Links between low quality pollen and bee survival

  • April 27, 2016
Links between low quality pollen and bee survival

Eating low quality pollen could protect bees from parasites, says new study.

Eating low quality pollen may protect bees from attack by parasites, according to a new study.

The study, now available online and published in the American Naturalist in June, says that a low quality diet may have compensatory benefits for bees because it protects them from their natural enemies.

Those natural enemies include parasitical wasps, which form the largest group of wasps. These place their larvae into or next to the eggs or larvae of other insects, including bees. When the wasp larva hatches from the egg, it feeds on its host. The fully fed wasp larva then forms a pupa, and eventually an adult parasitic wasp emerges.

In the new study, researchers, including first author Dakota Spear, a Gates Cambridge Scholar in the Department of Zoology, studied the rate of parasitic feeding by wasps on mason bees which specialise in eating low-quality pollen from the plant family Asteraceae. They compared them with parasitic feeding on bees eating higher quality pollen.

They found that bees eating low quality pollen were significantly less frequently the target of parasitic feeding than other bee species.

They then fed wasp larvae three different types of pollen mixture, including Asteraceae pollen. The wasp larvae were much less likely to survive if it was fed on the Asteraceae pollen.

Dakota Spear [2015], who is doing an MPhil in Zoology, said: "This study broadly demonstrates that protection from parasitism may be one of the forces driving the evolution of specialisation in low-quality pollen in bees. This study increases our understanding of the evolution of host-parasite interactions between bees and their parasites, a topic that may be particularly relevant as bee populations decline around the world, in many cases due to increased prevalence and virulence of parasites and pathogens. Our results suggest that in the long-term, the ability to specialise in unpalatable foods could help protect specialist bee species from parasites, especially as humans influence the distribution or pervasiveness of parasites through climate change and species introductions."

She adds that understanding the defensive potential of lower quality pollen could open up new avenues for boosting bee survival rates, such as the possibility of making those types of pollen more widely available in agricultural land, to reduce parasitism rates.

*Picture credit: Wikimedia.

 

Dakota Spear

Dakota Spear

  • Alumni
  • United States
  • 2015 MPhil Biological Science (Zoology)
  • Churchill College

As an undergraduate studying biology at Pomona College, I developed a particular interest in the interaction between human development and adjacent ecosystems, and the ways through which human society both benefits from and impacts these ecosystems. My research has focused on the effects of urban development on biodiversity and ecosystem function, and how we can use citizen science as a tool for both urban biological research and community engagement and education. At Cambridge, I studied the impact of various understory management practices on spider diversity and pest control potential in oil palm plantations of Sumatra, Indonesia. My goal through this research was to illuminate the benefits we receive by maintaining biodiversity in large-scale agricultural systems, and practical methods we can use to do so. I currently live and work in Seattle, Washington, USA, where I help connect underserved audiences to engaging science education at the Pacific Science Center.

Previous Education

Pomona College

Latest News

‘Tackle climate change misinformation through computational social science’

Future leaders and researchers need to be urgently trained to tackle climate change misinformation through an interdisciplinary approach that foregrounds computational social science and extends beyond laboratories and university campuses to shape the science-policy interface and rebuild public trust in climate research, according to leading academics. Writing in Nature Human Behaviour, the academics, including Dr Ramit […]

An existential psychological thriller for aesthetes

Christy Edwall’s first novel, History Keeps Me Awake at Night, out in early February, has been described as “an existential psychological thriller for aesthetes and lovers of cultural London and the world… A story cleverly told of a young woman involved in contemporary forms of global voyeurism”. It tells the story of Margit, a London […]

A detective of ancient climate change

Stijn De Schepper is an ancient detective. His job is to investigate past climate change through working his way down the ocean bed, starting with today’s sediment and moving back through thousands of years of Earth’s history.  He maps ancient marine sediments to find out if, why and how the environment changed in the past. […]

The rich history inside ancient texts

The ancient Greek texts Daniel Hanigan [2019] has been studying for the last three years have been seen as a kind of ancient lonely planet guide, but he found something much more interesting which went to the heart of the ancient Greek experience and how it evolved over time.   He says: “The periploi have […]