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Residential expansion as a continental threat to U.S. coastal ecosystems
Authors:J. G. Bartlett  D. M. Mageean  R. J. O'Connor
Affiliation:(1) University of Maine, Maine, USA;(2) Southern Global Change Program, USDA Forest Service, 920 Main Campus Drive, Venture Center II, Suite 300, 27606 Raleigh, NC
Abstract:Spatially extensive analysis of satellite, climate, and census data reveals human-environment interactions of regional or continental concern in the United States. A grid-based principal components analysis of Bureau of Census variables revealed two independent demographic phenomena, α-settlement reflecting traditional human settlement patterns and β-settlement describing relative population growth correlated with recent construction in non-agricultural areas, notably in coastal, desert, and “recreational” counties and around expanding metropolitan areas. Regression tree analysis showed that β-settlement was differentially associated with five distinct combinations of seasonality, summer heat or cool, intensity of agriculture, and extent of “barren” land. Beta-settlement was greatest in coastal and desert areas, and coincided with national concentrations of threatened and endangered species.
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