On a global scale, humanity is facing a natural disaster that we have not yet come to terms with: the “insect apocalypse.” Science takes years showing its decline and although without careful thought the first impression may be “how nice to get rid of mosquitoes”, that loss threatens ecosystems essential for human life. In this collapse there is a most critical and weakest link if possible: pollinators. Its disappearance not only affects the flora, but also the food.
Faced with progressive urbanization and the loss of its natural habitats, current architecture in the United Kingdom has begun to integrate microconservation solutions into the buildings themselves: the Bee Bricka brick that, in addition to supporting walls, houses bees. What began as a sustainable design project has become an urban policy phenomenon that is spreading around the world.
bee bricks. As you can see below these lines, a bee brick looks quite similar to a normal brick, but with one particularity: on its front face it has 18 cavities of different diameters. The back is solid, which prevents insects from entering the interior of the building. It is made from precast and largely recycled concrete (75% granite waste from the Cornish kaolin industry and 25% granite aggregate and cementitious material as a binder).
Behind the choice of design and materials used are years of testing and research not only by engineering professionals, but also by biology, such as collect research log from Falmouth University. This Bee brick can be integrated directly into the masonry of a new building, replace an existing brick in a renovation or placed independently in a garden or orchard. As a presentation, the British company Green&Blue came up with the idea and the first brick hit the market in 2014.
This is what a brick for abjeas looks like. green and blue
Why it is important. Because bees are one of the main engines of pollination of terrestrial ecosystems. According to the IPBES Thematic Assessment on Pollinators, Pollination and Food Productionmore than three quarters of the world’s major crops benefit from animal pollination and approximately one third of the global volume of food produced depends on it directly. That same report indicates that 87.5% of the planet’s flowering plants are pollinated by insects or other animals.
And although in the collective imagination we associate this function with honey bees (Apis mellifera), this is actually an exception: they are a social species, domesticated and exploited by humans. In short: they are an overwhelming minority. Most bees do not produce honey, do not have a queen, and do not form colonies. Of course, they are first-class pollinators and some are specialized in specific species. Their decline has no substitute: if they disappear, there will be plants that will be left without a pollinator.
Context. In the UK there are approximately 270 species of bees and 90% of them are solitary, such as collects the British National Bee Unit. And it is not an isolated case: on the European red list of bees of the IUCN are also the majority and on a global scale the Journal of Applied Ecology establishes that more than 75% of the more than 20,000 described species of bees are solitary. In other words, it is not an isolated case of the islands. And the problem of British bees is not exclusive either: they are losing their nesting habitat at stratospheric speed.
Historically, they made their nests in cavities provided by construction, such as dead wood, cracks in the mortar in old buildings, gaps between stones and also in slopes of unpaved earth, in gaps between stones… spaces that with modern construction, so homogeneous and sealed (compared to the previous ones), have disappeared. The large-scale use of pesticides, the disappearance of grasslands or the effects of climate change, which are pushing species adapted to lower temperatures to the margins, do not help either. And that this study from Anglia Ruskin University evidence that solitary ground bees nest in a wider range of habitats than previously believed.
Rooms for bees by law. The southern English coastal city Brighton & Hove was the first to turn the Bee Bricks into a legal requirement for new buildings. From January 2022 all new buildings over five meters high must include both Bee Bricks as nest boxes for swifts. Out there, Cornwall adopted in 2018 an official planning guide that includes bee bricks as a prescriptive biodiversity measure and several construction companies in the south of England they integrate them voluntarily in their projects for more than a decade.
And do they work? Trials in Cornwall between 2019 and 2021 demonstrate modest results: occupancy rates were low, although nesting activity was recorded in bricks of all colors and in both urban and rural environments. The species that used them the most were the red mason bee (Osmia bicornis) and leaf cutters of the genus Megachile.
He Conservation evidence from the University of Cambridge systematizes the available studies on artificial habitats for bees and concludes that nest boxes and cavity systems are used by solitary bees, as long as they are well designed and located. To work, the bricks need to face south, more than a meter off the ground and near flowering plants. Without those conditions, the probability of a bee colonizing them drops dramatically.
Yes, but. In addition to the modest results precisely due to unsuitable designs and arrangements, there are experts such as Dave Goulson, professor of biology at the University of Sussex and one of the most renowned bee researchers in the United Kingdom, warns for The Guardian that the holes in the Bee Bricks are too small and shallow for most solitary bee species and that the initiative risks being greenwashing for the real estate sector: “We are kidding ourselves if we think that having one of these in every house is going to make a real difference to biodiversity. Much more substantial action is needed.”
On the other hand, other ecology professionals they point out that concentrating cavities in a single point encourages coexistence between species and facilitates the spread of mites and pathogens, unlike what happens in nature, where the nests are dispersed and isolated. The current consensus is that Bee Bricks are a valid but insufficient tool on their own: they require maintenance, an adequate plant context, and study over a longer period of time.
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Cover | Green & Blue and Dmitry Grigoriev
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