Navigation Links
Hoarding rainwater could 'dramatically' expand range of dengue-fever mosquito
Date:1/27/2009

Ecologists have developed a new model to predict the impact of climate change on the dengue fever-carrying mosquito Aedes aegypti in Australia information that could help limit its spread.

According to the study, published in the new issue of the British Ecological Society's journal Functional Ecology, climate change and evolutionary change could act together to accelerate and expand the mosquito's range. But human behaviour in the form of storing water to cope with climate change is likely to have an even greater impact.

Lead author, Dr Michael Kearney of the University of Melbourne says: "The potential direct impact of climate on the distribution and abundance of Ae. aegypti is minor when compared to the potential effect of changed water-storage behaviour. In many Australian cities and towns, a major impact of climate change is reduced rainfall, resulting in a dramatic increase in domestic rainwater storage and other forms of water hoarding."

"Water tanks and other water storage vessels such as modified wheelie bins are potential breeding sites for this disease-bearing mosquito. Without due caution with water storage hygiene, this indirect effect of climate change via human adaptation could dramatically re-expand the mosquito's current range," he says.

Ae. aegypti probably arrived in Australia in the 19th century on ships carrying mosquito larvae-infested water barrels. During the late 19th century, Ae. aegypti was widespread in urban Australia, stretching as far south as Sydney and Perth. By the late 1960s, Ae. aegypti was restricted to the northern half of Queensland (where it currently resides) thanks in part to removal of old galvanised tin rainwater tanks, installation of piped water, insecticides and new power lawnmowers that helped people keep their back yards tidy.

The study has major implications for public health interventions in Australia and other areas of the world affected by dengue and other mosquito-spread diseases. According to Dr Scott Ritchie, a mosquito control expert and contributing author: "The better we understand the underlying processes, the better we will be able to manage disease risk into the future. Our results highlight that dengue-vectoring mosquitoes can spread to areas where they are currently not found once suitable breeding sites, such as containers, become available. Our research can help target water hygiene education campaigns to areas most at risk of dengue mosquito establishment."

The predictions come from a new "bottom-up" model that takes into account the mosquito's biology and its physiological limitations, such as the ability of its eggs to tolerate drying out.

To construct the model, Kearney and his colleagues needed to predict the microclimates mosquitoes experience. "Like all mosquitoes, the dengue mosquito has an aquatic larval phase and it is very particular about breeding in artificial containers like water tanks, buckets and old tyres. So we developed a model of the temperature and depth of water in different containers as a function of climate. We modelled two extreme types of container a large (3600 litre) water tank receiving rainwater from a roof catchment, and a small (20 litre) bucket only receiving rainwater from directly above. We considered each container type in high and low shade," Kearney says.

The authors also took evolution into account the first time this has been done in such models. According to Professor Ary Hoffmann, a coauthor of the study: "Evolution happens all the time in nature and can be very rapid, taking only a few generations to influence the fitness of populations. Our results show that evolution can make a very large difference when predicting changes in species ranges under climate change."


'/>"/>

Contact: Becky Allen
beckyallen@ntlworld.com
44-079-498-04317
Wiley-Blackwell
Source:Eurekalert

Related biology news :

1. Newly created cancer stem cells could aid breast cancer research
2. Obesity and lack of exercise could enhance the risk of pancreatic cancer
3. Finding that 1-in-a-billion that could lead to disease
4. 60 second test could help early diagnosis of common brain diseases
5. Auto immune response creates barrier to fertility; could be a step in speciation
6. Paracetamol, one of most used analgesics, could slow down bone growth
7. Drug could improve pregnancy outcomes in wider range of women with insulin resistance
8. Thousands of starving children could be restored to health with peanut butter program
9. Nanotech could make solar energy as easy and cheap as growing grass
10. CO2 emissions could violate EPA ocean-quality standards within decades
11. MIT model could improve some drugs effectiveness
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/15/2017)... ivWatch LLC , a medical device company focused on improving the ... its ISO 13485 Certification, the global standard for medical device quality ... ... device for the early detection of IV infiltrations. ... "This is an important milestone for ivWatch, as it validates ...
(Date:6/14/2017)... , June 15, 2017  IBM (NYSE: IBM ) is ... tech event dedicated to developing collaboration between startups and global ... June 15-17. During the event, nine startups will showcase the ... in various industries. France ... international market, with a 30 percent increase in the number ...
(Date:5/6/2017)... May 5, 2017 RAM Group ... a new breakthrough in biometric authentication based on ... mechanical properties to perform biometric authentication. These new sensors ... material created by Ram Group and its partners. This ... transportation, supply chains and security. Ram Group is ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... October 12, 2017 , ... ... Market with the addition of its newest module, US Hemostats & Sealants. , ... thrombin hemostats, absorbable hemostats, fibrin sealants, synthetic sealants and biologic sealants used in ...
(Date:10/12/2017)... , ... October 12, 2017 ... ... has launched Rosalind™, the first-ever genomics analysis platform specifically designed for life ... Named in honor of pioneering researcher Rosalind Franklin, who made a major ...
(Date:10/11/2017)... ... October 11, 2017 , ... The CRISPR-Cas9 ... enabling overexpression experiments and avoiding the use of exogenous expression plasmids. The simplicity ... for performing systematic gain-of-function studies. , This complement to loss-of-function studies, such ...
(Date:10/11/2017)... ... October 11, 2017 , ... ComplianceOnline’s Medical Device Summit is ... and 8th June 2018 in San Francisco, CA. The Summit brings together current and ... distinguished CEOs, board directors and government officials from around the world to address key ...
Breaking Biology Technology: