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In Northern Virginia, mosquito populations, NDVI, and temperature were higher in 2006 than in 2005 for all months except September (Figure 4.7). In the Richmond- Petersburg region, mosquito populations were lower in 2006 than in 2005 for all months except April and May. In the Hampton Roads region, mosquito populations were higher in 2006 than in 2005 for July, August, September, and October. In all three regions winter temperatures and NDVI values in 2006 were generally greater than in 2005 while winter precipitation in 2006 was lower than in 2005. During the spring and summer months when mosquito populations are typically highest, the conditions were reversed. 105
Population Density (mean daily trap count/month) Population Density (mean daily trap count/month) 20 18 16 14 12 10 8 6 4 2 Northern Virginia 0 Jan Apr Jul Oct Jan Apr Jul Oct 20 18 16 14 12 10 8 6 4 2 Northern Virginia Month (2005-2006) 0 Jan Apr Jul Oct Jan Apr Jul Oct Month (2005-2006) 106 1.0 0.8 0.6 0.4 0.2 0.0 -0.2 NDVI & NDVI Anomaly (NDVI units) Monthly Mean Mosquito Count Monthly Mean NDVI NDVI Anomaly Long-term Mean NDVI 100 80 60 40 20 0 Temperature (°F) 160 140 120 100 80 60 40 20 0 Precipitation (mm) Monthly Mean Mosquito Count Monthly Mean Max Temp Monthly Mean Min Temp Long-term Mean Max Temp Long-term Mean Min Temp Monthly Mean PPT (2 month avg) Long-term Mean PPT Figure 4.4. Monthly mean number of RVF competent vectors collected per month for 2005- 2006 in the Northern Virginia region. In Figure A the mosquito counts are plotted with monthly and long-term mean NDVI and NDVI anomaly. In Figure B, the mosquito counts are plotted with monthly mean and long-term mean minimum and maximum temperature and monthly and long-term mean precipitation. A B
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Using Remote Sensing, Ecological Ni
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DEDICATION This is dedicated to my
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Lastly, I would like to thank all o
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CHAPTER 4: RESULTS ................
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LIST OF FIGURES Figures Page 2.1 Kn
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AUC - Area Under the Curve LIST OF
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ABSTRACT USING REMOTE SENSING, ECOL
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Keywords Rift Valley fever, risk as
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systematically inventory and monito
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populations), human demographics an
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The geographic distribution of pote
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human and animal health, economic l
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1.8 ORGANIZATION OF DISSERTATION Th
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(e.g., ether, chloroform), detergen
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(Imam et al. 1979, Davies and Marti
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have demonstrated that wild ruminan
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flooding of grassland depressions c
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and created mosquito breeding habit
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may transmit the RVF virus mechanic
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virus during inter-epizootic period
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grown by nearly 9% per year (Tatem
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animals during RVF outbreaks or col
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sufficient and continued contact be
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Environmental factors are directly
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animals could arrive in an uninfect
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GIS technology and RS data has been
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NDVI is calculated as a normalized
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In September 2006, the RVF forecast
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In the U.S. RVF is not present and
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changes in mosquito populations in
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hosts that are widely dispersed thr
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mountain range of the Appalachian M
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The land area of Hampton Roads incl
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52 Table 3.1. Primary data sets and
Page 69 and 70: Table 3.2. Sources of Virginia mosq
Page 71 and 72: Figure 3.3. Cattle Density in Virgi
Page 73 and 74: Figure 3.6. 2006 Deer Abundance Est
Page 75 and 76: Land-Cover Global land-cover data a
Page 77 and 78: Figure 3.8. Virginia Land-cover Nor
Page 79 and 80: Figure 3.9. June 2006 Normalized Di
Page 81 and 82: Table 3.4. Worldclim interpolated c
Page 83 and 84: 3.2.5 DATA PROCESSING All data sets
Page 85 and 86: normalize differences among surveil
Page 87 and 88: for three regions of Virginia - Nor
Page 89 and 90: Correlation analyses The Pearson‟
Page 91 and 92: of maximum entropy (i.e., that is m
Page 93 and 94: When test data are available, MaxEn
Page 95 and 96: Algebra tool in the ArcGIS Spatial
Page 97 and 98: CHAPTER 4. RESULTS 4.1 POTENTIAL RV
Page 99 and 100: 1. If a native U.S. vector can tran
Page 101 and 102: Bioecology of Species Selected for
Page 103 and 104: ditches, animal waste lagoons, and
Page 105 and 106: 90 Mosquito Species Typical Habitat
Page 107 and 108: The majority of mosquitoes were col
Page 109 and 110: Table 4.5. Virginia competent vecto
Page 115 and 116: 4.3 MOSQUITO DENSITY CORRELATIONS W
Page 117 and 118: 102 Table 4.8. Mean and range of ea
Page 119: Regional graphical analyses In Figu
Page 123 and 124: Population Density (mean daily trap
Page 125 and 126: Competent vector species were plott
Page 127 and 128: Population Density (mean daily trap
Page 129 and 130: Predictor correlation analyses Whil
Page 131 and 132: temperature of the coldest month (b
Page 133 and 134: data. Mosquito populations tend to
Page 135 and 136: 120 Predictor Variable Northern Vir
Page 137 and 138: 122 was 0.003. At this threshold, t
Page 139 and 140: 124 The Jackknife test of variable
Page 141 and 142: 126 4.5 RISK OF RVF ESTABLISHMENT A
Page 143 and 144: 128 The weighted suitability modeli
Page 145 and 146: CHAPTER 5. DISCUSSION 5.1 ENVIRONME
Page 147 and 148: heavily on rainfall as do the predo
Page 149 and 150: 5.2 ENVIRONMENTAL-CLIMATIC VARIABLE
Page 151 and 152: study; predicted suitable habitat w
Page 153 and 154: state. The high risk in this region
Page 155 and 156: The results of this study indicate
Page 157 and 158: It is recommended that species dive
Page 159 and 160: individually and over smaller time
Page 161 and 162: 146 APPENDIX A: RVF COMPETENT VECTO
Page 163 and 164: 148 Figure A.3. Ae. sollicitans dis
Page 165 and 166: 150 Figure A.5. Ae. triseriatus dis
Page 167 and 168: 152 Figure A.7. Cx. pipiens distrib
Page 169 and 170: 154 Figure A.9. Cx. salinarius dist
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Desiccation - drying. Diapause - ph
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Larva - immature form of certain or
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Vector competence - the vector comp
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REFERENCES Ackerman GA, Giroux J. A
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Brown H, Duik-Wasser M, Andreadis T
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Diallo M, Nabeth P, Ba K, Sall AA,
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Glass GE, Cheek JE, Patz JA, Shield
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Komar O, Robbins MB, Klenk K, Blitv
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NASA Earth Observatory (EO) Measuri
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Phillips SJ, Dudík M, Schapire RE.
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Tatem AJ, Hay SI, Rogers DJ. Global
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WHO Disease Outbreak News [Internet
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