|
Table of Contents
|
| This report is available in Acrobat Reader (.pdf
format) To download this report, you must have Acrobat Reader
loaded on your computer. If you do not have Acrobat Reader,
select the "Get Acrobat Reader" button below to download the
free software.
|
|
|
|
| Title Page |
| Abstract |
| Introduction |
| Materials
and Methods |
| Results |
| Discussion |
| Acknowledgements |
| References |
| Table
1 |
County-Level
Census Variables from the 1990 Bureau of Census and
Their Hexagon-Weighted Equivalents for the Conterminous United States |
| Table
2 |
Component Loadings for Significant PCA Vectors of
Hexagon-Weighted Census Data for the Conterminous United States
|
| Table
3 |
Summary
Statistics for Census Variables Across Regression Tree-Defined End Nodes for Beta-Settlement Index |
| Table 4 |
County-level demographics and barren landcover
change statistics for Atlantic and Gulf coastal barriers containing
large contiguous blocks
(³ 2 km2) of barren, dune ecosystems and associated with high
population growth and new building during the 1980’s, USA |
| Table
5 |
Threatened and endangered terrestrial and semi-aquatic vertebrates and
terrestrial plants occurring in coastal counties associated with high a-settlement and large blocks
(³ 2
km2) of contiguous barren dune ecosystems
|
|
|
| Figure
1 |
Spatial distribution of principal component
axis scores for the first significant axis - an index of human
settlement (a-settlement) - based on nine variables extracted from the
1990 United States Census |
| Figure 2 |
(a) Spatial distribution across the conterminous United States of the four
dominant census variables in the second principal component of Table 2
-- an index of density-independent growth and new building away from
traditional agricultural areas (b-settlement).
(b) The hexagon-level PCA
scores for b-settlement
are mapped. Note: b-settlement
scores increase with increasing population growth and newer structures
and decrease with increasing farm density and land proportion in
agriculture. |
| Figure
3 |
Regression tree
model for density-independent growth and new building (b-settlement)
and its environmental correlates across the conterminous United States |
| Figure 4 |
Atlantic and Gulf coastal barriers with large blocks
(³ 2
km2) of contiguous barren land that were associated with
nationally high levels of b-settlement
during the 1980s |
| Figure 5 |
Relationship
between percent change in barren land and change in population per km2
for coastal barriers |
| Figure 6 |
County-level
distribution of endangered terrestrial vertebrates and plants for the
conterminous United States. |
