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Ecological niche modeling and land cover risk areas for rift valley fever vector, culex tritaeniorhynchus giles in Jazan, Saudi Arabia.

Sallam MF, Al Ahmed AM, Abdel-Dayem MS, Abdullah MA - PLoS ONE (2013)

Bottom Line: Eleven bioclimatic and slope attributes were found to be the significant predictors for this larval suitable breeding habitat.Among six land cover classes, the linear regression model (LM) indicated wet muddy substrate is significantly associated with high-very high suitable predicted habitats (R(2) = 73.7%, P<0.05).Also, LM indicated that total dissolved salts (TDS) was a significant contributor (R(2) = 23.9%, P<0.01) in determining mosquito larval abundance.

View Article: PubMed Central - PubMed

Affiliation: Department of Plant Protection, College of Food Sciences and Agriculture, King Saud University, Riyadh, Saudi Arabia.

ABSTRACT

Background: The mosquito, Culex tritaeniorhynchus Giles is a prevalent and confirmed Rift Valley Fever virus (RVFV) vector. This vector, in association with Aedimorphus arabiensis (Patton), was responsible for causing the outbreak of 2000 in Jazan Province, Saudi Arabia.

Methodology/principal findings: Larval occurrence records and a total of 19 bioclimatic and three topographic layers imported from Worldclim Database were used to predict the larval suitable breeding habitats for this vector in Jazan Province using ArcGIS ver.10 and MaxEnt modeling program. Also, a supervised land cover classification from SPOT5 imagery was developed to assess the land cover distribution within the suitable predicted habitats. Eleven bioclimatic and slope attributes were found to be the significant predictors for this larval suitable breeding habitat. Precipitation and temperature were strong predictors of mosquito distribution. Among six land cover classes, the linear regression model (LM) indicated wet muddy substrate is significantly associated with high-very high suitable predicted habitats (R(2) = 73.7%, P<0.05). Also, LM indicated that total dissolved salts (TDS) was a significant contributor (R(2) = 23.9%, P<0.01) in determining mosquito larval abundance.

Conclusion/significance: This model is a first step in understanding the spatial distribution of Cx. tritaeniorhynchus and consequently the risk of RVFV in Saudi Arabia and to assist in planning effective mosquito surveillance and control programs by public health personnel and researchers.

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Related in: MedlinePlus

Map of Jazan Province representing different elevation levels and annual precipitation rate.
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pone-0065786-g002: Map of Jazan Province representing different elevation levels and annual precipitation rate.

Mentions: Kingdom of Saudi Arabia (KSA) occupies approximately 2,250,000 km2 of the Arabian Peninsula with a variable topography including areas of arid, semiarid, and forested land scape. Saudi Arabia has a population of about 27 million distributed in 13 provinces, including about 11 million recent immigrants, including almost two million illegal residents [28], [29].The current study was conducted in Jazan Province, which is located in south-western Saudi Arabia (Fig. 1) and includes ∼13,432 km2[30] inhabited by 1,365,110 people averaging 117people/km2[28], [30]. The Red Sea forms the western boundary; the Republic of Yemen forms its eastern and southern boundaries, and Aseer region is the northern border [31]. Topology and climate of Jazan can be categorized into three distinct sectors: the eastern Sarawat Mountains range 2,000–2,500 m a.s.l. with an annual precipitation rate >300 mm; hilly middle areas north to south with elevation range 400–600 m a.s.l. and <300 mm rain/year; and the coastal western plains with elevation <400 m a.s.l. and little, if any, annual precipitation (Fig. 2). Overall the Province has typically two rainy seasons, May-July and September-November.


Ecological niche modeling and land cover risk areas for rift valley fever vector, culex tritaeniorhynchus giles in Jazan, Saudi Arabia.

Sallam MF, Al Ahmed AM, Abdel-Dayem MS, Abdullah MA - PLoS ONE (2013)

Map of Jazan Province representing different elevation levels and annual precipitation rate.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3675080&req=5

pone-0065786-g002: Map of Jazan Province representing different elevation levels and annual precipitation rate.
Mentions: Kingdom of Saudi Arabia (KSA) occupies approximately 2,250,000 km2 of the Arabian Peninsula with a variable topography including areas of arid, semiarid, and forested land scape. Saudi Arabia has a population of about 27 million distributed in 13 provinces, including about 11 million recent immigrants, including almost two million illegal residents [28], [29].The current study was conducted in Jazan Province, which is located in south-western Saudi Arabia (Fig. 1) and includes ∼13,432 km2[30] inhabited by 1,365,110 people averaging 117people/km2[28], [30]. The Red Sea forms the western boundary; the Republic of Yemen forms its eastern and southern boundaries, and Aseer region is the northern border [31]. Topology and climate of Jazan can be categorized into three distinct sectors: the eastern Sarawat Mountains range 2,000–2,500 m a.s.l. with an annual precipitation rate >300 mm; hilly middle areas north to south with elevation range 400–600 m a.s.l. and <300 mm rain/year; and the coastal western plains with elevation <400 m a.s.l. and little, if any, annual precipitation (Fig. 2). Overall the Province has typically two rainy seasons, May-July and September-November.

Bottom Line: Eleven bioclimatic and slope attributes were found to be the significant predictors for this larval suitable breeding habitat.Among six land cover classes, the linear regression model (LM) indicated wet muddy substrate is significantly associated with high-very high suitable predicted habitats (R(2) = 73.7%, P<0.05).Also, LM indicated that total dissolved salts (TDS) was a significant contributor (R(2) = 23.9%, P<0.01) in determining mosquito larval abundance.

View Article: PubMed Central - PubMed

Affiliation: Department of Plant Protection, College of Food Sciences and Agriculture, King Saud University, Riyadh, Saudi Arabia.

ABSTRACT

Background: The mosquito, Culex tritaeniorhynchus Giles is a prevalent and confirmed Rift Valley Fever virus (RVFV) vector. This vector, in association with Aedimorphus arabiensis (Patton), was responsible for causing the outbreak of 2000 in Jazan Province, Saudi Arabia.

Methodology/principal findings: Larval occurrence records and a total of 19 bioclimatic and three topographic layers imported from Worldclim Database were used to predict the larval suitable breeding habitats for this vector in Jazan Province using ArcGIS ver.10 and MaxEnt modeling program. Also, a supervised land cover classification from SPOT5 imagery was developed to assess the land cover distribution within the suitable predicted habitats. Eleven bioclimatic and slope attributes were found to be the significant predictors for this larval suitable breeding habitat. Precipitation and temperature were strong predictors of mosquito distribution. Among six land cover classes, the linear regression model (LM) indicated wet muddy substrate is significantly associated with high-very high suitable predicted habitats (R(2) = 73.7%, P<0.05). Also, LM indicated that total dissolved salts (TDS) was a significant contributor (R(2) = 23.9%, P<0.01) in determining mosquito larval abundance.

Conclusion/significance: This model is a first step in understanding the spatial distribution of Cx. tritaeniorhynchus and consequently the risk of RVFV in Saudi Arabia and to assist in planning effective mosquito surveillance and control programs by public health personnel and researchers.

Show MeSH
Related in: MedlinePlus