Potential of Multivariate Quantitative Methods for Delineation and Visualization of Ecoregions

Hargrove, William W.; Hoffman, Forrest M.

doi:10.1007/s00267-003-1084-0

Cited by 251 publications

(203 citation statements)

References 64 publications

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“…The result is the ordination of the abiotic signatures according to the relative prevalence of each genospecies, weighted by the number of times each genospecies was reported in the target area. All of the procedures adhered to details published previously (11,19) and are available in File S3 in the supplemental material.…”

Section: Methodsmentioning

confidence: 99%

Correlation of Borrelia burgdorferi Sensu Lato Prevalence in Questing Ixodes ricinus Ticks with Specific Abiotic Traits in the Western Palearctic

Estrada-Peña

Ortega

Sánchez

et al. 2011

Appl Environ Microbiol

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This meta-analysis of reports examining ticks throughout the Western Palearctic region indicates a distinct geographic pattern for Borrelia burgdorferi sensu lato prevalence in questing nymphal Ixodes ricinus ticks. The greatest prevalence was reported between the 5°E and 25°E longitudes based on an analysis of 123 collection points with 37,940 nymphal tick specimens (87.43% of total nymphs; 56.35% of total ticks in the set of reports over the target area). Climatic traits, such as temperature and vegetation stress, and their seasonality correlated with Borrelia prevalence in questing ticks. The greatest prevalence was associated with mild winter, high summer, and low seasonal amplitude of temperatures within the range of the tick vector, higher vegetation indices in the May-June period, and well-connected vegetation patches below a threshold at which rates suddenly drop. Classification of the target territory using a qualitative risk index derived from the abiotic variables produced an indicator of the probability of finding infected ticks in the Western Palearctic region. No specific temporal trends were detected in the reported prevalence. The ranges of the different B. burgdorferi sensu lato genospecies showed a pattern of high biodiversity between 4°W and 20°E, partially overlapping the area of highest prevalence in ticks. Borrelia afzelii and Borrelia garinii are the dominant species in central Europe (east of ϳ25°E), but B. garinii may appear alone at southern latitudes and Borrelia lusitaniae is the main indicator species for meridional territories.

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Section: Methodsmentioning

confidence: 99%

Correlation of Borrelia burgdorferi Sensu Lato Prevalence in Questing Ixodes ricinus Ticks with Specific Abiotic Traits in the Western Palearctic

Estrada-Peña

Ortega

Sánchez

et al. 2011

Appl Environ Microbiol

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“…Multivariate Spatio-Temporal Clustering (MSTC) (Hoffman & Hargrove, 1999;Hargrove & Hoffman, 2004;Hoffman et al, 2008;Kumar et al, 2011) and network representativeness analysis (Hargrove et al, 2003;Hoffman et al, 2013) Fifty ecoregions were delineated using MSTC (Kumar et al, 2011). The regions produced by this unsupervised classification method were then labeled with ecoregion or land cover type names derived from a suite of expert maps compared with the spatial clusters using the Mapcurves algorithm developed by Hargrove et al (2006).…”

Section: Multivariate Spatial Clustering Analysismentioning

confidence: 99%

CTFS‐ForestGEO: a worldwide network monitoring forests in an era of global change

Anderson‐Teixeira

Davies

Bennett

et al. 2014

Global Change Biology

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Global change is impacting forests worldwide, threatening biodiversity and ecosystem services including climate regulation. Understanding how forests respond is critical to forest conservation and climate protection. This review describes an international network of 59 long-term forest dynamics research sites (CTFS-ForestGEO) useful for characterizing forest responses to global change. Within very large plots (median size 25 ha), all stems ≥1 cm diameter are identified to species, mapped, and regularly recensused according to standardized protocols. CTFS-ForestGEO spans 25°S-61°N latitude, is generally representative of the range of bioclimatic, edaphic, and topographic conditions experienced by forests worldwide, and is the only forest monitoring network that applies a standardized protocol to each of the world's major forest biomes. Supplementary standardized measurements at subsets of the sites provide additional information on plants, animals, and ecosystem and environmental variables. CTFS-ForestGEO sites are experiencing multifaceted anthropogenic global change pressures including warming (average 0.61°C), changes in precipitation (up to AE30% change), atmospheric deposition of nitrogen and sulfur compounds (up to 3.8 g N m À2 yr À1 and 3.1 g S m À2 yr À1), and forest fragmentation in the surrounding landscape (up to 88% reduced tree cover within 5 km). The broad suite of measurements made at CTFS-ForestGEO sites makes it possible to investigate the complex ways in which global change is impacting forest dynamics. Ongoing research across the CTFSForestGEO network is yielding insights into how and why the forests are changing, and continued monitoring will provide vital contributions to understanding worldwide forest diversity and dynamics in an era of global change.

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“…This map follows the suggestion of Hargrove and Hoffman (2004) that the clustering of the three color mixing maps into map classes can improve the multivariate interpretation.…”

Section: Histogram Ranking and Visualization Techniquesmentioning

confidence: 99%

“…The second map is an RGB (red, green, blue) composition of the three univariate layers, relying on the theory of color mixing. Although the RGB approach is generally used in remote sensing visualizations, its use in other quantitative contexts still has few documented applications (Hargrove and Hoffman 2004;Craig et al 2006).…”

Section: Histogram Ranking and Visualization Techniquesmentioning

confidence: 99%

Analysis of spatial–temporal patterns of water table change as a tool for conjunctive water management in the Upper Central Plain of the Chao Phraya River Basin, Thailand

et al. 2014

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A sustainable strategy for conjunctive water management must include information on the temporal and spatial availability of this natural resource. Because of water shortages in the dry seasons, farmers on the Upper Plain of the Chao Phraya River basin, Thailand, are increasingly using groundwater to meet their irrigation needs. To evaluate the possibilities of conjunctive water management in the area, the spatial-temporal changes in the water table of the Younger Terrace Aquifer were investigated. First, a regional geomorphological map based on field surveys, remote sensing and previous environmental studies was developed. Then, the well data were analyzed in relation to rainfall, streamflow, yield and pumpage, and the data were interpolated using geostatistical techniques. The results were analyzed via integrated zoning based on color theory as applied to multivariate visualization. The analysis results indicate areas that would be more suitable for groundwater extraction in a conjunctive management framework with regard to the natural hydrogeological processes and the effects of human interaction. The kriging results were compared with the geomorphological map, and the geomorphological areas exhibit distinct hydrogeological patterns. The western fans exhibit the best potential for the expansion of conjunctive use, whereas the borders of the northern fans exhibit the lowest potential.

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Potential of Multivariate Quantitative Methods for Delineation and Visualization of Ecoregions

Cited by 251 publications

References 64 publications

Correlation of Borrelia burgdorferi Sensu Lato Prevalence in Questing Ixodes ricinus Ticks with Specific Abiotic Traits in the Western Palearctic

Correlation of Borrelia burgdorferi Sensu Lato Prevalence in Questing Ixodes ricinus Ticks with Specific Abiotic Traits in the Western Palearctic

CTFS‐ForestGEO: a worldwide network monitoring forests in an era of global change

Analysis of spatial–temporal patterns of water table change as a tool for conjunctive water management in the Upper Central Plain of the Chao Phraya River Basin, Thailand

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