Exposure even to low levels of imidacloprid, a widely used pesticide, can harm the central nervous system of bees and may be a reason behind the global bee colony collapse, a National Taiwan University research team said yesterday in Taipei.
Reports from around the world in recent years have shown that the population of wild bees has rapidly declined in many parts of the world. As bees contribute to the pollination of many crop species, ensuring production of seeds in many flowering plants and playing an important role in the ecosystem, many scientists are concerned about the rapid decline in bee colonies.
The university formed an interdisciplinary research team in 2008 to study whether the collapse was caused by the prevalent use of pesticides. A special method that the team developed — putting a tattoo on experimental bees — was applied to track the bees and observe the effects of insecticides on them.
National Taiwan University entomology professor Yang En-cheng (楊恩誠) said researchers discovered that imidacloprid — an insecticide belonging to a class of chemicals called the neonicotinoids — can cause worker bees to lose their way back to their hives.
“Normally, worker bees fly back to their hives when they have suck enough nectar, but when they consume up to about 50ppb [parts per billion] of imidacloprid, they stay on the flower, rubbing their eyes. We can see that they are uncomfortable, and they don’t fly back immediately,” Yang said.
Moreover, the team observed that even exposure to low levels — or just 10ppb — of imidacloprid can cause harm to bee larvae, depriving them of their ability to form and retain memories as they grow, thus contributing to the decline of the bee population.
The use of imidacloprid on certain crops was banned by the EU last year, but it is still widely used in Taiwan, Yang said.
While Taiwan earns about NT$2.3 billion (US$76 million) from honey each year, the government should evaluate whether it should limit the use of imidacloprid and other neonicotinoids, he said.
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Taiwan is to commence mass production of the Tien Kung (天弓, “Sky Bow”) III, IV and V missiles by the second quarter of this year if the legislature approves the government’s NT$1.25 trillion (US$39.78 billion) special defense budget, an official said yesterday. Commenting on condition of anonymity, a defense official with knowledge of the matter said that the advanced systems are expected to provide crucial capabilities against ballistic and cruise missiles for the proposed “T-Dome,” an advanced, multi-layered air defense network. The Tien Kung III is an air defense missile with a maximum interception altitude of 35km. The Tien Kung IV and V
Trips for more than 100,000 international and domestic air travelers could be disrupted as China launches a military exercise around Taiwan today, Taiwan’s Civil Aviation Administration (CAA) said yesterday. The exercise could affect nearly 900 flights scheduled to enter the Taipei Flight Information Region (FIR) during the exercise window, it added. A notice issued by the Chinese Civil Aviation Administration showed there would be seven temporary zones around the Taiwan Strait which would be used for live-fire exercises, lasting from 8am to 6pm today. All aircraft are prohibited from entering during exercise, it says. Taipei FIR has 14 international air routes and
Taiwan lacks effective and cost-efficient armaments to intercept rockets, making the planned “T-Dome” interception system necessary, two experts said on Tuesday. The concerns were raised after China’s military fired two waves of rockets during live-fire drills around Taiwan on Tuesday, part of two-day exercises code-named “Justice Mission 2025.” The first wave involved 17 rockets launched at 9am from Pingtan in China’s Fujian Province, according to Lieutenant General Hsieh Jih-sheng (謝日升) of the Office of the Deputy Chief of the General Staff for Intelligence at the Ministry of National Defense. Those rockets landed 70 nautical miles (129.6km) northeast of Keelung without flying over Taiwan,
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