A5028465900- Geology and Paleoclimatology Research
- Botany, Ecology, and Taxonomy Studies
- Tree-ring climate responses
- Ecology and Vegetation Dynamics Studies
- Lichen and fungal ecology
- Pleistocene-Era Hominins and Archaeology
- Coastal wetland ecosystem dynamics
- Isotope Analysis in Ecology
- Fire effects on ecosystems
- Geological formations and processes
- Peatlands and Wetlands Ecology
- Archaeology and ancient environmental studies
- Botany and Plant Ecology Studies
- Climate Change and Environmental Impact
- Species Distribution and Climate Change
- Mercury impact and mitigation studies
- Rangeland and Wildlife Management
- Groundwater and Isotope Geochemistry
- Plant Water Relations and Carbon Dynamics
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Forest ecology and management
- Coastal and Marine Dynamics
- Marine and environmental studies
- Polar Research and Ecology
University of Maine
2008-2024
Eastern Maine Healthcare Systems
2008
Northern Arizona University
2008
Quaternary Research Association
2001
Abstract The judicious selection of sites for paleovegetational and paleoclimatic studies permits paleoecologists to answer specific research questions that go beyond primary descriptions past vegetation. We present a model describes the relationship between basin size pollen source area predicts proportions local, extralocal, regional sampled by lake basins different size. distinctive sampling properties lakes, peats, small hollows can be exploited provide details pattern in paleovegetation...
Abstract: The difficulties of saving millions species from extinction often cause conservationists to focus on a higher level biological organization, the community. They do so for two reasons: (1) communities are considered important entities in their own right; and (2) conserving representative samples is seen as an efficient way maintain high levels diversity. This approach will work if chosen contain almost all species. Because it potentially saves most but not species, community...
Oscillations of Pinus (pine) pollen in a 50,000-year sequence from Lake Tulane, Florida, indicate that there were major vegetation shifts during the last glacial cycle. Episodes abundant populations climate was more wet than intervening phases dominated by Quercus (oak) and Ambrosia -type (ragweed marsh-elder). The episodes seem to be temporally correlated with North Atlantic Heinrich events, which massive, periodic advances ice streams eastern margin Laurentide Ice Sheet. Possible links...
The landscapes of northern New England and adjacent areas Canada changed greatly between 14,000 9000 yr B.P.: deglaciation occurred, sea levels shorelines shifted, a vegetational transition from tundra to closed forest took place. Data 51 14 C-dated sites range elevations were used map ice positions, physiognomic zones, the spread individual tree taxa in region. A continuum tundra-woodland-forest passed northeastward northward without major hesitation or reversal. An increased rate...
Specimens of the vesicular–arbuscular mycorrhizal fungal Glomus fasciculatum complex have been identified from lake sediment cores Gould Pond (central Maine) and Upper South Branch (north central Maine). The fungus became established with tundra vegetation on newly developing soils soon after melting Wisconsin ice. This is first record such an occurrence for North America. earliest specimens were deposited in dated at about 13 000 years old those between 12 500 11 old. least 1000 prior to...
Abstract Data on soils with six Neoglacial moraines of the Klutlan Glacier have been compared those from at warm, moist coastal site Bay, 160 km south. Percentage organic matter increases rapidly for first 100 to 150 yr soil development and then continues rise gradually next yr. Soil pH falls 8.0 in recent till approximately 6.0 200-yr-old soils. Nitrogen levels mineral increase near zero tills 0.7% 175–200 old; horizons associated spruce forests later successional stages contain 1%...
We present a quantitative reconstruction of local forest history at two sites, Stavsåkra (hemiboreal zone) and Storasjö (southern boreal zone), in southern Sweden (province Småland) to evaluate possible causes contrasting Holocene fire histories mid- late Holocene. The Landscape Reconstruction Algorithm (LRA) is applied between-site differences the relative abundance deciduous trees Pinus (pine) landscape/woodland openness during LRA estimates vegetation are compared with other proxies...
Summary 1 Pollen data from wet, forested hollows in five spruce ( Picea ) stands on the eastern coast of Maine, USA, reveal that has been well‐established (spruce pollen > 6%) for at least 5000 years four sites (Isle au Haut, Schoodic Peninsula, and Roque Island). Spruce became dominant fifth stand (Blackwoods, Mount Desert Island) only last 2000 years. This is contrast to stratigraphies two inland forest lakes indicate a significant region‐wide increase abundance 1000 ago. 2 All coastal...
Little is known about the paleoecological histories of three spruce species (white spruce, Picea glauca; black P. mariana; and red rubens) in eastern North America, largely because difficulty separating pollen record. We describe a novel effective classification method distinguishing grains on basis quantitative analysis grain attributes. The illustrated by an large sample modern (522 from 38 collections) species, collected region where co-occur today. For each X we computed binary...