Polyandry Depends on Postmating Time Interval in the Dengue Vector Aedes aegypti

Area of Science:

• Medical Entomology
• Vector-Borne Diseases
• Behavioral Ecology

Background:

• Aedes aegypti mosquitoes transmit dengue and chikungunya viruses.
• Male seminal fluid induces female unreceptivity, but polyandry occurs.
• The timing of female unreceptivity and sustained monandry is not well understood.

Purpose of the Study:

• To determine the rate of polyandry in Aedes aegypti females based on postmating intervals.
• To investigate if females remain monandrous after multiple blood feeding and oviposition cycles.

Main Methods:

• Experiments used wild-type and fluorescent sperm Aedes aegypti.
• Polyandry rates were assessed after varying postmating intervals (0-20 hours).
• Females were tested for re-insemination after 1, 3, and 5 cycles of blood meals and oviposition.

Main Results:

• Most females became unreceptive within 2 hours post-mating.
• Polyandry rates decreased from 24% immediately after mating to 3% at 20 hours.
• No re-insemination was detected after one, three, or five blood meal and oviposition cycles.

Conclusions:

• Female Aedes aegypti unreceptivity to mating is time-dependent.
• Polyandrous behavior is significantly influenced by the postmating interval.
• Findings are crucial for gene flow modeling, mating behavior research, and genetic control strategies.