Why Did My Bees Leave The Beehive?

Dead bees on the floor by the entrance

Bees have been facing a daunting challenge in recent years – the unexplained phenomenon of beehive desertion, resulting in beekeepers around the world asking the question; why did my bees leave the beehive?

Beekeepers have reported instances where their once-thriving colonies mysteriously disappear, leaving behind empty hives and unanswered questions. In this blog, we'll delve into the intricate world of bees, exploring the potential reasons why they abandon their hives and the broader implications for our environment.

Abandoned bees in their combs

Before we dive into the mystery of beehive desertion, it's essential to understand the intricate lives of bees. A beehive is not just a home; it's a highly organised and tightly knit community where each bee has a specific role to play. The colony comprises worker bees, drones, and a queen, each with unique responsibilities that contribute to the hive's overall functionality.

Worker bees are the backbone of the colony, engaging in tasks such as foraging, nursing the young, and maintaining the hive. Drones are male bees with the sole purpose of mating with a queen during their short lifespan. The queen, on the other hand, is the heart of the hive, laying eggs and maintaining the colony's unity.

CCD covers a wide variety of explanations for abscondment

Beehive desertion, often (in my opinion, unhelpfully) referred to as Colony Collapse Disorder (CCD), is a perplexing phenomenon characterised by the sudden disappearance of worker bees, leaving the queen and a handful of young bees behind. This enigmatic event was first recognised in the mid-2000s, and since then, it has been a significant concern for beekeepers and scientists alike. So let's answer the question, why did my bees leave the beehive?

Why did my bees leave the beehive?

Pesticides and Chemical Exposure: One leading hypothesis suggests that exposure to pesticides and harmful chemicals plays a pivotal role in bee disappearances. Neonicotinoids, a class of systemic pesticides, have been particularly scrutinised for their adverse effects on bees' nervous systems. These chemicals can interfere with foraging patterns, navigation abilities, and even the cognitive functions of worker bees, making it challenging for them to return to the hive.

Although there is currently no hard evidence to back up this hypothesis, the impact of these chemicals is clear and it's good to see some responsible nations are starting to ban these chemicals to prevent the subsequent impact on pollinator species.

When chemical poisoning is the culprit, a true collapse is likely the outcome. Bees are poisoned when out foraging and do not get back anywhere near the hive. Do not confuse this with dead bees underneath the entrance in late summer/winter, which is entirely normal and often where dead bees are dumped by undertaker bees within the hive.

Bees can be poisoned after foraging on plants treated with chemicals

Parasites and Diseases: Bees are vulnerable to various parasites and diseases, such as Varroa mites and Nosema. These threats weaken the overall health of the colony, leading to stress and ultimately contributing to the bees' decision to abandon the hive. The queen may be left behind due to her importance in laying eggs, ensuring the hive's potential survival.

A clear sign if a collapse due to a varroa mite infestation, is the remains of spotty brood with holes in the cappings and dead bees in the cells with their tongues sticking out.

Holes in cappings and tongues out is generally a sign of a varroa infestation

Nutritional Stress: Adequate nutrition is crucial for the well-being of any living organism, and bees are no exception. Changes in the availability and diversity of floral resources can lead to nutritional stress for a colony. Monoculture farming practices, where vast areas are dedicated to a single crop, limit the variety of food sources for bees. Insufficient nutrition weakens the colony and may prompt bees to leave in search of better forage.

This is generally unlikely to happen in the UK due to the variety of nectar and pollen sources that are available but in more remote areas that are reliant on specific flows, it can quite easily cause a colony to collapse if insufficient nutrition is available to the colony.

Bees with their heads down in the cells indicates starvation

Climate Change and Habitat Loss: The impacts of climate change and habitat loss cannot be ignored in the context of bee disappearances. Bees are highly sensitive to changes in temperature, precipitation patterns, and the availability of suitable habitats. Alterations in their environment can disrupt foraging patterns and the synchronisation of colony activities, potentially driving bees to abandon their hives in search of more favourable conditions.

Climate change is resulting in more extreme weather events

Swarming: Swarming is an often overlooked culprit than can effectively answer the question, why did the bees leave my beehive? When a colony loses it's prime swarm, which is the first swarm of the year, it loses roughly 50% of the bees from the colony.

Bees can swarm away to nothing if not managed

However, if the beekeeper doesn't manage this process to reduce the risk of the cast swarms, the colony can quickly lose further swarms until all that is left is a fist full of bees and a virgin queen. When a colony swarms to this extent, it's very unlikely it will ever recover and from the outside, it looks like the colony has collapsed, where in reality, it's just not been managed very well by the beekeeper. If your bees have lost their queen and you need a replacement, you can find our mated queens for sale here - https://www.blackmountainhoney.co.uk/buyqueenbees

If you want to stop your bees from swarming, you can check out our guide here - https://www.blackmountainhoney.co.uk/guides/how-to-stop-bees-swarming

Stress and Overwork: Bees are tireless workers, and their industrious nature is essential for the survival of the colony. However, constant stress and overwork can lead to premature aging and exhaustion among worker bees. When the worker population declines due to these factors, the colony becomes more vulnerable to collapse, and the remaining bees may decide to abandon the hive.

Too much stress is not good for the bees

Hive Location: Another overlooked reason for why a colony of bees will leave a beehive, is the unsuitable location of the beehive. In the UK, bees generally do well in full sun; however, the UK is relatively mild. In warmer climates, if you place a colony in the full midday sun, the bees will abscond the beehive due to excessive temperatures. If the daytime temperatures are excessive, consider placing your beehive in a position that gets shade for the majority of the warmest part of the day and ensure the beehive has adequate ventilation in place.

Try to find the perfect spot for your beehive

Pests: Wasps, hornets or even mice can decimate a colony in as little as a few hours and don't leave much of a trace of their presence unless you have a well trained eye. Tell tale signs of a wasp or hornet attack is the half eaten remnants of bee on the floor. They often only eat half of the bee and leave the other half to decay on the floor. Mice can leave chew marks in the frames and wax flakes on the floor of the hive. Luckily, prevention of collapse due to pests is relatively easy. You just need to keep the hive well stocked with bees at all times. Pests generally become a problem when other factors are effecting the density of the bee population within the beehive.

Asian hornets may change the way we keep bees forever

Conclusion

So, why did my bees leave their beehive? The mysterious departure of bees from their hives is a complex and multi-faceted issue with far-reaching implications. As we unravel the various factors contributing to beehive desertion, it becomes clear that a holistic approach is needed to address this crisis. Efforts to reduce pesticide use, promote sustainable agricultural practices, and create pollinator-friendly habitats are crucial steps toward ensuring the well-being of our vital pollinators. But it's just as important to note that the employment of time served beekeeping management techniques will help limit the chances of the bees leaving their home.

Beehive desertion is not just a problem for beekeepers; it is a wake-up call for society as a whole. The decline of bee populations poses a direct threat to global food security, as a significant portion of our crops depends on bee pollination. By understanding the reasons for why bees leave their beehive, we can work towards implementing solutions that protect these essential pollinators and, in turn, safeguard the delicate balance of our ecosystems. It is time for us to acknowledge the urgency of this issue and collectively take action to preserve the intricate world of bees for future generations.

If your bees do leave your beehive and you would like a replacement colony, our bee nucs for sale are available throughout the season. Find out more here - https://www.blackmountainhoney.co.uk/bee-nucs-for-sale

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