Do adult periodical cicadas actually feed on anything?
Analysis of Brood X cicadas' gut contents finds plant DNA, settling long-standing scientific debate
2023-10-18
(Press-News.org) Annapolis, MD; October 18, 2023—Every so often, cicadas emerge above ground and blanket the earth with their exoskeletons while emitting a high-pitched chirp from sunrise to sunset. The periodical cicadas in the genus Magicicada come every 13 or 17 years, though other types of cicadas emerge much more frequently in our neighborhoods. A long-standing agricultural query related to the periodical cicadas was recently answered by an Agricultural Research Service (USDA-ARS) research team at West Virginia's Appalachian Fruit Research Station. Simply: Once periodical cicadas emerge, do they actually feed on vegetation?
Magicicada pose a threat to U.S. agriculture due to their ability to damage orchard trees when they lay their eggs on tree branches. Many growers and nurseries take this into consideration and refrain from planting new trees in years when periodical cicadas emerge, as their eggs can kill young trees.
ARS researchers investigated the best way to solve this agricultural challenge by reviewing the life history, reproductive biology, and evolutionary relationships of cicadas over the past 150 years. But many have often disagreed about whether, or how much, the adults feed. This is because the needle-like mouthparts of cicadas do not leave much evidence of any feeding, unlike chewing insects, and their digestive tracts that are notoriously difficult to dissect. USDA-ARS researchers studied adult male and female Magicicada during the 2021 emergence of Brood X in Maryland, Virginia, and West Virginia as the insect moved through apple orchards and wooded public parks and residential properties.
The findings, published October 18 in the Entomological Society of America's open-access Journal of Insect Science, disrupted the age-old popular myth of adult periodical cicadas not feeding. Scientists found mainly woody plant and Malus, or apple tree DNA, in adult cicada guts and found that 54 percent of those cicadas contained DNA from multiple plant species.
While this strongly implies that adult Magicicada feed on plant sap, it was necessary to show that the recovered plant DNA was not just leftovers from meals eaten during the nymph stage.
"We tested teneral adults, or brand new adult Magicicada that had not had a chance to feed yet, to check for any leftover plant DNA," said USDA-ARS research team leader James Hepler, Ph.D. "We couldn't find any plant DNA in the guts of teneral adults, so we can be reasonably sure that the DNA found in mature adult Magicicada was eaten during the adult stage, since no DNA carries over from the nymph stage."
Cicadas appear to have highly permeable exoskeletons that permit considerable water loss and allow water to evaporate out of the insect a little easier than many other insects. Also, the presence of essential amino acid-producing endosymbionts in the gut tissues of adult Magicicada imply that, despite the water loss, some nutrition is being derived as they feed on plant species.
USDA-ARS will continue to examine the life cycle of Brood X and solve agricultural challenges directly related to their life span above ground. More studies will also be conducted to look at the impact that adult Magicicada contribute to tree physiology.
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"Do adult Magicicada (Hemiptera: Cicadidae) feed? Historical perspectives and evidence from molecular gut content analysis" will be published online on October 18, 2023, in the Journal of Insect Science. Journalists may request advance copies of the article via the contacts below or download the published paper after 10 a.m. U.S. Eastern Time, October 18, 2023, at https://doi.org/10.1093/jisesa/iead082.
CONTACT:
Autumn Canaday, USDA Agricultural Research Service, autumn.canaday@usda.gov, 202-669-5480
Joe Rominiecki, Entomological Society of America, jrominiecki@entsoc.org, 301-731-4535 x3009
ABOUT:
The Agricultural Research Service is the U.S. Department of Agriculture's chief scientific in-house research agency. Daily, ARS focuses on solutions to agricultural problems affecting America. Each dollar invested in agricultural research results in $20 of economic impact. USDA is an equal opportunity provider, employer, and lender.
The Entomological Society of America is the largest organization in the world serving the professional and scientific needs of entomologists and people in related disciplines. Founded in 1889, ESA today has more than 7,000 members affiliated with educational institutions, health agencies, private industry, and government. Headquartered in Annapolis, Maryland, the Society stands ready as a non-partisan scientific and educational resource for all insect-related topics.
The Journal of Insect Science publishes research on all aspects of the biology of insects and other arthropods from the molecular to the ecological, and their agricultural and medical impact. For more information, visit https://academic.oup.com/jinsectscience, or visit www.insectscience.org to view the full portfolio of ESA journals and publications.
END
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[Press-News.org] Do adult periodical cicadas actually feed on anything?
Analysis of Brood X cicadas' gut contents finds plant DNA, settling long-standing scientific debate
