Arctic Cod, Boreogadus saida (Lepechin 1774) occur throughout the circumpolar north at all levels of the water column depending on their life history stage, the time of day, the season, and their activity. Arctic Cod are the most abundant fish species in the Canadian Beaufort Sea (CBS) ecosystem, and are an important link in the flow of energy within the food web. This study examined differences in energy acquisition and usage in Arctic Cod among three depth zones in the CBS (from 15-800m) by examining stomach contents and physiological indicators, taking into account sex, age and body size. Nonparametric comparison analyses found no differences with depth, but support for an ontogenetic shift in diet regarding prey size, a difference in energy content of an average diet between size classes 1 (30-60mm) and 2-4 (2: 60-90mm; 3: 90-120mm; 4: >120mm), and a slight positive relationship between physiological indicators and body size. / October 2016

Canadas Beaufort Sea-Mackenzie Delta Basin possesses significant energy resource potential. Decisions about energy development, however, are largely project-based and do not always provide an opportunity for more efficient and more effective regional and strategic approaches to development impact assessment and management. As such, there are constant messages about the need for a more regional and strategic form of environmental assessment, practiced above the project level and focused on broader planning-based assessment as a means to sustainability assurance. The problem, however, is that there is no formal system of regional or strategic assessment (R-SEA) in northern Canada, and considerations as to what R-SEA is and what it should deliver are far from consolidated. The role of R-SEA must be better understood and a means found to make it a meaningful component and accepted and worthwhile part of planning, regulation and development decision-making. The purpose of this thesis is to identify stakeholder understandings and expectations about R-SEA, and its potential roles and opportunities in Arctic energy planning and assessment. Data were collected using semi-structured interviews with knowledgeable stakeholders in Arctic oil and gas initiatives, including energy regulators, industry, and energy interest groups, as well as Inuvialuit governments and community boards. Four key themes are identified and discussed: the efficacy of the current approach to environmental assessment for offshore energy development; knowledge of R-SEA; RSEA benefits and risks; and opportunities and challenges to advancing R-SEA in the Inuvialuit Settlement Region (ISR). Only consultation and engagement was seen by most participants as working well within the current EA system in the study area. Many challenges were raised, however, which would indicate a need for a new or revised approach to EA in the study area. There was agreement on the need for a more regional and strategic approach to EA in the ISR, but there was no consensus amongst participants as to the nature and scope of R-SEA and what it is intended to deliver. Though there continues to be much confusion regarding the terminology used, it appears that participants are identifying the same deliverables and advantages, suggesting that they are looking for similar benefits. Challenges to moving such a process forward include leadership, coordination of interests, financial resources, legislated versus voluntary approaches, and human capacity in the ISR region. Future research is needed to address the perceived risks and challenges raised by participants for R SEA to be a worthwhile and effective process.

Canadas Beaufort Sea-Mackenzie Delta Basin possesses significant energy resource potential. Decisions about energy development, however, are largely project-based and do not always provide an opportunity for more efficient and more effective regional and strategic approaches to development impact assessment and management. As such, there are constant messages about the need for a more regional and strategic form of environmental assessment, practiced above the project level and focused on broader planning-based assessment as a means to sustainability assurance. The problem, however, is that there is no formal system of regional or strategic assessment (R-SEA) in northern Canada, and considerations as to what R-SEA is and what it should deliver are far from consolidated. The role of R-SEA must be better understood and a means found to make it a meaningful component and accepted and worthwhile part of planning, regulation and development decision-making. The purpose of this thesis is to identify stakeholder understandings and expectations about R-SEA, and its potential roles and opportunities in Arctic energy planning and assessment. Data were collected using semi-structured interviews with knowledgeable stakeholders in Arctic oil and gas initiatives, including energy regulators, industry, and energy interest groups, as well as Inuvialuit governments and community boards. Four key themes are identified and discussed: the efficacy of the current approach to environmental assessment for offshore energy development; knowledge of R-SEA; RSEA benefits and risks; and opportunities and challenges to advancing R-SEA in the Inuvialuit Settlement Region (ISR). Only consultation and engagement was seen by most participants as working well within the current EA system in the study area. Many challenges were raised, however, which would indicate a need for a new or revised approach to EA in the study area. There was agreement on the need for a more regional and strategic approach to EA in the ISR, but there was no consensus amongst participants as to the nature and scope of R-SEA and what it is intended to deliver. Though there continues to be much confusion regarding the terminology used, it appears that participants are identifying the same deliverables and advantages, suggesting that they are looking for similar benefits. Challenges to moving such a process forward include leadership, coordination of interests, financial resources, legislated versus voluntary approaches, and human capacity in the ISR region. Future research is needed to address the perceived risks and challenges raised by participants for R SEA to be a worthwhile and effective process.

Of the maritime boundaries yet to be delimited between Canada and the United States, the Beaufort Sea might be the more pressing one, considering its strategic location in a rapidly developing Arctic region and its vast economic potential. In accordance with the Law of the Sea Convention (UNCLOS), maritime boundaries are to be delimited by agreement on the basis of international law as referred to in Article 38 of the Statute of the International Court of Justice, in order to reach an equitable solution. When an agreement cannot be reached, parties can resort to third-party arbitration. While jurisprudence has determined that international law does not mandate a particular method of delimitation, it requires the consideration of equitable principles, also called special circumstances or factors. The notion of equity is therefore the foundation of boundary determination. But, what is equity and how is it applied? This thesis examines the various forms of equity, their origins in legal philosophy and domestic law and how they have been incorporated in international law. The main focus, however, is to analyse the differences between how international tribunals or courts have interpreted and applied equity in boundary determination and how States have applied it in negotiated agreements. While tribunals have tended to consider equitable principles as equivalent to geographical proportionality, States have considered those principles more in keeping with the notion of distributive justice and, more and more, are taking a globalised approach to boundary determination. On the basis of this analysis, this thesis evaluates the potential outcome of a third-party arbitration of the Beaufort Sea boundary dispute between Canada and the United States as well as the options for settlement negotiations between the Parties. In the Beaufort Sea area where hydrocarbon development is intrinsically linked not only to the development of the local population but also to the entire Arctic region, be it on issues related to the environment, navigation or security, the thesis concludes that a third-party adjudication would not serve the interests of the States. As delimiting boundaries nowadays is only one aspect of the management of oceans related issues, interests are best served when delimitation is understood as part of this global approach.

Of the maritime boundaries yet to be delimited between Canada and the United States, the Beaufort Sea might be the more pressing one, considering its strategic location in a rapidly developing Arctic region and its vast economic potential. In accordance with the Law of the Sea Convention (UNCLOS), maritime boundaries are to be delimited by agreement on the basis of international law as referred to in Article 38 of the Statute of the International Court of Justice, in order to reach an equitable solution. When an agreement cannot be reached, parties can resort to third-party arbitration. While jurisprudence has determined that international law does not mandate a particular method of delimitation, it requires the consideration of equitable principles, also called special circumstances or factors. The notion of equity is therefore the foundation of boundary determination. But, what is equity and how is it applied? This thesis examines the various forms of equity, their origins in legal philosophy and domestic law and how they have been incorporated in international law. The main focus, however, is to analyse the differences between how international tribunals or courts have interpreted and applied equity in boundary determination and how States have applied it in negotiated agreements. While tribunals have tended to consider equitable principles as equivalent to geographical proportionality, States have considered those principles more in keeping with the notion of distributive justice and, more and more, are taking a globalised approach to boundary determination. On the basis of this analysis, this thesis evaluates the potential outcome of a third-party arbitration of the Beaufort Sea boundary dispute between Canada and the United States as well as the options for settlement negotiations between the Parties. In the Beaufort Sea area where hydrocarbon development is intrinsically linked not only to the development of the local population but also to the entire Arctic region, be it on issues related to the environment, navigation or security, the thesis concludes that a third-party adjudication would not serve the interests of the States. As delimiting boundaries nowadays is only one aspect of the management of oceans related issues, interests are best served when delimitation is understood as part of this global approach.

Thesis (M.A.)--Boston University / Introduction The purpose of the thesis is; to develop and explain the location and extent of sea ice in the Beaufort Sea, and to describe methods in use and proposed by the science of ice forecasting to aid ship movements in the area. Much of the data in the thesis camas from unpublished or widely scattered papers, and the thesis is an attempt to assimilate such data into cohesive form. Chapter I. The Newly Acquired Importance of the Beaufort Sea Region and the Status of Ice Forecasting. Prior to World War II the area of the Beaufort Sea was little known or exploited. A few explorers occasionally had joined the native eskimos as inhabitants of the area. After the war, a program of oil exploration was undertaken on the southern shores of the Sea by the U.S. Navy. Discovery of oil and the newly feasible means of making trans-polar flights across the Arctic waters suddenly catipulated the area into a position of strategic importance to our national defense. Research programs devoted to gathering data on how to live in such a hostile climate bacame a natural outgrowth of this new importance. With the construction and resupply of the DEW line a vital necessity, methods of coping with sea ice had to be developed. In this respect, the Russians were far advanced over the Western Allies, having devoted much time and effort on the problem since the 1920's. Nonetheless, U.S. and Canadian scientists, under an accelerating research program, are well on the way to equality in the fields surrounding sea ice research. [TRUNCATED]

Loss of sea ice due to global warming may affect the phenology and distribution of polar bear (Ursus maritimus) denning by altering access to denning habitats. We examined trends in the selection of maternal denning substrate (land versus sea-ice denning) in the southern Beaufort Sea (SB), addressing the potential influence of summer land-use and fall sea-ice conditions on substrate selection. We developed an algorithm based on statistical process control methods to remotely identify denning bears and estimate denning phenology from temperature sensor data collected on collars deployed 1985–2013 in the SB and Chukchi Sea (CS). We evaluated cub survival relative to den entrance, emergence, and duration, and examined differences in the phenology of land and sea-ice dens. Land denning in the SB was more common during years when ice retreated farther from the coast and off of the continental shelf in September. All SB bears that occupied land prior to denning subsequently denned on land; however, only 29% of denning bears that summered on sea ice denned on land. Den entrance and duration in the SB and CS were similar, although CS bears emerged later. Land dens were occupied longer than those on ice. Bears later observed with cubs remained in dens 23 days longer and emerged from denning 17 days later on average than bears that denned but were subsequently observed without cubs, suggesting that den exit dates are related to cub survival. The increase in land-based denning in the SB when sea ice retreated farther from shore, along with the positive correlation between fall land-use and land denning, suggest that further sea-ice declines may result in continued increases of onshore denning. Growing numbers of denning females along the coast may increase the potential for human-bear interactions.

Polar bears (Ursus maritimus) are experiencing rapid and substantial changes to their environment due to global climate change. Polar bears of the southern Beaufort Sea (SB) have historically spent most of the year on the sea ice. However, recent reports from Alaska indicate that the proportion of the SB subpopulation observed onshore during late summer and early fall has increased considerably. Previous research suggests that the number of polar bears onshore is linked to sea ice conditions and the availability of subsistence-harvested whale carcasses, which are referred to as bone piles. My objectives were to determine the development and fitness consequences for SB polar bears that come onshore. Furthermore, I aimed to reveal the number of polar bears that come onshore and feed at whale carcasses. I used a combination of genetic and behavioral data collected on SB polar bears from 2010-2013 to determine if onshore behavior developed through genetic inheritance, asocial learning, or social learning. I found that onshore behavior was primarily transmitted via mother-offspring social learning. I used hair samples collected at bone piles near Kaktovik, Alaska from 2011-2014 and genetic capture-recapture techniques to estimate the annual number of polar bears that visited the bone piles and rates of apparent site fidelity to the bone pile. I estimated that as many as 146 (SE = 21) SB polar bears visited the bone piles near Kaktovik in 2012. Annual rates of apparent site fidelity to the bone pile for male polar bears ranged from 0.60 (SE = 0.07) to 0.61 (SE = 0.07), and female rates of apparent site fidelity was 0.69 (SE = 0.19). Lastly, I used quantitative fatty acid signature analysis to estimate the proportion of bowhead whale, ringed seal, bearded seal, and beluga whale in the diets of SB polar bears from 2004-2015. I revealed that polar bears achieved higher body condition by coming onshore and feeding at whale carcasses. Overall, my results indicated that SB polar bears are socially learning from their mother to come onshore and that this behavior is linked to increased body condition.

Planning for offshore hydrocarbon development in Canada’s Beaufort Sea currently occurs on a project-by-project basis. This is despite a collective understanding that impact assessment should go beyond the evaluation of site-specific project impacts to consider the broader policy and regional planning context in which development projects operate. The need for such a regional and strategic approach to impact assessment in Canada’s Beaufort Sea, known as regional strategic environmental assessment (R-SEA), arises from the looming large-scale offshore hydrocarbon development in the region and the lack of a mechanism to plan for future energy development, establish a long-term regional vision, or assess and effectively manage the potential cumulative environmental and social effects arising from development. At such a critical moment, little research exists to advance R-SEA from a concept to an applied planning, assessment and decision-support process. This dissertation draws on experience from the implementation of strategic environmental assessment in offshore jurisdictions internationally, along with existing initiatives for marine planning in the Beaufort Sea, to advance effective R-SEA implementation in the region. The research methodology includes a literature review, case reviews and key informant interviews. The research results are reported in three manuscripts. The first manuscript examines the influence of R-SEA on planning and development decisions in Norway, Atlantic Canada and the UK. The second manuscript examines existing planning, assessment, and science initiatives in the Beaufort Sea. The third manuscript identifies key opportunities for, and challenges to, the implementation of R-SEA in the Beaufort Sea. Significant findings demonstrate that R-SEA can offer a much-needed framework to accommodate and address stakeholder issues and concerns regarding future offshore development in the Beaufort Sea, despite acute implementation challenges, such as scepticism of scenario-based planning. Key findings reveal many expectations of what R-SEA could deliver in the Beaufort Sea, a result of the varied stakeholder priorities and goals. Understanding the root of different expectations and perceptions, ensuring follow-up programs pay attention to horizontal linkages between R-SEA strategies and current marine planning initiatives, and that supporting institutional arrangements are in place for a preferred strategy to succeed lie at the core of advancing R-SEA as a viable tool in the Arctic.

The Chukchi and Beaufort Sea shelves host diverse and productive seafloor ecosystems important for carbon and nitrogen cycling for the Arctic Ocean. The benthic food web transfers energy from primary producers to high trophic level organisms (e.g., birds, fish, and mammals), which are important for cultural practices and subsistence hunting by Native Alaskans. This work focuses on the trophic ecology of arctic food webs through use of several different approaches. First, variation in the natural abundance of stable carbon and nitrogen isotopes facilitated the identification of trophic pathways and, subsequently, allowed the comparison of trophic guilds and food webs from the Chukchi and Beaufort Seas. Compared to water column and sedimentary organic matter end-members, second trophic level grazers and suspension feeders were conspicuously ¹³C-enriched throughout the Chukchi Sea, which supports the hypothesis that microbial degradation of organic matter occurred prior to metazoan assimilation. Second, food web recovery from disturbances caused by exploratory oil drilling at the seafloor that had occurred approximately 20 years prior were assessed in both the Chukchi and Beaufort Seas. Based on isotopic trophic niche overlap between organisms common to drilled and reference sites in the Chukchi and Beaufort Seas, the oil drilling sites had similar food web structure, indicating recovery from the activity associated with the drilling process. Third, photosynthetic pigment biomarkers were used to better understand the diagenetic process, specifically focusing on how both microbial and metazoan grazing pathways degrade organic matter in relation to seasonal sea ice retreat in the Chukchi Sea. The benthic macrofaunal and microbial food web caused rapid degradation of organic matter upon the initial pulse of microalgal food sources to the seafloor. These diagenetic pathways are linked to the ¹³C-enrichment of residual organic matter, which corresponds to the stable isotope values measured in the benthic macrofauna. Lastly, high-precision liquid chromatography and spectrophotometry were compared for estimating sedimentary pigments in the marine environment. Substantial differences in pheopigment (chlorophyll degradation products) concentrations were observed between the two techniques, suggesting the need for revisions to the monochromatic spectrophotometric equation that relates absorbance to pigment concentrations. One pheopigment, pheophorbide, was found to interfere with the accuracy of the spectrophotometric equation and caused the overestimation of pheopigments. / text