The diet of bees has changed over the years.   In the past, bees were able to forage and collect pollen and nectar from a variety of plants.  With the spread of highly mechanised agriculture, increasing urbanisation and road network - now their options are somewhat limited.  Large fields of monocultures, for example, of oil seed rape are now common. Whilst oil seed rape is a good source for foraging bees and bumblebees, they need to collect nectar and pollen from a variety of sources so that they get a range of nutrients, such as the essential amino acids.  Without these particular amino acids, the growth and development of bees is affected, as is their resistance to disease and their ability to raise the brood.  It is important that our pollinators are able to find a range of plants / pollen to provide all their nutrients. Whilst wild flowers [aka weeds], like dandelions, ragworts, and clovers are a lifeline for bees and bumblebees, recent research at the University of East Anglia has shown that woodlands can offer important habitats for bees, isuch as the leaf canopy.  The research team studied 15 woodland sites in agricultural areas across Norfolk (in Spring).  Within the woodlands, they looked at the bee activity in  the understorey  the woodland edge  and at different levels in the tree canopy.   They found that bees were active high up in the sunlit tree canopy, and their activity was particularly high near flowering sycamore trees.  Red tailed bumblebees (Bombus lapidarius) were busier in the canopies than elsewhere.  The understorey and woodland edges were also significant contributors to bee activity.  This study emphasises the importance of woodland habitats for the wild bee community.  

Bumblebees (and bees) collect nectar and pollen.  Pollen is a vital food, used in the various stages of a bumblebee’s life. In Spring, newly emerged queens feed on pollen, then it is used to feed its their sister workers. The workers, in turn, take over the feeding of the colony (the larvae and future queens). If not enough pollen is collected, then the colony will not thrive, which can have significant long term effects.  Bumblebees are already facing many threats (from habitat fragmentation, agrochemicals and disease). The collection of pollen is a demanding process, and bumblebees will forage over a wide area.  They start their pollen collecting activities earlier than many insects as they can warm themselves up by ‘shivering’, that is, rapid muscle contractions which generate heat, warming the insects up ready for flight.  Bumblebees can fly in colder conditions and at higher elevations than many other insects. However, research at North Carolina State University has shown that the North American bumblebee (Bombus impatiens) can overheat when exposed to high temperatures (circa 42oC plus).  So,  if a bee is carrying a significant load of pollen and it is a hot day, its muscles have to work harder and the bee is at risk of overheating. A bumblebee loaded with pollen may be 2oC hotter than an unladen bee; it may be reaching its ‘thermal limit’ - a temperature at which its organs are damaged.  Climate change means that many parts of the world are now experiencing extreme weather events, when temperatures can reach into the forties. [caption id="attachment_39978" align="aligncenter" width="675"] Bumblee leaving foxglove[/caption] Increasing temperatures could affect the foraging activities of bumblebees in a significant way - affecting how much pollen is collected and how much pollination takes place.  If pollen collection is reduced then colony development is affected and so population numbers will be affected.  Bumblebees are key pollinators in natural and agricultural systems, and if their numbers decline there will be ecological and agricultural consequences.  

What a fabulous day spent with Chloe, a professional forager, educator, wild food consultant and chef, along with her truffle hunting spaniel, Samphire.  We enjoyed a fully immersive foraging experience near the banks of the River Severn in Chepstow, Monmouthshire. Wales, she explained is bountiful at any given time of the year,  you just have to know when, where and how to find it!   We weren’t disappointed, encountering an incredible array of edible flora and fauna amongst meadows, hedgerows, salt marsh coastal flats and ancient woodland, locating over 30 herbs, roots, flowers, vegetables, field mushrooms, nuts, seeds and estuary herbs. Chloe’s enthusiasm and passion shone through as she  described how to identify, sustainably harvest and utilise all of the incredibly nutritionally superior and flavour-packed wild ingredients. Who knew such a treasure trove of nature’s bounty lay tantalisingly within our reach.   A foraged feast in the wild was a perfect end to the session, enjoying a myriad of pre-prepared dishes and accompanied by the freshly picked produce of the day. Her incredible menu included Creamy oyster & field mushroom soup with miso and brandy, Orange birch bolete mushroom puff pastries, Mugwort focaccia, Venison, cider and wholegrain mustard broth, Elfcup mushrooms stuffed with 3-cornered garlic and wild walnut pesto with fresh garlic leaves, Jack by the hedge and cleaver hummus with Primrose blooms, Fennel and chickpea salad, Roast brace of pheasant stuffed with Scott’s Pine with allspice, cranberry and honey, Roast Muntjac venison shoulder with garlic, thyme and juniper, served with rose and red clover jelly, and bacon cured chicken of the woods mushroom nuggets with wild plum barbecue sauce. Chloe had a treasure trove of knowledge too as she detailed the folklore, medicinal and nutritional benefits. Of particular interest were the use of  medicinal mushrooms which are thought to strengthen the immune system   : Reishi, Lion’s Mane, Chaga, Cordyceps, and particularly Turkey Tail, where a preparation known as Krestin has been used as a supportive therapy against Cancer in Japan for decades. She explained the origins of the word ‘wort’.  most likely derived from the Anglo Saxon word for wound or hurt, implying curative properties such as Navelwort, St John’s Wort and Mugwort, but occasionally implying a strong physiological effect of a negative nature such as poisonous Ragwort too.  Folklore is related to the Yarrow plant, Achillea millefolium, the latter meaning thousands of leaves due to its fluffy, feather like appearance.  Achillea is related to the legend of Achilles who always carried Yarrow on the battlefield to stem bleeding - it’s a wonderful styptic.  To protect him before the Trojan war his family collected Yarrow, considered to be a cure all miracle herb and immersed it in water. They dipped his entire body but held him by one foot which didn’t get drenched in the magic water, hence the expression “Achilles' heel” The muddy banks of the Seven Estuary harboured some hidden gems.  Scurvy grass or spoonworm, a species of flowering plant in the family Brassicaceae were taken aboard ships in dried bundles to combat scurvy. Wild spinach, Plantains, Radishes and Cabbages line the estuary coast.  Wales has a seaweed tasting like truffles with a hint of garlic called Pepper Dulse.  Woodruff is a beautiful woodland plant growing in whorls, which when dried tastes like Amaretto. The enchanting Elfcup - a dainty red mushroom adoring the forest floor appears to emit a puff of ‘fairy dust’ when picked.  Nature, as always, a treasure trove of beauty and magic.  The cautionary mantras “Never munch on a hunch” and ‘If in doubt, leave it out” are wise words indeed. The poisonous Ragwort with its yellow flattened flower heads appears similar to Wild Cabbage, and the Hemlock Water Dropwort can be deadly, all parts of the plant are highly toxic and ingestion can be fatal. A member of the carrot family it has many edible lookalikes such as celery and parsley which can be confusing and dangerous for a novice.  It grows in damp areas - wet grassland and woodland, river and stream banks, canals and in the vicinity of ponds and lakes Foraging is fun! But there are a few rules to observe. Please contact the landowner for permission to forage on private land, and do not forage on public land for commercial gain.  Avoid areas which could have been sprayed with chemicals such as land bordering farmland. It is illegal to dig up a wild plant by the root or bulb unless you are the landowner or have the landowner’s permission. Always forage sustainably and with care, observe how prolific the plant is and never take too much.  For more information,  please contact Chloe Newcomb Hodgetts : Foraging Course and Guided Walks Purveyor at Gourmet Gatherings: www.gourmetgatherings.co.uk .

Honey bees are often infected by the mite - Varroa.  Mites are small arachnids.  The varroa mite is an external  parasite, attaching to the body of the bee and feeding from it.  It also infects honey bees with various viruses, which further harm the bees.  One such virus is the deformed wing virus.  Bees that are severely infected with this virus die within days, some have such poorly developed wings that they cannot properly forage for nectar and pollen.  The virus also affects their ability to learn, so that if they forage they may not be able to find their way ‘home’.  Lost bees die, the colony is deprived of food collected by such bees and the colony may collapse. Eliminating the mite is difficult and the use of chemicals risks contaminating any honey collected from treated colonies / hives.  However, researchers at the National Taiwan University have found a naturally occurring compound that may help alleviate the effects of the virus.  The compound in question is sodium butyrate Na(C3H7COO).  In a series of experiments, the research team found that bees that were fed sugar-water laced with butyrate were better able to resist the effects of subsequent viral infection.  Compared to a control group that did not have butyrate, some 90% were still alive five days after infection whereas 90% of the control group died.  The butyrate treatment also improved the bees’ ability to forage and return to the hive.   Further details of this work here. Sodium butyrate is an inexpensive chemical, and if its benefits are substantiated then it could provide an affordable solution to the mite and virus problem that honey bees face.

Silwood Park is part of Imperial College, a postgraduate campus, located some 25 miles west of central London, near Ascot. It is a centre for research and teaching in ecology and allied disciplines. The campus includes areas of wet woodlands, acid grasslands, traditional orchards and parkland. The veteran and ancient trees support an significant number of rare species of insects, lichens and fungi that depend on decaying wood. Silwood is the heart of the wildlife corridors for the surrounding area.  Read more...

Many of us taking our daily walks are noticing the very strong signs of Spring with new growth everywhere.  Two classic woodland and hedgerow ingredients are at their best for picking in early Spring, nettles and wild garlic, both are packed with goodness and combined, they make a very tasty and healthy lunch.   It can be incredibly satisfying to forage and make something delicious, with no need for a shopping trip. Add a few extra vegetables, whatever you have available at home. Stinging nettle (Urtica dioica) has been a staple in herbal medicine since ancient times. Most concentrated in the growing tips, the plant contains a high content of nutrients including vitamin A, vitamin C (ten times more than an apple), and vitamin K along with easily absorbed calcium and iron. Read more...

Using DNA technology and samples of honey from many different hives, scientists have been able to analyse the foraging behaviour of honey bees, and compare their findings with a study undertaken in the mid twentieth century. In the earlier study, honey samples were analysed by looking at the pollen grains present.  The shape and sculpting on a pollen grain is unique for each species.   Back in the 1950s, honeybees gathered a lot of pollen and nectar from wild flowers, particularly plants like white clover (Trifolium repens).  As with so many wild flowers, there is far less white clover to be found in hedgerows, meadows and roadsides nowadays, so honeybees have to find alternatives - though white clover is a favourite if it can be found. Read more...

The loss of pollinators, particularly honey bees, may bring about a synergy between pollinators such as hover flies and artificial intelligence technology.  Honey bees (and indeed bumblebee)s have been hit hard by habitat loss, pollution, the  extensive use of pesticides and the spread of viruses and varroa.  Bees provide an important ecosystem service, namely pollination.   bees provide the majority of plant pollination world-wide but the bees are fighting a losing battle and this represents a threat to food supplies.  In the United States, bee hives are 'bussed around' in a somewhat 'cavalier manner', indeed "Hives may be moved multiple times and several thousand miles per year" Read more...