Garden bird feeders are boosting blue tit numbers – but leaving other species hungry

From The Conversation

We’ve filled feeders with seeds and nuts since many of us were children and loved seeing which birds arrive. And, we’re not alone – around half of all UK households do the same nowadays, spending £250 million on 150,000 tonnes of bird food each year. That’s enough to feed three times the breeding populations of the ten commonest garden species if they ate nothing else all year, with one feeder for every nine birds that use them.

Have you ever wondered how all of that additional food might be affecting wild birds? How much has our generosity changed their natural diet, and what of the bird species we don’t see visiting garden feeders?

If you live in the UK and the Channel Islands, one garden visitor you’re probably used to seeing is the blue tit. Blue tits are small, fast and often feed high in trees on tiny insects. Seeing exactly what they eat is tough. But with new molecular technology, it has been possible to test blue tit faeces from 39 woodlands across Scotland – some close to houses, some on remote mountainsides and some by the sea – and gain a fascinating insight into their average diet.

What was found, came as a surprise. A small moth caterpillar (Argyresthia goedartella) that lives on birch trees was their most common natural prey item, present in a third of the faeces sampled. But among hundreds of species of insect prey, there was also garden bird food – and lots of it.

Peanuts were present in half of all the faeces – the most common food item for Scottish blue tits – and sunflower seeds in a fifth. And the birds weren’t just popping next door to find these garden treats. Some were travelling as much as 1.4km from remote areas to nibble on their favourite garden snacks. Clearly this has become part of their staple diet.

A blue tit bonanza

Eating the food we provide gives blue tits more energy to lay eggs – five days earlier than blue tits that don’t. These earlier breeders are likely to raise more healthy chicks. Eating bird food was also linked to a nearly four-fold increase in the proportion of adults available to breed in a given area. Where there used to be one pair of blue tits nesting, garden bird feeders nearby meant there was now likely to be almost four pairs sharing the same space.

Other woodland species such as great tits, nuthatches and great spotted woodpeckers that enjoy garden bird food are doing very well too. Their UK populations have increased on average over the last 25 years that bird feeding has really taken off.

All this feeding might be giving these species an unfair advantage. These species have natural competitors in the woods that aren’t using bird feeders as much or at all, either because they’re shy or because they’re bullied by more dominant species, or because they don’t like the food people provide. These species include the marsh tit, willow tit, pied flycatcher, wood warbler and lesser spotted woodpecker. What’s happening to them is, sadly, not such good news.

How to help all woodland birds

On average, woodland birds that don’t use garden bird feeders have declined over the past 25 years, some to the point where they have almost disappeared from the UK countryside. Nobody knows exactly why, and while this may be partly due to their habitat fragmenting and the climate warming, garden bird-feeding may have also played a role.

Due to people feeding them, there are now more dominant blue and great tits in the woods than 25 years ago, eating more of the limited natural food and evicting other species from their nests. There are also more great spotted woodpeckers and squirrels, which eat the chicks of some birds. Perhaps an extra 700,000 pairs of very healthy and dominant great tits in woodlands is too much for the UK’s remaining 2,000 pairs of shy and subordinate willow tits.

While results suggest there’s a link between how much woodland birds visit feeders and their population trends, they don’t show a direct cause, so we shouldn’t panic yet. While scientists study this problem, responsible bird lovers can help.

Consider contributing to the garden bird surveys organised by the RSPB, British Trust for Ornithology and Action for Wildlife Jersey/Birds On The Edge to help scientists keep track of where birds are, in what numbers and what they’re doing. If you’re lucky enough to live where rare woodland bird species can still be found, consider providing less bird food to common species and cleaning your feeders regularly.

Meanwhile, there are more natural ways to encourage wild birds into your garden. Planting native shrubs and trees like rowan, hawthorn, silver birch, spindle and guelder rose is one option. They are all beautiful year-round, fairly small and provide excellent habitats for wild birds. Other ideas include mowing lawns less often and digging ponds.

As some rare species nest close to the ground, please keep dogs on leads while walking in woodlands during the spring too. But most importantly, keep enjoying these beautiful birds – in all their miraculous diversity.

Further reading:

Faecal metabarcoding reveals pervasive long-distance impacts of garden bird feeding

A national scale inventory of resource provision for biodiversity within domestic gardens

Wild bird feeding in an urban area: intensity, economics and numbers of individuals supported

 

 

UK is ‘least effective’ G7 country at protecting nature

From BirdGuides

A new report from the RSPB, using data compiled by the Natural History Museum, has been published ahead of the G7 Summit in Cornwall in June and shows the appalling state of nature in the UK.

The UK is listed as the worst nation in the G7 for the volume of wildlife and wild spaces lost due to human activity, resulting in it being ranked twelfth worst of 240 countries and territories.

The new league table is the latest in a growing body of scientific reports that highlights the urgent need for action from the governments of the UK in order to halt and reverse declines in wildlife and protect and restore the environment. Using the Biodiversity Intactness Index (BII), an internationally approved scientific measurement of the impact of human activity on plants, animals and landscapes, scientists are able to judge the damage to nature in different countries.

The UK has a score of just 50%, which means it has retained only half of its plants and animals, compared with 65% for France, 67% for Germany and 89% for Canada

In 2019 the State of Nature Report revealed 41% of UK species were in decline and more than one in 10 were at risk of extinction. When viewed next to the BII assessment it becomes clear that the UK is at a tipping point where, if enough action is not taken, we will have lost more than we have left.

Beccy Speight, chief executive of the RSPB, said: “This report shows the perilous state of nature in the UK and why we must urgently protect what is left and work to restore what we have lost. The nature crisis is not something far away but it is happening all around us. We are seeing both the long-term damage to our natural world as well as the effects of trying to squeeze nature into smaller and smaller spaces to fit in with our plans. The result is that the wildlife of the UK is disappearing from our daily life and we are now at a point where we risk having lost more nature than we have remaining.

“With so much of what is precious to us at stake and at a time when so many of us have felt the benefits of being in nature through the pandemic, we should all be alarmed that while Boris Johnson is saying the right things about restoring nature within a generation this is not translating into action in Westminster. This week the Queen’s Speech outlined Westminster’s commitment to delivering an Environment Bill for England and Northern Ireland, but this doesn’t go far enough, and with newly elected administrations in Scotland and Wales, it is now time for all politicians to act.

“Every 10 years the UK joins the international community in agreeing goals and targets for the next decade, but we failed to achieve 17 out of 20 of these between 2010 and 2020. If we are to avoid another lost decade for nature, and when this could be the last decade we have to turn the tide, it is down to our Prime Minster to set us up for success and show us the binding action plan to revive our world. And by working in concert with decision makers in Westminster, Holyrood, the Senedd and Stormont the UK can set an example of our different governments working together to save nature.”

Through the Prime Minister, the UK has been bringing together world leaders to commit to saving nature. UK-led initiatives like the Leader’s Pledge have highlighted the urgent need to respond to the nature emergency, and the environment is set to feature at the UK hosted G7 meeting in June as an important scene setter for the upcoming UN COPs on biodiversity and climate. Likewise, the UN will launch their decade of ecological restoration in June highlighting the importance of the next decade to get to grips with the global nature crisis and put the natural world on a path to recovery.

The RSPB is calling for the governments of the UK to bring in legislation that will deliver action on the vital ambition to protect and restore our natural world, provide a blueprint for delivering on the UK’s world leading commitments and:

  • Set legally binding targets to halt and reverse wildlife declines by 2030
  • Determine interim targets to measure the UK’s progress towards the overall goal
  • Establish an independent watchdog with the power to hold governments to account.

To put the UK back on track, the RSPB is calling on all politicians to Revive Our World, and is giving everyone a place to voice their concerns, as well as proposing the legislation and priorities the UK and devolved Governments must set. To find out more visit the Revive Our World pages.

Read the report Biodiversity Loss: The UK’s global rank for levels of biodiversity loss

Chough report: April 2021

A female chough incubating her clutch. Photo under license by Liz Corry.

By Liz Corry

Egg-cellent news

We have managed to identify ten nests. All of which appear to have females incubating eggs. Bonus news, one of those nests belongs to a wild-hatched pairing. Up until now, pairings have comprised Jersey Zoo or Paradise Park birds we have released or a 50:50 mix of captive-bred and wild-hatched choughs.

Nest  Sire Dam
1 Captive-bred Captive-bred (H)
2 Captive-bred (H) Captive-bred
3 Captive-bred  Captive-bred (H)
4 Captive-bred  Captive-bred (H)
5 Captive-bred  Captive-bred
6 Wild-hatched Captive-bred (H)
7 Wild-hatched Captive-bred
8 Wild-hatched Captive-bred
9 Wild-hatched Captive-bred
10 Wild-hatched Wild-hatched

(H) = hand-reared

The other point to note is that the Jersey flock now only has twelve males and eighteen females. The two males that are not paired up only hatched out last year. You wouldn’t expect them to be breeding yet. Then again, if you read last month’s report, never make assumptions with choughs…

Bo and Flieur probing for insects at Sorel. Photo by Liz Corry.

The Trinity Trio

Reports started coming in over Easter weekend of three choughs visiting horse stables near Les Vaux valley behind the Zoo. Working closely with the owner we investigated, did some probing, if you pardon the pun, and discovered a few interesting facts.

A pair of choughs had been using the stables in 2020. The building is like a smaller version of one the quarry buildings and surrounded by several properties with horse-grazed fields. The owner had not noticed the choughs in a while so assumed they had gone.

Now a/the pair had returned, this time with nesting material. However, what appears to be happening is that they are removing material (silver birch twigs) from abandoned pigeon nests and flying off somewhere else.

On one occasion there was an almighty ruckus as the pair flew in to be greeted by a third chough. A phone call on Easter Saturday saw me drive round to the stables in the evening and find a solitary chough roosting in the rafters. 

The leg rings identified the bird as Bee the same chough regularly visiting the Zoo. This made sense, answering the question where does she go at night. It didn’t tell us who the other two were. That was until….

Peacock Farm

After Easter we received reports of two choughs visiting Peacock Farm. This belongs to the Jersey Royal Company of the famous Jersey royal potatoes. The farm also happens to be behind the Zoo and about a kilometre from the stables!

A pair of choughs were being seen, almost daily, on the site often with twigs in their bills. A neighbour managed to pinpoint which building they were going to. We met with two of their directors outside this building to introduce ourselves and explain about the chough project. Almost instantly, two choughs flew out from inside and started shouting at us. 

I would like to tell you that we read the leg rings, know exactly who the pair are and can confidently say there is an eleventh nest in Jersey. A royal one no less.

However, observations over the next few weeks left us a bit muddled. We know that the frenzy of twig trafficking slowed down. When the owner of the stables moved house we naturally stopped getting reports. We have not seen Bee over the Zoo as much. Likewise, chough sightings at the farm have dropped off.

Choughs Pinel and Bee at Peacock Farm, Trinity. Photo by Hannah Clarke

We do know that Bee and Pinel were photographed at Peacock Farm on 17th April. Bee frequently visits Sorel for supplemental feed. We have never seen any inclination that she is paired with Pinel. So if Bee and Pinel are a pair, who the heck was the third chough? Why wasn’t Pinel roosting with Bee at the start of April? Is this a new romance, could there be four choughs residing in Trinity?

The choughs appear to be horsing around this month. Photo by Liz Corry.

Who knows! Thank goodness the Plémont pair are straight forward. Oh wait…

Plémont, pesky choughs and puffins

The Plémont pair look to be progressing well. The female is incubating and the male is doing his best to defend the nest. We are managing to make weekly visits supported by several public sightings.

The Plémont male feeding the female as she takes a break from incubating their eggs. Photo by Liz Corry.

The puffins have now returned to Jersey to breed along the Plémont to Grève de Lecq coast. Puffins nest in burrows often in the same habitat choughs use for feeding and nesting. Our Plémont pair often crop up in reports from the seabird monitoring ‘arm’ of Birds On The Edge. Typically,  they are in flight so leg ring colours aren’t seen. That’s fine though right? Two choughs, one nest. All we need to know is when the chicks are due and if there are any disturbance/predation issues.

Wrong! Remember, never assume. Turns out there has been a switch-a-roo when we weren’t looking. In March we reported Beanie baby had lost her male and paired up with Minty, re-building the nest at Plémont. Jump to April and Minty is at Plémont but it’s not Beanie baby on the nest. It’s a younger female. Scandal!

Leg rings helped staff identify Rey as the female now on the Plémont nest. Photo by Liz Corry.

We haven’t seen Beanie baby all month. Was she ousted by the female or fell victim to the Plémont peregrine? We might never know. All I can say is Rey is incubating eggs at Plémont with Minty. Fingers crossed both Rey and Minty are rearing chicks come May.

Catching up with the choughs

We carried out a couple of successful catch-ups this month with the choughs to replace leg rings. All birds caught looked to be in good health and expected body weight. You always have to be extra cautious at this time of year. You want to be as quick as possible so as not to keep the parents from their eggs or chicks. Breeding females should only be caught if absolutely necessary and handled with care if doing so.

Which is my excuse for not taking any photos of the birds getting their new rings. Instead here is Riccardo trying to pretend everything is normal and that he isn’t holding the hatch door wires posed to drop them. See if you can spot the green lizard that clearly had me distracted from the job at hand.

Waiting to ambush the choughs at the aviary whilst being distracted by the basking green lizards. Photo by Liz Corry.

Aviary maintenance

The aluminium sheeting has been fitted to the aviary to deter rat access. Our next steps are ensuring no rats are living inside. Riccardo is monitoring with the aid of camera traps. Once the all clear is given, the aviary can be used to confine choughs if needed for example for veterinary reasons.

April’s weather has left us without rainwater on several occasions and we have ferried containers up there and altered our cleaning regime to accommodate.

Vegetation-wise, everything is growing which means regular strimming and mowing to maintain chough-friendly habitat. 

Sorel sheep set to work grazing a field previously used for winter bird seed crops. Photo by Liz Corry.

Meanwhile, the eco-friendly lawnmowers sharing the field with the aviary have set to work in another National Trust owned field. Don’t be alarmed if you visit and think a bunch of sheep have escaped. There is a hot wire around the perimeter.

Et maintenant, les nouvelles

Cappy is still happily living in Carteret, France. Photo by Catherine Bataille.

Cappy is still in Carteret. Yann has kindly kept us updated. We even had a photo sent in via Durrell’s Facebook site from a sighting on 11th April just north of Carteret. Read the news from France 

 

Islanders encouraged to join No Mow May

From Wild About Jersey
Islanders are being encouraged to consider joining the No Mow May campaign by not using mowers or strimmers for the whole of May.

The campaign run by the British conservation charity, Plantlife, asks you to leave your mower in the shed for No Mow May and let the flowers grow.

Research Ecologist, Nina Cornish, said: “No Mow May fits in well with our Pollinator Project which is a Channel Island initiative designed to prevent pollinating insects such as flies, beetles, butterflies and bumblebees from declining. Our animation highlights why ‘Protecting Our Precious Pollinators’ is so important and what you can to do help.

“This campaign is a fantastic opportunity for Islanders to do their bit for the environment. We see the most nectar and flowers in gardens that are mowed no more than once every four weeks. Every year around this time we see lots of hedgehogs injured or killed due to strimmers, so this campaign will also benefit their welfare.”

Islanders must still comply with Branchage rules by cutting any plant overgrowth that is obstructing public roads or footpaths. Branchage inspection will take place in June.

Senior Operations Manager of Park and Gardens and Cleaning Services, Bruce Labey, said: “Last year we updated the mowing regime to reflect current UK guidelines, so now we only mow a one-metre strip along most of our grass verges which still keeps us on the right side of the Branchage regulations, but allows wildflowers and grasses to develop which has a huge benefit to pollinators and wildlife.

“My team and I are excited to take part in No Mow May for a second year running, so if the grass looks a bit longer than normal, you’ll know why.”