Factors influencing the abundance of Japanese encephalitis vectors in ricefields in India – II. Biotic

Sunish, I. P.; Reuben, R

doi:10.1046/j.1365-2915.2002.00325.x

Cited by 85 publications

(48 citation statements)

References 11 publications

(16 reference statements)

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“…The mosquitoes observed in the present instance exhibit a similarity with the findings of earlier studies in India (Kant et al 1998;Sunish & Reuben 2002;Sunish et al 2006) or elsewhere (Muturi et al 2008;Stoops et al 2008;Lytra & Emmanouel 2014;Ohba et al 2013Ohba et al , 2015 though the species richness remained low. This may possibly due to the sampling error or due to the restricted space included in the sampling strategy.…”

Section: Discussionsupporting

confidence: 91%

“…Empirical observations on the rice field mosquitoes in India and countries where paddy rice cultivation is a normal practice, the abundance of Anopheline and Culicine mosquitoes are guided by the environmental factors and the habitat permanence of the cultivable lands (Kant et al 1992(Kant et al , 1998Sunish & Reuben 2002;Banerjee & Chandra 2004;Keiser & al. 2005;Sunish et al 2006;Ohba et al 2013Ohba et al , 2015Lytra & Emmanouel 2014) cial determinant for the future abundance and dominance.…”

Section: Discussionmentioning

confidence: 99%

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Observations on the pupal productivity of Culex tritaeniorhynchus in rice fields of West Bengal, India: implications for vector management (Diptera: Culicidae)

et al. 2016

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The mosquito Culex tritaeniorhychus is an established vector of Japanese encephalitis in India and many Asian countries. Entomological monitoring enables estimation of the abundance of the vector mosquitoes and therefore aids in vector management and disease control. In compliance with this proposition, an assessment of the pupal productivity of the mosquito C. tritaeniorhynchus was made from selected rice fields of West Bengal, India. The results are expected to provide the present status of mosquitoes in an endemic region of Japanese encephalitis. In course of sampling of the rice fields, the mosquito C. tritaeniorhyhchus was found in abundance with other mosquitoes like Culex bitaeniorhynchus, Anopheles subpictus, Anopheles vagus, Anopheles barbirostris. Application of multivariate analysis indicated that the plant height, water depth and temperature could explain the variations in the pupal productivity of C. tritaeniorhynchus in rice fields. The correspondence of the immature abundance of C. tritaeniorhynchus with plant height suggests persistence of the population throughout the paddy rice cultivation period. Using the plant height as an indicator, the abundance of the mosquito C. tritarniorhynchus can be predicted enabling application of appropriate strategies for population intervention and thus the possibility of the disease.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Observations on the pupal productivity of Culex tritaeniorhynchus in rice fields of West Bengal, India: implications for vector management (Diptera: Culicidae)

et al. 2016

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“…23,24 The low-lying and/or rice-producing rural areas of Bangladesh are conducive to breeding the mosquito vectors ( Culex vishnui , Cx. triae- Duration of hospitalization in days, median (range) 9 (4-26) Death, no (%)…”

Section: Discussionmentioning

confidence: 99%

Hospital-Based Surveillance for Japanese Encephalitis at Four Sites in Bangladesh, 2003–2005

Hossain

Gurley

Montgomery³

et al. 2010

The American Journal of Tropical Medicine and Hygiene

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Abstract. We investigated the epidemiology and etiology of encephalitis at four tertiary hospitals in Bangladesh during [2003][2004][2005]. Patients who met a clinical case definition for acute encephalitis and had cerebrospinal fluid (CSF) pleocytosis were eligible for enrollment; a standardized sampling pattern was used to enroll eligible patients. Recent Japanese encephalitis virus (JEV) infection was defined by presence of IgM antibodies against JEV in CSF or serum. Twenty (4%) of 492 cases had laboratory evidence of recent JEV infection; two died. All JE cases occurred during May-December, and cases were identified among all age groups. All cases resided in rural areas. Fifteen patients were re-assessed 4-6 weeks after hospitalization; 5 (33%) patients had physical disabilities and 7 (47%) reported cognitive difficulties. Infection with JEV is clearly an etiology of encephalitis in Bangladesh. Population-based studies to quantify burden of disease could assess options for targeted immunization programs.

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“…Many mosquito larvae, including those of C. pipiens, are natural prey items for several backswimmer species, and thus share an evolutionary history with them (e.g. Sunish & Reuben, 2002;Chesson, 1984;Blaustein, 1998;Mogi et al, 1999). It is thus not surprising that upon a backswimmer attack, mosquitoes try most of the time to escape by becoming motionless, although other strategies are also occasionally observed (such as wriggling away) (Scott & Murdoch, 1983 ;Sih, 1979).…”

Section: Discussionmentioning

confidence: 99%

Insecticide resistance genes confer a predation cost on mosquitoes, Culex pipiens

et al. 2004

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SummaryNewly occurring adaptive genes, such as those providing insecticide resistance, display a fitness cost which is poorly understood. In order to detect subtle behavioural changes induced by the presence of resistance genes, we used natural predators and compared their differential predation on susceptible and resistant Culex pipiens mosquitoes, using strains with a similar genetic background. Resistance genes were either coding an overproduced detoxifying esterase (locus Ester), or an insensitive target (locus ace-1). Differential predation was measured between susceptible and resistant individuals, as well as among resistant mosquitoes. A backswimmer, a water measurer, a water boatman and a predaceous diving beetle were used as larval predators, and a pholcid spider as adult predator. Overall, the presence of a resistance gene increased the probability of predation : all resistance genes displayed predation costs relative to susceptible ones, at either the larval or adult stage, or both. Interestingly, predation preferences among the susceptible and the resistance genes were not ranked uniformly. Possible explanations for these results are given, and we suggest that predators, which are designed by natural selection to detect specific behavioural phenotypes, are useful tools to explore non-obvious differences between two classes of individuals, for example when they differ by the presence or absence of one recent gene, such as insecticide resistance genes.

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Factors influencing the abundance of Japanese encephalitis vectors in ricefields in India – II. Biotic

Cited by 85 publications

References 11 publications

Observations on the pupal productivity of Culex tritaeniorhynchus in rice fields of West Bengal, India: implications for vector management (Diptera: Culicidae)

Observations on the pupal productivity of Culex tritaeniorhynchus in rice fields of West Bengal, India: implications for vector management (Diptera: Culicidae)

Hospital-Based Surveillance for Japanese Encephalitis at Four Sites in Bangladesh, 2003–2005

Insecticide resistance genes confer a predation cost on mosquitoes, Culex pipiens

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