Speaking at the British Ecological Society's Annual Meeting at Imperial College, London, Dr Helen Roy from the Centre for Ecology & Hydrology will explain how this resistance to parasites is aiding the harlequin's spread in the UK and how the results are helping researchers home in on its weak spot.
Dr Roy compared the behaviour and mortality of both the harlequin and native British ladybirds after infection with the fungal disease Beauveria bassiana. She found that native species succumbed very readily to the disease, whereas most of the harlequins survived. Interestingly, however, the number of eggs the infected harlequins produced was dramatically reduced.
According to Dr Roy: “The harlequin ladybird has been a successful invader worldwide. This could partly be down to its ability to escape the effects of resident natural enemies, such as this fungal disease, which have a major impact on native ladybirds.”
“It is fascinating that even though the fungus killed only a few harlequin ladybirds, the exposed females produced far fewer eggs. We often use death as our only measure of the impact of disease on animals but this study shows that it’s important to look for subtle interactions.”
“Unfortunately, this fungus is not a viable control method for the harlequin because native ladybirds are highly susceptible to the disease, so we need to keep looking for other ways to control it. One possibility is semiochemicals – the chemical cues these ladybirds use for communication. Scientists are just beginning to understand how semiochemicals vary between different species of ladybird. With time it might be possible to manipulate semiochemicals as a control method, perhaps by using the chemicals to lure harlequin ladybirds into traps.”
The harlequin ladybird, Harmonia axyridis, arrived in England in 2004 and was first recorded in Scotland and Northern Ireland in December 2007. It is the most invasive ladybird on Earth and is a major threat to British ladybirds because - compared to native species - the harlequin is large, aggressive and has a huge appetite. Harlequins also bite humans and infest vineyards where the defensive chemicals (reflex blood) it produces taint the wine.
In a second paper to the BES Annual Meeting, Dr Roy will be talking about the UK Harlequin Ladybird Survey and the vital part the public has played in spotting the invader. “The public has played a crucial role in tracking this alien ladybird and has enabled us to build up a detailed picture of where this species is and what it is doing. We can use this information to help answer many questions and we hope that we can learn lessons from this survey that will be useful for understanding other wildlife invasions.”
Dr Helen Roy will present her full findings at 13:40 (UK Harlequin Ladybird Survey) and 17:50 (harlequin ladybird control) on Wednesday 3 September 2008 to the British Ecological Society’s Annual Meeting at Imperial College, London.
Becky Allen | alfa
Scientists on the road to discovering impact of urban road dust
18.01.2018 | University of Alberta
Gran Chaco: Biodiversity at High Risk
17.01.2018 | Humboldt-Universität zu Berlin
On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.
We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
19.01.2018 | Materials Sciences
19.01.2018 | Health and Medicine
19.01.2018 | Physics and Astronomy