Oz scientists tag bees in first such study into crop pollination

Oz scientists tag bees in first such study into crop pollination

Thousands of honey bees in Australia are being fitted with tiny sensors as part of a world-first research programme to monitor the insects and their environment using a technique known as “swarm sensing”.

The research is being led by research agency CSIRO and aims to improve honey bee pollination and productivity on farms, as well as helping to understand the drivers of bee colony collapse disorder, a condition that is hammering honey bee populations worldwide.

Up to 5,000 sensors, measuring 2.5mm by 2.5mm, are being fitted to the backs of the bees in Hobart, Tasmania, before being released into the wild. It's the first time such large numbers of insects have been used for environmental monitoring.

Free pollination service

"Honey bees play a vital role in the landscape through a free pollination service for agriculture, which various crops rely on to increase yields," said CSIRO science leader Paulo de Souza, who is leading the swarm sensing project.

A recent CSIRO study showed bee pollination in faba beans can lead to a productivity increase of 17%.”

Around one-third of the food humans eat relies on pollination, but honey bee populations around the world are crashing because of the varroa mite and colony collapse disorder. Australia, however, is currently free from both of those threats.

The research will also look at the impact of agricultural pesticides on honey bees by monitoring insects that feed at sites with trace amounts of commonly used chemicals.

"Using this technology, we aim to understand the bee's relationship with its environment. This should help us understand optimal productivity conditions as well as further our knowledge of the cause of colony collapse disorder," Added De Souza.

The tiny Radio Frequency Identification sensors work in a similar way to a vehicle's e-tag, recording when the insect passes a particular checkpoint. The information is then sent remotely to a central location where researchers can use the signals from the 5,000 sensors to build a comprehensive, three-dimensional model and visualise how these insects move through the landscape.

Boosting productivity

Bees are social insects that return to the same point and operate on a very predictable schedule. Any change in their behaviour indicates a change in their environment. 

If we can model their movements, we'll be able to recognise very quickly when their activity shows variation and identify the cause. This will help us understand how to maximise their productivity as well as monitor for any biosecurity risks," said De Souza.

"Many growers rely on wild bees or the beekeepers to provide them with pollinators so they can improve their crops each year. Understanding optimal conditions for these insects will improve this process.” 

To attach the sensors, the bees are refrigerated for a short period, which puts them into a rest state long enough for the tiny sensors to be secured to their backs with an adhesive. After a few minutes, the bees awaken and are ready to return to their hive and start gathering valuable information.

The next stage of the project is to reduce the size of the sensors to only 1mm so they can be attached to smaller insects such as mosquitoes and fruit flies.

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