Scientists with the Pennsylvania State University Center for Pollinator Research received three grants from the U.S. Department of Agriculture and the National Science Foundation to study various threats to honey bees, including disease, pesticides and the extinction and invasion of other species into their habitats.
* Investigating disease. A team of scientists that includes Christina Grozinger, associate professor of entomology and director of the Center for Pollinator Research, will use a $467,000 grant from USDA to examine and develop tools to mitigate the effects of a gut parasite, Nosema ceranae, that negatively impacts honey bees and has been linked to colony losses.
"The microsporidian parasite N. ceranae is widespread throughout the U.S. and the world. This parasite interferes with the digestive system and metabolic function of honey bees, leading to increased mortality of individual bees, which, in turn, can profoundly impact the social structure and health of the colony. This parasite is regarded as a key threat to bee health and has been implicated in alarming colony losses" Grozinger said.
Grozinger and her colleagues, including scientists at the USDA's Bee Research Laboratory and the University of Kentucky, will use genomic and genetic techniques to improve the current understanding of how N. ceranae infects bees and spreads throughout their colonies. They will characterize the genes that enable this parasite to invade honey bee tissues, and use this information to develop specific therapeutics to reduce the parasite's virulence and the host's susceptibility to infection.
* Poring over pesticides. Other scientists in the Center for Pollinator Research will investigate the effects of pesticides on honey bees using a second grant from the USDA for $370,000.
"Modern pesticide formulations, particularly when multiple active ingredients are blended, require proprietary adjuvants and 'inerts' to achieve high efficacy for targeted pests," said Christopher Mullin, professor of entomology. "Recently, we have shown that honey bees are unusually sensitive to organosilicone spray adjuvants and other coformulants used in agrochemicals."
In this project the team, which includes Maryann Frazier, senior extension associate, will analyze the presence and fate of organosilicone spray adjuvants and other coformulants in bee ecosystems. Specifically, they will identify common inerts in agrochemicals and other environmental chemicals used frequently around honey bees or in their preferred foraging areas; develop analytical methods to monitor and determine the fate of pesticide formulation and adjuvant ingredients within bee ecosystems; determine acute and sub-lethal effects of pesticides, their formulation ingredients, important metabolites and relevant combinations on bee physiological and behavioral systems; and facilitate integration and communication of results to beekeepers, growers, pesticide regulators, the agrochemical industry and the research community.
* Examining effects of extinction and invasion. A third grant, funded by the National Science Foundation for $300,000, will enable researchers to investigate the impacts of extinctions and invasions on community stability and biodiversity. The team, which includes Colin Campbell, postdoctoral scholar in biology, Katriona Shea, professor of biology, and Reka Albert, professor of physics and of biology, will model perturbations to ecosystem structure, specifically the permanent or temporary removal or introduction of one or more species.
"This model will allow us to assess which species and ecosystem properties contribute to the susceptibility of an ecosystem to catastrophic failure, and which contribute most to stability," Campbell said.
According to Shea, the need to address the impacts of environmental perturbations is increasingly urgent.
"The addition or loss of species to existing ecological communities can have far-reaching consequences for both the community and the greater ecosystem in which the community is embedded," she said. "For example, the recent, rapid decline in pollinator levels poses a serious risk to global agriculture and food security. This project will advance our knowledge of how these complex systems function. Only if we can anticipate the effects of environmental perturbations can we act to prevent or ameliorate undesired outcomes."