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Fisheries for arctic freshwater and diadromous fish species contribute significantly to northern economies. Climate change, and to a lesser extent increased ultraviolet radiation, effects in freshwaters will have profound effects on fisheries from three perspectives: quantity of fish available, quality of fish available, and success of the fishers.(More)
In this study, the magnitude and direction of gene flow and estimates of effective population sizes (N(e) ) were quantified among two life-history types (lacustrine and anadromous) of broad whitefish Coregonus nasus in the lower Mackenzie River system. The data suggest that dispersal and subsequent gene flow occurs between these groups, with the former(More)
Physicians were surveyed in Northwestern Pennsylvania to examine how they viewed their relationships with pharmaceutical sales representatives (PSR) and the pharmaceutical industry. Physicians viewed the PSR as an important source of information, but felt that they could get needed information from other sources without the PSR's assistance. Physicians also(More)
Physicians in northwestern Pennsylvania were surveyed to identify the factors that influenced their attitudes toward pharmaceutical sales representatives (PSRs). The results suggest that physicians' attitudes were influenced by the information and educational support they received from PSRs, selling techniques used by the PSRs to promote their products, and(More)
Assessments of fine-scale population structure in natural populations are important for understanding aspects of ecology, life history variation and evolutionary history and can provide novel insights into resource management. Although Arctic char, Salvelinus alpinus, represent one of the most culturally and commercially important salmonids in the Canadian(More)
Three populations of Arctic charr Salvelinus alpinus from southern Baffin Island were previously identified to display variable migratory phenotypes, with an anadromous component of the population and another remaining resident in fresh water. In this study, 14 microsatellite markers were used to help distinguish between two alternative hypotheses to(More)
Charr populations are particularly susceptible to change, either from the application of harvest or environmental conditions such as climate variation. As an alternative to conventional fishery analysis, we analyze the sustainability and viability of selected North American charr stocks using a number of approaches. We compare several methods for data(More)
Pearl dace, Semotilus margarita, are common in slow-moving channels and pools of the headwaters of the Brokenhead River. From May to September age groups 0, 1 and 2+ were partially segregated in space based on water depth with age 0 occupying shallow pools and shallow channels. Age 1 were abundant in shallow pools and deep channels while age 2+ occurred in(More)
A recent paper by L'Abée-Lund & Vøllestad (1985) discussed the importance of environmental predictability in the evolution of natal stream homing in fishes. While we agree that there is a relationship between predictability and homing, we dispute the authors' contention that fall spawning fishes home more frequently than spring spawners. We also challenge(More)
The Arctic charr Salvelinus alpinus is a diverse and abundant resource in Canada's Nunavut. The anadromous form is primarily targeted by exploitation in small-scale fisheries. The continued importance of subsistence fisheries and growing interest in further developing commercial fisheries underline the need for proper management of S. alpinus in northern(More)