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  • 1
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    High-resolution paleomagnetic secular variation and relative paleointensity records from the western Canadian Arctic: implication for Holocene stratigraphy and geomagnetic field behaviourThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network .GEOTOP Contribution 2008-0024.
    Canadian Science Publishing ; 2008
    In:  Canadian Journal of Earth Sciences Vol. 45, No. 11 ( 2008-11), p. 1265-1281
    Details
    In: Canadian Journal of Earth Sciences, Canadian Science Publishing, Vol. 45, No. 11 ( 2008-11), p. 1265-1281
    Abstract: Two piston cores recovered from the Chukchi and the Beaufort seas document Arctic Holocene geomagnetic field behaviour and highlight the potential of secular variation and relative paleointensity as a regional chronostratigraphic tool. Several centennial- to millennial-scale Holocene declination and inclination features can be correlated in both cores, with other high-resolution western North American lacustrine and volcanic paleomagnetic records and with records of changes in Earth’s dipole moment, supporting the geomagnetic origin of these features and implying that they are associated with changes in Earth’s dipole moment.
    Type of Medium: Online Resource
    ISSN: 0008-4077 , 1480-3313
    URL: Article
    DOI: 10.1139/E08-039
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2008
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    detail.hit.zdb_id: 1491201-6
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  • 2
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    Productivité et flux de carbone dans la mer du Labrador au cours des derniers 40 000 ans
    Canadian Science Publishing ; 1994
    In:  Canadian Journal of Earth Sciences Vol. 31, No. 1 ( 1994-01-01), p. 139-158
    Details
    In: Canadian Journal of Earth Sciences, Canadian Science Publishing, Vol. 31, No. 1 ( 1994-01-01), p. 139-158
    Abstract: Geochemical and micropaleontological analyses of Labrador Sea sediments allowed us to intercalibrate indicators of paleoproductivity and paleofluxes of carbon and to reconstitute biogeochemical fluxes, notably in relation to deep sea circulation changes (Western Boundary Undercurrent and North Atlantic Deep Water). Linear or logarithmic relations are observed between the subrecent fluxes of paleoproductivity indicators (coccoliths, diatoms, dinocysts, 230 Th), the 13 C content of left-coiling or sinistral Neogloboquadrina pachyderma, the modern surface water carbon production, and the rates of organic and inorganic carbon (C org , C inorg ) burial. All indicators increase by a factor of 10 2 to 10 3 in response to the evolution of paleosea-surface conditions since the last glacial maximum. Correlations are observed between authigenic C inorg , 230 Th, coccoliths, and 13 C content (left-coiling or sinistral Neogloboquadrina pachyderma), and also between authigenic C org , dinocysts, uranium, and sulfur. Relative C inorg /C org burial rates in the deep sediments ( 〉  3000 m) allow us to calculate a net CO 2 production in the basin. The net CO 2 flux was slightly negative between ~ 20 and ~ 15 ka BP. It reached a first maximum at about 9 ka BP (~ 30 μmol∙cm −2 ∙a −1 CO 2 ) followed by a decrease at ~ 8 ka BP (~ 20 μmol∙cm −2 ∙a −1 ). Since about 7 ka BP, it stabilized at ~ 35 μmol∙cm −2 ∙a −1 . The minimum observed at about 8 ka BP corresponds to a significant rate of C org burial accompanied with a maximum flux of redox-sensitive indicators (uranium, sulfur). This event does not correspond to any change in sea-surface temperature or salinity, nor in deep circulation, but may be related to the reorganization of the atmospheric circulation during a major breakup stage of the Laurentide ice sheet. The close correlation between the change in CO 2 production in the Labrador Sea with variations of atmospheric CO 2 concentrations during the last 20 ka BP suggests that the production of biogenic carbonates in subpolar basins plays a role in the global carbon cycle on the scale of glacial–interglacial climate changes.
    Type of Medium: Online Resource
    ISSN: 0008-4077 , 1480-3313
    URL: Article
    DOI: 10.1139/e94-012
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1994
    detail.hit.zdb_id: 417294-2
    detail.hit.zdb_id: 1491201-6
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  • 3
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    Late Quaternary paleoceanography and paleo-sea ice conditions in the Mackenzie Trough and Canyon, Beaufort SeaThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network .
    Canadian Science Publishing ; 2008
    In:  Canadian Journal of Earth Sciences Vol. 45, No. 11 ( 2008-11), p. 1399-1415
    Details
    In: Canadian Journal of Earth Sciences, Canadian Science Publishing, Vol. 45, No. 11 ( 2008-11), p. 1399-1415
    Abstract: The Mackenzie Trough provides a high resolution signal for paleoceanography as a result of high sedimentation rates at the mouth of the Mackenzie River. Three cores were collected along a transect covering a depth range of 58–671 m and the time period of the last 11 500 cal BP. Prior to the last ∼10 000 cal BP, the distal core is characterized by laminated sediment and a foraminiferal fauna of Arctic Bottom Water calcareous species and abundant planktic foraminifera suggesting little freshwater runoff and (or) perennial sea-ice cover. This occurs at a similar time as laminated sediments from the west of this site, which have been suggested to be part of the Lake Agassiz flood outburst and (or) cold period. If this outburst occurred, the very positive oxygen isotope values from our core (PC3;  〉 +3.0 ppm) indicate that it did not flow through the Mackenzie Trough. After 9000 cal BP, the faunas in the three cores differ because of timing and different water depths. However, it is possible to see a progression of cold saline water prior to 10 000 cal BP, with a freshening of surface water after 10 000 cal BP where tintinnids (brackish water ciliates) occur with incursions of deep water Arctic calcareous species to ∼3000 years BP. A sequence of mixed faunas appears as sea ice returns, at least periodically in the last 3000 cal BP; but (in core PC2 only) a return to more sea ice is recorded by both foraminifera and dinocysts in the last few hundred years.
    Type of Medium: Online Resource
    ISSN: 0008-4077 , 1480-3313
    URL: Article
    DOI: 10.1139/E08-054
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 417294-2
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  • 4
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    Tris(biimidazolato)chromium(III) as a building block for hydrogen-bonded supramolecular assemblies
    Canadian Science Publishing ; 2006
    In:  Canadian Journal of Chemistry Vol. 84, No. 7 ( 2006-07-01), p. 949-959
    Details
    In: Canadian Journal of Chemistry, Canadian Science Publishing, Vol. 84, No. 7 ( 2006-07-01), p. 949-959
    Abstract: The trischelate [Cr(H 2 biim) 3 ](NO 3 ) 3 complex of 2,2′-biimidazole (H 2 biim) was obtained by reacting CrCl 3 ·3THF with [Ag(H 2 biim)](NO 3 ) in methanol. In the solvent-free material, each ligand forms two N-H···O bonds to a nitrate ion and generates locally neutral [Cr(H 2 biim) 3 ](NO 3 ) 3 units. A methanol solvate was also obtained in which intermolecular interactions involve optimal use of the hydrogen-bonding ability of the [Cr(H 2 biim) 3 ] 3+ cations, NO 3 – anions, and methanol molecules. In both cases, there is no long-range regular organization of the complex units. Deprotonation of [Cr(H 2 biim) 3 ](NO 3 ) 3 with NaOCH 3 yielded neutral Cr(Hbiim) 3 . Its powder pattern is similar to that of Ru(Hbiim) 3 , suggesting that it also consists of mutually perpendicular interlocked honeycomb sheets. Recrystallization by slow diffusion of diisopropyl ether into a methanol solution yielded a porous material of composition Cr(Hbiim) 3 ·2.6C 6 H 14 O in which superposed honeycomb sheets create infinite channels (~13 Å diameter) filled with disordered solvent molecules. A totally different structure is adopted by the solvate Cr(Hbiim) 3 ·C 6 H 6 ·2H 2 O, where the benzene molecule is encapsulated in a cavity created by five complex molecules.Key words: chromium, biimidazole, supramolecular, crystal structure, hydrogen bonding.
    Type of Medium: Online Resource
    ISSN: 0008-4042 , 1480-3291
    URL: Article
    DOI: 10.1139/v06-110
    RVK:
    VA 2870
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 1482256-8
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  • 5
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    Palynological evidence of Holocene climate change in the eastern Arctic: a possible shift in the Arctic oscillation at the millennial time scaleThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network .
    Canadian Science Publishing ; 2008
    In:  Canadian Journal of Earth Sciences Vol. 45, No. 11 ( 2008-11), p. 1363-1375
    Details
    In: Canadian Journal of Earth Sciences, Canadian Science Publishing, Vol. 45, No. 11 ( 2008-11), p. 1363-1375
    Abstract: Dinocyst assemblages and the physical properties of two sediment cores collected in the easternmost part of the main axis of the Northwest Passage, Canadian Arctic Ocean (cores 2004-804-009 BC and 2004-804-009 PC, 74°11.2′N, 81°11.7′W) were used to reconstruct changes in sea-surface conditions and to characterize changes in the depositional environment. Core 2004-804-009 PC spans the last 12 180 calibrated (cal) years BP, with sedimentation rates ranging from 45 to 122 cm/ka. Quantitative estimates of sea-surface parameters reveal relatively large hydrographic variability at millennial time scale. Before 11 000 cal years BP, our records suggest terrigenous inputs related to the last deglaciation. Between 11 000 and 9600 cal years BP, harsh conditions prevailed with August sea-surface temperatures 〈 2 °C and the dominance of heterotrophic taxa. This episode was followed by a gradual increase in the relative abundance of phototrophic taxa and the establishment of milder condition with sea-surface temperature (SST) reaching ∼2 °C ∼8300 cal years BP, possibly related to increased exchange between the Arctic Ocean and the North Atlantic Ocean. From 6000 cal years BP to the late Holocene, climate variability could be the results of changes in the synoptic-scale atmospheric pattern such as the Arctic oscillation.
    Type of Medium: Online Resource
    ISSN: 0008-4077 , 1480-3313
    URL: Article
    DOI: 10.1139/E08-043
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 417294-2
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  • 6
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    Ecology and management of the lobster mushroom in an eastern Canadian jack pine stand
    Canadian Science Publishing ; 2009
    In:  Canadian Journal of Forest Research Vol. 39, No. 11 ( 2009-11), p. 2080-2091
    Details
    In: Canadian Journal of Forest Research, Canadian Science Publishing, Vol. 39, No. 11 ( 2009-11), p. 2080-2091
    Abstract: The lobster mushroom, an organism resulting from the infection of Russula spp. by Hypomyces lactifluorum (Schwein.) Tul. & C. Tul., is common to Canadian boreal forests and has good commercial potential. Within a Pinus banksiana Lamb. stand managed for mushroom production, this study aimed to (1) document carpophore productivity (density, biomass per area) during three seasons, (2) compare productivity among three forest conditions (trails, forest strips between trails, and unmanaged forest), (3) establish ecological parameters related to productivity, and (4) define microhabitats where carpophores are present by using soil and vegetation descriptors. Mushroom density tended to be higher on the trails than under the canopy, but fresh biomass was higher in forest strips except in 2006 when midsummer precipitation was low. Trail management did not increase mushroom production but maintained it during periods of reduced precipitation. Productivity was positively related to the abundance of shade-intolerant plant species and to extractable ammonium, and negatively related to soil pH. Within the present study conditions, microhabitats suitable for the presence of carpophores had low pH, high available phosphorus, low Kalmia angustifolia L. cover, and small canopy gaps with shade-intolerant species. This study was the first step toward understanding the ecology and impacts of forest practices on the lobster mushroom.
    Type of Medium: Online Resource
    ISSN: 0045-5067 , 1208-6037
    URL: Article
    DOI: 10.1139/X09-118
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 1473096-0
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  • 7
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    Synthesis and study of Pt(II)–nitrile complexes. Multinuclear NMR spectra and crystal structures of compounds of the types [Pt(R-CN)Cl 3 ] − and cis and trans -Pt(R-CN) 2 Cl 2
    Canadian Science Publishing ; 1996
    In:  Canadian Journal of Chemistry Vol. 74, No. 2 ( 1996-02-01), p. 144-152
    Details
    In: Canadian Journal of Chemistry, Canadian Science Publishing, Vol. 74, No. 2 ( 1996-02-01), p. 144-152
    Abstract: Complexes of the type [Pt(R-CN)Cl 3 ] − were synthesized and studied by 1 H, 13 C, and 195 Pt NMR spectroscopies. The 2 J( 195 Pt- 13 C) coupling constants are about 240 Hz. The signals due to the cyano carbon atoms of the coordinated ligands were observed at higher fields than those of the free ligands. The shielding on the cyano carbon increases as the alkyl chain lengthens and also when the branching increases. The 195 Pt signals of all the complexes were observed around −2000 ppm. The crystal structures of (NMe 4 )[Pt(C 3 H 7 -CN)Cl 3 ] (1) and (NMe 4 )[Pt(p-HO-C 6 H 4 -CN)Cl 3 ] (2) were determined. Compound 1 is monoclinic, P2 1 /c, a = 8.384(5), b = 15.336(19), c = 11.759(9) Å, β = 99.52(6)°, Z = 4, R = 0.054, and wR = 0.051. Crystal 2 is tetragonal with a = 16.222(6), c = 12.052(5) Å, Z = 8, R = 0.059, and wR = 0.044. The Pt—CL bond trans to the nitrile ligand is shorter than normal (2.276(3) Å for 1 and 2.264(7) Å for 2) while the two other bonds are normal (2.293(4), 2.287(3) Å for 1 and 2.320(7), 2.275(8) Å for 2). The Pt—N bonds are 1.97(1) Å (1) and 1.92(2) Å (2) and the segments Pt-N≡C-C are linear. Disubstituted compounds were also synthesized and studied by multinuclear NMR. The 195 Pt signals of the cis isomers were observed at lower fields than those of the trans isomers (Δ ≈ 65 ppm), while the 13 C signals of the cyano carbons of the trans isomers were observed at lower fields than those of the cis compounds (Δ ≈ 0.6 ppm). The cis complexes isomerize to the trans compounds upon heating. The crystal structures of cis-(3) and trans-Pt(C 2 H 5 -CN) 2 Cl 2 (4) and also of cis-Pt(p-HO-C 6 H 4 -CN) 2 Cl 2 (5) were determined. Crystal 3 is monoclinic, P2 1 /c, a = 7.506(5), b = 9.539(5), c = 14.823(7) Å, β = 92.31(4)°, Z = 4, R = 0.050, and wR = 0.042. The trans isomer 4 is monoclinic with the Pt atom on an inversion centre, P2 1 /c, a = 5.149(4), b = 9.394(8), c = 10.944(10) Å, β = 97.84(7)°, Z = 4, R = 0.017 and wR = 0.020. Finally, compound 5 is triclinic, P-1, a = 7.464(3), b = 10.712(6), c = 12.291(5) Å, α = 75.63(4)°, β = 75.63(4)°, γ = 80.32(4)°, Z = 2, R = 0.045, and wR = 0.056. The Pt—Cl bond distances for the cis isomers are 2.269(5), 2.270(4) Å for 3 and 2.274(2), 2.279(3) Å for 5 while they are 2.289(3) Å for the trans isomer (4). The Pt—N bonds are 1.962(14), 1.988(11) Å (3), 1.972(7), 1.976(7) Å (5) and 1.969(5) Å for 4. Key words: platinum, nitrile, NMR, isomerization, crystal structure.
    Type of Medium: Online Resource
    ISSN: 0008-4042 , 1480-3291
    URL: Article
    DOI: 10.1139/v96-018
    RVK:
    VA 2870
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1996
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  • 8
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    Synthesis, characterization, and crystal structures of novel oligomeric Zn(II) and Cd(II) complexes with N , N ′-dimethyl-2,2′-biimidazole
    Canadian Science Publishing ; 2007
    In:  Canadian Journal of Chemistry Vol. 85, No. 7-8 ( 2007-07-01), p. 520-533
    Details
    In: Canadian Journal of Chemistry, Canadian Science Publishing, Vol. 85, No. 7-8 ( 2007-07-01), p. 520-533
    Abstract: Zn(II) and Cd(II) complexes with N,N′-dimethyl-2,2′-biimidazole (Me 2 biim) were synthesized and characterized by IR spectroscopy and by X-ray crystallographic methods. The reaction of zinc perchlorate with Me 2 biim produced the dinuclear compound [(Me 2 biim)Zn(µ-Me 2 biim) 3 Zn(Me 2 biim)](ClO 4 ) 4 , containing two monodentate and three bridging Me 2 biim ligands bonded to Zn atoms in a distorted tetrahedral environment. A related neutral (NO 3 ) 2 Cd(µ-Me 2 biim) 3 Cd(NO 3 ) 2 complex, containing only bridging Me 2 biim ligands, was also synthesized, in which the distorted octahedral coordination of each Cd atom is completed by one monodentate and one bidentate nitrato ligand. Two ionic trinuclear Cd compounds were also obtained, which include two sets of three bridging Me 2 biim ligands connecting a central Cd atom to two terminal Cd centers. An extra Me 2 biim ligand is chelated to each terminal metal, and the sixth coordination site is occupied by water molecules in the symmetric [(Me 2 biim)(H 2 O)Cd(µ-Me 2 biim) 3 Cd(µ-Me 2 biim) 3 Cd(H 2 O)(Me 2 biim)](ClO 4 ) 6 complex, whereas the aqua ligand is replaced by methanol at one of the terminal units in the non-symmetric [(Me 2 biim)(H 2 O)Cd(µ-Me 2 biim) 3 Cd(µ-Me 2 biim) 3 Cd(CH 3 OH)(Me 2 biim)](ClO 4 ) 6 compound. In the chelating ligands, dihedral angles of ~38° between the two imidazole rings reduce repulsion between the N-methyl groups, but considerable strain remains, as evidenced from one of the Cd–N bonds being much longer than the other. In the various compounds, dihedral angles of 60–80° are found between the imidazole rings in the bridging ligands, and intramolecular inter-ligand π–π stacking contributes to stabilization.Key words: zinc, cadmium, dimethylbiimidazole, crystal structure, dinuclear, trinuclear.
    Type of Medium: Online Resource
    ISSN: 0008-4042 , 1480-3291
    URL: Article
    DOI: 10.1139/v07-061
    RVK:
    VA 2870
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2007
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  • 9
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    Ecology and productivity of Cantharellus cibarius var. roseocanus in two eastern Canadian jack pine stands
    Canadian Science Publishing ; 2011
    In:  Botany Vol. 89, No. 10 ( 2011-10), p. 663-675
    Details
    In: Botany, Canadian Science Publishing, Vol. 89, No. 10 ( 2011-10), p. 663-675
    Abstract: Despite the economic importance of chanterelles, much remains to be known about their habitat requirements. Cantharellus cibarius var. roseocanus Redhead, Norvell & Danell sporocarp productivity was measured during three growing seasons in two Pinus banksiana Lamb. stands of boreal forest. The objective was to determine how the variability in stand, plant association, edaphic, and meteorological conditions was related to sporocarp productivity. DNA of this species was detected in organic and mineral soil horizons. Sporocarp productivity was similar for both stands, but the absence of colonies on trails at one of the sites likely reflects microenvironmental conditions that are unsuitable for chanterelle growth. Under the prevailing site conditions, preferred microhabitats were characterized by high stand density, high C:N ratio, and frequent moss presence. The Solidago puberula Nutt. – Comptonia peregrina (L.) Coulter – Pinus banksiana association, lichen presence, and as much clay and silt content as can possibly be found on this moderately acidic sandy soil favoured the productivity of this chanterelle, whereas ericaceous species presence was negatively correlated with chanterelle productivity. Positive correlations were found between total rainfall 1 week prior to fructification, air temperature 2 weeks prior to fructification, and sporocarp productivity. Results highlight the specific conditions favourable to Cantharellus cibarius var. roseocanus fructifications within these stands.
    Type of Medium: Online Resource
    ISSN: 1916-2790 , 1916-2804
    URL: Article
    DOI: 10.1139/b11-058
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2011
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  • 10
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    Coastal ship traffic: a significant introduction vector for potentially harmful dinoflagellates in eastern Canada
    Canadian Science Publishing ; 2012
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 69, No. 4 ( 2012-04), p. 627-644
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 69, No. 4 ( 2012-04), p. 627-644
    Abstract: We examined the risk of introduction associated with potentially toxic or otherwise harmful algae (HA) or nonindigenous species (NIS) of dinoflagellates in ballast water from 63 commercial ships visiting ports of eastern Canada in 2007–2009. Ship categories included transoceanics undergoing ballast water exchange (BWE) and coastal ships with or without BWE. Of 159 species of dinoflagellates observed in Lugol-preserved samples, 15 were potential HA (six Dinophysis spp.) and 46 were NIS (including three HA). We found at least one species of HA in 81% of all ships examined, and maximum cell concentrations reached nearly 4000 cells·L –1 . Coastal nonexchanged tankers carried the greatest cell concentrations of HA. NIS dinoflagellates were found in 56% of ships, significantly more in ships with BWE. There was no evidence that ships with BWE contained significantly fewer taxa or lower concentrations of HA dinoflagellates, indicating that BWE is not efficient in controlling the introduction of these organisms. In fact, BWE promoted the transport of NIS dinoflagellates, possibly because of the wide distribution of several of these species. Coastal ship traffic is a significant introduction pathway for HA (ships with and without BWE) and NIS (ships with BWE) dinoflagellates in eastern Canada.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f2012-008
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2012
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