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Tesi sul tema "Paleoecology"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Mattos, Nathália Helena Secol 1988. "Geoquímica e proveniência do Grupo Bauru no Oeste de Minas Gerais." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/286616.

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Orientador: Alessandro Batezelli<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Geociências<br>Made available in DSpace on 2018-08-25T21:40:30Z (GMT). No. of bitstreams: 1 Mattos_NathaliaHelenaSecol_M.pdf: 5195246 bytes, checksum: 2551186b0e4a53abcac203b4227922a3 (MD5) Previous issue date: 2014<br>Resumo: Estudos geoquímicos e mineralógicos de arenitos e argilitos da Bacia Bauru (Cretáceo Superior), localizada na região do Triângulo Mineiro (Minas Gerais) foram realizados visando à determinação da proveniência, tectônica da rocha fonte, o papel de processos como

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2

Voltani, Cibele Gasparelo. "Redescrição osteológica comentada e aspectos paleoecológicos dos gêneros Notelops e Rhacolepis (Pachyrhizodontoidei) /." Rio Claro, 2016. http://hdl.handle.net/11449/141899.

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Orientador: Reinaldo José Bertini<br>Banca: Roberto Goitein<br>Banca: Marise Sardenberg Salgado de Carvalho<br>Banca: Alcina Magnólia da Silva Franca<br>Banca: Maria Helena Ribeiro Hessel<br>Resumo: A Bacia do Araripe situa-se no Nordeste brasileiro, e sua área estende-se sobre os estados de Ceará, Pernambuco e Piauí. Esta bacia sedimentar apresenta formações geológicas de idade paleozoica e mesozoica em cujos estratos estão fossilizados diversos tipos de organismos. A Formação Santana, eocretácica, possui destaque em termos de diversidade e qualidade dos organismos fossilizados. O Membro Romu

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3

Silveira, Rosemery Rocha da. "Bioestratigrafia e paleoecologia de depósitos neógenos e pleistocenos aflorantes na porção central e ocidental da Bacia do Solimões, Estado do Amazonas, Brasil." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/132294.

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As 93 amostras palinológicas obtidas deste estudo são oriundas de 12 afloramentos relacionados às formações Solimões e Içá, na região de Coari (5 afloramentos) e Alto Solimões (7 afloramentos), Bacia do Solimões, no estado do Amazonas. Este trabalho apresenta os palinomorfos reconhecidos nestes depósitos (incluindo descrições quando necessárias), com registro fotomicrográfico, relativos a 11 taxons de esporos de fungos, 7 algas, 1 escolecodonte, 1 cisto de dinoflagelado, 31 esporos de pteridófitas, 2 grãos de pólen de gimnospermas e 48 grãos de pólens de angiospermas. Perfis compostos foram co

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4

Sudhaus, Dirk. "Paläoökologische Untersuchungen zur spätglazialen und holozänen Landschaftsgenese des Ostschwarzwaldes im Vergleich mit den Buntsandsteinvogesen /." Freiburg i. Br. : Institut für Physische Geographie der Albert-Ludwigs-Universität, 2005. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014181535&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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5

Glenwright, T. Lane. "Diatom-based palaeoecology of Kowloon Bay, Hong Kong /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22032423.

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6

Liu, Liping. "Chinese fossil Suoidea : systematics, evolution and paleoecology." Helsinki : University of Helsinki, 2003. http://ethesis.helsinki.fi/julkaisut/mat/geolo/vk/liping/.

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7

Tosal, Alcobé Aixa. "Modelització paleoclimàtica del límit Eocè–Oligocè a Catalunya a partir de l’anàlisi CLAMP." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/668462.

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Aquesta tesi té com a objectiu modelitzar el paleoclima del trànsit Eocè−Oligocè de la Conca de l’Ebre i conèixer com aquest canvi afectà a la flora local. Aquesta caracterització paleoclimàtica s’ha obtingut a partir de l’estudi de les fulles de dicotiledònies de les localitats de Sarral (Priabonià terminal) i Cervera (Rupelià inferior) mitjançant CLAMP (Climate Leaf Analysis Multivariate Program). Per altra banda, per tal de poder caracteritzar els canvis florístics entre ambdues localitats, s’ha estudiat la seva taxonomia, tafonomia i paleoecologia així com la sedimentologia dels dipòsits q

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8

Briles, Christy Elaine. "Holocene vegetation and fire history of the floristically diverse Klamath Mountains, northern California, USA /." Connect to title online (Scholars' Bank) Connect to title online (ProQuest), 2008. http://hdl.handle.net/1794/7486.

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Thesis (Ph. D.)--University of Oregon, 2008.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 217-227). Also available online in Scholars' Bank; and in ProQuest, free to University of Oregon users.

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9

Sandau, Stephen D. "The Paleoclimate and Paleoecology of a Uintan (Late Middle Eocene) flora and fauna from the Uinta Basin, Utah /." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd719.pdf.

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10

Minckley, Thomas A. "Holocene environmental history of the northwestern Great Basin and the analysis of modern pollen analogues in western North America /." view abstract or download file of text, 2003. http://wwwlib.umi.com/cr/uoregon/fullcit?p3113019.

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Thesis (Ph. D.)--University of Oregon, 2003.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 294-310). Also available for download via the World Wide Web; free to University of Oregon users.

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11

Klug, Christopher Allen. "Lower Permian through Lower Trassic [sic] paleontology, stratigraphy, and chemostratigraphy of the Bilk Creek Mountains of Humboldt County, Nevada." Bowling Green, Ohio : Bowling Green State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1184878826.

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12

Carter, Brian D. "Paleoecological reconstructions of the South African Plio-Pleistocene based on low-magnification dental microwear of fossil primates." unrestricted, 2006. http://etd.gsu.edu/theses/available/etd-11302006-174657/.

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Thesis (M.A.)--Georgia State University, 2006.<br>Title from title screen. Frank L. Williams, committee chair; Cassandra White, Susan C. McCombie, committee members. Description based on contents viewed June 25, 2007. Includes bibliographical references (p. 89-99).

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13

Samuels, Joshua Xavier. "Paleoecology and functional morphology of beavers (family castoridae)." Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1495959451&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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14

Tarrats, Sada Pol. "Chrinomids as lake paleoenvironmental indicators: the role of present fauna to understand the past." Doctoral thesis, Universitat de Barcelona, 2018. http://hdl.handle.net/10803/462104.

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The study of past ecological changes is highly useful for understanding how ecosystems have responded to climate and human-induced disturbances. It is thus relevant in the context of climate change, as it allows several ecological processes and properties, such as ecosystem baseline conditions or resilience, to be evaluated. This thesis focuses on the study of past ecological changes in mountain lakes, which are widely considered to be sentinel ecosystems due to their ability to effectively record signals of climate change and anthropogenic impacts in their sediments. To do this we use Chiron

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15

Cook, Lewis A. "Systematics and evolutionary paleoecology of crinoids from the St. Louis Limestone (Mississippian, Meramecian) of the Illinois Basin." Morgantown, W. Va. : [West Virginia University Libraries], 2010. http://hdl.handle.net/10450/11042.

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Thesis (Ph. D.)--West Virginia University, 2010.<br>Title from document title page. Document formatted into pages; contains x, 180 p. : ill. (some col.), maps (some col.). Vita. Includes abstract. Includes bibliographical references (p. 149-172).

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16

Sessa, Jocelyn A. "The dynamics of rapid, asynchronous biotic turnover in the middle Devonian Appalachian basin of New York : a thesis /." Connect to The dynamics of rapid, asynchronous biotic turnover in the middle Devonian Appalachian basin of New York (Online), 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=1054576413.

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17

Cheung, Man-ching, and 張敏青. "Holocene paleo-environmental reconstruction in central Tibetan plateau inferred from a lacustrine sediment record." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/211563.

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Previous studies on reconstructing the paleoclimate on the Tibetan Plateauare commonly based on a single proxy, and have thus limited the usage of their results. Therefore this study was designed firstly to evaluate the applicability of organic carbon isotopes from modern plants in the Tibetan Plateau as a paleo-environmental proxy, and secondly to apply palynology, organic geochemistry and biomarkers to the reconstructions ofpaleo-environmental history of central Tibet. The new, comprehensive records reveal the history of regional precipitation, temperature and vegetation change in responding

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18

Sawada, Michael Charles. "Late quaternary paleoclimates and biogeography of North America." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/9031.

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Pollen, spores, and dinoflagellate cysts are used with the modern analog technique (MAT) to provide paleoclimate reconstructions for terrestrial and marine environments in northeastern North America. Multivariate analysis of marine and nearby terrestrial pollen sequences from Hudson Bay, Labrador and the St. Lawrence, differentiate tundra, boreal and deciduous forest assemblages in time and space. These three regions had differing climate histories with respect to deglaciation and air mass boundaries. Prior to 6000 14C yr BP, cooler temperatures reconstructed along the Labrador margins agree w

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19

Deschamps, Eric Martin. "Mammalian paleoecology of a Caverne de la Mine (Quebec, Canada): Analysis of an early Holocene cave deposit." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/9197.

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The aim of this study is to analyse a mammalian terrestrial fossil fauna in order to assess the early Holocene fauna of the St. Lawrence-Ottawa valley region. The fossils were excavated from Caverne de la Mine located on the Eardley Escarpment in Gatineau Park, western Quebec, near the city of Ottawa (45°28'18"N, 75°51'01"W). The fossil deposit dated between 5 020 +/- 70 and 8 230 +/- 80 B.P. yielded twenty-three taxa among ten mammalian families. Two species, Dicrostonyx hudsonius and Microtus pinetorum, are not part of the modern local fauna. Analysis of the fossil assemblage has sh

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20

Bouchard, Giselle. "Freshwater diatom biogeography of the Canadian Arctic Archipelago." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26589.

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The biogeography of diatoms in 62 lakes across the Canadian Arctic Archipelago was studied. A total of 326 taxa was found, with up to 85 and as low as 8 taxa identified in any one lake. Rarefaction-estimated richness correlated with lake size. Although diatom assemblages showed regional patterns, between-lake variability in any region was high, indicating that local factors are important in determining the assemblages. Newly delineated genera showed interpretable geographic patterns and could be related to environmental factors, suggesting that this more natural grouping may enhance our unders

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21

Lacourse, Terri. "Late Quaternary vegetation history of Sulphur Lake, southwest Yukon Territory, Canada." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0005/MQ36711.pdf.

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22

Brooks, A. M. "The systematics, paleoecology and stratigraphy of British Palaeozoic scolecondonts." Thesis, Open University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375541.

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23

Sakakura, Norihiko. "Taxonomy and paleoecology of Paleogene Cyclocardia (Bivalvia) from Japan." 京都大学 (Kyoto University), 2002. http://hdl.handle.net/2433/149544.

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24

Falzoni, F. "SANTONIAN-CAMPANIAN PLANKTONIC FORAMINIFERAL BIOSTRATIGRAPHY, TAXONOMY AND ISOTOPE PALEOECOLOGY." Doctoral thesis, Università degli Studi di Milano, 2012. http://hdl.handle.net/2434/169982.

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Current biozonations based on Santonian-Campanian (Late Cretaceous) planktonic foraminiferal bioevents do not provide a high stratigraphic resolution, when compared to other time intervals. Moreover, some of the marker species of the Tethyan biozonation show a diachronous lowest occurrence across latitudes and a restricted geographic distribution. Thus, paleoclimatic and paleoceanographic inferences are poorly constrained by biostratigraphy and, in addition, are often based on diagenetically altered material. This study is aimed to 1) improve the biostratigraphic resolution of Santonian-Camp

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25

Glenwright, Thomas Lane. "Diatom-based palaeoecology of Kowloon Bay, Hong Kong." Thesis, Click to view the E-thesis via HKUTO, 2000. http://sunzi.lib.hku.hk/hkuto/record/B42575576.

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26

White, Stephanie. "Effects of drilling predation on global turritellid diversity and abundance a potential catalyst for evolution /." View electronic thesis (PDF), 2009. http://dl.uncw.edu/etd/2009-3/whites/stephaniewhite.pdf.

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27

Junior, Antonio Alvaro Buso. "Dinâmica dos Espodossolos, da vegetação e do clima durante o Quaternário tardio na região nordeste do estado do Espírito Santo." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/64/64134/tde-24082015-142743/.

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Esse trabalho, realizado na região nordeste do estado do Espírito Santo, é dividido em duas partes. A primeira envolve a caracterização da precipitação polínica moderna da vegetação de mata de tabuleiros e de duas fisionomias de vegetação de muçununga. A segunda consiste na reconstrução paleoambiental no Quaternário tardio, com base em estudo interdisciplinar aplicado a Espodossolos e sedimento lacustre. A caracterização da precipitação polínica moderna mostrou que a mata de tabuleiros é marcada por maiores taxas de acumulação polínica, maiores frequências de Urticaceae/Moraceae e presença de

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28

BADINO, FEDERICA. "Holocene vegetation and climate variability as recorded in high-altitude mires (western Italian Alps)." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2016. http://hdl.handle.net/10281/131067.

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Climate variability during the Holocene (the last 11700 calendar yr b2k) is relatively subtle whether compared with the higher amplitude characterizing the last glacial period. Nonetheless, several proxy data (e.g. pollen, plant macrofossils, glacier length variations), indicate detectable changes in temperature and/or moisture during this period. Retreating glaciers may uncover peat sequences that were once ice-buried. Palynological analysis of those organic deposits provides information on plant communities colonization in proglacial areas as well as long-distance vegetations signal. The a

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29

Bonde, Joshua William. "Paleoecology and taphonomy of the Willow Tank Formation (Albian), Southern Nevada." Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/2008/bonde/BondeJ1208.pdf.

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This study documents fossil remains from the Willow Tank Formation and places those remains into a taphonomic and sedimentological context in order to determine the paleoecology of southern Nevada during the Early Cretaceous (Albian). Recovered taxa include Lepisosteidae, Ceratodus, Holostean A, Naomichelys, Baenidae, c.f. Adocus, possible Trionychidae, Crocodyliformes, Thyreophora, Iguanodontia, Titanosauriformes, Tyrannosauroidea, Dromaeosauridae, indet. Theropoda, and two fern morphotypes. Sedimentology of the fossiliferous unit of the Willow Tank Formation suggests these taxa were deposite

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30

Bergolc, Melanie L. "A Paleoenvironmental Analysis Using Fossil Insects in Late Quaternary Deposits in Indiana and Ohio." Bowling Green State University / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1092940677.

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31

Bahman, Heedar. "REEVALUATING THE MIOCENE MOLLUSK SYSTEMATICS, LITTLE COVE POINT MEMBER, ST. MARYS FORMATION, AND EXAMINING THEIR PALEOECOLOGY, PALEOBIODIVERSITY." Kent State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent1625579235981025.

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32

Hu, Feng Sheng. "An ecosystem approach to the study of late-Quaternary environmental change in southwestern Alaska /." Thesis, Connect to this title online; UW restricted, 1994. http://hdl.handle.net/1773/5577.

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33

Calede, Jonathan J. 1988. "Systematics and paleoecology of northern Great Basin Mylagaulidae (Mammalia: Rodentia)." Thesis, University of Oregon, 2010. http://hdl.handle.net/1794/11435.

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xx, 281 p. : ill. A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.<br>Burrowing rodents are important ecosystem engineers in today's environments. The fossil record offers the opportunity to study patterns and processes in the evolution of the burrowing rodent guild through the Cenozoic. During the Miocene, this guild was very diverse, including numerous families ranging in ecology from semi-fossorial to subterranean. I use the emblematic family Mylagaulidae, a group of subterranean rodents, to test hypotheses

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34

Simpson, Emily. "Paleoecology and Land-Use of Quaternary Megafauna from Saltville, Virginia." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etd/3590.

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Land-use, feeding habits, and response to seasonality by Quaternary megaherbivores in Saltville, Virginia, is poorly understood. Stable isotope analyses of serially sampled Bootherium and Equus enamel from Saltville were used to explore seasonally calibrated (δ18O) patterns in megaherbivore diet (δ13C) and land-use (87Sr/86Sr). Overall, this dataset suggests an open forest with relatively constant temperatures year round that were similar to modern conditions. Neither Bootherium or Equus individuals spent a significant amount of time at higher elevations in the nearby Blue Ridge geologic provi

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35

Connely, Melissa V. "Stratigraphy and Paleoecology of the Morrison Formation, Como Bluff, Wyoming." DigitalCommons@USU, 2002. https://digitalcommons.usu.edu/etd/6736.

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The Morrison Formation at Como Bluff, Wyoming, has been historically known for containing a rich source of Late Jurassic vertebrate fossils. However, when collected, most of these fossils were not positioned into a stratigraphic or sedimentologic framework. Research shows that the Morrison Formation at Como Bluff can be divided into three members. These members can be identified by lithologic and paleontological characteristics. The lower Morrison members include the Windy Hill Member and the recently described Lake Como Member. The Windy Hill Member primarily contains near-shore marine sandst

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36

Suteethorn, Suravech. "Sauropod dinosaurs of the Southeast Asia : systematic, evolution and paleoecology." Montpellier 2, 2009. http://www.theses.fr/2009MON20088.

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Whitmore, Johanne. "North American and Greenland modern pollen data for multi-scale paleoecological and paleoclimatic applications." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26807.

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The status of the modern pollen network in North America and Greenland is presented by assembling a database for use in quantitative calibration studies and paleoenvironmental reconstructions. The geo-referenced database includes 4569 samples from all regions of the continent. The database includes 934 pollen taxa that range from common taxa to those that may be used for regional-scale reconstructions. Climate data and vegetation characteristics are assigned to every site. A series of procedures, both automated and manual, were used to check the qualify of the pollen data. Data are currently a

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38

Shiraki, Masahiro. "Upper Devonian sponge-algal mud mounds, southern flank of Miette reef complex, Jasper National Park, Alberta, Canada." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27409.

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A series of small mud mounds are exposed in the McConnell and Miette thrust sheets on the southern flank of the Miette reef complex. They occur on the southeastward inclined carbonate clinoforms of the late Frasnian Arcs Member. These mounds are rooted on marine, argillaceous lime mudstones and are surrounded by lime mudstones of several prograding clinoforms of the upper Arcs Member or dolomitic siltstones of the lower Ronde Member.<br>Mounds are approximately 17 to 36 m high and 32 to 81 m wide and columnar to domal in shape. The lower part of the mounds consists of sponge-rich wackestones a

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Rashid, Harunur. "The deep-sea record of rapid late pleistocene paleoclimate change and ice-sheet dynamics in Labrador sea sediments /." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38540.

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Thirty eight piston cores and numerous seismic profiles collected by two R/V Marion Dufresne and several CSS Hudson cruises were examined and cores from other cruises reinterpreted in the course of this study of Late Pleistocene ice-rafting events (Heinrich events) in the Labrador Sea.<br>In the northwestern Labrador Sea, close to the margin of the former Laurentide Ice Sheet, Heinrich layers are unusually thick. Thicknesses of up to 4.8 m result from deposition from nepheloid-flows and low-density turbidity flows and from iceberg melting. Heinrich layers formed in three stages, explained by a

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40

Herring, Erin Mauryeen. "Late Quaternary and Holocene paleoecology of interior mesic forests of northern Idaho." Thesis, University of Oregon, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3644438.

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<p> The mesic forests distributed within the Rocky Mountains of northern Idaho are unique because many species contained within the forest are separated from their main distribution along the Pacific Northwest coast. It remains unclear whether most species within the inland disjunction survived the glacial periods of the Pleistocene, or whether they were more recently dispersed from coastal populations. To see if the dominant tree taxa of the mesic forests today could have persisted in a refugium south of the large ice sheets, four sediment cores were used to reconstruct the vegetation and cli

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41

Rode, Sandra Lee 1955. "FORAMINIFERA AS A TEST OF HERITABILITY OF SPECIATION POTENTIAL." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276479.

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If species selection shapes the history of clades, we should be able to detect its impact within well-established monophyletic descent groups. We should find that high rates of speciation/extinction are heritable. Demonstrating that high speciation/extinction rates have not been transmitted along known lines of descent would prove that species selection had not played an important role with the descent group under study. I have screened speciation rates within the Cenozoic planktonic foraminifera for heritability. Neither modified parent-offspring tests nor rank concordance tests reveal inheri

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42

Leone, Karen L. "Sedentism in the Middle Woodland: Archaeobotanical Evidence from the Strait Site." The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1392307246.

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43

Anton, Ann. "Paleolimnology of an equatorial lake in the Inter-Andean Plateau of Ecuador /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487326511714434.

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44

Kempf, Hannah Lowe. "Comparisons of Ecosystem Dynamics Before and After Invasion Reveal Consequences of Invasive Species in Benthic Marine Communities." Miami University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=miami1524830000208304.

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45

Mitchell, Emily Geraldine Harmsworth. "Quantitative approaches to understanding ediacaran ecology." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664750.

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46

Cole, Simon L. "Paleoenvironmental reconstruction of the Upper Mississippian Reynolds Limestone in the central Appalachian Basin of West Virginia." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3971.

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Abstract (sommario):

Thesis (M.S.)--West Virginia University, 2005.<br>Title from document title page. Document formatted into pages; contains viii, 136 p. : ill. (some col.), maps (some col.). Includes abstract. Includes bibliographical references (p. 75-79).

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47

Biondi, Franco. "Spatial and temporal reconstruction of twentieth-century growth trends in a naturally-seeded pine forest." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186783.

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This research uncovered growth trends from 1920 to 1990 in a stand of south-western ponderosa pine (Pinus ponderosa Dougl. ex Laws. var. scopulorum), and investigated the role of climate and competition in shaping the observed trends. I focused on a 800 x 400-m permanent plot maintained by the U.S. Forest Service since 1920 near Flagstaff, Arizona. Temporal growth trends were quantified by size class using a mixed linear model applied to forest inventories, repeated at 10-year intervals. Tree density and stand basal area increased from 1920 to 1990, but growth rates of individual trees decline

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48

Tanck, Glen S. 1951. "Distribution and origin of organic carbon in the Upper Cretaceous Niobrara Formation and Sharon Springs Member of the Pierre Shale, Western Interior, United States." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282423.

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Abstract (sommario):

The Upper Cretaceous Niobrara Formation and the overlying Sharon Springs Member of the Pierre Shale are two of several organic-carbon (OC) rich units deposited in the Western interior seaway. A key to assessing the validity of models proposed to account for OC enrichment in these units is understanding the three-dimensional (3D) distribution of OC within these units. Within the study area abundant subsurface data in the form of geophysical well logs are available. These logs were used to divide the Niobrara and Sharon Springs into regionally correlatable chronostratigraphic horizons and to est

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49

Pierazzo, Elisabetta 1963. "The Chicxulub impact event and the environmental catastrophe at the end of the Cretaceous Period." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282564.

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Abstract (sommario):

Impact events may have affected the evolution of life on Earth. The mass extinction event at the end of the Cretaceous Period, which includes the demise of the dinosaurs, has been linked to the large impact event that produced the Chicxulub structure located in the Yucatán Peninsula, Mexico. Unfortunately, the geologic record is too spotty to prove any causal relation between the impact event and the mass extinction event that occurred 65 Myr ago. However, the size and location of the impact structure have drawn attention to impact-related abrupt perturbations of the climate and their effects

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50

Van, de Water Peter Kent. "δ¹³C and stomatal density variability in modern and fossil leaves of key plants in the western United States". Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/289058.

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Abstract (sommario):

During the last deglaciation, 15,000 to 12,000 calendar years ago, global warming and wholesale shifts in regional precipitation patterns produced dramatic changes in vegetation worldwide. Paleobotanical records, namely pollen and macrofossils, have been used not only to reconstruct shifts in plant distributions and abundances, but also to quantify changes in temperature and precipitation amounts or seasonality. In addition to climatic change, during the full glacial period atmospheric CO₂ values had dropped 30% to 200 ppmv compared to the Holocene, preindustrial value of 280 ppmv. Hypothetica

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