- Author: Kathy Keatley Garvey
It's early morning, Aug. 20. A lady beetle is snacking on aphids on our native milkweed plant (where the monarchs are supposed to be, but aren't!). And then, apparently satiated, LB climbs a twig to the top of her Mt. Everest, looks around, unfolds her wings, and takes off.
The miracle of flight! The miracle of unpacking what's under those wings. The miracle of seeing it all happen.
"The ladybug is a tiny insect with hind wings four times its size," wrote Joanna Klein in her article,
Ladybugs Pack Wings and Engineering Secrets in Tidy Origami Packages, in the May 18, 2017 edition of The New York Times. "Like an origami master, it folds them up into a neat package, tucking them away within a slender sliver of space between its abdomen and the usually polka-dotted, harder wings that protect it.
"When it is time to take off, it deploys its flying apparatus from beneath its colorful shell-like top wings, called the elytra, in only a tenth of a second. And when it lands, it folds it back in just two. Switching between flying and crawling many times in a day, the ladybug travels vast distances."
Klein called attention to a study published in the May 17, 2017 edition of the Proceedings of the National Academy of Sciences. The authors, she said, detailed "just how the ladybug manages to cram these rigid structures into tiny spaces is a valuable lesson for engineers designing deployable structures like umbrellas and satellites."
It's the work of Kazuya Saito of the Institute of Industrial Science, University of Tokyo, Japan, and his colleagues, Shuhei Nomura, Shuhei Yamamoto, Ryuma Niiyama and Yoji Okabe.
The title? "Investigation of Hindwing Folding in Ladybird Beetles by Artificial Elytron Transplantation and Microcomputed Tomography."
The significance? "Hindwings in ladybird beetles successfully achieve compatibility between the deformability (instability) required for wing folding and strength property (stability) required for flying. This study demonstrates how ladybird beetles address these two conflicting requirements by an unprecedented technique using artificial wings. Our results, which clarify the detailed wing-folding process and reveal the supporting structures, provide indispensable initial knowledge for revealing this naturally evolved optimization system. Investigating the characteristics in the venations and crease patterns revealed in this study could provide an innovative designing method, enabling the integration of structural stability and deformability, and thus could have a considerable impact on engineering science."
The abstract? "Ladybird beetles are high-mobility insects and explore broad areas by switching between walking and flying. Their excellent wing transformation systems enabling this lifestyle are expected to provide large potential for engineering applications. However, the mechanism behind the folding of their hindwings remains unclear. The reason is that ladybird beetles close the elytra ahead of wing folding, preventing the observation of detailed processes occurring under the elytra. In the present study, artificial transparent elytra were transplanted on living ladybird beetles, thereby enabling us to observe the detailed wing-folding processes. The result revealed that in addition to the abdominal movements mentioned in previous studies, the edge and ventral surface of the elytra, as well as characteristic shaped veins, play important roles in wing folding. The structures of the wing frames enabling this folding process and detailed 3D shape of the hindwing were investigated using microcomputed tomography. The results showed that the tape spring-like elastic frame plays an important role in the wing transformation mechanism. Compared with other beetles, hindwings in ladybird beetles are characterized by two seemingly incompatible properties: (i) the wing rigidity with relatively thick veins and (ii) the compactness in stored shapes with complex crease patterns. The detailed wing-folding process revealed in this study is expected to facilitate understanding of the naturally optimized system in this excellent deployable structure."
But back to our little lady beetle in our pollinator garden. It's difficult to catch a lady beetle in flight. They don't fly when you WANT them to, and when they do fly, you and your camera are NOT ready. And when you and your camera ARE ready, all focused and everything, they change their mind or change directions. So, in keeping with our motto, "Don't poke 'em, prod 'em or pin 'em," we waited.
With the morning sun behind her back, LB finally obliged and took flight.
We managed to catch the action with a Nikon Z7 with a Nikon 105mm lens, manually focused: F-stop 16; shutter speed, 1/2500 of a second; and ISO, 5600.
Here's hoping LB will return. She missed a few aphids!
- Author: Kathy Keatley Garvey
It's one of the highest honors a scientist can receive. Members are elected to NAS in recognition of their distinguished and continuing achievements in original research.
Agrawal received his doctorate in population biology in 1999 from UC Davis, working with major professor Richard "Rick" Karban, UC Davis Department of Entomology and Nematology.
"Anurag is an inspiration as a scientist and as a person," Karban said. "I've learned a lot from him."
At Cornell, Agrawal is the James A. Perkins Professor of Environmental Studies in the College of Agriculture and Life Sciences. He researches the ecology and evolution of interactions between wild plants and their insect pests, including aspects of community interactions, chemical ecology, coevolution and the life cycle of the monarch butterfly.
Agrawal is the author of the celebrated book, Monarchs and Milkweed: A Migrating Butterfly, a Poisonous Plant, and Their Remarkable Story of Coevolution, published in 2017 by Princeton University Press. The book won a 2017 National Outdoor Book Award in Nature and Environment and an award of excellence in gardening and gardens from the Council of Botanical and Horticultural Libraries. It was also named one of Forbes.com's 10 best biology books of 2017. Read a review of his Monarchs and Milkweed book from the journal Ecology and read the first chapter here. (You can order the book here.)
As Agrawal said in a Cornell news release, “It's a tremendous honor and totally unexpected. I look forward to representing Cornell and also playing a part in the NAS role of advising the U.S. government on science policy.”
"A key research focus for Agrawal's Phytophagy Lab is the generally antagonistic interactions between plants and insect herbivores," according to the Cornell news release. In an attempt to understand the complexity of communitywide interactions, questions include: What ecological factors allow the coexistence of similar species? And what evolutionary factors led to the diversification of species? Agrawal's group is currently focused on three major projects: the community and evolutionary ecology of plant-herbivore relationships; factors that make non-native plants successful invaders; and novel opportunities for pest management of potatoes. Recent work on toxin sequestration in monarch butterflies was featured on the cover of the April 20 issue of Proceedings of the National Academy of Sciences."
Agrawal holds two degrees from the University of Pennsylvania, a bachelor's degree in biology and a master's degree in conservation biology. He joined the Cornell faculty in 2004 as an assistant professor of ecology and evolutionary biology, with a joint appointment in the Department of Entomology. He advanced to associate professor in 2005, and to full professor in 2010. He was named the James A. Perkins Professor of Environmental Studies in 2017.
A fellow of the American Association for the Advancement of Science (2012), and recipient of the American Society of Naturalist's E.O. Wilson Award in 2019, Agrawal won the Entomological Society of America's 2013 Founders' Memorial Award and delivered the lecture on Dame Miriam Rothschild (1908-2005) at ESA's 61st annual meeting, held in Austin, Texas.
Agrawal was at UC Davis in January of 2012 to present a seminar on "Evolutionary Ecology of Plant Defenses." His abstract: "In order to address coevolutionary interactions between milkweeds and their root feeding four-eyed beetles, I will present data on reciprocity, fitness tradeoffs, specialization and the genetics of adaptation. In addition to wonderful natural history, this work sheds light on long-standing theory about how antagonistic interactions proceed in ecological and evolutionary time."
Members are elected to NAS in recognition of their distinguished and continuing achievements in original research. Among those previously elected to NAS: Bruce Hammock, UC Davis distinguished professor of entomology who holds a joint appointment with the UC Davis Comprehensive Cancer Center. He was elected to NAS in 1999.