Effect of predators on Anopheles arabiensis and Anopheles funestus larval survivorship in Homa Bay County Western Kenya.

Autor: Orondo PW; Department of Biochemistry, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya. paulineorondo@gmail.com.; International Center of Excellence for Malaria Research, Tom Mboya University, College of Maseno University, Homa Bay, Kenya. paulineorondo@gmail.com., Zhou G; Program in Public Health, College of Health Sciences, University of California at Irvine, Irvine, CA, USA., Ochwedo KO; International Center of Excellence for Malaria Research, Tom Mboya University, College of Maseno University, Homa Bay, Kenya., Wang X; Program in Public Health, College of Health Sciences, University of California at Irvine, Irvine, CA, USA., Ondeto BM; International Center of Excellence for Malaria Research, Tom Mboya University, College of Maseno University, Homa Bay, Kenya., Lee MC; Program in Public Health, College of Health Sciences, University of California at Irvine, Irvine, CA, USA., Nyanjom SG; Department of Biochemistry, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya., Atieli H; International Center of Excellence for Malaria Research, Tom Mboya University, College of Maseno University, Homa Bay, Kenya., Githeko AK; Centre for Global Health Research, Kenya Medical Research Institute, Kisumu, Kenya., Kazura JW; Center for Global Health & Diseases, School of Medicine, Case Western Reserve University, Cleveland, OH, USA., Yan G; Program in Public Health, College of Health Sciences, University of California at Irvine, Irvine, CA, USA. guiyuny@uci.edu.
Jazyk: angličtina
Zdroj: Malaria journal [Malar J] 2023 Oct 05; Vol. 22 (1), pp. 298. Date of Electronic Publication: 2023 Oct 05.
DOI: 10.1186/s12936-023-04741-w
Abstrakt: Background: The rise of insecticide resistance against malaria vectors in sub-Saharan Africa has resulted in the need to consider other methods of vector control. The potential use of biological methods, including larvivorous fish, Bacillus thuringiensis israelensis (Bti) and plant shading, is sustainable and environmentally friendly options. This study examined the survivorship of Anopheles arabiensis and Anopheles funestus larvae and habitat productivity in four permanent habitat types in Homa Bay county, western Kenya.
Methods: Predator densities were studied in a laboratory setup while habitat productivity and larval survivorship was studied in field setup.
Results: Fish were observed as the most efficient predator (75.8% larval reduction rate) followed by water boatman (69%), and dragonfly nymph (69.5%) in predation rates. Lower predation rates were observed in backswimmers (31%), water beetles (14.9%), water spiders (12.2%), mayflies (7.3%), and tadpoles (6.9%). Increase in predator density in the field setup resulted in decreased Culex larval density. Larval and pupa age-specific distribution was determined and their survivorship curves constructed. Combined larvae (Stage I-IV) to pupa mortality was over 97% for An. arabiensis and 100% for An. funestus. The highest larval stage survival rate was from larval stages I to II and the lowest from larval stage IV to pupa. Stage-specific life tables indicated high mortality rates at every developmental stage, especially at the larval stage II and III.
Conclusion: Determination of the efficiency of various larval predators and habitat productivity will help with the correct identification of productive habitats and selection of complementary vector control methods through environmental management and/or predator introduction (for instance fish) in the habitats.
(© 2023. BioMed Central Ltd., part of Springer Nature.)
Databáze: MEDLINE
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