using a multi-parameter approach, and the maximum counting error is estimated to be up to 2% in the Holocene part and about 3% for the older parts. These counting error estimates reflect the number of annual lay- ers that were hard to interpret, but not a possible bias in the set of rules used for an- nual layer identification. As the GRIP and NGRIP ice cores are not optimal for annual layer counting in the middle and late Holocene, the time scale is tied to a prominent vol- canic event inside the 8.2 ka cold event, recently dated in the DYE-3 ice core to 8236 years before A.D.
    [Show full text]
  • Late Quaternary Changes in Climate
    SE9900016 Tecnmcai neport TR-98-13 Late Quaternary changes in climate Karin Holmgren and Wibjorn Karien Department of Physical Geography Stockholm University December 1998 Svensk Kambranslehantering AB Swedish Nuclear Fuel and Waste Management Co Box 5864 SE-102 40 Stockholm Sweden Tel 08-459 84 00 +46 8 459 84 00 Fax 08-661 57 19 +46 8 661 57 19 30- 07 Late Quaternary changes in climate Karin Holmgren and Wibjorn Karlen Department of Physical Geography, Stockholm University December 1998 Keywords: Pleistocene, Holocene, climate change, glaciation, inter-glacial, rapid fluctuations, synchrony, forcing factor, feed-back. This report concerns a study which was conducted for SKB. The conclusions and viewpoints presented in the report are those of the author(s) and do not necessarily coincide with those of the client. Information on SKB technical reports fromi 977-1978 {TR 121), 1979 (TR 79-28), 1980 (TR 80-26), 1981 (TR81-17), 1982 (TR 82-28), 1983 (TR 83-77), 1984 (TR 85-01), 1985 (TR 85-20), 1986 (TR 86-31), 1987 (TR 87-33), 1988 (TR 88-32), 1989 (TR 89-40), 1990 (TR 90-46), 1991 (TR 91-64), 1992 (TR 92-46), 1993 (TR 93-34), 1994 (TR 94-33), 1995 (TR 95-37) and 1996 (TR 96-25) is available through SKB. Abstract This review concerns the Quaternary climate (last two million years) with an emphasis on the last 200 000 years. The present state of art in this field is described and evaluated. The review builds on a thorough examination of classic and recent literature (up to October 1998) comprising more than 200 scientific papers.
    [Show full text]
  • Behavior of the James Lobe, South Dakota During Termination I
    Behavior of the James Lobe, South Dakota during Termination I A dissertation submitted to the Graduate School of the University of Cincinnati in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY in the Department of Geology of the McMicken College of Arts and Sciences by Stephanie L. Heath MSc., University of Maine BSc., University of Maine July 18, 2019 Dissertation Committee: Dr. Thomas V. Lowell Dr. Aaron Diefendorf Dr. Aaron Putnam Dr. Dylan Ward i ABSTRACT The Laurentide Ice Sheet was the largest ice sheet of the last glacial period that terminated in an extensive terrestrial margin. This dissertation aims to assess the possible linkages between the behavior of the southern Laurentide margin and sea surface temperature in the adjacent North Atlantic Ocean. Toward this end, a new chronology for the westernmost lobe of the Southern Laurentide is developed and compared to the existing paradigm of southern Laurentide behavior during the last glacial period. Heath et al., (2018) address the question of whether the terrestrial lobes of the southern Laurentide Ice Sheet margin advanced during periods of decreased sea surface temperature in the North Atlantic. This study establishes the pattern of asynchronous behavior between eastern and western sectors of the southern Laurentide margin and identifies a chronologic gap in the western sector. This is the first comprehensive review of the southern Laurentide margin since Denton and Hughes (1981) and Mickelson and Colgan (2003). The results of Heath et al., (2018) also revealed the lack of chronologic data from the Lobe, South Dakota, the westernmost lobe of the southern Laurentide margin.
    [Show full text]
  • A Glacier Runs Through It: Effects of Late Wisconsinan Glaciation on Stream Drainage Near the Terminal Moraine Boundary in North Central Pennsylvania
    University of Pennsylvania ScholarlyCommons Master of Environmental Studies Capstone Department of Earth and Environmental Projects Science May 2008 A Glacier Runs Through It: Effects of Late Wisconsinan Glaciation on Stream Drainage Near the Terminal Moraine Boundary in North Central Pennsylvania Krista Heinlen University of Pennsylvania, [email protected] Follow this and additional works at: https://repository.upenn.edu/mes_capstones Heinlen, Krista, "A Glacier Runs Through It: Effects of Late Wisconsinan Glaciation on Stream Drainage Near the Terminal Moraine Boundary in North Central Pennsylvania" (2008). Master of Environmental Studies Capstone Projects. 21. https://repository.upenn.edu/mes_capstones/21 Presented to the Faculties of the University of Pennsylvania in Partial Fulfillment of the Requirements for the Degree of Master of Environmental Studies 2007. This paper is posted at ScholarlyCommons. https://repository.upenn.edu/mes_capstones/21 For more information, please contact [email protected]. A Glacier Runs Through It: Effects of Late Wisconsinan Glaciation on Stream Drainage Near the Terminal Moraine Boundary in North Central Pennsylvania Abstract Stream morphology in north central Pennsylvania has been influenced yb the passage of multiple glaciers during the Quaternary period, and most recently by the Late Wisconsinan ice sheet which began to recede just 10,000 years ago. While glaciers can take a heavy erosive toll on the landscape, the Late Wisconsinan and previous glaciers stopped when they reached Pennsylvania, and as such were not as thick and did not cover the ground as long as in regions to the north. This paper examines current morphology in an area along the north central part of the state that contains both glaciated and non-glaciated regions.
    [Show full text]
  • Article Is Available Online USA, 2004
    The Cryosphere, 10, 639–664, 2016 www.the-cryosphere.net/10/639/2016/ doi:10.5194/tc-10-639-2016 © Author(s) 2016. CC Attribution 3.0 License. Numerical simulations of the Cordilleran ice sheet through the last glacial cycle Julien Seguinot1,2,3, Irina Rogozhina3,4, Arjen P. Stroeven2, Martin Margold2, and Johan Kleman2 1Laboratory of Hydraulics, Hydrology and Glaciology, ETH Zürich, Zürich, Switzerland 2Department of Physical Geography and the Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden 3Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany 4Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany Correspondence to: Julien Seguinot ([email protected]) Received: 21 June 2015 – Published in The Cryosphere Discuss.: 7 August 2015 Revised: 2 February 2016 – Accepted: 19 February 2016 – Published: 16 March 2016 Abstract. After more than a century of geological research, 1 Introduction the Cordilleran ice sheet of North America remains among the least understood in terms of its former extent, volume, and dynamics. Because of the mountainous topography on During the last glacial cycle, glaciers and ice caps of the which the ice sheet formed, geological studies have often had North American Cordillera have been more extensive than only local or regional relevance and shown such a complexity today. At the Last Glacial Maximum (LGM), a continuous that ice-sheet-wide spatial reconstructions of advance and re- blanket of ice, the Cordilleran ice sheet (Dawson, 1888), treat patterns are lacking. Here we use a numerical ice sheet stretched from the Alaska Range in the north to the North model calibrated against field-based evidence to attempt a Cascades in the south (Fig.1).
    [Show full text]
  • Beaver Island 2003-09 September Beacon
    September 2003 $2.50 Beaver Beacon T h e I s l a n d M o n t h l y S i n c e 1 9 5 5 CMU Art Show A Sail on the Schooner Madeline Greene Family Reunion, Lumber Yard Party, Homecoming 2003 Beaver Island News, Events, Photography, History, People, Art, and lots more... 3. Contents Beaver Beacon September 2003 McDonough's Market Since 1933 On America's Beautiful "Emerald Isle" 38240 Michigan Avenue Beaver Island, MI 49782 (231) 448-2733 Full line of groceries. Custom-cut meat. Fresh Greene Family Reunion ............................................................................ 4. Beaver Beacon produce, Beer, Wine, Liquor, Block & cube The Caledonia anchors in Paradise Bay ..................................................... 4. the Island Monthly since 1955 BIPOA Annual Meeting ............................................................................ 5. ice. Movie rentals. Post cards. Beaver Island Published by The Lumberyaard Party, part 2 ................................................................... 6. Paradise Bay Press clothing, Hardware, Toys, Public Telephone. Beaver Island Health Fair September 13th ................................................... 7. CMU Art Show 2003 ................................................................................. 8. Beaver Beacon Small & major appliances, Greeting cards, P.O. Box 254 On This Date ............................................................................................. 10. Notary service. Michigan lottery. Fax, Money Beaver Island, MI 49782 Charlevoix County Commissioners;
    [Show full text]