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Male accessory gland substances from Aedes albopictus affect the locomotor activity of Aedes aegypti females.

Lima-Camara TN, Codeço CT, Honório NA, Bruno RV, Peixoto AA, Lounibos LP - Mem. Inst. Oswaldo Cruz (2013)

Bottom Line: These two diurnal mosquitoes are frequently found coexisting in similar habitats, enabling interactions between adults, such as cross-mating.Virgin Ae. aegypti females injected with conspecific and heterospecific MAGs showed a general decrease in locomotor activity compared to controls and were refractory to mating with conspecific males.The reduction in diurnal locomotor activity induced by injections of conspecific or heterospecific MAGs is consistent with regulation of female reproductive activities by male substances, which are capable of sterilising female Ae. aegypti through satyrisation by Ae. albopictus.

View Article: PubMed Central - PubMed

Affiliation: Programa de Computação Científica, Programa de Computação Científica.

ABSTRACT
Dengue is one of the world's most important mosquito-borne diseases and is usually transmitted by one of two vector species: Aedes aegypti or Aedes albopictus . These two diurnal mosquitoes are frequently found coexisting in similar habitats, enabling interactions between adults, such as cross-mating. The objective of this study was to assess cross-mating between Ae. aegypti females and Ae. albopictus males under artificial conditions and evaluate the locomotor activity of Ae. aegypti virgin females injected with male accessory gland (MAG) homogenates to infer the physiological and behavioural responses to interspecific mating. After seven days of exposure, 3.3-16% of Ae. aegypti females mated with Ae. albopictus males. Virgin Ae. aegypti females injected with conspecific and heterospecific MAGs showed a general decrease in locomotor activity compared to controls and were refractory to mating with conspecific males. The reduction in diurnal locomotor activity induced by injections of conspecific or heterospecific MAGs is consistent with regulation of female reproductive activities by male substances, which are capable of sterilising female Ae. aegypti through satyrisation by Ae. albopictus.

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: William’s mean (Wm) of locomotor activity of Aedesaegypti females injected with saline (black line-control group),accessory gland (AG) of Ae. aegypti males (red line) and AG ofAedes albopictus  males (blue line) under (light dark:12:12) at 25ºC. Lines represent the 30 min mean activity (± standard error) ofcontrol and male AGs injected females in the four tested days.
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f02: : William’s mean (Wm) of locomotor activity of Aedesaegypti females injected with saline (black line-control group),accessory gland (AG) of Ae. aegypti males (red line) and AG ofAedes albopictus males (blue line) under (light dark:12:12) at 25ºC. Lines represent the 30 min mean activity (± standard error) ofcontrol and male AGs injected females in the four tested days.

Mentions: In both control and treatment groups, Ae. aegypti females showed abimodal rhythm, with peaks at the lights-on and the lights-off ( Figs 1 , 2 ). The lights-onpeak was higher in the control group whereas, in general, Ae. aegyptifemales injected with heterospecific MAG substance showed the highest peak at lights-off( Figs 1 , 2). Ae. aegypti females injected with MAGs showed a general decrease inall activity indices compared to controls ( TableI ), showed by lower arithmetic means.


Male accessory gland substances from Aedes albopictus affect the locomotor activity of Aedes aegypti females.

Lima-Camara TN, Codeço CT, Honório NA, Bruno RV, Peixoto AA, Lounibos LP - Mem. Inst. Oswaldo Cruz (2013)

: William’s mean (Wm) of locomotor activity of Aedesaegypti females injected with saline (black line-control group),accessory gland (AG) of Ae. aegypti males (red line) and AG ofAedes albopictus  males (blue line) under (light dark:12:12) at 25ºC. Lines represent the 30 min mean activity (± standard error) ofcontrol and male AGs injected females in the four tested days.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4109176&req=5

f02: : William’s mean (Wm) of locomotor activity of Aedesaegypti females injected with saline (black line-control group),accessory gland (AG) of Ae. aegypti males (red line) and AG ofAedes albopictus males (blue line) under (light dark:12:12) at 25ºC. Lines represent the 30 min mean activity (± standard error) ofcontrol and male AGs injected females in the four tested days.
Mentions: In both control and treatment groups, Ae. aegypti females showed abimodal rhythm, with peaks at the lights-on and the lights-off ( Figs 1 , 2 ). The lights-onpeak was higher in the control group whereas, in general, Ae. aegyptifemales injected with heterospecific MAG substance showed the highest peak at lights-off( Figs 1 , 2). Ae. aegypti females injected with MAGs showed a general decrease inall activity indices compared to controls ( TableI ), showed by lower arithmetic means.

Bottom Line: These two diurnal mosquitoes are frequently found coexisting in similar habitats, enabling interactions between adults, such as cross-mating.Virgin Ae. aegypti females injected with conspecific and heterospecific MAGs showed a general decrease in locomotor activity compared to controls and were refractory to mating with conspecific males.The reduction in diurnal locomotor activity induced by injections of conspecific or heterospecific MAGs is consistent with regulation of female reproductive activities by male substances, which are capable of sterilising female Ae. aegypti through satyrisation by Ae. albopictus.

View Article: PubMed Central - PubMed

Affiliation: Programa de Computação Científica, Programa de Computação Científica.

ABSTRACT
Dengue is one of the world's most important mosquito-borne diseases and is usually transmitted by one of two vector species: Aedes aegypti or Aedes albopictus . These two diurnal mosquitoes are frequently found coexisting in similar habitats, enabling interactions between adults, such as cross-mating. The objective of this study was to assess cross-mating between Ae. aegypti females and Ae. albopictus males under artificial conditions and evaluate the locomotor activity of Ae. aegypti virgin females injected with male accessory gland (MAG) homogenates to infer the physiological and behavioural responses to interspecific mating. After seven days of exposure, 3.3-16% of Ae. aegypti females mated with Ae. albopictus males. Virgin Ae. aegypti females injected with conspecific and heterospecific MAGs showed a general decrease in locomotor activity compared to controls and were refractory to mating with conspecific males. The reduction in diurnal locomotor activity induced by injections of conspecific or heterospecific MAGs is consistent with regulation of female reproductive activities by male substances, which are capable of sterilising female Ae. aegypti through satyrisation by Ae. albopictus.

Show MeSH
Related in: MedlinePlus