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Alaska permafrost Arctic Network Bering Land Bridge National Preserve Biota Climatology Ecotypes Environment GeoscientificInformation ImageryBaseMapsEarthCover InlandWaters Land Cover Low Altitude Air Photo Low Altitude Video Northwest Alaska Northwest Arctic Oceans Photogrammetry Selawik National Wildlife Refuge Cape Krusenstern National Monument Gates of the Arctic National Park Gates of the Arctic National Preserve Kobuk Valley National Park Noatak National Preserve boreal forest Growth limitation hypothesis Picea glauca tundra-taiga ecotone FIELD SURVEY Picea Picea glauca