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Open AccessArticle

Climate Change May Restrict the Predation Efficiency of Mesocyclops aspericornis (Copepoda: Cyclopidae) on Aedes aegypti (Diptera: Culicidae) Larvae

1
Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan
2
Institute of Tropical Medicine, Nagasaki University, Nagasaki 852-8523, Japan
3
Department of Medical Entomology and Zoology, National Institute of Hygiene and Epidemiology, Hanoi 100000, Vietnam
*
Author to whom correspondence should be addressed.
Insects 2020, 11(5), 307; https://doi.org/10.3390/insects11050307
Received: 31 March 2020 / Revised: 12 May 2020 / Accepted: 13 May 2020 / Published: 14 May 2020
(This article belongs to the Special Issue Insects-Environment Interaction)
(1) Dengue is the most spread mosquito-borne viral disease in the world, and vector control is the only available means to suppress its prevalence, since no effective treatment or vaccine has been developed. A biological control program using copepods that feed on mosquito larvae has been practiced in Vietnam and some other countries, but the application of copepods was not always successful. (2) To understand why the utility of copepods varies, we evaluated the predation efficiency of a copepod species (Mesocyclops aspericornis) on a vector species (Aedes aegypti) by laboratory experiments under different temperatures, nutrition and prey-density conditions. (3) We found that copepod predation reduced intraspecific competition among Aedes larvae and then shortened the survivor’s aquatic life and increased their pupal weight. In addition, the predatory efficiency of copepods was reduced at high temperatures. Furthermore, performance of copepod offspring fell when the density of mosquito larvae was high, probably because mosquito larvae had adverse effects on copepod growth through competition for food resources. (4) These results suggest that the increase in mosquitoes will not be suppressed solely by the application of copepods if the density of mosquito larvae is high or ambient temperature is high. We need to consider additional control methods in order to maintain the efficiency of copepods to suppress mosquito increase. View Full-Text
Keywords: Aedes aegypti; biological control; copepod; dengue fever Aedes aegypti; biological control; copepod; dengue fever
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MDPI and ACS Style

Tuno, N.; Phong, T.V.; Takagi, M. Climate Change May Restrict the Predation Efficiency of Mesocyclops aspericornis (Copepoda: Cyclopidae) on Aedes aegypti (Diptera: Culicidae) Larvae. Insects 2020, 11, 307. https://doi.org/10.3390/insects11050307

AMA Style

Tuno N, Phong TV, Takagi M. Climate Change May Restrict the Predation Efficiency of Mesocyclops aspericornis (Copepoda: Cyclopidae) on Aedes aegypti (Diptera: Culicidae) Larvae. Insects. 2020; 11(5):307. https://doi.org/10.3390/insects11050307

Chicago/Turabian Style

Tuno, Nobuko; Phong, Tran V.; Takagi, Masahiro. 2020. "Climate Change May Restrict the Predation Efficiency of Mesocyclops aspericornis (Copepoda: Cyclopidae) on Aedes aegypti (Diptera: Culicidae) Larvae" Insects 11, no. 5: 307. https://doi.org/10.3390/insects11050307

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