The BES Policy Officer yesterday attended the first day of a meeting in London of the British Ecological Society’s Invasive Species Special Interest Group. The topic for the meeting was “Linking Research and Practice”, with participants eager to find out how their work could better inform policy-making.

David Roy, Biological Records Centre, delivered the morning’s keynote presentation, focusing on the DAISIE (Delivering Alien Invasive Species Inventories for Europe) project. The project had revealed that over 11,000 species are ‘alien’ somewhere in Europe; many of these (60%) terrestrial plants. On average, one alien mammal introduction occurs in Europe each year, and data indicate that the rates of arrival of alien species in European countries are accelerating; a pattern seen for both invertebrates and vertebrates. Although there is no strategy for tackling invasive species at an EU level, a high level communique in 2008 paved the way for the introduction of a strategy in the future.

Olaf Booy, GB Non-Native Species Secretariat, discussed the GB Non-Native Species Framework Strategy, which sets out how invasive species should be tackled in Great Britain. In many respects, Olaf reported, GB is far ahead of other European countries in tackling invasive species, which can have large economic impacts and impacts on human health. The three pronged approach: prevention; detection and rapid response; limit and control populations, must also be accompanied by awareness raising amongst the public in order for the strategy to be effective. Olaf highlighted the research gaps in relation to many species, particularly regarding three key questions: can it establish?; what are the impacts?; what effect will climate change have? He called on the research community to work with policy-makers to provide the answers.

The afternoon saw the BES Policy Officer deliver a brief presentation, introducing the work of the policy team to delegates, and a workshop to consider how policy-makers and practitioners could gain better access to research information. Participants highlighted networking as very important in building trust and collaborations. Policy-makers rarely read academic journals, instead accessing professional networks for copies of papers and information. Policy-makers present at the meeting suggested that digests of current scientific evidence in relation to particular issues, with respect to invasive species, would be extremely helpful. This is something the BES could consider providing in the future.

A team of scientists has warned that there will only be “one winner, 1000 losers” as the Harlequin ladybird continues its spread through the UK. Introduced to Holland to control aphid numbers there, the ladybird spread to the UK in 2004, carried on the wind across the English Channel or transported on fruit and flowers. Since its arrival it has spread around the UK: it has been found as far north as Orkney but is most prevalent in London and South East England.

Helen Roy, a member of the BES and a researcher at the Centre for Ecology and Hydrology, and a team of others are exhibiting on the dangers of the Harlequin at this week’s Royal Society Summer Science Exhibition. Dr Roy says of the Harlequin: ” “It’s a big and voracious predator, it will eat lots of different insects, soft fruit and all kinds of things.” Because of its varied diet, and because it does not need a cold winter to reach sexual maturity, the Harlequin has an advantage over other ladybirds. The scientists fear that the Harlequin will push out rivals through competition for food.

Various means are being considered to tackle this invasive species, including encouraging the transmission of a sexually transmitted mite, making some harlequins infertile.

Read more in today’s Guardian

Invasive non-native species have significant negative ecological and economic impacts. The negative ecological impacts have been widely reported; invasive non-native species may predate or out-compete native species, be the vectors of disease and affect ecosystem services.

In the Journal of Ecology, a team of researchers from the Czech Republic, have published one of the rare studies that actually quantify community-level effects of invasive non-native plants.

The researchers assessed the effects of thirteen invasive non-native plant species on a range of plant communities by measuring species richness, diversity and evenness in invaded and uninvaded plots. Eleven of the thirteen invading plant species reduced species richness, diversity and evenness. The decrease in species richness in invaded plots is primarily due to the identity of the invading plant species. The decrease in diversity and evenness is primarily due to the height and cover of the invading non-native species and the differences in height and cover between the native and non-native plants.

This study indicates the need for conservation managers to consider that the effects of invasive plants on native plant communities differs between invading plant species and that the characteristics rather than species identity of the invading plant affects species diversity and evenness.

Original article: Hejda, M., Pyšek, P. and Jarošík, V. (2009) Impact of invasive plants on the species richness, diversity and composition of invaded communities. Journal of Ecology, 97, 393-403.
For further information on invasive non-native species please see POSTnote 303 written by the 2008 BES-POST fellow.

Today marks the 200th anniversary of the birth of Charles Darwin, naturalist and the ‘father’ of modern evolutionary theory. 2009 also sees the 15oth anniversary of the publication of ‘On the Origin of Species’, Darwin’s seminal work, setting out his exploration of evolution by the process of natural selection.

Celebrating Darwin’s achievements, his detailed observations of animals and plants through his voyage on the Beagle and the crystallisation of the theory of evolution on his return to England, should give us pause to consider the situation which the organisms which he so carefully examined, collected and recorded, now find themselves. Conservationists have warned, reported the BBC this morning, that the Galapagos face irreparable damage if tourism to the islands is not curbed. The number of visitors to the Galapagos has quadrupled over the past 20 years, threatening established organisms through the transport of invasive alien species, including the pervasive fire ant, which threatens birds and tortoises, and a species of parasitic fly.

Speaking to the BBC, the director of the Galapagos National Park, Edgar Munoz, acknowledges the challenge but says the Ecuadorian government’s actions will tackle the problem. He is hopeful that the threat can be reduced within the next ‘50 years’. Conservationists have expressed concern however that tackling these insects will not be easy.

Along with many others organising festivals and events around the country to mark these important anniversaries, the BES is celebrating Darwin’s life and work by staging two productions of ‘Re:Design’, a play commissioned by the Darwin Correspondence Project, written by the playwright Craig Baxter, and performed by the Menagerie theatre company in Cambridge. You will be able to see ‘Re:Design’ either at our Annual Meeting (9 September) or at the British Science Festival (5 September – tbc).

A nationally co-ordinated programme has been launched in an attempt to save Scotland’s red squirrel. The £1.3m project will develop habitats in which the red squirrel can thrive, but will also attempt to control the grey population by trapping and killing them.

To achieve this, a “red squirrel protection line” has been drawn across Scotland, stretching south-east from Montrose on the North Sea to Inveraray on the west coast. All grey squirrels caught north of this line will be culled. It is expected that many tens and thousands of greys will be killed, making this the largest mammal cull in the UK.

The number of British red squirrels has been declining since grey squirrels arrived from North America in the 19th Century. The larger and stronger greys easily out-compete reds for food and habitat and also carry squirrelpox; a virus which is harmless to greys but generally lethal in reds.

It is estimated that a mere 160,000 red squirrels are left in Britain – 75% of which live in Scotland – compared to approximately 3.3m greys.

Stuart Brooks, the SWT conservation director, told the guardian that unless concerted action is taken, reds could be extinct on mainland Britain within 30 years.

The project has received criticism from animal campaign organisations such as Advocates for Animals, who feel that the protection of the red squirrel should not come at the greys’ expense, and should be achieved through effective habitat management and the development of a squirrelpox vaccine. However, this could take decades to take effect, by which time, many fear, there may be no red squirrels left to protect.

A new study, published online in the British Ecological Society journal, Functional Ecology, uses an innovative model to predict the spread of human disease vectors in a changing climate. Warren Porter, at the University of Wisconsin-Madison, has developed a unique model, ‘NicheMapper‘, which allows researchers to answer the question: “Where would a species with a particular set of properties best survive and function on the planet?” Uniquely, the model also allows an organisms potential for evolutionary change to be incorporated, allowing the researchers to examine a range of scenarios.

The study focused on the dengue fever vector, the mosquito Aedes aegypti, and on its distribution and abundance in Australia. At present, the mosquito is confined to areas around Queensland, however, by modelling the insect’s life history traits, capacity to evolve and climate change scenarios, the researchers conclude that a warming climate will allow the mosquito to expand its range into several populated areas of the continent, over the next 40-years. These conclusions are also likely to apply to populations of the mosquito found elsewhere in the world.

The researchers found that onefactor limiting the ability of the mosquito to spread would be the availability of standing water in which to lay its eggs. Simple measures, such as covering pools and water tanks, could have a large effect in reducing the spread of the insect. However, NicheMapper also allowed the researchers to model the effects on the species’ distribution if the mosquito evolved to develop eggs tolerant of dessication; observed in other closely related species. In this case, combined with climate change, the mosquito could spread far, and rapidly.

Warren Porter claims that NicheMapper can be used to model the spread of almost any species on the planet; for example mapping the likely pattern of spread of invasive species. He has developed a company, ‘Animaps‘ to make the software available to the scientific and policy communities.

A London railway operator, Tube Lines Group, has announced plans to eradicate the invasive Japanese Knotweed (Fallopia japonica) from more than 120 sites across London, using the new chemical herbicide ‘Tordon’. If successful, Tube Line will become the first train company in Europe to eradicate the species.

Japanese Knotweed is an invasive, non-native species that was originally introduced to the UK in the mid-19th century. It is notorious for its ability to grow vigorously from tiny pieces of stem or rhizome and can break through drains, brick wall and tarmac as it spreads. Once established, it easily out-competes the vast majority of British flora and can quickly transform the ecosystem it inhabits.

In addition to altering the native flora and fauna, the knotweed can have a detrimental effect on the economy by decreasing the area of land available for agriculture and infrastructure and making certain areas more susceptible to flooding.

Japanese knotweed is difficult and expensive to control using current techniques and an estimated £1.56 billion would be required to eradicate it from the UK entirely. Until now, eradiation programmes have mainly involved digging out the plant or treating it with herbicides, three times a year, over a period of seven years. However, Tube Lines plans to eradicate the knotweed by spraying the herbicide just once a year for two years.

Picloram, the active agent in Tordon, is harmful to plant species other than the knotweed. The US Environment Protection Agency states it is ‘slightly toxic’ to aquatic wildlife, although, the Environmental Protection Agency states it is “practically non-toxic to birds, mammals and honeybees”.

If this regime proves to be successful, with minimal impact on non-target species, it may be extended to the remaining London underground services and the national railways.

Original article: Guardian, 6 January 2009; New herbicide offers hope in battle against Japanese Knotweed

Two non-native invasive species; the chinese mitten crab and the non-native crayfishs‘ ranges are set to overlap in the near future.

Both crustaceans are formidable predators, with a tendency to damage the ecology of their local environment. The signal crayfish Pacifastacus leniusculus, has so far caused the most widespread damage, in part because it is a vector for the plague disease that affects our native white-clawed crayfish Austropotamobius pallipes.

Speaking to the BBC, ecologist Stephanie Peay said: “Where the non-natives move in, the white-clawed crayfish [sic] are lost. Survey work has shown that it only takes between four and seven years from first arrival to achieve a complete local extinction. The only future for the white claws is in isolated water bodies that are completely free from non-native crayfish.”

Both the mitten crab and the crayfish have a broad, generalist diet, the mitten crab being particularly unfussy when it comes to prey items, (plants, fish eggs and molluscs among these). The ecological niches of both species directly overlap, so it is likely there will be some kind of clash when the two species inevitably meet.

When either species is present in any British waterway, they will cause an overall loss in biological diversity and abundance of native species. One of the known mechanisms leading to invasiveness is enemy release. Because of the practicality of introducing natural enemies to curb these exotic beasts, this approach will remain unlikely. Conventional removal of these species by local authorities is currently probably the best method of dealing with these alien predators.

Defra’s invasive non-native species framework strategy can be downloaded here.

The Environment Agency website lists some of the UK’s worst offending non-native invasives.

A team of scientists based at the Centre for Agricultural and Biosciences International (CABI), after extensive experimental trials, have finally found a solution to the super invasive Japanese Knotweed Fallopia japonica.

Japanese knotweed is one of several invasive non-native species, that are collectively estimated to cost the UK billions of pounds in eradication programmes. It is notorious for growing rapidly from tiny fragments, and has the ability to pierce and break-up concrete and tarmac.

The research team at CABI, have discovered that Aphalara itadori, a type of jumping plant lice, is an effective biological control agent against japanese knotweed. The louse could potentially save millions of pounds in chemicals and other means of removal that is otherwise necessary.

The leader of CABI’s research, Dick Shaw, said: “In the case of Japanese knotweed, doing nothing is not an option, so we are applying a century-old technique to a new target and are very hopeful of an effective and sustainable outcome.”

A. itadori has been through extensive trials, to make sure it has an exclusive preference to knotweed (over our native flora – 70 species having been tested). Only after having undergone a public consultation will the lice be ready for widespread use in the UK.

BES members and blog readers are invited to comment on this article

British Waterways has today released a list of the 12 non-native species most likely to damage the country’s canals, rivers and towpaths, harming native wildlife. The organisation is encouraging people to think about the impact on the environment before releasing these so-called “dirty dozen” into the environment.

British Waterways spends £1million each year controlling non-native invasive species across its infrastructure, monitoring the impact of these species with the help of its ecologists. Chris John, British Waterways’ National Ecologist said: “Whilst not all non-native species are harmful, many pose real problems to our native wildlife, to boaters and to our historic channels, locks and bridges. With no natural predators to control them they can overwhelm wildlife, channels, banks and towpaths…We are therefore asking people to help us by disposing of non-native plants safely and carefully, selecting alternative plants for gardens, ponds and aquariums.”

The twelve species are: Japanese Knotweed, Australian Swamp Stonecrop, Giant Hogweed, Himalayan Balsam, Water Fern, Floating Pennywort, Chinese Mitten Crab, Red-Eared Terrapin, Mink, Zander, American Signal Crayfish and Zebra Mussels.

Access British Waterways’ guidance for the public

Access the Inasive Non-Native Species Framework Strategy for Great Britain

Access POSTnote 303 by 2008 BES POST Fellow, Fay Collier, on Non-Native Invasive Species