Featured Research

from universities, journals, and other organizations

Climate, genetics can affect how long virus-carrying mosquitoes live

Date:
July 10, 2014
Source:
University of Florida Institute of Food and Agricultural Sciences
Summary:
Researchers examine survival rates for healthy mosquitoes and those carrying West Nile virus, under varying environments. The results were complicated, but intriguing. "Our results indicate that interactions between mosquitoes and arboviruses are really complex … these things that haven't really been taken into account previously might make a difference," said the lead author.

It's just math: The longer a mosquito lives, the better its odds of transmitting disease to humans or animals.

Related Articles


But as it turns out, factors such as the mosquito's own genetics and the climate it lives in have a big -- albeit complicated and not wholly understood -- role to play in its lifespan.

University of Florida researchers, hoping to better understand how West Nile virus affects mosquitoes, set up an experiment they outline in the Journal of Vector Ecology's current issue.

Mosquitoes can transmit any number of pathogens to humans, including protozoan malaria, West Nile, dengue and chikungunya viruses. Malaria cases range between 350 million and 500 million each year, with 1 million to 3 million deaths every year.

In the experiment, UF researchers examined survival rates for mosquitoes from two laboratory-reared colonies, one from Gainesville and one from Vero Beach.

Half of each of the mosquito colonies was fed West Nile virus-infected blood, the other half kept as a control population, and fed blood without the virus.

They divided the groups once more, this time keeping the mosquitoes at two temperatures, one group at 80.6 degrees, the other at 87.8 degrees Fahrenheit -- a rather large difference in temperature for cold-blooded insects.

Their findings were both unexpected and illuminating, said Barry Alto, a UF assistant professor of arbovirology based at the Florida Medical Entomology Laboratory in Vero Beach.

"Our results indicate that interactions between mosquitoes and arboviruses are really complex … these things that haven't really been taken into account previously might make a difference," said Alto, part of UF's Institute of Food and Agricultural Sciences.

The researchers found that warmer temperature shortened survival. Also, for the most part, the Vero Beach mosquitoes lived longer than those from Gainesville, indicating that some groups, or strains, of mosquitoes might just be genetically hardier than others.

They found that in general, the mosquitoes fared better at cooler temperatures.

But they also found that the West Nile virus-carrying mosquitoes from Gainesville fared worse than their counterparts at the hotter temperatures, and to their surprise, that the Vero Beach-bred mosquitoes carrying West Nile virus lived longer than all other groups at the cooler temperature, including control-group mosquitoes not exposed to the virus.

Ingesting virus-infected blood may take a toll on the mosquito's health, Alto said, but it's clear that other factors: immune response, genetics and the environment, are also at play and need more study.

"It's quite complex, there's a lot of stuff going on here," Alto said. "But I think the take-home message is that these viruses, when they're in mosquitoes, not only can they alter parameters like survivorship that are really important to disease transmission, but they can alter them in non-intuitive ways -- sometimes enhancing, sometimes decreasing survivorship, and that those situations arise when you start considering other factors of the environment, like temperature."

Adding to scientists' knowledge base of how disease affects insects is key to finding the best ways to limit its spread, Alto said.

"In the most general sense, in order for humans to control disease, we really need to know how the mosquito interacts with these viruses," he said. "In the absence of a human vaccine, the best way to control any sort of mosquito-borne virus is to control the mosquito. Simply put, if the mosquito doesn't bite you, you're not going to get the pathogen."


Story Source:

The above story is based on materials provided by University of Florida Institute of Food and Agricultural Sciences. The original article was written by Mickie Anderson. Note: Materials may be edited for content and length.


Journal Reference:

  1. Barry W. Alto, Stephanie L. Richards, Sheri L. Anderson, Cynthia C. Lord. Survival of West Nile virus-challenged Southern house mosquitoes,Culex pipiens quinquefasciatus, in relation to environmental temperatures. Journal of Vector Ecology, 2014; 39 (1): 123 DOI: 10.1111/j.1948-7134.2014.12078.x

Cite This Page:

University of Florida Institute of Food and Agricultural Sciences. "Climate, genetics can affect how long virus-carrying mosquitoes live." ScienceDaily. ScienceDaily, 10 July 2014. <www.sciencedaily.com/releases/2014/07/140710183435.htm>.
University of Florida Institute of Food and Agricultural Sciences. (2014, July 10). Climate, genetics can affect how long virus-carrying mosquitoes live. ScienceDaily. Retrieved November 26, 2014 from www.sciencedaily.com/releases/2014/07/140710183435.htm
University of Florida Institute of Food and Agricultural Sciences. "Climate, genetics can affect how long virus-carrying mosquitoes live." ScienceDaily. www.sciencedaily.com/releases/2014/07/140710183435.htm (accessed November 26, 2014).

Share This


More From ScienceDaily



More Plants & Animals News

Wednesday, November 26, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Classic Hollywood Memorabilia Goes Under the Hammer

Classic Hollywood Memorabilia Goes Under the Hammer

Reuters - Entertainment Video Online (Nov. 26, 2014) The iconic piano from "Casablanca" and the Cowardly Lion suit from "The Wizard of Oz" fetch millions at auction. Sara Hemrajani reports. Video provided by Reuters
Powered by NewsLook.com
Pet Dogs to Be Used in Anti-Ageing Trial

Pet Dogs to Be Used in Anti-Ageing Trial

Reuters - Innovations Video Online (Nov. 26, 2014) Researchers in the United States are preparing to discover whether a drug commonly used in human organ transplants can extend the lifespan and health quality of pet dogs. Video provided by Reuters
Powered by NewsLook.com
From Popcorn To Vending Snacks: FDA Ups Calorie Count Rules

From Popcorn To Vending Snacks: FDA Ups Calorie Count Rules

Newsy (Nov. 25, 2014) The US FDA is announcing new calorie rules on Tuesday that will require everywhere from theaters to vending machines to include calorie counts. Video provided by Newsy
Powered by NewsLook.com
Feast Your Eyes: Lamb Chop Sent Into Space from UK

Feast Your Eyes: Lamb Chop Sent Into Space from UK

Reuters - Light News Video Online (Nov. 25, 2014) Take a stab at this -- stunt video shows a lamb chop's journey from an east London restaurant over 30 kilometers into space. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins