Browsing UMBC Geography and Environmental Systems Department by Issue Date
Now showing items 1-20 of 130
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Soil Moisture Gradients and Controls on a Southern Appalachian Hillslope from Drought Through Recharge
(European Geosciences Union, 1998)Soil moisture gradients along hillslopes in humid watersheds, although indicated by vegetation gradients and by studies using models, have been difficult to confirm empirically. While soil properties and topographic features ... -
Multiple Source Pools and Dispersal Barriers for Galápagos Plant Species Distribution
(Wiley, 2000)We reexamined geographic factors explaining the number of plant species on islands in the Galápagos Archipelago. We hypothesized that plant species richness (S) was related to the number of source pools and that plant ... -
Applications of Geographic Analysis in Parole and Probation
(2001-08)The advent of community-based supervision in parole and probation agencies has led to a new need for detailed location information. Three staff members received intensive training in the application of GIS tools to data ... -
Hillslope Nutrient Dynamics Following Upland Riparian Vegetation Disturbance
(Springer, 2003)We investigated the effects of removing near-stream Rhododendron and of the natural blowdown of canopy trees on nutrient export to streams in the southern Appalachians. Transects were instrumented on adjacent hillslopes ... -
Influence of land use on the integrity of marsh bird communities of Chesapeake Bay, USA
(Springer Netherlands, 2004-12)The landscape within the Chesapeake Bay watershed has been and continues to be impacted by human modifications. Understanding if such anthropogenic disturbances influence organisms that are dependent upon estuarine wetlands ... -
Nonbreeding Habitat Occupancy And Population Processes: An Upgrade Experiment With A Migratory Bird
(Ecological Society of America, 2005-09-01)Evidence is accumulating that winter habitats occupied by migratory birds produce differences in individual condition that can carry over into subsequent stages of the annual cycle. Despite strong observational evidence, ... -
Property Crimes and Violence in United States: An Analysis of the influence of Population density
(2006-07)The role of population density in the generation or suppression of crime has been the subject of debate for decades. The classic argument is that high density offers opportunities for property crimes, given that it is a ... -
Relative Effects of Land Use and Near-Stream Chemistry on Phosphorus in an Urban Stream
(ACSESS Digital Library, 2007)Elevated levels of P in urban streams can pose significant water quality problems. Sources of P in urban streams, however, are difficult to identify. It is important to recognize both natural and anthropogenic sources of ... -
FIRST-YEAR RESPONSES TO MANAGED FLOODING OF LOWER COLUMBIA RIVER BOTTOMLAND VEGETATION DOMINATED BY PHALARIS ARUNDINACEA
(Springer, 2008)Managers at Smith and Bybee Wetlands Natural Area (SBW), an 800-ha preserve in Portland, Oregon, recently installed a water control structure to suppress invasive reed canarygrass (Phalaris arundinacea L.) with spring and ... -
Molt-Migration in the American Redstart (Setophaga Ruticilla) Revisited: Explaining Variation in Feather δD Signatures
(American Ornithological Society, 2008-07-01) -
Coastal urbanization and the integrity of estuarine waterbird communities: Threshold responses and the importance of scale
(Elsevier B.V., 2008-10-10)Estuarine ecosystems are becoming increasingly altered by the concentration of human populations near the coastline, however a robust indicator of this change is lacking. We developed an index of waterbird community integrity ... -
Plumage brightness predicts non‐breeding season territory quality in a long‐distance migratory songbird, the American redstart Setophaga ruticilla
(John Wiley & Sons, Inc, 2009-01-13)Many species of birds exhibit brilliant ornamental plumage, yet most research on the function and evolution of plumage has been confined to the breeding season. In the American redstart Setophaga ruticilla, a long‐distance ... -
Water Relations Advantages for Invasive Rubus Armeniacus Over Two Native Ruderal Congeners
(springer, 2010)Despite species in the Rubus fruticosus complex (wild blackberry) being among the most invasive plants globally in regions with large annual fluctuations in water availability, little is known about their water relations. ... -
Urban and rural-residential land uses : their role in watershed health and the rehabilitation of Oregon's wild salmonids
(2010-12-31)Urban areas currently cover a small fraction of Oregon’s landscape but will expand to accommodate an increasingly large proportion of the state’s growing population and economic activity. Residential developments on rural ... -
Valuing ecological systems and services
(F1000, 2011)Making trade-offs between ecological services and other contributors to human well-being is a difficult but critical process that requires valuation. This allows both better recognition of the ecological, social, and ... -
Growing Cities Depend on Ecosystem Services
(Solutions for a Sustainable and Desirable Future, 2011)Many studies have documented the growing fragility of a majority of the globe’s ecosystems. Policymakers and resource managers often frame such ecosystem challenges as primarily about protecting natural systems in rural ... -
Biophysical and Socioeconomic Factors Associated with Forest Transitions at Multiple Spatial and Temporal Scales
(Resilience Alliance, 2011)Forest transitions (FT) occur when socioeconomic development leads to a shift from net deforestation to reforestation; these dynamics have been observed in multiple countries across the globe, including the island of Puerto ... -
COMSOL Modeling of Groundwater Flow and Contaminant Transport in Two-Dimensional Geometries With Heterogeneities
(2011)The Delmarva Peninsula is located on the East Coast of the United States, between the Chesapeake Bay and Atlantic Ocean. Industrial farming in the Delmarva Peninsula leads to levels of nutrients, in particular nitrogen, ... -
Rainfall-induced changes in food availability modify the spring departure programme of a migratory bird
(The Royal Society, 2011-03-30)Climatic warming has intensified selection for earlier reproduction in many organisms, but potential constraints imposed by climate change outside the breeding period have received little attention. Migratory birds provide ... -
Challenging claims in the study of migratory birds and climate change
(Cambridge Philosophical Society, 2011-04-13)Recent shifts in phenology in response to climate change are well established but often poorly understood. Many animals integrate climate change across a spatially and temporally dispersed annual life cycle, and effects ...