Anopheles Species Composition and Breeding Habitat Characterisation in Chiredzi District, Zimbabwe

2020 ◽  
Vol 28 (1) ◽  
pp. 84 ◽  
Author(s):  
M.P. Zengenene ◽  
W. Soko ◽  
B.D. Brooke ◽  
L.L. Koekemoer ◽  
J. Govere ◽  
...  
Keyword(s):  
Species Composition ◽  
Breeding Habitat ◽  
Anopheles Species ◽  
Habitat Characterisation

scholarly journals A survey of Anopheles species composition and insecticide resistance on the island of Bubaque, Bijagos Archipelago, Guinea-Bissau

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Thomas Ant ◽  
Erin Foley ◽  
Scott Tytheridge ◽  
Colin Johnston ◽  
Adriana Goncalves ◽  
...  
Keyword(s):  
Species Composition ◽  
Insecticide Resistance ◽  
Anopheles Species ◽  
Guinea Bissau

Anopheles species composition and some climatic factors that influence their survival and population abundance in Anambra East LGA, Anambra State, Nigeria

2020 ◽  
Vol 41 (2) ◽  
Author(s):  
C.M Egbuche ◽  
A.E Onyido ◽  
P.U Umeanaeto ◽  
E.N Nwankwo ◽  
I.F Omah ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Species Composition ◽  
Climatic Factors ◽  
Seasonal Abundance ◽  
Human Landing Catch ◽  
Morphological Identification ◽  
Climatic Data ◽  
Anopheles Species ◽  
Anambra State ◽  
Anopheles Mosquitoes

Malaria parasites are transmitted in nature through the bites of female Anopheles mosquitoes. However, the vector distribution varies in time and space. This study aimed to determine the species composition, abundance and climatic factors influencing Anopheles mosquitoes in Anambra East Local Government Area of Anambra State, Nigeria from October 2016 to September 2017. Adult Anopheles mosquitoes were collected from indoor and outdoor locations using Pyrethrum Knockdown Collection (PKC) and Human Landing Catch (HLC) Methods respectively. Anopheles mosquito larvae were collected using dipping method. Morphological identification of Anopheles species was carried out using standard identification keys. Climatic data was obtained from Nigerian Meteorological Agency Office in Anambra State. A total of 8181 female Anopheles mosquitoes which comprised 4127 (50.4%) larvae and 4054 (49.6%) adults were collected (P > 0.05) in the study. Four Anopheles species: An. gambiae s. l (70.1%), An. funestus group (18.2%), An. moucheti (6.3%) and An. nili (5.4%) were identified (P < 0.05). In the study area, 2608 (31.9%), 3025 (37.0%) and 2548 (31.1%) Anopheles mosquitoes were collected from Aguleri, Igbariam and Nsugbe respectively; with 100% species overlap. In each selected selected town, the Simpson’s index of diversity was ~2 and Shannon-wiener diversity was ~1. Only An. gambiaes l showed varied seasonal abundance with wet season contributing 67.9% and dry season 32.1% of the overall An. gambiaes. l collection (P < 0.05). The correlation between rainfall and An. gambiae s. l. abundance was significantly strong (r = 0.66; P < 0.05). No significant correlation was found between Anopheles species abundance and temperature as well as relative humidity. The study revealed the preponderance of four Anopheles species: An. gambiae s. l., An. funestus, An. moucheti and An. nili; and rainfall is the only climatic factor that causes temporal change in the abundance of one of the species, An. gambiaes. l. in the study area. Keywords: Anopheles mosquitoes, abundance, temperature, rainfall, relative humidity

Morphological Identification, Species Composition and Distribution of Mosquitoes in Kosti region, White Nile State, Central Sudan

2019 ◽  
Vol 6 (1) ◽  
pp. 7-18
Author(s):  
Mai M. Nour ◽  
Mariam Atta Elmannan Aboud ◽  
Nahla Osman Mohamed Ali
Keyword(s):  
Species Composition ◽  
Morphological Identification ◽  
Correct Identification ◽  
Anopheles Species ◽  
Mosquito Abundance ◽  
Central Sudan ◽  
Global Positioning ◽  
White Nile ◽  
Species Composition And Distribution ◽  
Vector Control Strategy

Mosquitoes are a large diverse group of insects, with members being most important as vectors of diseases. The correct identification of mosquitoes is crucial to the control of the mosquito-borne diseases. This study was designed to provide baseline data on the species composition and distribution of members of the Anophelines and Culicines genera in ten selected localities in Kosti region, White Nile State, Central Sudan. Global Positioning System (GPS) was used to select collection sites. Adult mosquitoes were collected by pyrethrum spray catch (PSC) from randomly selected houses in Allia, Alnsr, Alskahdeed, Almrabie, Alshati, Althwrat, Alraba, Block 26, Block 32 and Khadugli in Kosti region during September 2014-August 2015. The Anophelines and Culicines mosquitoes were identified using standard morphological keys. Two Anopheles species and three Culex species were morphologically identified. These were An. gambiae s.s.; An. pharoensis; Cx. quinquefasciatus; Cx. univittatus and Cx. pipiens. This is the first report of An. pharoensis in the study area. The Highest mosquito abundance was observed in the September followed by October, while the lowest mosquito abundance was in July. An. gambiae s.s and Cx. quinquefasciatus were the predominant species which has importance as they indicate the presence of Malaria and arboviral infections in the study areas; respectively. These findings are of importance in the planning and implementation of vector control strategy in the Kosti region, White Nile state.  

scholarly journals The effect of water physical quality and water level changes on the occurrence and density of larvae of <i>Anopheles</i> mosquitoes around the shoreline of the Koka reservoir, Central Ethiopia

2010 ◽  
Vol 7 (4) ◽  
pp. 6025-6055
Author(s):  
B. M. Teklu ◽  
H. Tekie ◽  
M. McCartney ◽  
S. Kibret
Keyword(s):  
Species Composition ◽  
Water Level ◽  
Physical Characteristics ◽  
Breeding Habitat ◽  
Aquatic Habitats ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Anopheles Mosquitoes ◽  
Water Level Changes ◽  
Breeding Habitats

Abstract. Entomological studies to determine the effect of the physical characteristics of larval breeding water bodies and reservoir water level changes on the occurrence of Anopheles mosquito larvae and on the spatial and temporal formation of larval breeding habitats were conducted in two villages at Koka reservoir between August and December 2007. Of the two study villages, Ejersa is in close proximity to the reservoir, and Kuma is 5 km away from it. Data on the type, number and physical characteristics of Anopheles larval breeding habitat, species composition and densities of anopheles mosquitoes in and around the study villages were investigated and recorded. Meteorological and reservoir water level data were compared with availability of Anopheles larval breeding sites and densities. Entomological data from the weekly larval collections showed that Anopheles pharoensis Theobald, Anopheles gambiae s.l. Giles, Anopheles coustani Laveran and Anopheles squamosus Theobald were breeding in the study area. The mean larval density of A. gambiae s.l. in this study was higher in slightly turbid and shallow aquatic habitats than in turbid and relatively deep aquatic habitats (F=16.97, p<0.05 and F=6.03, p<0.05, respectively). The density of A. pharoensis in habitat with floating vegetation and with relatively shady conditions was significantly higher than that of less shaded aquatic habitat and greater emergent vegetation (F=15.75, p<0.05 and F=10.56, p<0.05, respectively). There was also a positive correlation between the occurrence of Anopheles larvae with water temperature of the breeding habitat and daily minimum atmospheric temperature (r=0.541, p<0.05 and r=0.604, p<0.05, respectively). Similarly, there was a positive correlation between falling reservoir water levels and the number of positive breeding habitats at Ejersa during the sampling period (r=0.605, p<0.05). Results in this study show that physical characteristics such as water temperature, turbidity, depth and vegetation cover play an important role in the species composition, total Anopheles larval count, and the density of Anopheles mosquitoes in the vicinity. The proliferation of suitable breeding habitats around the reservoir villages is strongly associated with reservoir water level changes. This is particularly important for A. pharoensis and A. arabiensis which are important vectors of malaria in the area. Further investigation on the species diversity, physical and chemical habitat characteristics and impact of water holding capacity of the soil need to be done to generate detailed baseline data which will serve as a basis for proper water management activities for malaria risk mitigation.

scholarly journals Impact of sugarcane irrigation on malaria vector Anopheles mosquito fauna, abundance and seasonality in Arjo-Didessa, Ethiopia

2020 ◽  
Author(s):  
Assalif Demissew Shifera ◽  
Dawit Hawaria ◽  
Solomon Kibret ◽  
Abebe Animut ◽  
Arega Tsegaye ◽  
...  
Keyword(s):  
Species Composition ◽  
Malaria Vector ◽  
Mosquito Species ◽  
Malaria Vectors ◽  
Anopheline Mosquito ◽  
Chi Square ◽  
Anopheles Species ◽  
Mosquito Abundance ◽  
Anopheles Mosquitoes ◽  
The Impact

Abstract Background: Although irrigation activities are increasing in Ethiopia, limited studies evaluated their impact on malaria vector mosquito composition, abundance and seasonality. This study aimed at evaluating the impact of sugarcane irrigation on species composition, abundance and seasonality of malaria vectors. Methods : Adult Anopheles mosquitoes were collected using CDC light traps from three irrigated and three non-irrigated clusters in and around Arjo-Didessa sugarcane irrigation scheme in southwestern Ethiopia. Mosquito collections were conducted in four seasons: two wet and two dry, in 2018 and 2019. Mosquito species composition, abundance and seasonality were compared between irrigated and non-irrigated clusters. Anopheles mosquitoes were identified to species using morphological keys and An. gambiae s.l to sibling species using PCR. Chi-square was used to analyze the association between Anopheles species occurrence and environmental and seasonal parameters. Results: Overall, 2,108 female Anopheles mosquitoes comprising of six species were collected. Of these, 92.7% (n=1954) were from irrigated clusters and 7.3% (n=154) from the non-irrigated. An. gambiae s.l was the most abundant (67.3%) followed by An. coustani complex (25.3 %) and An. pharoensis (5.7%). PCR based identification revealed that 74.7% (n=168) of the An. gambiae s.l were An. arabiensis and 22.7% (n=51) An. amharicus . Density of An. gambiae s.l. (both indoor and outdoor) was higher in irrigated than non-irrigated clusters. The overall anopheline mosquito abundance during the wet seasons (87.2%; n=1837) was higher than the dry seasons (12.8%; n=271). Conclusion : The ongoing sugarcane irrigation activities in Arjo-Didessa created conditions suitable for increased malaria transmitting Anopheles species diversity and abundance. This in turn could drive malaria transmission in Arjo-Didessa and its environs in both dry and wet seasons. Thus, currently practiced malaria vector interventions need to be strengthened and consider larval source management to reduce vector abundance in the irrigated areas. Key Words: Malaria, Irrigation, Anopheles mosquitoes, vector density, An. amharicus , Ethiopia

Anopheles species composition and entomological parameters in malaria endemic localities of North West Colombia

Acta Tropica ◽  
2019 ◽  
Vol 190 ◽  
pp. 13-21 ◽  
Author(s):  
Nelson Naranjo-Díaz ◽  
Mariano Altamiranda-Saavedra ◽  
Margarita M. Correa
Keyword(s):  
Species Composition ◽  
Anopheles Species ◽  
North West

scholarly journals The effect of physical water quality and water level changes on the occurrence and density of <i>Anopheles</i> mosquito larvae around the shoreline of the Koka reservoir, central Ethiopia

2010 ◽  
Vol 14 (12) ◽  
pp. 2595-2603 ◽  
Author(s):  
B. M. Teklu ◽  
H. Tekie ◽  
M. McCartney ◽  
S. Kibret
Keyword(s):  
Species Composition ◽  
Water Level ◽  
Aquatic Habitat ◽  
Physical Characteristics ◽  
Breeding Habitat ◽  
Mosquito Larvae ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Anopheles Mosquitoes ◽  
Water Level Changes

Abstract. Entomological studies to determine the effect of the physical characteristics of mosquito larval breeding water bodies and reservoir water level changes on the occurrence of Anopheles mosquito larvae were conducted in two villages at Koka reservoir in central Ethiopia between August and December 2007. Of the two study villages, Ejersa is located close to the reservoir, and Kuma is 5 km away from it. Data on the type, number and physical characteristics of Anopheles larval breeding habitat, species composition and densities of anopheles mosquitoes in and around the study villages were investigated and recorded. Meteorological and reservoir water level data were compared with availability of Anopheles larval breeding sites and densities. Entomological data, derived from weekly larval collections, showed that Anopheles pharoensis Theobald, Anopheles gambiae s.l. Giles, Anopheles coustani Laveran and Anopheles squamosus Theobald were breeding in the study area. The mean larval density of An. gambiae s.l. in this study was higher in slightly turbid and shallow aquatic habitat than in turbid and relatively deep aquatic habitat. The density of An. pharoensis in habitat with floating vegetation and with relatively shady conditions was significantly higher than that of less shaded aquatic habitat and greater emergent vegetation. There was also a positive correlation between the occurrence of Anopheles larvae with the water and daily minimum atmospheric temperature. Similarly at Ejersa, over the sampling period, there was a positive correlation between falling reservoir water levels and the number of positive breeding habitats. These results confirm that physical characteristics of the water bodies play an important role in the species composition, total Anopheles larval count, and the density of Anopheles mosquitoes. Suitable breeding habitat in the vicinity of the reservoir village was strongly associated with the reservoir. This is particularly important for An. pharoensis and An. gambiae s.l. which are important vectors of malaria in the area.

scholarly journals Anopheles species composition explains differences in Plasmodium transmission in La Guajira, northern Colombia

2014 ◽  
Vol 109 (7) ◽  
pp. 952-956 ◽  
Author(s):  
Manuela Herrera-Varela ◽  
Lorena I Orjuela ◽  
Cilia Peñalver ◽  
Jan E Conn ◽  
Martha L Quiñones
Keyword(s):  
Species Composition ◽  
Anopheles Species ◽  
Plasmodium Transmission

scholarly journals Impact of sugarcane irrigation on malaria vector Anopheles mosquito fauna, abundance and seasonality in Arjo-Didessa, Ethiopia

2020 ◽  
Author(s):  
Assalif Demissew Shifera ◽  
Dawit Hawaria ◽  
Solomon Kibret ◽  
Abebe Animut ◽  
Arega Tsegaye ◽  
...  
Keyword(s):  
Species Composition ◽  
Malaria Vector ◽  
Mosquito Species ◽  
Molecular Techniques ◽  
Anopheline Mosquito ◽  
Anopheles Species ◽  
Gambiae Complex ◽  
Mosquito Abundance ◽  
Anopheles Mosquitoes ◽  
The Impact

Abstract BackgroundDespite extensive irrigation development in Ethiopia, limited studies assessed the impact of irrigation on malaria vector mosquito composition, abundance and seasonality. This study aimed to evaluate the impact of sugarcane irrigation on species composition, abundance and seasonality of malaria vectors.MethodsAdult Anopheles mosquitoes were collected using CDC light traps from three irrigated and three non-irrigated clusters in and around Arjo-Didessa sugarcane irrigation scheme in southwestern Ethiopia. Mosquitoes were surveyed in four seasons: two wet and two dry, in 2018 and 2019. Mosquito species composition, abundance and seasonality were compared between irrigated and non-irrigated clusters. Anopheles mosquitoes were sorted out to species using morphological keys and molecular techniques. Chi-square was used to test the relationships between Anopheles species occurrence, and environmental and seasonal parameters.ResultsOverall, 2,108 female Anopheles mosquitoes comprising of six species were collected. Of these, 92.7% (n=1,954) were from irrigated clusters and 7.3% (n=154) from the non-irrigated. The Anopheles gambiae complex was the most abundant (67.3%) followed by Anopheles coustani complex (25.3 %) and Anopheles pharoensis (5.7%). PCR-based identification revealed that 74.7% (n=168) of the An. gambiae comlex were Anopheles arabiensis and 22.7% (n=51) Anopheles amharicus. The density of An. gambiae complex (both indoor and outdoor) was higher in irrigated than non-irrigated clusters. The overall anopheline mosquito abundance during the wet seasons (87.2%; n=1,837) was higher than the dry seasons (12.8%; n=271).ConclusionThe ongoing sugarcane irrigation activities in Arjo-Didessa created conditions suitable for malaria transmitting Anopheles species diversity and abundance. This could drive malaria transmission in Arjo-Didessa and its environs in both dry and wet seasons. Currently practiced malaria vector interventions need to be strengthened by including larval source management to reduce vector abundance in the irrigated areas.

scholarly journals Impact of Sugarcane Irrigation on Malaria Vector Anopheles Mosquito Fauna, Abundance and Seasonality in Arjo-Didessa, Ethiopia

2020 ◽  
Author(s):  
Assalif Demissew Shifera ◽  
Dawit Hawaria ◽  
Solomon Kibret ◽  
Abebe Animut ◽  
Arega Tsegaye ◽  
...  
Keyword(s):  
Species Composition ◽  
Malaria Vector ◽  
Mosquito Species ◽  
Malaria Vectors ◽  
Anopheline Mosquito ◽  
Chi Square ◽  
Anopheles Species ◽  
Mosquito Abundance ◽  
Anopheles Mosquitoes ◽  
The Impact

Abstract Background: Although irrigation activities are increasing in Ethiopia, limited studies evaluated their impact on malaria vector mosquito composition, abundance and seasonality. This study aimed at evaluating the impact of sugarcane irrigation on species composition, abundance and seasonality of malaria vectors. Methods: Adult Anopheles mosquitoes were collected using CDC light traps from three irrigated and three non-irrigated clusters in and around Arjo-Didessa sugarcane irrigation scheme in southwestern Ethiopia. Mosquito collections were conducted in four seasons: two wet and two dry, in 2018 and 2019. Mosquito species composition, abundance and seasonality were compared between irrigated and non-irrigated clusters. Anopheles mosquitoes were identified to species using morphological keys and An. gambiae s.l to sibling species using PCR. Chi-square was used to analyze the association between Anopheles species occurrence and environmental and seasonal parameters. Results: Overall, 2,108 female Anopheles mosquitoes comprising of six species were collected. Of these, 92.7% (n=1954) were from irrigated clusters and 7.3% (n=154) from the non-irrigated. An. gambiae s.l was the most abundant (67.3%) followed by An. coustani complex (25.3 %) and An. pharoensis (5.7%). PCR based identification revealed that 74.7% (n=168) of the An. gambiae s.l were An. arabiensis and 22.7% (n=51) An. amharicus. Density of An. gambiae s.l. (both indoor and outdoor) was higher in irrigated than non-irrigated clusters. The overall anopheline mosquito abundance during the wet seasons (87.2%; n=1837) was higher than the dry seasons (12.8%; n=271). Conclusion: The ongoing sugarcane irrigation activities in Arjo-Didessa created conditions suitable for increased malaria transmitting Anopheles species diversity and abundance. This in turn could drive malaria transmission in Arjo-Didessa and its environs in both dry and wet seasons. Thus, currently practiced malaria vector interventions need to be strengthened and consider larval source management to reduce vector abundance in the irrigated areas.

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