Effects of predation by the copepod Mesocyclops ogunnus on the sex ratios of mosquito Aedes albopictus

Cardôso, Helton Charllys Batista; Silva, Bruna Queiroz da; Assis, Thiago Brandão de; Lopez, Luiz Carlos Serramo

doi:10.1007/s10750-012-1379-3

Cited by 11 publications

(12 citation statements)

References 30 publications

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“…One possible explanation for this is that the increased nutrient availability for each larva at lower densities might better support the larger body size of females. Thus, lower larval density resulting from predation, is likely to be the main cause of the female-dominated sex ratio that was previously observed [42].…”

Section: Discussionmentioning

confidence: 92%

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No impact of biocontrol agent’s predation cues on development time or size of surviving Aedes albopictus under optimal nutritional availability

Russell

Cator

2021

Preprint

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Background: Cyclopoid copepods have been applied successfully to limit populations of highly invasive Aedes albopictus mosquitoes that can vector diseases, including chikungunya, dengue, yellow fever, and Zika, to humans. However, there is concern that changes in certain vector traits, induced by exposure to copepod predation, might increase the risk of disease transmission. In this study, we tested whether cyclopoid copepod predation has sublethal effects on the development time or adult size of Ae. albopictus under the scenario of an invasion in southeast England, which lies at the northern edge of the vector′s expanding global range. Methods: Third instar Ae. albopictus larvae, hereafter referred to as ″focal individuals″, were placed in individual Petri dishes, each containing four newly-hatched Ae. albopictus larvae, which were counted, removed, and replaced daily. All focal individuals were provided with fish food ad libitum, and half were exposed to Megacyclops viridis copepod predators. The day of pupation was recorded for each focal individual, and the wing length of each focal adult was also measured. Results: Exposing late instar Ae. albopictus to predation decreased their chances of surviving to adulthood. Mortality of the focal individuals was 12.9% in the predator treatment, and 2.9% in the controls. Three focal larvae that died in the predator treatment showed signs of melanization, indicative of wounding. Among surviving Ae. albopictus, no significant difference in either pupation day or wing length was observed due to copepod predation. Conclusions: We found that M. viridis predation on smaller Ae. albopictus larvae does not significantly affect the pupation day or adult size of surrounding larger larvae that are less vulnerable to copepod attacks. This study controlled for density effects on size by maintaining a constant number of newly-hatched prey larvae surrounding each focal larva. Those working to control Ae. albopictus populations in the field should be made aware that increased adult body size can occur if copepod biocontrol agents are applied at lower than necessary levels. The absence of a significant sublethal impact from M. viridis copepod predation on surviving later-stage larvae in this analysis supports the use of M. viridis as a biocontrol agent.

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Section: Discussionmentioning

confidence: 92%

“…A longer (five-week) semi-field study found that the Ae. albopictus sex ratio was skewed towards females after extended exposure to cyclopoid copepod predation [42]. However, lower larval densities have been shown to produce lower proportions of males in Ae.…”

Section: Discussionmentioning

confidence: 99%

No impact of biocontrol agent’s predation cues on development time or size of surviving Aedes albopictus under optimal nutritional availability

Russell

Cator

2021

Preprint

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“…Pipiens, respectively [13] [34]. [35] found that copepod predation significantly biased mosquito sex ratios toward females, and that both the males and females emerging from copepod-containing recipients were significantly larger than control insects.…”

Section: Resultsmentioning

confidence: 97%

Effectiveness of Copepod, <i>Acanthocyclops vernalis</i> on Dengue Fever Victor, <i>Aedes aegypti</i> under Laboratory Conditions in Jeddah, Saudi Arabia

Alshammari¹,

Alshammari²,

Abdelmageed³

et al. 2015

OJE

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A. aegypti, the primary carrier for dengue viruses that cause dengue fever and are widespread over large areas of the tropics and subtropics. The copepod, Acanthocyclops vernalis was collected from a pond located in Hail, a city in northwestern Saudi Arabia. A. aegypti colonies established from Laboratory of Public Health Pests, Jeddah Municipality, Jeddah, Saudi Arabia. In the laboratory, the predatory capacity of copepod predator A. vernalis tested on first and second instars of Aedes aegypti. A single adult female of A. vernalis was tested against 50 larvae of A. aegypti in case the presence and absence of an alternative food. Several doses of A. vernalis (10, 15, 20 and 25 adults) against 100 larvae of mosquito were tested also in case the presence and absence of an alternative food under laboratory conditions.

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“…These copepods have been known to be a vector of guinea worm Dracunculus medinensis which is a human parasite. Moreover, the copepods can be involved in the transmission of other diseases such as cholera if they are introduced in the drinking water [27]. Since these copepods can cause epidemics, introducing these diseases while controlling the mosquito-borne diseases would not be a suitable option.…”

Section: Limitations Of Using Cyclopoid Copepodsmentioning

confidence: 99%

Mosquito control methods and their limitations

Chaudhry

Jabeen

Sarfraz³

et al. 2019

PAB

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Mosquitoes represent the major vectors involved in the spread of deadly diseases like Malaria, Lymphatic filariasis,Chikungunyaand arboviruses like dengue virus and Zika virus. These diseases have emerged with the rise of urbanization and the use of chemical insecticides around the world. The insecticides such as DDT (Dichlorodiphenyltrichloroethane), organophosphates, carbamates, and organochlorineshave caused resistance in mosquitoes against typical chemical control methodsthrough excessive use over the years. Different biological control methods aresustainable, eco-friendly and target major diseases spreading mosquito's species. This review outlines major biological control methods being used ortested in different parts of the world. Some of these are the use of plant extract, Wolbachiaspp, larvivorous fishes, insecticidal bacterial spp, predator mosquitoes and predator copepods.Limitations associated with each method are also discussed.All these methods will givea better understanding of developing an integrated approach for effective mosquitoes control that will reduce dependency on insecticide based approaches.

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Effects of predation by the copepod Mesocyclops ogunnus on the sex ratios of mosquito Aedes albopictus

Cited by 11 publications

References 30 publications

No impact of biocontrol agent’s predation cues on development time or size of surviving Aedes albopictus under optimal nutritional availability

No impact of biocontrol agent’s predation cues on development time or size of surviving Aedes albopictus under optimal nutritional availability

Effectiveness of Copepod, <i>Acanthocyclops vernalis</i> on Dengue Fever Victor, <i>Aedes aegypti</i> under Laboratory Conditions in Jeddah, Saudi Arabia

Mosquito control methods and their limitations

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Effects of predation by the copepod Mesocyclops ogunnus on the sex ratios of mosquito Aedes albopictus

Cited by 11 publications

References 30 publications

No impact of biocontrol agent’s predation cues on development time or size of surviving Aedes albopictus under optimal nutritional availability

No impact of biocontrol agent’s predation cues on development time or size of surviving Aedes albopictus under optimal nutritional availability

Effectiveness of Copepod, &lt;i&gt;Acanthocyclops vernalis&lt;/i&gt; on Dengue Fever Victor, &lt;i&gt;Aedes aegypti&lt;/i&gt; under Laboratory Conditions in Jeddah, Saudi Arabia

Mosquito control methods and their limitations

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Effectiveness of Copepod, <i>Acanthocyclops vernalis</i> on Dengue Fever Victor, <i>Aedes aegypti</i> under Laboratory Conditions in Jeddah, Saudi Arabia