From The BBC

Scientists are warning of the risks of wild birds spreading diseases when they gather at feeders in gardens. Experts led by the Zoological Society of London say people should continue to feed birds, especially in winter, but should be aware of the risks.

A newly published review of 25 years’ worth of data has identified emerging threats to garden birds. Finches, doves and pigeons are vulnerable to a parasite infection and form of bird pox is becoming more common, causing warty-like lumps on the bodies of great tits and other birds while other disease threats, such as salmonella, appear to be declining. If birds look sick, food should be withdrawn temporarily, the authors say.

“Our study shows how three of the most common diseases that affect British garden birds have changed both dramatically and unpredictably over the past decade, both in terms of the species they affect and their patterns of occurrence,” said Dr Becki Lawson from ZSL’s Institute of Zoology.

Common signs that a wild bird is ill include unusually fluffed-up plumage and lethargy. Diseases can be spread through droppings or regurgitated food around bird feeders.

Finding out more about the changing pattern of diseases will help to ensure that garden birds can be fed safely, say the researchers. ZSL, working with experts from the British Trust for Ornithology (BTO), say people who notice sick birds should:

• take practical steps to minimise risks
• report your observations to the Garden Wildlife Health Project
• seek advice from a vet
• withdraw food for a while to let birds disperse over a wider area
• Feed birds in moderation, clean bird feeders regularly, and rotate feeding sites.

Co-researcher Kate Risely from the BTO (BTO News) said anyone who feeds wild birds should be aware of their responsibilities for preventing disease.

She told BBC News: “Be very vigilant – enjoy feeding the birds but educate yourself about what the risks are and what to do if you see signs of disease.”

It was important to continue to feed wild birds, especially in winter, when they need lots of food to survive, she said.

The review found that patterns of infection in wild birds are changing. This may be influenced by wild birds congregating at bird feeders and coming into contact with species they don’t encounter naturally in the wild.

Download the full review Health hazards to wild birds and risk factors associated with anthropogenic food provisioning here

Meanwhile, in Jersey

Changes to a law to try to reduce problems with seagulls and other wild birds are now in place (see update here). Under the Statutory Nuisances (Jersey) Regulations 2017, it’s against the law to feed wild birds or other creatures in a way that means they become a nuisance or harmful to health. Some birds and rodents carry diseases which can be harmful to human health.

Jersey Society for the Prevention of Cruelty to Animals said (BBC 13 March 1256):

• Don’t scatter food on the ground where it is an easy source of food for rodents
• Bird tables can be accessible to rodents. Don’t overstock them or provide large quantities or unsuitable foods
• Use bird feeders with a catch tray to reduce debris falling on the ground
• Site your feeders with care. Suspending them from a metal wire is the only way to be certain rodents won’t get into them
• Ideally, place a small amount of food in feeders daily to ensure they are emptied daily
• Don’t use your garden as a dump for unwanted food waste, the birds may not want it but rats and mice probably will
• Seagulls are protected under the Jersey wildlife law and can only be moved by licensed pest controllers.

The Department said it had taken the action as some birds and rodents carry diseases that can be “very harmful to human health” and gulls were beginning to build their nests and are attracted to places with easily available food.

Anyone found to be feeding (the gulls) illegally would be served with an abatement notice to either stop or restrict their activity. If ignored it would be an offence and the person responsible could be prosecuted.

From Rare Bird Alert

On their autumn migration south in the Northern Hemisphere, many birds are being lured by artificial light pollution into urban areas that may be an ecological trap, according to new research using weather surveillance radars from the northeastern United States over a seven-year period to map the distributions of migratory birds during their autumn stopovers.

Since most of the birds that migrate in the US are nocturnal and leave their stopover sites at night, the research group took snapshots of the birds as they departed.

“Shortly after sunset, at around civil twilight, they all take off in these well-synchronized flights that show up as a sudden bloom of reflectivity on the radar,” University of Delaware’s Jeff Buler said. “We take a snapshot of that, which allows us to map out where they were on the ground and at what densities. It basically gives us a picture of their distributions on the ground.”

The researchers were interested in seeing what factors shape the birds’ distributions and why they occur in certain areas.

“We think artificial light might be a mechanism of attraction because we know at a very small scale, birds are attracted to light,” Buler said. “Much like insects are drawn to a streetlight at night, birds are also drawn to places like lighthouses. Especially when visibility is poor, you can get these big fall-outs at lighthouses and sports complexes. Stadiums will have birds land in the stadium if it’s foggy at night and the lights are on.”

One hazard for birds attracted to city lights is death from flying into high buildings. Buler said that some cities such as Toronto have even gone so far as to institute ‘Lights Out’ programmes, turning off the lights in tall buildings to deter birds from colliding with them.

Sky Glow

The research team analysed the distributions of the birds in proximity to the brightest areas in the northeast such as Boston, New York, Philadelphia, Baltimore and Washington, D.C.

“These are super-bright, large metropolitan areas,” Buler said. “We found an increasing density of birds the closer you get to these cities. The effect goes out about 200 kilometres [about 125 miles]. We estimate that these flying birds can see a city on the horizon up to several hundred kilometres away. Essentially, there is no place in the northeastern United States where they can’t see the sky glow of a city.”

Parks and yards

The researchers also found that suburban areas, such as people’s backyards and city parks, such as Fairmount Park in Philadelphia, harbour some of the highest densities of birds in the northeast.

“Fairmount Park has higher densities of birds than at Cape May, New Jersey, which is where birders typically go to see birds concentrating during migration,” Buler said.

When they do get lured into cities, the birds seek out suitable habitat, which can cause concerns from a conservation standpoint as lots of birds pack into a small area with limited resources and higher mortality risks.

“One of the things we point out in this research is that there might be negative consequences for birds being drawn to urban cities. We know there’s risk of collision with buildings, collision with vehicles, and getting eaten by cats, which are a major predator,” Buler said.

“Domestic cats could be the largest anthropogenic source of mortality for birds. If birds are being drawn into these heavily developed areas, it may be increasing their risk of mortality from anthropogenic sources and it may also be that the resources in those habitats are going to be depleted much faster because of competition with other birds.”

Another concern: light pollution created in these cities has been increasing in recent years with the advent of LED lights, which are much brighter than the incandescent lights they replaced.

“The transition of street lighting from incandescent to LED continues to increase the amount of light pollution,” Buler said. “If you think about it from an evolutionary sense, for all wildlife really, mammals and insects and birds, they’ve only been exposed to this light pollution for less than 200 years. They’re still adapting to the light.”

Access the paper Artificial light at night confounds broad-scale habitat use by migrating birds here

Just published, the latest State of the UK’s Birds Report highlights how our birds are doing. Some of our summer migrants are arriving earlier, the distributions of others are moving north and some are just beginning to colonise. The report is only possible due to the efforts of volunteers who take part in BTO surveys including those throughout the Channel Islands.

Headlines

• Climate change will provide opportunities for some species, while others will be more vulnerable
• Birds in the UK are showing changes in abundance and distribution, predominantly moving northwards, in a way that is consistent with a changing climate
• Migratory birds are arriving earlier and egg-laying dates have advanced such that swallows, for example, are arriving in the UK 15 days earlier, and breeding 11 days earlier, than they did in the 1960s
• A large number of bird species are likely to have opportunities for colonisation and range expansion in the UK under projected climate change. Potential colonists include a number of wetland species such as little bittern and night heron. A considerable list of southerly-distributed species have already shown substantial increases in recent years, including garganey, quail and little egret

• Climate change will increase the pressures on species already in decline. A number of our declining rare breeding birds, including dotterel, whimbrel, common scoter and Slavonian grebe, are likely to be at a higher risk of extinction in the UK, based on projections of how climate will become less suitable for them

• The UK’s kittiwake population has declined by 70% since 1986 because of falling breeding success and adult survival. Climate change has reduced the availability of the sandeels they rely upon in the breeding season. Other species that feed largely on sandeels, such as Arctic skua, Arctic tern and puffin, are at high risk of climate-related decline
• National surveys provided updated population estimates for capercaillie and hen harrier and revealed declines for both species
• In the UK Overseas Territories, there are positive signs of recovery for four endemic land birds on Henderson Island and updates on a successful translocation project for the cahow.

Download the full report State of the UK’s Birds 2017 here