Jeffrey Riffell
August 30, 2024
New discoveries about how mosquitoes mate may help the fight against malaria
An international team led by researchers at the University of Washington has uncovered surprising details about mosquito mating, which could lead to improved malaria control techniques and even help develop precision drone flight. In a paper published Aug. 30 in the journal Current Biology, the team revealed that when a male Anopheles coluzzii mosquito hears the sound of female-specific wingbeats, his eyes “activate” and he visually scans the immediate vicinity for a potential mate.
June 3, 2024
Video: Before they bite — UW researcher homes in on which scents, colors make us a tempting target for hungry mosquitoes
Jeffrey Riffell, a University of Washington professor of biology, wants to understand how female mosquitoes find find a host to bite for a bloody meal. His research has shown that hungry mosquitoes find us by following a trail of scent cues, including chemicals exuded by our skin and sweat, as well as the carbon dioxide gas we exhale with each breath. Mosquitoes also like colors, at least certain ones. His team is closing in on how the sense of smell and vision work together to help a mosquito zero in for the final strike and get her blood meal.
February 8, 2024
Foul fumes pose pollinator problems
Scientists at the University of Washington have discovered that nighttime air pollution — coming primarily from car exhaust and power plant emissions — is responsible for a major drop in nighttime pollinator activity. Nitrate radicals (NO3) in the air degrade the scent chemicals released by a common wildflower, drastically reducing the scent-based cues that its chief pollinators rely on to locate the flower. The findings, published Feb. 9 in Science, are the first to show how nighttime pollution creates a chain of chemical reactions that degrades scent cues, leaving flowers undetectable by smell. The researchers also determined that pollution likely has worldwide impacts on pollination.
February 4, 2022
Mosquitoes are seeing red: Why new findings about their vision could help you hide from these disease vectors
New research led by scientists at the University of Washington indicates that a common mosquito species — after detecting a telltale gas that we exhale — flies toward specific colors, including red, orange, black and cyan. The mosquitoes ignore other colors, such as green, purple, blue and white. The researchers believe these findings help explain how mosquitoes find hosts, since human skin, regardless of overall pigmentation, emits a strong red-orange “signal” to their eyes.
August 11, 2021
‘More pepper, please’: New study analyzes role of scent compounds in the coevolution of bats and pepper plants
A study published Aug. 11 in the Proceedings of the Royal Society B by researchers at the University of Washington and Stony Brook University reports on how bats and pepper plants in Central America have coevolved to help each other survive.
April 22, 2021
UW biology professors Jeffrey Riffell, David Perkel awarded research grants from Human Frontier Science Program
UW biology professors Jeffrey Riffell and David Perkel have received grants from the Human Frontier Science Program.
January 21, 2020
Mosquitoes are drawn to flowers as much as people — and now scientists know why
Despite their reputation as blood-suckers, mosquitoes actually spend most of their time drinking nectar from flowers. Scientists have identified the chemical cues in flowers that stimulate mosquitoes’ sense of smell and draw them in. Their findings show how cues from flowers can stimulate the mosquito brain as much as a warm-blooded host — information that could help develop less toxic repellents and better traps.
July 18, 2019
Scientists discover how the mosquito brain integrates diverse sensory cues to locate a host to bite
A team, led by researchers at the University of Washington, has discovered how the female mosquito brain integrates visual and olfactory signals to identify, track and hone in on a potential host for her next blood meal: After the mosquito’s olfactory system detects certain chemical cues, the mosquito uses her visual system to scan her surroundings for certain shapes and fly toward them, presumably associating those shapes with potential hosts.
January 25, 2018
If you swat mosquitoes, they may learn to avoid your scent
In a published Jan. 25 in Current Biology, University of Washington researchers report that mosquitoes can learn to associate a particular odor with an unpleasant mechanical shock akin to being swatted. As a result, they’ll avoid that scent the next time.
July 16, 2015
UW researchers show that the mosquito smells, before it sees, a bloody feast
A team of biologists from the University of Washington and the California Institute of Technology has cracked the cues mosquitoes use to find us.
June 26, 2014
Foul fumes derail dinner for hungry moths
New research on how pollinators find flowers when background odors are strong shows that both natural plant odors and human sources of pollution can conceal the scent of sought-after flowers.
December 6, 2012
Moths wired two ways to take advantage of floral potluck
Moths are able to enjoy a pollinator’s buffet of flowers because of two distinct “channels” in their brains, scientists have discovered.
