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Herbivores have the capacity to modify plant community composition and ecosystem structure and function via browsing. For example, moose and snowshoe hare facilitate succession in Alaska’s boreal forest by preferentially browsing early successional species over late successional conifers. Snowshoe hares also eat conifers, including white spruce, and this browsing may affect the pattern of spruce establishment over time. We measured over 800 spruce at 18 locations along the Tanana River floodplain in interior Alaska, USA and demonstrated that the proportion of spruce browsed annually positively correlates with annual hare abundance. Nearly all seedlings sampled had been browsed. Further, we modeled the pattern of...
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Herbivores transform landscapes and affect succession via selective foraging that alters vegetation composition. In the boreal forest, mammalian herbivores, mainly moose, facilitate a shift toward the dominance of heavily defended species over time, such as white spruce. The effects of moose herbivory are intensified by the browsing of snowshoe hares. However, unlike moose, snowshoe hares also browse seedlings of white spruce. We quantified herbivory by snowshoe hares on white spruce along the Tanana River, interior Alaska, and assessed the effects on white spruce demography via two different herbivore exclosure experiments. We hypothesized that both experiments would show reduced plant density and height growth...
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Rivers may act as barriers to the movement of terrestrial mammals, which could limit dispersal and gene flow. Glacial rivers are particularly hazardous because of the cold water temperature and swift current. Yet, we determined that 2 Canada Lynx (Lynx canadensis) equipped with GPS collars repeatedly swam across the main channel of the Tanana River in interior Alaska in 2011 as late in the season as November, when the average minimum daily air temperature was -27°C. These observations are consistent with the low level of genetic structure observed in Canada Lynx in northwestern North America and suggest that even large rivers may pose less of a barrier to movement by Canada Lynx than expected. [ABSTRACT FROM AUTHOR
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Herbivores transform landscapes and affect succession via selective foraging that alters vegetation composition. In the boreal forest, mammalian herbivores, mainly moose, facilitate a shift toward the dominance of heavily defended species over time, such as white spruce. The effects of moose herbivory are intensified by the browsing of snowshoe hares. However, unlike moose, snowshoe hares also browse seedlings of white spruce. We quantified herbivory by snowshoe hares on white spruce along the Tanana River, interior Alaska, and assessed the effects on white spruce demography via two different herbivore exclosure experiments. We hypothesized that both experiments would show reduced plant density and height growth...
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Subsistence harvesting and wild food production by Athabascan peoples is part of an integrated social-ecological system of interior Alaska. We describe effects of recent trends and future climate change projections on the boreal ecosystem of interior Alaska and relate changes in ecosystem services to Athabascan subsistence. We focus primarily on moose, a keystone terrestrial subsistence resource of villages in that region. Although recent climate change has affected the boreal forest, moose, and Athabascan moose harvesting, a high dependence by village households on moose persists. An historical account of 20th century socioeconomic changes demonstrates that the vulnerability of Athabascan subsistence systems to...
map background search result map search result map Persistent effects of fire severity on early successional forests in interior Alaska Multiple crossings of a large glacial river by Canada Lynx (Lynx canadensis) Browse removal, plant condition, and twinning rates before and after short-term changes in moose density Plant Toxicity, Adaptive Herbivory, and Plant Community Dynamics Acceleration of vegetation turnover and element cycling by mammalian herbivory in riparian ecosystems Development of Alnus tenuifolia stands on an Alaskan floodplain: patterns of recruitment, disease and succession Modeling Groundwater Upwelling as a Control on River Ice Thickness Browse biomass removal and nutritional condition of moose Alces alces Synchrony in the snowshoe hare (Lepus americanus) cycle in northwestern North America, 1970-2012 Resilience of Athabascan subsistence systems to interior Alaska's changing climate Buried organic horizons represent amino acid reservoirs in boreal forest soils Soil amino acid composition across a boreal forest successional sequence Amino acid uptake in deciduous and coniferous taiga ecosystems Nitrogen cycling at treeline: Latitudinal and elevational patterns across a boreal landscap Asynchronous recruitment dynamics of snowshoe hares and white spruce in a boreal forest Stage-dependent effects of browsing by snowshoe hares on successional dynamics in a boreal forest ecosystem Stage-dependent effects of browsing by snowshoe hares on successional dynamics in a boreal forest ecosystem Multiple crossings of a large glacial river by Canada Lynx (Lynx canadensis) Plant Toxicity, Adaptive Herbivory, and Plant Community Dynamics Soil amino acid composition across a boreal forest successional sequence Amino acid uptake in deciduous and coniferous taiga ecosystems Stage-dependent effects of browsing by snowshoe hares on successional dynamics in a boreal forest ecosystem Development of Alnus tenuifolia stands on an Alaskan floodplain: patterns of recruitment, disease and succession Buried organic horizons represent amino acid reservoirs in boreal forest soils Acceleration of vegetation turnover and element cycling by mammalian herbivory in riparian ecosystems Modeling Groundwater Upwelling as a Control on River Ice Thickness Persistent effects of fire severity on early successional forests in interior Alaska Asynchronous recruitment dynamics of snowshoe hares and white spruce in a boreal forest Stage-dependent effects of browsing by snowshoe hares on successional dynamics in a boreal forest ecosystem Browse removal, plant condition, and twinning rates before and after short-term changes in moose density Nitrogen cycling at treeline: Latitudinal and elevational patterns across a boreal landscap Browse biomass removal and nutritional condition of moose Alces alces Resilience of Athabascan subsistence systems to interior Alaska's changing climate Synchrony in the snowshoe hare (Lepus americanus) cycle in northwestern North America, 1970-2012