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Articles 1 - 12 of 12
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Formation And Age Of Raised Marine Beaches, Northern Scott Coast, Antarctica, Nathan Gardner
Formation And Age Of Raised Marine Beaches, Northern Scott Coast, Antarctica, Nathan Gardner
Electronic Theses and Dissertations
The stability of the West Antarctic Ice Sheet (WAIS) is a key problem because of its potential effect on global sea level and climate. Some geologic evidence suggests that the ice sheet has collapsed in the past, which, if correct, implies that future disintegration is possible. Isolation of the mechanism(s) that have affected WAIS behavior since the last glacial maximum (LGM) may yield information about factors that control it today. Previous studies have indicated thatrecession of the WAIS from the LGM position occurred in the middle to late Holocene. However, the data come fiom points too far south to assess …
The Effect Of Nitrogen Loading On An Estuarine Faunal Community: A Stable Isotope Approach, Rachel A. Keats
The Effect Of Nitrogen Loading On An Estuarine Faunal Community: A Stable Isotope Approach, Rachel A. Keats
Electronic Theses and Dissertations
Coastal ecosystems worldwide face increased nutrient enrichment from shoreline and watershed development and atmospheric pollution. To gain an understanding of the effects of nitrogen loading on the natural faunal community of Ruppia maritima beds in Northeast Creek estuary (Acadia National Park, Maine, USA), we (1) assessed the response of the faunal community to increased nitrogen loading using an in situ enrichment experiment during the summer growing season of 2001 (Chapter I), and (2) completed a description of the natural macroinvertebrate community in the estuary in 2001 with qualitative (May-July) and quantitative (August-October) monthly sample collections (Chapter 2). This study formed …
Relationships Between Stream Geomorphology And Fish Community Structure And Diversity In Maine, Emily Gaenzle
Relationships Between Stream Geomorphology And Fish Community Structure And Diversity In Maine, Emily Gaenzle
Electronic Theses and Dissertations
Predicting patterns in species distribution and abundance for resource management and conservation is a major focus of applied ecology. The primary objective of this study was to determine if there is a predictable relationship between stream geomorphology and fish community structure, native species richness, and native salmonid abundance in Maine. Specifically, I examined relationships between fish assemblages and geomorphic stream types, as delineated by the Rosgen classification system (Rosgen 1996). Fifty-three stream reaches in Maine were classified, and fish communities within the reaches were characterized using backpack electrofishing. Species richness was lowest in A-type streams (i.e., steep, entrenched, confined), which …
Late Holocene Sea-Level Change Around Newfoundland, Julia Daly
Late Holocene Sea-Level Change Around Newfoundland, Julia Daly
Electronic Theses and Dissertations
Analysis of basal salt-marsh peats and tide-gauge data from several locations around Newfoundland yield high-resolution late Holocene sea-level reconstructions and constrain differential sea-level change. The transition between rising and falling local sea levels and the influence of glacioisostasy on relative sea-level change around Newfoundland through the late Holocene are not well known fiom previous research. The patterns of local relative sea-level change during this time have important implications for constraining numerical models of sea-level change, and therefore inferences about ice sheet thickness and the response of the lithosphere to deglaciation. I investigated the stratigraphy of salt marshes at four locations …
Evolution Of Seabed Pockmarks In Penobscot Bay, Maine, Allen M. Gontz
Evolution Of Seabed Pockmarks In Penobscot Bay, Maine, Allen M. Gontz
Electronic Theses and Dissertations
Seafloor depressions, called pockmarks, have been known to exist in Penobscot Bay, Maine since the mid 1980's (Knebel and Scanlon, 1985). Earlier workers (Ostericher, 1965) recognized "channels" on sonoprobe records that are in the sanle area as the pockmarks recognized by Knebel and Scanlon (1985). Their origins and pathways of evolution are unknown. Much speculation about the sources of pore fluids, levels of activity, and evolutionary pathways has occurred since their discovery. Two surveys of Belfast Bay, in 1998 and 1989, have shown differences in the pockmark field population. Over the course of a decade, 36% of the field's 1998 …
The Role Of Forest Soils In A Northern New England Effluent Management System, Leslie B. Nelson
The Role Of Forest Soils In A Northern New England Effluent Management System, Leslie B. Nelson
Electronic Theses and Dissertations
The Carrabassett Valley Sanitary District in Carrabassett Valley, Maine has utilized both a forest spray irrigation system and a Snowfluent™ system for the treatment of their wastewater effluent. This study was designed to evaluate potential changes in soil properties after approximately 20 years of treatment in the forested spray irrigation site and three years of treatment in the field Snowfluent™ site. In addition, grass yield and composition were evaluated on the field study sites. After treatment with effluent or Snowfluent™, soils showed an increase in soil exchangeable Ca, Mg, Na, and K, base saturation, and pH. While most constituents were …
Distribution Of Patterned Ground And Surficial Deposits On A Debris-Covered Glacier Surface In Mullins Valley And Upper Beacon Valley, Antarctica, Andrew M. Lorrey
Distribution Of Patterned Ground And Surficial Deposits On A Debris-Covered Glacier Surface In Mullins Valley And Upper Beacon Valley, Antarctica, Andrew M. Lorrey
Electronic Theses and Dissertations
Beacon Valley is located in the western Dry Valleys, Antarctica, adjacent to the East Antarctic Ice Sheet (EAIS). The surficial material on the floor of Beacon Valley is segmented into large polygonal landforms separated by trenches. Buried beneath the polygons and surficial material is massive ground ice. One hypothesis is that the buried ice in upper Beacon Valley is glacier ice originating from local debris-covered glaciers. The networks of polygons and trenches form as the buried ice undergoes thermal contraction and sublimation. Contraction cracks that penetrate the surficial material and buried ice in Beacon Valley contain Late Miocene age volcanic …
Variability And Continuity Between Paleoindian Assemblages In The Northeast: A Technological Approach, Edward Cyrus Moore
Variability And Continuity Between Paleoindian Assemblages In The Northeast: A Technological Approach, Edward Cyrus Moore
Electronic Theses and Dissertations
The Paleoindian record in Maine consists almost exclusively of stone artifacts. Of these artifacts, the fluted projectile point is the most widely recognized and researched, particularly its morphology. Very little is known of the technological strategies involved in the production of Paleoindian stone tools or whether these strategies were consistent between Paleoindian sites. This research examines stone tool production methods and technological organization between two Paleoindian sites in Maine (Janet Cormier and Nicholas) using remnant technological attributes observed on discarded artifacts. Both sites are located in southwestern Maine within the Little Androscoggin River. The sites are situated on elevated, well-drained …
Growth Increment Analysis Of Marine Bivalves From The North, Stephen D. Houk
Growth Increment Analysis Of Marine Bivalves From The North, Stephen D. Houk
Electronic Theses and Dissertations
This study aids in developing a sea surface temperature (SST) proxy with monthly temporal resolution using a combination of growth increment and stable isotope analyses of marine bivalves from the north coast of Peru. Faunal assemblages from the Siches and Ostra Base Camp archaeological sites contain shells of warm-tropical mollusks that currently live farther north in Ecuador. The presence of warm-tropical species in these sites and others as far south as 10"s latitude and dating prior to 5730 cal yr B.P. indicates a stable warm-water regime in the eastern tropical Pacific which subsequently changes to a modern temperate-water regime after …
Surficial Geology And Geomorphology Of The Western Olympus Range, Antarctica: Implications For Ice-Sheet History, Brett Vandenheuvel
Surficial Geology And Geomorphology Of The Western Olympus Range, Antarctica: Implications For Ice-Sheet History, Brett Vandenheuvel
Electronic Theses and Dissertations
A widespread erosion surface passes across bedrock and sedimentary deposits in the western Dry Valleys sector of the Transantarctic Mountains (TAM), southern Victoria Land, Antarctica. The surface includes stoss-and-lee slopes, channels, potholes, scoured basins, and corrugated bedrock. These features have been taken to represent subglacial meltwater erosion beneath a greatly expanded East Antarctic Ice Sheet (EAIS) in the mid-Miocene (Denton et al. 1984, Marchant et al. 1993a). Sedimentary deposits that are typically associated with ice-sheet wastage, such as outwash, are not present on the erosion surface. The lack of these deposits indicates that the expanded ice-sheet postulated to be responsible …
Early Stage Humification During Amendment Decomposition And Its Influence On Cu-Binding Capacity Of Dissolved Organic Carbon, Karen A. Merritt
Early Stage Humification During Amendment Decomposition And Its Influence On Cu-Binding Capacity Of Dissolved Organic Carbon, Karen A. Merritt
Electronic Theses and Dissertations
This thesis monitored the progression of early-stage humification during the decomposition of four soil amendments and analyzed the effect of hurnification on the copper (Cu) binding capacity of amendment-derived dissolved organic carbon (DOC). Amendments chosen for the 8-week incubation were: wheat straw (Triticum aestivium L.), crimson clover (Trifolium incamaturn L.), a primary papermill residue (PPR), and a primary papermill residue mixed with secondary wastewater treatment sludge (PPR+SS). Specific attention was given to the
Decadal Responses In Soil N Dynamics At A Paired Watershed Experiment In Maine, Sultana Sarvatara Shah
Decadal Responses In Soil N Dynamics At A Paired Watershed Experiment In Maine, Sultana Sarvatara Shah
Electronic Theses and Dissertations
Nitrogen is commonly thought of as the most limiting nutrient to plant growth, yet elevated N deposition can result in N accumulating in excess of biotic demand, a condition known as 'TI Saturation." Excess N can perturb soil microbial N transformations and may cause initial increases in net N mineralization rates followed by decreases in net N mineralization with concomitant increases in net nitrification. Along with increases in net nitrification and N loss, N saturation is often associated with a loss of forest productivity. Understanding nitrogen dynamics in soil under enhanced N deposition is key to predicting future forest health. …