[show abstract][hide abstract] ABSTRACT: Heavy metal escapement associated with ore trucks is known to occur along the DeLong Mountain Regional Transportation System (DMTS) haul road corridor in Cape Krusenstern National Monument, northwest Alaska. Heavy metal concentrations in Hylocomium splendens moss (n = 226) were used in geostatistical models to predict the extent and pattern of atmospheric deposition of Cd and Pb on Monument lands. A stratified grid-based sample design was used with more intensive sampling near mine-related activity areas. Spatial predictions were used to produce maps of concentration patterns, and to estimate the total area in 10 moss concentration categories. Heavy metal levels in moss were highest immediately adjacent to the DMTS haul road (Cd > 24 mg/kg dw; Pb > 900 mg/kg dw). Spatial regression analyses indicated that heavy metal deposition decreased with the log of distance from the DMTS haul road and the DMTS port site. Analysis of subsurface soil suggested that observed patterns of heavy metal deposition reflected in moss were not attributable to subsurface lithology at the sample points. Further, moss Pb concentrations throughout the northern half of the study area were high relative to concentrations previously reported from other Arctic Alaska sites. Collectively, these findings indicate the presence of mine-related heavy metal deposition throughout the northern portion of Cape Krusenstern National Monument. Geospatial analyses suggest that the Pb depositional area extends 25 km north of the haul road to the Kisimilot/Iyikrok hills, and possibly beyond. More study is needed to determine whether higher moss heavy metal concentrations in the northernmost portion of the study area reflect deposition from mining-related activities, weathering from mineralized Pb/Zn outcrops in the broader region, or a combination of the two. South of the DMTS haul road, airborne deposition appears to be constrained by the Tahinichok Mountains. Heavy metal levels continue to diminish south of the mountains, reaching a minimum in the southernmost portion of the study area near the Igichuk Hills (45 km from the haul road). The influence of the mine site was not studied.
Science of The Total Environment 10/2005; 348(1-3):211-30. · 3.26 Impact Factor
[show abstract][hide abstract] ABSTRACT: Alaska. The diversity of areas and of their resources is reflected in their designation as national parks, monuments, preserves, and historical parks. These 16 areas represent more than 50 percent of the total acreage the National Park Service administers. The Alaska Region's Resource Management Program directs scientific research and resource management programs in a wide range of biological, physical, and social science disciplines. The National Park Service disseminates reports on high priority, current resource management information, with managerial application, through the Alaska Region's Natural Resource Report Series. Technologies and resource management methods, resource management papers, proceedings of conferences and resource management workshops, and natural resource management plans are also disseminated through this series. Documents in this series usually contain information prepared primarily for internal use by the National Park Service. Mention of trade names or commercial products does not constitute endorsement or recommendation for use by the National Park Service.
[show abstract][hide abstract] ABSTRACT: Found that 7 hand-reared wolves performed better than 4 Alaskan malamutes and maternally-reared wolves on Wisconsin General Test Apparatus (WGTA) measures of oddity learning. Differences between the 2 groups of wolves are interpreted as motivational. Differences between the hand-reared wolves and the malamutes contradict predictions that dogs should perform better than wolves on training tasks and suggest that the WGTA tasks are amenable to either trial-and-error (associative) solutions typical of training-task performance or complex cognitive (insight) solutions more typically observed in problem-solving performance. Results confirm that insightful solutions produce more rapid acquisition and that wolf performance exhibits more insight. (PsycINFO Database Record (c) 2012 APA, all rights reserved)