Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Can We Restore Wetlands And Leave the Mosquitoes Out?

26.05.2004


When it comes to restoring nature, some members of the natural world are shunned for good reason


Sweetwater Wetland, built in 1996 to help treat secondary effluent from the adjacent wastewater treatment plant, is well-managed, says UA entomologist Elizabeth Willott.


American coots, one of the many species that use the wildlife habitat provided by Tucson’s Sweetwater Wetland



Restoring wetlands has a foreseeable and inevitable downside: the creation of mosquito habitat.

Breeding disease-transmitting mosquitoes isn’t just a surprising side effect of creating wetlands, but an inevitable and foreseeable consequence that must be acknowledged when planning wetland restoration projects, said Elizabeth Willott, an assistant professor in the department of entomology at the University of Arizona in Tucson.


Wetlands do have benefits for people, she said, "Wetlands clean water, help in flood control, provide habitat and have aesthetic value." Even so, she said that environmental ethics require taking into consideration that after a wetland is restored or created, people’s exposure to mosquito-borne diseases may increase.

To realize the impact that mosquitoes can have, just consider the mosquito-borne West Nile virus. In just a few years, West Nile virus, first found in the United States in New York, has already spread as far as Washington state and Arizona.

Diseases transmitted by mosquitoes, such as malaria, encephalitis and West Nile virus, can be just one bite away. In the 1800s, when Tucson’s now-dry river beds had water more regularly, malaria was present in the Tucson basin.

Although malaria is not present in the Tucson area now, Arizona’s West Nile virus season has already begun.

"Several obstacles block people from frankly discussing mosquito problems," writes Willott in her paper "Restoring Nature, Without Mosquitoes?" The article will be published in the June issue of Restoration Ecology.

The short-term nature of funding is one problem. Another is the fear that bringing up negative aspects of a wetland restoration project makes it more likely the project will be rejected. However, Willott suggests that a proposal is strengthened by explicitly addressing mosquito control.

Willott will discuss the ethical questions arising from wetland restoration at the first Future Trends in Environmental Philosophy conference, to be held June 1-4 at the Highlands Center in Allanspark, Colo. Her talk, “Restoring Nature, Without Mosquitoes?” and the discussion that follows will be held on Tuesday, June 1, 7 - 9 p.m.

Her work was supported in part by a fellowship from UA’s Institute for the Study of Planet Earth and UA’s Udall Center for Studies in Public Policy.

Ultimately, the location and ecology of a restored wetland will determine whether intervention is necessary -- or even possible -- to control mosquito populations.

The social climate of a region also plays a role. “When we restore wetlands we not only alter nature in a particular spot, we also typically alter social contexts,” she said. “We also want to build healthy, sustainable human communities.” The upsides and downsides of restoring a wetland should be addressed before a project begins. She said that considering all aspects allows better decision-making about what is best for the community as well as the wildlife.

Willott cites the Sweetwater Wetland in Tucson, Ariz., as a good example of a well-managed, human-made wetland. The wetland is monitored regularly for mosquitoes and a range of tactics are used to keep mosquito populations at bay. At Sweetwater, those tactics include managing the vegetation and using biological insecticides to keep mosquitoes populations down.

Historically, mosquito problems were often dealt with by just draining or filling in wetlands. More recently, broad-spectrum chemical pesticides have been used in the United States for mosquito control. Willott says there are better ways to manage mosquito problems.

“What is best depends on both the local ecological and social contexts," Willott said. "We need to know answers to questions such as: What mosquito species are present? What threats do these pose for people? If the threat is significant and mosquitoes need to be controlled, we must also ask: How can mosquitoes be managed effectively in this location and in such a way that there is minimal risk from our management strategy?”

Kara Rogers | University of Arizona
Further information:
http://uanews.org/cgi-bin/WebObjects/UANews.woa/4/wa/SRStoryDetails?ArticleID=9253

More articles from Ecology, The Environment and Conservation:

nachricht Upcycling 'fast fashion' to reduce waste and pollution
03.04.2017 | American Chemical Society

nachricht Litter is present throughout the world’s oceans: 1,220 species affected
27.03.2017 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

7th International Conference on Crystalline Silicon Photovoltaics in Freiburg on April 3-5, 2017

03.04.2017 | Event News

 
Latest News

Bare bones: Making bones transparent

27.04.2017 | Life Sciences

Study offers new theoretical approach to describing non-equilibrium phase transitions

27.04.2017 | Physics and Astronomy

From volcano's slope, NASA instrument looks sky high and to the future

27.04.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>