Can the UK's Common Toads Survive from Traffic and Population Collapse?
It is a Friday evening at 7:30, but rather than heading to the pub or relaxing at home, I've caught a train to a market town in Wiltshire to meet up with local helpers from a amphibian rescue group. These dedicated individuals give up their nights to safeguard the native amphibian community.
A Worrying Decline in Population
The Bufo bufo is growing more rare. A latest study led by an wildlife conservation group showed that the British common toad numbers have dropped by half since the mid-1980s. Observing a species that has been a fixture of the British countryside in decline is described as "worrying" by researchers. Toads "don't need very particular environments" and "ought to live quite well in the majority of areas in the UK," so if even they are struggling to persist, "it indicates that things are not as they should be."
Toad populations across the UK have declined by almost 50% since the 1980s
The Threat from Roads
Though the research didn't examine the causes for the drop, cars is a major factor. Calculations suggest that 20 tons of toads are crushed on British roads annually – that is, hundreds of thousands. In contrast to frogs, which might be happy to mate "with just a small container," toads prefer big bodies of water. Their ability to remain away from water for more time than frogs means they can travel further to find them – often long distances. They tend to stick to their ancestral migration routes – it's common for mature amphibians to return to their natal pond to mate.
Migration Habits
Appropriately enough, the first toads start their journey for a mate around February 14th, but others travel as far as April, until it gets night and travelling through the night. During that time, toads begin migrating from where they have been overwintering "all pretty much at the same time."
One volunteer, who was raised in the region and has been working to save its toad population since he was a boy, explains that "They've got just one focus: to go and mate." If their route happens to a street, they could be killed by traffic, and that mating period would never happen – stopping a next generation of toads from being born.
Rescue Groups Across the United Kingdom
Finding hundreds of toad carcasses on nearby streets "resonates deeply with people," and has led to the creation of rescue teams throughout the UK – 274 groups are currently registered with a countrywide program. These groups pick up toads and transport them across roads in containers, as well as counting the number of toads they encounter and lobbying for other safety solutions, such as blocked roads and amphibian passages.
Patrols usually work during the migration season, when toad crossings are more regular. However, this implies they can miss numbers of toadlets, which, having existed as eggs and then juveniles, leave their ponds over an irregular timetable in late summer. Because of their size – just one or two centimetres wide – "they can get obliterated by vehicles." And as being hit "basically turns them into mush," it's more difficult to collect information on them. At least when adult toads are lost, their carcasses can be tallied.
Annual Efforts
Unlike many groups, a specific volunteer group, who are in their eighth season of operating, go out year-round – not nightly, but when conditions are damp, or if a member has reported about a toad sighting in their group chat. When I ask to join them on patrol, they concede it is "not ideal conditions" – toad hibernation season has started and it's been a arid period – but a few of the helpers gamely agree to patrol their area with me and search for any toads. "Should anyone can locate any toads tonight, those two will find one," says the group coordinator, pointing to her 14-year-old son and the longtime volunteer. We've been out for 120 minutes without a glimpse of any amphibians, and now they have climbed over a wire barrier to check under some wood.
Community Involvement
The family duo became part of the group a while back. The youngster loves all things nature-related and has an goal to become a environmentalist, so his parent started to search for things they could do together to protect native animals. Now she enjoys it as much as he does, the middle-aged entrepreneur explains – so when the group was looking for a fresh coordinator lately, she decided to step up.
The youth, too, has played an important role in the organization. A clip he created, urging the municipal authority to block a road through a protected area during migration season, influenced the outcome the group's way. After a year of lobbying, the council agreed to an "access-only" rule between evening and morning from late winter through to April. The majority of motorists respected and avoided the road.
Additional Species and Difficulties
Several cars go by when I'm out on duty and we discover some victims as a consequence – no amphibians, but three squashed newts. We spot one live amphibian as well, and the teenager is especially excited to see a daddy longlegs, which moves in his palms. Yet despite the group's hardest attempts to show me a toad, the local population has obviously settled down for the winter. It appears that I wouldn't have had any more luck elsewhere in the country – all the rescue teams I contact explain that it's very difficult at this time of year.
This team anticipates assisting around ten thousand mature toads over the street
One email I get from another volunteer, who has generously made the effort to check for toads in a noted location, thought to be the largest accurately monitored toad population in the UK, arrives in my inbox with the subject line: "No toads." However, in late winter, he informs me, the group expects to help approximately ten thousand adult toads across the road.
Impact and Limitations
What level of impact can these organizations actually make? "The reality that volunteers are doing this regularly on cold, damp and unpleasant evenings is quite extraordinary," notes an researcher. "That's something that very much should be celebrated." However, while toad patrols are able to reduce the drop, they can't stop it completely – not least because traffic is just one danger.
Other Dangers
The climate crisis has resulted in extended spells of drought, which cause the poor environment for some of the creatures that toads eat, such as worms and slugs, while higher water temperatures have caused an increase of toxic plants, which can be harmful to toads. Warmer cold seasons also cause toads to emerge from their hibernation more frequently, disrupting the resource preservation crucial to their existence. Loss of environment – particularly the loss of big water bodies – is another menace.
Experts are "often concerned about overemphasizing practical benefits on biodiversity," however "There is a big value in just having these animals around." But toads do have an important role in the ecosystem, consuming pretty much any invertebrates or tiny organisms they can swallow and in turn feeding a number of birds and mammals, such as hedgehogs and otters. Enhancing conditions for toads – such as creating more ponds, conserving woodland and constructing amphibian passages – "we'll improve them for a wide range of additional wildlife."
Cultural Importance
An additional motive to try to keep toads present is their "important cultural value," adds an expert. Myths and folklore around toads date back {centuries|hundred