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Articles 1 - 30 of 76
Full-Text Articles in Social and Behavioral Sciences
Spatial Hyperdynamism In A Post-Disturbance Simulated Forest, Qian Wang, George Malanson
Spatial Hyperdynamism In A Post-Disturbance Simulated Forest, Qian Wang, George Malanson
George P Malanson
Spatial hyperdynamism in a post-disturbance simulated forest is studied. When the cutting rate is high and if the cutting pattern is scattered or involving a larger area, the two landscape metrics have much greater variance after cutting. After cutting the potential interaction between different species is more dynamic than that before the cutting, which can be detected from the variation of the proximity measure. These dynamics are primarily driven by the appearance and disappearance of single cell patches as colonizers temporarily occupy cells vacated by the deaths of better competitors. Boundary cells are most likely to be dynamic because their …
Comment On Modeling Ecological Response To Climatic Change, George Malanson
Comment On Modeling Ecological Response To Climatic Change, George Malanson
George P Malanson
No abstract provided.
Canadian Landform Examples; 27, Beaver Landforms, David Butler, George Malanson
Canadian Landform Examples; 27, Beaver Landforms, David Butler, George Malanson
George P Malanson
No abstract provided.
Ecological Processes And Spatial Patterns Before, During And After Simulated Deforestation, George Malanson, Qian Wang, John Kupfer
Ecological Processes And Spatial Patterns Before, During And After Simulated Deforestation, George Malanson, Qian Wang, John Kupfer
George P Malanson
Ecological processes and spatial patterns, before, during and after simulated deforestation are examined. A competition-colonization simulation, in which the primary trade offs are represented in a spatially explicit model, is used to explore the consequences of additional aspects of landscape dynamics following deforestation for plant diversity and community structure. Deforestation changes the spatial pattern of the landscape, and species respond differently because of their different dispersal abilities. The basic lessons of competition-colonization models for deforestation stand, but the ensured extinction implied by the extinction debt concept is further ameliorated as more realistic pattern-process relations are theorized.
Geomorphological Limits To Self-Organization Of Alpine Forest-Tundra Ecotone Vegetation, Yu Zeng, George Malanson, David Butler
Geomorphological Limits To Self-Organization Of Alpine Forest-Tundra Ecotone Vegetation, Yu Zeng, George Malanson, David Butler
George P Malanson
Feedback in the establishment of vegetation has been shown to produce spatial patterns that differ from the geomorphological basis for resources. The dynamics of these spatial patterns have been characterized as self-organization because local processes produce them at landscape scales. Geomorphic patterns could, however, enhance or disrupt the processes that lead to patterns and the interpretation of self-organization. A simulation model that showed such indication of self-organization at alpine forest-tundra ecotones is modified to incorporate a geomorphic feature commonly seen in this environment - solifluction steps - as an exogenous condition in the model. Analyses linking spatial patterns and rates …
Nearest Neighbor Analysis Of Miniature Polygonal Patterned Ground, Eastern Glacier National Park, Montana, David Butler, George Malanson, Thomas Wilbanks
Nearest Neighbor Analysis Of Miniature Polygonal Patterned Ground, Eastern Glacier National Park, Montana, David Butler, George Malanson, Thomas Wilbanks
George P Malanson
No abstract provided.
Effects Of Dispersal, Population Delays, And Forest Fragmentation On Tree Migration Rates, George Malanson, David Cairns
Effects Of Dispersal, Population Delays, And Forest Fragmentation On Tree Migration Rates, George Malanson, David Cairns
George P Malanson
Examining the relation between the dispersal of seeds across landscapes and the migration of species can inform studies of processes such as invasions and response to climatic change. In this research a spatially explicit model is used to analyze the effects of dispersal probability, limits on establishment, generation time, seed crop probability, and varying proportions and patterns of landscape fragmentation on migration rate. Comparisons are made with rates inferred for migrations based on isopols of species range changes in the Holocene (20–200 km/century). The effects of the parameters on migration rate in the model are additive. Dispersal probability, related to …
Turf-Banked Terrace Treads And Risers, Turf Exfoliation And Possible Relationships With Advancing Treeline, David Butler, George Malanson, Lynn Resler
Turf-Banked Terrace Treads And Risers, Turf Exfoliation And Possible Relationships With Advancing Treeline, David Butler, George Malanson, Lynn Resler
George P Malanson
Fine-scale geomorphic/pedogenic processes at alpine treeline may facilitate the initial stages of conifer invasion of alpine tundra. Turf-banked terraces and turf exfoliation associated with solifluction may provide both the topographic protection and the seedbed necessary for conifer establishment above treeline. The morphometry, stoniness and surface penetrability of turf-banked terraces were recorded. Whereas differences among sites exist due to topographic constraints, differences in soil penetrability depend on turf exfoliation. Exfoliated turf risers are significantly more penetrable than non-exfoliated solifluction risers and adjacent treads. These penetrable microsites provide favorable conditions for seed germination. The process of turf exfoliation may play a role …
Fire History And Patterns Of Venturan Subassociations Of Californian Coastal Sage Scrub, George Malanson
Fire History And Patterns Of Venturan Subassociations Of Californian Coastal Sage Scrub, George Malanson
George P Malanson
Californian coastal sage scrub has floristically distinct subassociations with sharp boundaries in the Santa Monica Mountains. This mesoscale biogeographic pattern has been variously attributed to the timing and pattern of fire and to differences in the moisture availability on sites. An examination of the actual fire history of sites reveals that recent fire events are unlikely to have caused the observed patterns. Sites with similar fire histories are not as similar in vegetation as sites with different fire histories but similar aspect. Single short fire intervals do not result in dissimilar communities; fires are unlikely to recur with the same …
Effects Of Feedbacks And Seed Rain On Ecotone Patterns, George Malanson
Effects Of Feedbacks And Seed Rain On Ecotone Patterns, George Malanson
George P Malanson
Ecotones can be abrupt changes in vegetation on gradual abiotic gradients, such as some treelines, and so have been considered as potential indicators of response to climatic change and regulators of fluxes across landscapes. Factors of positive feedback for growth and establishment and seed rain from source areas have been suggested as playing a role in such patterns and dynamics. The effects of variation in feedback strength and seed rain on the abrupt pattern have not, however, been assessed. A spatially explicit computer simulation is used to represent an ecotone as might occur at a mountain treeline. The steepness of …
Geomorphic And Biogeographic Setting Of The Rocky Mountains; Rocky Mountain Futures; An Ecological Perspective, David Cairns, David Butler, George Malanson
Geomorphic And Biogeographic Setting Of The Rocky Mountains; Rocky Mountain Futures; An Ecological Perspective, David Cairns, David Butler, George Malanson
George P Malanson
No abstract provided.
Topographic Shelter And Conifer Establishment And Mortality In An Alpine Environment, Glacier National Park, Montana, Lynn Resler, David Butler, George Malanson
Topographic Shelter And Conifer Establishment And Mortality In An Alpine Environment, Glacier National Park, Montana, Lynn Resler, David Butler, George Malanson
George P Malanson
No abstract provided.
Linear Forest Patterns In Subalpine Environments, Matthew Bekker, George Malanson
Linear Forest Patterns In Subalpine Environments, Matthew Bekker, George Malanson
George P Malanson
Studies of feedback between ecological pattern and process can benefit from the analysis of visually striking patterns, as they may reveal underlying processes and clarify the relative role of exogenous versus endogenous factors in driving vegetation change. Roughly linear forest patches are common in subalpine environments, including `hedges', `ribbon forest', and `Shimagare' or `wave regenerated forests' (waves). The influence of wind is common among these patterns, but the role of positive feedback, the most important component of self-organization in biological systems, varies. Hedges are orientated parallel to prevailing winds in several mid-latitude mountain ranges worldwide. Desiccation and ice-particle abrasion kills …
Geomorphic Patterns And Processes At Alpine Tree Line, David Butler, George Malanson, Lynn Resler, Stephen Walsh
Geomorphic Patterns And Processes At Alpine Tree Line, David Butler, George Malanson, Lynn Resler, Stephen Walsh
George P Malanson
No abstract provided.
Spatial Representations Of Habitat In Competition-Colonization Models, George Malanson
Spatial Representations Of Habitat In Competition-Colonization Models, George Malanson
George P Malanson
No abstract provided.
Natural Areas Facing Climate Change, George Malanson
Natural Areas Facing Climate Change, George Malanson
George P Malanson
No abstract provided.
Extinction-Debt Trajectories And Spatial Patterns Of Habitat Destruction, George Malanson
Extinction-Debt Trajectories And Spatial Patterns Of Habitat Destruction, George Malanson
George P Malanson
No abstract provided.
Tree-Ring Analysis And Natural Hazard Chronologies; Minimum Sample Sizes And Index Values, David Butler, George Malanson, Jack Oelfke
Tree-Ring Analysis And Natural Hazard Chronologies; Minimum Sample Sizes And Index Values, David Butler, George Malanson, Jack Oelfke
George P Malanson
No abstract provided.
Dispersal Across Continuous And Binary Representations Of Landscapes, George Malanson
Dispersal Across Continuous And Binary Representations Of Landscapes, George Malanson
George P Malanson
No abstract provided.
Mapping, Modeling, And Visualization Of The Influences Of Geomorphic Processes On The Alpine Treeline Ecotone, Glacier National Park, Mt, Usa, Stephen Walsh, David Butler, George Malanson, Kelley Crews-Meyer
Mapping, Modeling, And Visualization Of The Influences Of Geomorphic Processes On The Alpine Treeline Ecotone, Glacier National Park, Mt, Usa, Stephen Walsh, David Butler, George Malanson, Kelley Crews-Meyer
George P Malanson
Spatially explicit digital technologies are integrated within a geographic information science (GISc) context to map, model, and visualize selected direct and indirect geomorphic processes that influence the spatial organization of the alpine treeline ecotone (ATE) in Glacier National Park (GNP), MT. GISc is used to examine alpine treeline and its biotic and abiotic controls through the application of multi-resolution remote sensing systems, geospatial information and product derivatives, and simulations of treeline spatial organization. Three geomorphic features are examined: relict solifluction terraces, evidence of nonlinearity in the development of a catena, and the locations of isolated boulders. The significance of these …
Beaver, Treefall, And Cutbank Erosion In Midwestern Rivers, David Butler, George Malanson, John Kupfer, Philip Pryde
Beaver, Treefall, And Cutbank Erosion In Midwestern Rivers, David Butler, George Malanson, John Kupfer, Philip Pryde
George P Malanson
No abstract provided.
Adding Ecosystem Function To Agent-Based Land Use Models, V. Yadav, S. Del Grosso, W. Parton, George Malanson
Adding Ecosystem Function To Agent-Based Land Use Models, V. Yadav, S. Del Grosso, W. Parton, George Malanson
George P Malanson
No abstract provided.
Alpine Treeline, Climate, And Environmental Changes, George Malanson, David Butler
Alpine Treeline, Climate, And Environmental Changes, George Malanson, David Butler
George P Malanson
No abstract provided.
Spatially Explicit Historical Land Use Land Cover And Soil Organic Carbon Transformations In Southern Illinois, Vineet Yadav, George Malanson
Spatially Explicit Historical Land Use Land Cover And Soil Organic Carbon Transformations In Southern Illinois, Vineet Yadav, George Malanson
George P Malanson
No abstract provided.
Effect Of Landscape Position On The Sediment Chemistry Of Abandoned-Channel Wetlands, W. Schwarz, George Malanson, F. Weirich
Effect Of Landscape Position On The Sediment Chemistry Of Abandoned-Channel Wetlands, W. Schwarz, George Malanson, F. Weirich
George P Malanson
The nature of sediments in abandoned channels is an important component of their development as floodplain wetlands. The texture, organic matter, phosphorous, potassium, and nitrogen content of sediments were determined for abandoned channels along the Iowa and Cedar Rivers near their confluence in Iowa. Differences in the levels of these constituents were examined among categories of three landscape gradients: present connectivity to the river, time since abandonment, and proximity to agricultural land use. Local scale processes of ecological development are seen in the importance of time for increased organic matter and nitrogen. Basin scale processes of sediment transport and deposition …
Woody Debris, Sediment, And Riparian Vegetation Of A Subalpine River, Montana, U.S.A, George Malanson, David Butler
Woody Debris, Sediment, And Riparian Vegetation Of A Subalpine River, Montana, U.S.A, George Malanson, David Butler
George P Malanson
No abstract provided.
Variability In An Edaphic Indicator In Alpine Tundra, George Malanson, D. Butler, D. Cairns, T. Welsh
Variability In An Edaphic Indicator In Alpine Tundra, George Malanson, D. Butler, D. Cairns, T. Welsh
George P Malanson
No abstract provided.
Landscape Frontiers, Geography Frontiers: Lessons To Be Learned, George Malanson, Yu Zeng, Stephen Walsh
Landscape Frontiers, Geography Frontiers: Lessons To Be Learned, George Malanson, Yu Zeng, Stephen Walsh
George P Malanson
No abstract provided.
Site Locations And Characteristics Of Miniature Patterned Ground, Eastern Glacier National Park, Montana, U.S.A, David Butler, George Malanson
Site Locations And Characteristics Of Miniature Patterned Ground, Eastern Glacier National Park, Montana, U.S.A, David Butler, George Malanson
George P Malanson
We examined a total of 68 sites with miniature polygonal patterned ground above treeline, along and east of the Continental Divide in Glacier National Park, Montana, USA. Patterned ground develops at three geographic site-types: convex uplands; concave mountain passes and cols; and valleyside slopes. Data were collected at each site to characterize the patterned ground morphometry. Morphometry was similar regardless of site-type, and occurrence was dependent on the presence of fine-grained material on older solifluction terraces or sorted nets.
Feedback-Driven Response To Multidecadal Climatic Variability At An Alpine Treeline, Kathryn Alftine, George Malanson, Daniel Fagre
Feedback-Driven Response To Multidecadal Climatic Variability At An Alpine Treeline, Kathryn Alftine, George Malanson, Daniel Fagre
George P Malanson
The Pacific Decadal Oscillation (PDO) has significant climatological and ecological effects in northwestern North America. Its possible effects and their modification by feedbacks are examined in the forest-tundra ecotone in Glacier National Park, Montana, USA. Tree ring samples were collected to estimate establishment dates in 10 quadrats. Age-diameter regressions were used to estimate the ages of uncored trees. The temporal pattern of establishment and survival was compared to the pattern of the PDO. A wave of establishment began in the mid-1940s, rose to a peak rate in the mid-1970s, and dropped precipitously beginning ca. 1980 to near zero for the …