الفهرس 
Physico-chemical characteristics of the breeding sites and their effect on larval densityOnly 14 pages are availabe for public view
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Abstract
Mosquitoes are vectors for many human-threatening diseases. Investigating mosquito diversity in a particular area is essential for avoiding disease transmission through adopting an effective control measurements. For mosquito control, using insecticides with plant origin is safer for both human and the environment. The present study aimed to identify the mosquito vectors distributed throughout El-Fayoum Governorate, Egypt, during October and November 2020, and also, the study tested the toxic effect of some natural materials against mosquito larvae.
Mosquito larvae were collected from 42 breeding sites, including irrigation channels, canals, agricultural puddles, sewage tanks, stagnant water puddles, and swamps. The physicochemical characterestics of the studied breeding sites were measured. Moreover, there was a determination for the most effective bioclimatic variables that influence habitat suitability for each species by using maxent. The current study recorded five mosquito genera including nine species; Culex pipiens, Culex antennatus, Culex theileri, Culex perexiguus, Anopheles multicolor, Anopheles sergentii, Ochlerotatus caspius, Culiseta longiareolata, and Uranotaenia ungiculata. Out of them, Culex pipiens was the most abundant species. Ochlerotatus caspius and Culex antennatus revealed significant positive correlations to chloride, TDS, and EC. While Culex perexiguus only showed significant positive correlations with chloride. For bioclimatic variables, temperature and precipitation related variables were the most effective.
The toxicity of bee products (bee venom and propolis) and the commercial oils of garlic, marjoram and anise were tested against late 3rd larval instar of Culex pipiens. After 24 h of exposure, the three oils showed larvicidal activity with LC50 of 1323.81, 840.71 and 577.53 ppm for garlic, marjoram and anise, respectively. The metabolic rate change within the treated larvae was estimated through determination of total proteins, carbohydrates and lipids. Garlic oil significantly reduced protein content from 33.8± 0.98 to 30.4 ± 0.4 mg/g. Marjoram and garlic oils significantly reduced carbohydrate content from 15.76 ± 0.7 to 11.43 ± 0.66 and 11.2 ± 0.7 mg/g respectively. Anise oil significantly increased lipid content from 3.11 ± 0.21 to 3.57 ± 0.14 mg/g.
These data may contribute to establishing a database on mosquito vectors and their habitats and, hence, assist in planning and implementing the appropriate control measures in this region.
Mosquitoes are vectors for many human-threatening diseases. Investigating mosquito diversity in a particular area is essential for avoiding disease transmission through adopting an effective control measurements. For mosquito control, using insecticides with plant origin is safer for both human and the environment. The present study aimed to identify the mosquito vectors distributed throughout El-Fayoum Governorate, Egypt, during October and November 2020, and also, the study tested the toxic effect of some natural materials against mosquito larvae.
Mosquito larvae were collected from 42 breeding sites, including irrigation channels, canals, agricultural puddles, sewage tanks, stagnant water puddles, and swamps. The physicochemical characterestics of the studied breeding sites were measured. Moreover, there was a determination for the most effective bioclimatic variables that influence habitat suitability for each species by using maxent. The current study recorded five mosquito genera including nine species; Culex pipiens, Culex antennatus, Culex theileri, Culex perexiguus, Anopheles multicolor, Anopheles sergentii, Ochlerotatus caspius, Culiseta longiareolata, and Uranotaenia ungiculata. Out of them, Culex pipiens was the most abundant species. Ochlerotatus caspius and Culex antennatus revealed significant positive correlations to chloride, TDS, and EC. While Culex perexiguus only showed significant positive correlations with chloride. For bioclimatic variables, temperature and precipitation related variables were the most effective.
The toxicity of bee products (bee venom and propolis) and the commercial oils of garlic, marjoram and anise were tested against late 3rd larval instar of Culex pipiens. After 24 h of exposure, the three oils showed larvicidal activity with LC50 of 1323.81, 840.71 and 577.53 ppm for garlic, marjoram and anise, respectively. The metabolic rate change within the treated larvae was estimated through determination of total proteins, carbohydrates and lipids. Garlic oil significantly reduced protein content from 33.8± 0.98 to 30.4 ± 0.4 mg/g. Marjoram and garlic oils significantly reduced carbohydrate content from 15.76 ± 0.7 to 11.43 ± 0.66 and 11.2 ± 0.7 mg/g respectively. Anise oil significantly increased lipid content from 3.11 ± 0.21 to 3.57 ± 0.14 mg/g.
These data may contribute to establishing a database on mosquito vectors and their habitats and, hence, assist in planning and implementing the appropriate control measures in this region.