Archive for the ‘Bees’ Category

Bees halt cricket second time for Sri Lanka

February 22, 2017

Published on SundayTimes on 12.02.2017 http://www.sundaytimes.lk/170212/news/honey-bees-are-not-aggressive-says-expert-228184.html

South Africa contested against Sri Lanka in the third one-day international on February 4 dressed in pink to raise awareness of breast cancer, but it was bees that grabbed the attention.

Players duck for cover as bees invade the Wanderers Cricket ground during a match between Sri Lanka and South Africa

Bees invaded the ground forcing players and umpires to lie on the ground before they took cover in the dressing rooms.

A local bee keeper, Pierre Hefer, came to the ground armed with a tub of homemade honey comb to attract the bees. Hefer later told the international media that he initially thought there could be as much as 5,000 bees at the ground, but the actual number was less — 1,000 to 2,000. He drew many of them away.

However, this is not the first time the Sri Lankans had been interrupted by bees. In 2007, during a cricket match between England while Sri Lanka was batting, bees invaded the Asgiriya Cricket ground in Kandy forcing players to lie down. Kumar Sangakkara who was batting at the time later told the media that he had experienced it twice at the ground. In 2008, a match in India was halted by bees.

“There is nothing to worry about bees in our part of the world. In Sri Lanka it is mainly the giant honey bee (apis dorsata) called ‘bambara’ in Sinhala that forms large swarms that move periodically. But if they do not have a hive to protect, these bees are usually not aggressive,” assures bee expert Dr Wasantha Punchihewa. He also warns that African bees could be more aggressive, so precautions should be taken.

Dr Punchihewa revealed about localised migrations of ‘bambara’ where they move from coastal areas toward the hill country that could cause this kind of encounters. This migration is timed with the flowering of different plants in different areas. “Bambara start to migrate into the dry zone at the start of January when palu and weera common trees in dry zone such as Anuradhapura, Polonnaruwa, Sigiriya begin to flower. They leave these areas in July. The giant honey bee starts moving further south from July and reaches the hill country for the time when the nelu flower blooms.’’

However, we do not have proper data on this migration, so Dr Punchihewa points out the importance of doing research to study this phenomena. The giant honey bee is the species seen at Sigiriya. Dr Punchihewa says this species has social structures where ‘soldier’ bees take care of ‘colony defence’. About three-quarters of the worker population of a colony is engaged in colony defence covering the hive forming a protective curtain. If a threat is sensed, the guard bees exhibit a warning posture, and this signal is transmitted to nearby workers who also adopt the same posture. This creates a wave that travels across the hive with an audible threatening sound. It is a warning that has been issued to the unsuspecting person or animal that you are too close to the comb.

It is also important not to squash any bee as chemical signals emitted could trigger an attack.
Attacks by bees are reported every year from different parts of Sri Lanka. These bees have a venom gland that gets detached from the body. If stung, it is important to remove the sting without squeezing the venom gland as it will inject more venom advises Dr Punchihewa. If stung by a large number of bees, he suggests seeking medical attention.

Honey bees are nature’s prime pollinators and without them the ecological balance will be lost and many of the forest plants will not survive according to Dr Punchihewa. The ‘bambara’ is misunderstood and you can co-exist with them. There is no real need to destroy hives, says Dr Punchihewa.

Often the ‘bambara’ is referred to as a ‘wasp’. But the ‘wasp’ is called ‘debara’ in Sinhala. It is a different species, the bee expert points out.

 

The buzzing Vesak decoration on the 6th floor

May 6, 2015

Decorations adorn many buildings at Vesak – but the staff of an office in Dehiwela found a special decoration covering one of their 6th floor

The curtain of bees covering the Dehiwela office building window

windows: a close look revealed it was a swarm of bees spread like a curtain across a part of a large glass window.

The bees began arriving on the morning of Monday, April 27 around 8am. Soon hundreds, if not thousands of buzzing bees covered the window, said Rajiv Welikala who alerted wildlife enthusiasts about this unusual sighting.

“They are the giant honey-bee or ‘bambara’ in Sinhala – the same species that inhabits Sigiriya,” said bee specialist Dr. Wasantha Punchihewa who visited the site.

Contrary to the popular belief that these bees are harmful, Dr. Punchihewa said they were innocent creatures that attack only if provoked.

In Sigiriya, the occasional bee attacks are often triggered by disturbances caused by visitors but here they would be left in peace: the bee colony settled on an outside of the window of the 6th floor, so chances such as a careless boy throwing a stone etc. can be ruled out.

A closer look at the “curtain”

As the windows of the air-conditioned office are sealed off the bees are unable to come inside, so it is perfectly safe to let such hives be undisturbed, Dr. Punchihewa said, pointing out that honey-bees perform a very important service to the eco-system by pollinating flowers.

In Sigiriya and other remote areas there are enough flowers for these bees to collect nectar but this colony is in Dehiwela amidst concrete jungle, so what chance do the bees have?

“What about the coconut trees? The bees could depend on coconut’s pollen, nectar and in return pollinate the trees,” Dr. Punchihewa surmised.
A bee colony is a complex social structure in which soldier bees are responsible for the safety of the hive. They have a sting linked to a venom sac that detaches from the body in an attack, and this causes the soldier bees’ death.

Bee venom contains melittin, a histamine that is painful for many hours. If a person has been attacked, the sting should be removed without squeezing the venom sac, medical experts said.

Rajiv Welikala said the “bee curtain” looked larger on the day the bees arrived but appears to have shrunk in size as bees started concentrating to form the hive. The wax they are secreting, probably with the aim of building the hive, is visible on the window.

This bee colony could depart soon as the bees realise the difficulty of building a hive on vertical glass or they might stay there for a few months before leaving in search of a new site. Whatever happens, it is fascinating to see the bambara surviving even in populated areas such as Dehiwela, Dr. Punchihewa said.

http://www.sundaytimes.lk/150503/news/the-buzzing-vesak-decoration-on-the-6th-floor-147699.html