18 results
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2. Postglacial emergence of Amund and Ellef Ringnes islands, Nunavut: implications for the northwest sector of the Innuitian Ice Sheet.
- Author
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Atkinson, Nigel and England, John
- Subjects
HOLOCENE stratigraphic geology ,ICE sheets ,GLACIAL landforms ,HOLOCENE paleoceanography ,ABSOLUTE sea level change - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2004
- Full Text
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3. Holocene sediments from a coastal lake on northern Devon Island, Nunavut, Canada.
- Author
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Courtney Mustaphi, Colin J., Gajewski, Konrad, and Lian, Olav
- Subjects
HOLOCENE stratigraphic geology ,MARINE sediments ,ONTOGENY ,FLOODS ,TEMPERATURE effect ,PERMAFROST - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2013
- Full Text
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4. A Late Triassic flora from east-central Axel Heiberg Island, Nunavut, Canada.
- Author
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Vavrek, Matthew J., Larsson, Hans C. E., and Rybczynski, Natalia
- Subjects
TRIASSIC stratigraphic geology ,MESOZOIC stratigraphic geology ,BOTANY ,ISLANDS - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2007
- Full Text
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5. Enigmatic massive sulphide mineralization in the High Arctic Large Igneous Province, Nunavut, Canada1.
- Author
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Wilton, Derek H.C., Saumur, Benoit M., Gordon, Adrian, and Williamson, Marie-Claude
- Subjects
SULFIDE minerals ,IGNEOUS provinces ,PLATINUM group ,SULFIDES ,GEOLOGICAL modeling ,MINERALIZATION - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
- Full Text
- View/download PDF
6. U-Pb zircon geochronology and depositional history of the Montresor group, Rae Province, Nunavut, Canada.
- Author
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Percival, John A., Davis, William J., and Hamilton, Michael A.
- Subjects
URANIUM-lead dating ,GEOCHRONOMETRY ,ZIRCON analysis ,SEDIMENTATION & deposition ,ARENITES ,GEOLOGY - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2017
- Full Text
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7. Metallogeny of the Marco zone, Corvet Est, disseminated gold deposit, James Bay, Quebec, Canada.
- Subjects
METALLOGENY ,GOLD ,SEDIMENTATION & deposition ,PORPHYRY ,FELDSPAR ,AMPHIBOLITES - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2012
- Full Text
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8. Olenelloid trilobites from Cambrian Series 2 of Devon Island, Nunavut, Arctic Canada.
- Author
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Peel, John S. and Jin, Jisuo
- Subjects
TRILOBITES ,ANIMAL species ,GEOLOGICAL formations ,ROBUST control - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2011
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9. Early Devonian stylonurine eurypterids from Arctic Canada.
- Author
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Lamsdell, James C., Braddy, Simon J., Loeffler, Elizabeth J., and Dineley, David L.
- Subjects
ISLANDS ,FLUVIAL geomorphology ,GEOMORPHOLOGY ,ARCHAEOLOGICAL finds - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2010
10. Holocene and Last Interglacial cloudiness in eastern Baffin Island, Arctic Canada.
- Author
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Fréchette, Bianca, de Vernal, Anne, and Richard, Pierre J. H.
- Subjects
HOLOCENE stratigraphic geology ,BIOTIC communities ,TUNDRAS ,UPPER air temperature ,PLANT diversity ,SEDIMENTS - Abstract
This study presents Last Interglacial and Holocene vegetation and climate changes at Fog Lake (67°11′N, 63°15′W) on eastern Baffin Island, Arctic Canada. The vegetation cover is reported as vegetation structural types (or biomes). July air temperature and sunshine during the growing season (June–July–August–September) were reconstructed from pollen assemblages using the modern analogue technique. The vegetation of the Last Interglacial period evolved from a prostrate dwarf-shrub tundra to a low- and high-shrub tundra vegetation. The succession of four Arctic biomes was distinguished from the Last Interglacial sediments, whereas only one Arctic biome was recorded in the Holocene sediments. From ca. 8300 cal. years BP to present, hemiprostrate dwarf-shrub tundra occupied the soils around Fog Lake. During the Last Interglacial, growing season sunshine was higher than during the Holocene and July air temperature was 4 to 5 °C warmer than present. A principal component analysis helped in assessing relationship between floristic gradients and climate. The major vegetation changes through the Last Interglacial and Holocene were driven by July air temperature variations, whereas the minor, or subtle, vegetation changes seem rather correlated to September sunshine. This study demonstrates that growing season sunshine conditions can be reconstructed from Arctic pollen assemblages, thus providing information on feedbacks associated with cloud cover and summer temperatures, and therefore growing season length. Cette étude présente les changements climatiques et de végétation survenus au cours du dernier interglaciaire et de l’Holocène au lac Fog (67°11′N, 63°15′O), sur la côte est de la Terre de Baffin, dans l’Arctique canadien. La couverture végétale est décrite sous forme de biomes, c.-à-d. de structures de végétation. La température de l’air en juillet et l’ensoleillement lors de la saison de croissance (juin, juillet, août, septembre) ont été reconstitués à partir d’assemblages polliniques selon la méthode des analogues modernes. La végétation de la dernière période interglaciaire a évolué d’une toundra arbustive naine, prostrée à une toundra arbustive basse et haute. Une succession de quatre biomes est visible dans les sédiments du dernier interglaciaire, alors qu’un seul biome est observé dans les sédiments de l’Holocène. Une toundra arbustive hémiprostrée colonize les sols des environs du lac Fog depuis environ 8300 années. Au cours du dernier interglaciaire, l’ensoleillement durant de la saison de croissance était plus élevé que lors de l’Holocène et la température de juillet était de 4 à 5 °C plus chaude qu’actuellement. Une analyse en composantes principales a permis d’évaluer la relation entre les gradients floristiques et le climat. Les changements majeurs de végétation lors du dernier interglaciaire et de l’Holocène découlent principalement des variations de la température de juillet, alors que les changements de végétation plus subtils sont plutôt liés à l’ensoleillement en septembre. Cette étude démontre que les conditions d’ensoleillement lors de la saison de croissance peuvent être déduites à partir des assemblages polliniques des sédiments de l’Arctique, fournissant ainsi de l’information pertinente sur les rétroactions associées au couvert nuageux et aux températures estivales et donc sur la durée de la saison de croissance. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
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11. The case of the blood-covered egg: ectoparasite abundance in an arctic goose colony.
- Author
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Harriman, V. B., Alisauskas, R. T., and Wobeser, G. A.
- Subjects
GEESE ,EGGS ,FLEAS ,NESTS ,COLONIAL birds ,HABITATS ,CERATOPHYLLUS ,PARASITES - Abstract
Since 1991, blood-covered eggs have been noted in nests of Ross’s (Chen rossii (Cassin, 1861)) and lesser snow (Chen caerulescens caerulescens (L., 1758)) geese at the Karrak Lake colony, Nunavut, Canada. Fleas (Ceratophyllus vagabundus vagabundus (Boheman, 1866)) were subsequently observed to be associated with goose nests containing eggs covered with dried blood. We examined prevalence of blood presence on goose eggs and extent of egg coverage with blood in goose nests from 2001 to 2004. Flea abundance in nests was estimated in 2003 and 2004, and was strongly correlated with the proportion of goose egg surface covered by blood, suggesting that degree of blood coverage was a suitable index of flea abundance. Extent of blood fluctuated annually and was correlated with both host characteristics and host habitat factors. Nest bowls used by geese in previous years contained more fleas than did new nest bowls, and fleas were more abundant in older areas of the colony. Flea abundance increased with goose clutch size and was highest in rock and birch habitats. Ceratophyllus vagabundus vagabundus appears to be a new parasite of geese at Karrak Lake; flea abundance may change in response to increased availability of favorable habitat, which is expected if local climate warms. Depuis 1991, on observe des oeufs recouverts de sang dans les nids des oies de Ross (Chen rossii (Cassin, 1861)) et des petites oies des neiges (Chen caerulescens caerulescens (L., 1758)) dans la colonie du lac Karrak, Nunavut, Canada. On a ensuite associé la présence de puces (Ceratophyllus vagabundus vagabundus (Boheman, 1866)) aux nids d’oies contenant des oeufs recouverts de sang séché. Nous avons examiné la prévalence de la présence de sang sur les oeufs d’oies et l’étendue de la couverture de sang dans les nids d’oies de 2001 à 2004. Nous avons estimé l’abondance des puces dans les nids en 2003 et 2004; celle-ci est en forte corrélation avec la proportion de la surface des oeufs d’oies recouverte de sang, ce qui laisse penser que l’importance de la couverture de sang est un bon indice de l’abondance des puces. L’importance du sang varie d’une année à l’autre et est en corrélation avec tant les caractéristiques de l’hôte que les facteurs de l’habitat de l’hôte. Les cuvettes de nidification utilisées les années antérieures contiennent plus de puces que les nouvelles cuvettes de nidification et les puces sont plus abondantes dans les zones plus anciennes de la colonie. L’abondance des puces augmente en fonction de la taille de la couvée des oies et elle est maximale dans les habitats de pierres et de bouleaux. Ceratophyllus vagabundus vagabundus semble être un nouveau parasite des oies au lac Karrak; on s’attend à ce que l’abondance des puces change en réaction à la disponibilité accrue d’habitats favorables prévue dans le cas d’un réchauffement du climat local. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
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12. A preliminary radiolarian biozonation for the Lower Silurian of the Cape Phillips Formation, Nunavut, Canada.
- Author
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MacDonald, Eugene W.
- Subjects
EARTH sciences ,RADIOLARIA ,SILURIAN stratigraphic geology ,CORONAGRAPHS ,GRAPTOLITES ,ORDOVICIAN stratigraphic geology ,TOMOGRAPHY - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2006
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13. The brachymetopid trilobite Radnoria in the Silurian (Wenlock) of New York State and Arctic Canada.
- Author
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Adrain, Jonathan M. and Tetreault, Denis K.
- Subjects
TRILOBITES ,SILURIAN stratigraphic geology ,CHEST (Anatomy) ,SPECIES ,NAMES ,GEOLOGY - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2005
- Full Text
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14. Cosmogenic exposure dating in arctic glacial landscapes: implications for the glacial history of northeastern Baffin Island, Arctic Canada.
- Author
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Briner, Jason P., Miller, Gifford H., Davis, P. Thompson, and Finkel, Robert C.
- Subjects
GLACIERS ,ICE sheets ,GLACIOLOGY ,ICE fields - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2005
- Full Text
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15. Late Holocene syngenetic ice-wedge polygons development, Bylot Island, Canadian Arctic Archipelago.
- Author
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Fortier, Daniel and Allard, Michel
- Subjects
HOLOCENE paleoceanography ,ICE-wedge polygons ,PATTERNED ground - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2004
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16. Sm–Nd fluorite dating of Proterozoic low-sulfidation epithermal Au–Ag deposits and U–Pb zircon dating of host rocks at Mallery Lake, Nunavut, Canada.
- Author
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Turner, William A., Heaman, Larry M., and Creaser, Robert A.
- Subjects
ZIRCON ,FLUORITE ,URANIUM - Abstract
Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2003
- Full Text
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17. Terrestrial trophic dynamics in the Canadian Arctic.
- Author
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Krebs, Charles J., Danell, Kjell, Angerbjörn, Anders, Agrell, Jep, Berteaux, Dominique, Bråthen, Kari Anne, Danell, Öje, Erlinge, Sam, Fedorov, Vadim, Fredga, Karl, Hjältén, Joakim, Högstedt, Göran, Jónsdóttir, Ingibjörg S., Kenney, Alice J., Kjellén, Nils, Nordin, Torgny, Roininen, Heikki, Svensson, Mikael, and Tannerfeldt, Magnus
- Subjects
TROPISMS ,TUNDRA ecology - Abstract
The Swedish Tundra Northwest Expedition of 1999 visited 17 sites throughout the Canadian Arctic. At 12 sites that were intensively sampled we estimated the standing crop of plants and the densities of herbivores and predators with an array of trapping, visual surveys, and faecal-pellet transects. We developed a trophic-balance model using ECOPATH to integrate these observations and determine the fate of primary and secondary production in these tundra ecosystems, which spanned an 8-fold range of standing crop of plants. We estimated that about 13% of net primary production was consumed by herbivores, while over 70% of small-herbivore production was estimated to flow to predators. Only 9% of large-herbivore production was consumed by predators. Organization of Canadian Arctic ecosystems appears to be more top-down than bottom-up. Net primary production does not seem to be herbivore-limited at any site. This is the first attempt to integrate trophic dynamics over the entire Canadian Arctic. [ABSTRACT FROM AUTHOR]
- Published
- 2003
- Full Text
- View/download PDF
18. Early Eocene Leptictida, Pantolesta, Creodonta, Carnivora, and Mesonychidae (Mammalia) from the Eureka Sound Group, Ellesmere Island, Nunavut.
- Author
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Eberle, Jaelyn J and McKenna, Malcolm C
- Subjects
LEPTICTIDAE ,MESONYCHIDAE ,FOSSILS - Abstract
We describe the leptictid Prodiacodon; the pantolestids Palaeosinopa sp.nov., cf. Palaeosinopa, and Pantolestidae, gen. et sp. indet.; the creodonts Palaeonictis and Prolimnocyon; the carnivorans Viverravus, cf. Vulpavus, and Miacis; and the mesonychid Pachyaena from early Eocene (i.e., Wasatchian) strata of the Eureka Sound Group on central Ellesmere Island, Nunavut. Palaeosinopa and Palaeonictis may have originated in mid-latitude North America and subsequently migrated to Europe via a north Atlantic land bridge, while Prolimnocyon and Pachyaena probably originated in Asia. Additionally, the occurrence of Pachyaena in the Early Eocene of Europe probably is best explained by dispersal from high-latitude North America to Europe via a north Atlantic land bridge. We update the Eureka Sound Group mammalian faunal list.Nous décrivons le leptictidé Prodiacondon, les pantolestidés Palaeosinopa sp.nov. cf. Palaeosinopa et Pantolestidae, gen et sp. indét.; les Créodontes Palaeonictis et Prolimnocyon; les Carnivores Viverravus, cf. Vulpavus et Miacis; ainsi que le mésonychidé Pachyaena provenant des strates du Groupe de Eureka Sound, au centre de l'île Ellesmere, au Nunavut, et datant de l'Éocène précoce (c.-à-d. Wasatchien). Palaeosinopa et Palaeonictis peuvent provenir de latitudes moyennes de l'Amérique du Nord et avoir migré par la suite vers l'Europe par un pont continental nord-américain, alors que Prolimnocyon et Pachyaena peuvent être originaires de l'Asie. De plus, la venue de Pachyaena à l'Éocène précoce en Europe est probablement le mieux expliqué par une dispersion de l'Amérique du Nord vers l'Europe à des latitudes élevées par un pont continental nord-américain. Nous mettons à jour la liste de la faune mammifère du détroit d'Eureka.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
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