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Les éléments du groupe du platine (EGP) peuvent s’avérer très utiles pour aborder certains processus pétrogénétiques et géochimiques ayant affecté le manteau terrestre. Les péridotites mantelliques et certaines roches intrusives provenant de la section mantellique du Massif North Arm Mountain (MNAM) (Complexe Ophiolitique de Bay of Islands, Terre-Neuve) ainsi que de la Faille Transformante Garrett (FTG) ont fait l’objet d’une détermination des teneurs en Ir, Ru, Rh, Pt et Pd par spectrométrie de masse à émission de plasma. Ces données sur les teneurs en EGP ont été obtenues grâce à une méthode d’extraction et de dosage récemment mise au point.... / Québec Université Laval, Bibliothèque 2019

Climate variability in the North Atlantic has been linked in part to the North Atlantic Oscillation (NAO). The NAO influences marine ecosystems in the northwestern Atlantic and the transport variability of the cold Labrador Current (LC). Understanding historic patterns and predicting future changes in LC transport require long-term and high-resolution climate records that are not available from instrumental data sets. This thesis presents the first century-scale sea surface temperature (SST)reconstructions from the Northwestern Atlantic using Mg/Ca ratios in the long-lived crustose coralline algae Clathromorphum compactum. which is characterized by a high Mg-calcite skeleton exhibiting annual growth increments. Results indicate strong correlations between interannual variations in Mg/Ca ratios and instrumental SST. The 131-year algal Mg/Ca record reveals NAO-type periodicities and evidence of past cold events and warming periods associated with basin-wide ecosystem shifts. Negative correlations between LC volume transport and algal Mg/Ca reflect the cooling influence of the LC on eastern Canadian shelf ecosystems.

Climate variability in the North Atlantic has been linked in part to the North Atlantic Oscillation (NAO). The NAO influences marine ecosystems in the northwestern Atlantic and the transport variability of the cold Labrador Current (LC). Understanding historic patterns and predicting future changes in LC transport require long-term and high-resolution climate records that are not available from instrumental data sets. This thesis presents the first century-scale sea surface temperature (SST)reconstructions from the Northwestern Atlantic using Mg/Ca ratios in the long-lived crustose coralline algae Clathromorphum compactum. which is characterized by a high Mg-calcite skeleton exhibiting annual growth increments. Results indicate strong correlations between interannual variations in Mg/Ca ratios and instrumental SST. The 131-year algal Mg/Ca record reveals NAO-type periodicities and evidence of past cold events and warming periods associated with basin-wide ecosystem shifts. Negative correlations between LC volume transport and algal Mg/Ca reflect the cooling influence of the LC on eastern Canadian shelf ecosystems.

Background: Food nourishes us, sustains us, and has the potential to both heal us and make us sick. Among many Indigenous cultures, traditional activities, ceremonies, events and practices often involve or use food, grounding Indigenous peoples within the context of their local, natural surroundings. This suggests that food is important not only for physical health, but also emotional, mental and spiritual health. The relationships that Indigenous peoples have with food can help us to understand the health of individuals, and the communities in which they live. Purpose: The following qualitative study explores how three generations of adults who live in one Labrador Inuit-Metis community experience and understand their relationships to food in a context of global change. Theoretical Orientation: The research is guided by Two-Eyed Seeing. Two-Eyed Seeing acknowledges that there are many different ways of seeing and understanding the world, some of which can be encompassed through a Western eye and some through an Indigenous eye. If we learn to see through both eyes, we can gain a perspective that looks very different than if we only view the world through a single lens. Methods: For the study, twenty-four people from the south-eastern Labrador community of St. Lewis participated in individual and joint story-telling sessions. A group story-telling session also took place where community members could share their stories with one another. During many of the story-telling sessions, participants shared photographs, which helped to illustrate their relationships to food. Findings/Discussion: Historically, the people of St. Lewis relied almost entirely upon their own wherewithal for food, with few, if any, government services available and very little assistance from the market economy. This fostered and upheld an Inuit-Metis culture that promoted sharing, reciprocity and respect for the natural world. Currently, greater access to government services and the market economy has led to the creation of certain policies and programs that undermine or ignore established social and cultural norms in the community. Conclusions: Existing Inuit-Metis knowledge should work alongside non-Indigenous approaches to policy and program development. This would serve to protect and promote the health of both individuals and communities.

Le présent mémoire est consacré à l'étude des relations économiques qu'ont entretenues les Naskapis de l'Ungava-Labrador et la Compagnie de la Baie d'Hudson (CBH) durant la période allant de 1830 et 1870. Il cherche plus précisément à identifier les stratégies utilisées par la compagnie pour développer son commerce dans la région et à dégager leurs effets sur les pratiques économiques des Naskapis. S'inscrivant dans le cadre des travaux qui, depuis les années 1970, cherchent à cerner les impacts du commerce des fourrures sur les populations autochtones, notre étude éclaire aussi certaines facettes de l'histoire des Naskapis (formation et transformation des bandes régionales, modalités d'occupation du territoire, comportements économiques des chasseurs, etc.) Nous avons adopté une perspective territoriale sur le commerce des fourrures. Cette approche s'inspire de travaux qui ont mis en évidence les rapports étroits entre le territoire et les manifestations économiques. Deux postulats sont à la base de notre étude: 1) que la géographie et la distribution des ressources déterminent en grande partie les variations régionales des manifestations du commerce des fourrures; 2) que les rapports des populations avec le territoire constituent des paramètres essentiels à la compréhension de ces manifestations. Les sources sont constituées pour l'essentiel des Archives de la Compagnie de la Baie d'Hudson (HBCA). Nous avons privilégié une approche diversifiée de la documentation afin de maximiser les perspectives d'interprétation. En plus des informations qualitatives, tirées principalement de la correspondance et des rapports des commis de la compagnie, nous avons traité des données «brutes» et quantitatives contenues dans les journaux de poste et les livres de compte. Nos conclusions soutiennent que les relations entre la CBH et les Naskapis ne correspondent pas au modèle d'interdépendance économique, plus ou moins égalitaire mais somme toute positif, décrit dans plusieurs études régionales récentes. L'économie des Naskapis s'est plutôt développée dans un contexte de contraintes économiques et territoriales imposées par la compagnie pour atteindre ses objectifs de rentabilité. Nous faisons ressortir que les restrictions imposées sur la mobilité des Naskapis n'ont pas favorisé le développement de leur propre modèle économique adapté aux conditions biophysiques régionales. ______________________________________________________________________________ MOTS-CLÉS DE L’AUTEUR : Naskapis, Histoire amérindienne, Commerce des fourrures, Compagnie de la Baie d'Hudson.

Using a combination of hydrographic data and the trajectories and profiles of isobaric floats, this dissertation evaluates the connections between remote regions in the North Atlantic. First, I establish that the production and advection of the North Atlantic Subtropical Mode Water (STMW) introduces spatial and temporal variability in the subsurface nutrient reservoir of the subtropical gyre. As the mode water is formed, its nutrients are depleted by biological utilization. When the depleted water mass is exported to the gyre, it injects a wedge of low-nutrient water into the upper layers of the ocean. Contrary to intuition, cold winters that promote deep convective mixing and vigorous mode water formation may diminish downstream primary productivity by altering the subsurface delivery of nutrients. Next, the source of elevated nutrient concentrations in the Gulf Stream is assessed. The historical hydrographic data suggest that imported water advected into the Gulf Stream via the tropics supplies an important source of nutrients to the Gulf Stream. Because the high nutrients are likely imported from the tropics, diapycnal mixing need not be invoked to explain the Gulf Stream's high nutrient concentrations, as had been previously hypothesized. Furthermore, nutrients do not increase along the length of the Stream, as would be expected with strong diapycnal mixing.Finally, profiling float data are used to investigate how the Labrador Sea Water enters the Deep Western Boundary Current, one of the primary pathways by which it exits the subpolar gyre. With the trajectories and profiles of an extensive array of P-ALACE floats I evaluate three processes for their role in the entry of Labrador Sea Water in the Deep Western Boundary Current (DWBC): 1) LSW is formed directly in the DWBC, 2) Eddies flux LSW laterally from the interior Labrador Sea to the DWBC, and 3) A horizontally divergent mean flow advects LSW from the interior to the DWBC. Each of the three processes has the potential to remove heat from the boundary current, and both the formation of LSW directly in the boundary current and the eddy heat flux are possible sources of interannual variability in the exported LSW product. / Dissertation

This research assesses whether a refinement of the temporal resolution of tree-ring data can improve our understanding of the radial growth-climate relationship. Two study sites in Northern Labrador were chosen, one coastal (Nain), and the other inland (Kamestastin). In Nain, microcore samples were taken weekly from the same five white spruce (Picea glauca) trees over the 2014 growing season. After cross sections were made and stained, the resulting 10µm thin radii provided a direct view of active ring development. In coastal Labrador, radial growth was initiated during the last week of June 2014, and ceased by August 25th. Circumference band dendrometers were installed on white spruce trees at both the Nain and Kamestastin sites. The dendrometers were used to measure micrometre-scale changes over the 2014 growing season. Analogous records of temperature were collected with equal temporal resolution, from an Environment Canada climate station (#8502800), and via a programmable data logger (UX120-006M, Onset HOBO). Correlation function analysis determined the relationship between daily temperature variables and daily variations in stem size. A strong relationship was found between minimum daily temperature and daily stem size at both sites over the eight week long growing season. Traditional dendrochronological sampling methods were utilized to retrieve tree cores from white spruce and eastern larch (Larix laricina) in Nain and Kamestastin. Site-specific master growth chronologies were created using crossdating and standardization techniques. After establishing long term records of monthly temperature and accumulated growing degree-days (GDD) at both study sites, a linear regression analysis was undertaken to determine the suitability of these two variables as predictors of annual-radial growth. An accumulated June/July GDD index was identified as an overall better predictor of annual ring-width than mean monthly temperature variables in northern Labrador. Exploring radial growth on an intra-annual scale helped to improve our understanding of the complex radial growth-climate relationship in Labrador. This allows for a strengthening of tree rings as a proxy climate indicator in remote regions of the northern boreal forest. The findings from this thesis provide the tools necessary to improve upon long-term climate reconstruction and forecasts of boreal forest structure in the face of climate change.

This paper examines the changing nature of provincial constitutions in Canada. Provinces are granted the right to have their own constitutions by Sections 58-90 of the Constitution Act, 1867, and various sections of the Constitution Act, 1982. The substance of provincial constitutions includes various Acts of provincial parliaments, long-standing constitutional conventions, unwritten rules and principles and common law. With respect to the practice of responsible government, the provinces have long relied on the traditionally “flexible” nature of their largely unwritten constitutions. Using the case studies of statutes dealing with the executive and legislative branches of government in the provinces of British Columbia, Quebec, and Newfoundland and Labrador, this paper analyzes recent changes in the statutes (and therefore constitutions) of the provinces. The analysis shows that there have been many changes in provincial constitutions on the subject of responsible government. The constitutions increasingly recognize the role of the Premier and cabinets, to the detriment of the traditional roles of Lieutenant Governors and the legislatures. This is in line with general trends in Canada’s provinces toward increased executive dominance. The practice of codifying changes in provincial constitutions is also more in line with how constitutional change happens in the states of comparable federations such as Australia and the United States.