{"id":534182,"date":"2022-09-23T23:52:20","date_gmt":"2022-09-24T03:52:20","guid":{"rendered":"https:\/\/www.rochester.edu\/newscenter\/?p=534182"},"modified":"2024-12-10T12:36:21","modified_gmt":"2024-12-10T17:36:21","slug":"european-northern-paper-wasps-nest-parasites-534182","status":"publish","type":"post","link":"https:\/\/www.rochester.edu\/newscenter\/european-northern-paper-wasps-nest-parasites-534182\/","title":{"rendered":"Paper wasp parasites turn hosts into long-lived \u2018zombies\u2019"},"content":{"rendered":"

Rochester undergraduates and their professor study what paper wasps\u2014and the parasites that manipulate them\u2014can tell us about evolution, aging, and group living.<\/h2>\n

Wasps are social insects that work together to benefit their hive. When a parasitic insect called Xenos peckii<\/em> infects certain species of paper wasps, however, something incredible happens: the parasite manipulates the wasp\u2019s brain so the wasp loses its social instincts and abandons its colony. The parasite also manipulates the wasp\u2019s genes to increase the wasp\u2019s lifespan.<\/p>\n

This relationship between parasites and wasps makes them an ideal natural experiment for scientists such as Floria Mora-Kepfer Uy<\/a>, a research assistant professor of biology<\/a> at the University of Rochester<\/a>. She aims to better understand what genes are involved in social behavior and aging, not only in insects, but also in human beings.<\/p>\n

\u201cWasp societies have remarkable similarities to human societies, so we use them as a model system to understand which mechanisms are responsible for social behavior, physiology, and aging,\u201d Uy says. \u201cIt\u2019s amazing that a parasite has evolved to make these wasps lose their social instincts and behavior, while manipulating their aging process. It allows us to study very important questions of genes that affect biological processes that can directly relate to human societies and their health.\u201d<\/p>\n

The research is part of Uy\u2019s larger body of work exploring the evolution of cooperation and group living, including the relationship between brain development and sociality.<\/p>\n

This summer, Uy and a group of undergraduate students collected both native Northern paper wasps (Polistes fuscatus<\/em>) and invasive European paper wasps (Polistes dominula<\/em>) at several sites throughout New York, including Genesee Valley Park in Rochester and Robert H. Treman State Park in Ithaca. The researchers hope to reveal the mechanisms that parasites use to manipulate their host\u2019s brains, behavior, and physiology.<\/p>\n

Photos by University of Rochester photographer J. Adam Fenster.<\/em><\/p>\n

\"Group<\/p>\n

NOTHING BUT NET: Team Wasp begins the collection process<\/strong><\/h4>\n

Research Assistant Professor of Biology Floria Mora-Kepfer Uy (far right) and undergraduate students Eisabella Sherwood \u201923 (left), Joseph Krell \u201924, and Federico S\u00e1nchez-Vargas \u201923 (T5) (right), discuss techniques for collecting European paper wasps, an invasive wasp species, in Genesee Valley Park in Rochester.<\/p>\n

The members of Uy\u2019s lab call themselves \u201cTeam Wasp,\u201d according to Uy. \u201cIt\u2019s so much fun for us to be the lab at the University of Rochester that studies social wasps and represents our yellow jacket mascot, Rocky.\u201d<\/p>\n

\"Four<\/p>\n

EYES ON THE PRIZE: The team spots a wasp\u2019s nest<\/strong><\/h4>\n

The student researchers collect paper wasps infected with parasites and bring them back to Uy\u2019s lab on campus to study how the parasites affect their hosts\u2019 brains. The parasite\u2019s main goal is to increase how many offspring it has. To do this, it needs to develop inside a host that lives long enough for the parasite to complete its own growing cycle. The parasite therefore infects and alters its host wasp\u2019s genes to make the wasp live longer, so the parasite itself will live longer. It then manipulates the wasp to abandon its hive to find nests with host larvae to infect.<\/p>\n

\u201cThe parasite needs the wasp to survive long enough to manipulate its brain and allocate all of its resources to the parasite\u2019s babies, not to being social,\u201d Uy says. \u201cThe parasites turn the wasps into these weird zombies.\u201d<\/p>\n

\"Floria<\/p>\n

GREEN SCENE: Contributing to conservation efforts<\/strong><\/h4>\n

In addition to collecting European paper wasps in Genesee Valley Park, Uy collects Northern paper wasps, a species native to North America, in Robert H. Treman State Park in Ithaca, New York. Uy has found invasive European wasp species in Genesee Valley Park and other upstate NY sites, but she has yet to find evidence that the invasive wasps have made it to Treman State Park, about 90 miles away. Uy and her team collect and monitor native paper wasps at this park, which also helps with conservation efforts.<\/p>\n

\u201cWe have a nice synergy with the park team,\u201d Uy says. \u201cI dabble in several research areas, but one of the most important things for me is climate change and conservation. We have a couple of invasive species locally that do affect the native species.\u201d<\/p>\n

\"Students<\/p>\n

CLEAN SWEEP: Using a bug vacuum to collect wasps<\/strong><\/h4>\n

Sherwood, an ecology and evolutionary biology major, uses a special vacuum device to collect a wasp as S\u00e1nchez-Vargas and Krell look on. \u201cConducting independent research in Dr. Uy\u2019s lab has been one of the best decisions I made at UR,\u201d Sherwood says. \u201cI now have experience not only in a lab environment, but also in organizing and performing an entire research project. It\u2019s made me surer of what I want to do in the future and what career I’d like to pursue. I definitely feel more confident as a scientist and a student.\u201d<\/p>\n

\"Floria<\/p>\n

LINE OF SIGHT: Looking for parasites<\/strong><\/h4>\n

Uy uses a magnifying glass to determine if a wasp hosts a parasite. On their native continent, European paper wasps are attacked by their own native parasite, Xenos vesparum<\/em>. And in North America, native paper wasps are attacked by their native parasite, Xenos peckii<\/em>.<\/p>\n

\u201cIn other words,\u201d Uy says, \u201ceach wasp has its own parasitic insect in its native range. One of the things we are investigating is why the North American native parasite infects only the native host and has not also infected the invasive European paper wasp.\u201d<\/p>\n

\"A<\/p>\n

STOMACH BUG: A native paper wasp infected with a parasite<\/strong><\/h4>\n

The researchers can tell if wasps are infected by parasites because the wasps show \u201cstrong symptoms,\u201d Uy says, including aberrant behavior and bumps in their abdomens where the parasites are lodged. Above, a native paper wasp is infected with the parasite Xenos peckii<\/em>, which protrudes from its abdomen.<\/p>\n

\"Student<\/p>\n

SPECIAL DELIVERY: Preparing a nest for transfer<\/strong><\/h4>\n

S\u00e1nchez-Vargas prepares a nest to transfer it to the lab. For the past few years, S\u00e1nchez-Vargas has been studying how a parasite chooses its host and how parasitic infections affect a colony. For instance, he found that before abandoning its hive, an infected wasp becomes \u201ca freeloader,\u201d he says, \u201ctaking resources and contributing nothing back to its hive. Part of my work is asking what happens to the success of a group when individual members are sick and all the responsibilities fall on those that aren\u2019t sick\u2014an issue that certainly extends beyond insect societies.\u201d<\/p>\n

\"Close-up<\/p>\n

NATURE\u2019S NEST EGG: A paper wasp\u2019s nest, complete with larvae to infect<\/strong><\/h4>\n

When the parasite mom is ready to release its larvae, it makes the infected wasp abandon its hive to find other hives to infect. S\u00e1nchez-Vargas also conducted experiments in which he had the right nest (that of a native wasp) and the wrong nest (that of an invasive wasp). The wasp infected with the native parasite always chose to land on the native nest\u2014the \u201cright nest\u201d\u2014to release its larvae.<\/p>\n

\u201cThe parasite mom is very smart,\u201d Uy says. \u201cIt can manipulate the native wasp to find other native wasp nests to infect, and to always deposit the parasite larvae in the right host.\u201d<\/p>\n

\"Four<\/p>\n

HIVE MIND: Cataloguing wasps back at the lab<\/strong><\/h4>\n

Back at Uy\u2019s lab on the University\u2019s River Campus, the researchers catalogue the wasps and rejoin them with their respective nests.<\/p>\n

\u201cWhat I have valued most during my time at the Uy lab has been the opportunity to function as an independent investigator,\u201d says S\u00e1nchez-Vargas, who conducted this research as an undergraduate student. \u201cI\u2019ve been involved at essentially all stages of the work: from conceptualizing and solidifying research questions, developing methods, collecting data, analyzing it, and writing it up. This has given me the opportunity to grow greatly as a young scientist.\u201d<\/p>\n

\"Paper<\/p>\n

ABOVE (CARD)BOARD: Preparing the nests<\/strong><\/h4>\n

The students glue nests to pieces of cardboard that they then mount inside enclosures for further study. In the lab and in the field, the researchers wear several types of gloves to avoid being stung by wasps.<\/p>\n

\u201cOnce in a while, we get an occasional sting, but we try to avoid those as much as possible through training in handling wasps,\u201d Uy says.<\/p>\n

\"Students<\/p>\n

HOME AWAY FROM HOME: \u2018Wasp central\u2019 at Hutchison Hall<\/strong><\/h4>\n

Krell, S\u00e1nchez-Vargas, and Sherwood prepare wasp enclosures in the greenhouse attached to Hutchison Hall on the River Campus. The researchers have turned the greenhouse into \u201cwasp central,\u201d Uy says, with rows of enclosures for the wasps. This setup allows Uy and her students to study different aspects of the wasp-parasite relationship. For instance, S\u00e1nchez-Vargas \u201923 and Maggie Kane \u201922, conducted studies using experimentally infected native and \u201cFrankenstein\u201d wasps<\/a>.<\/p>\n

\u201cAll of these experiments were conducted by undergraduates, but this is graduate-level work,\u201d Uy says.<\/p>\n

\"Triptych<\/p>\n

ZOOM IN: Examining wasps under a microscope<\/strong><\/h4>\n

Under a microscope, the researchers view the parasite Xenos peckii<\/em> attached to the side of the larvae of a Northern paper wasp.<\/p>\n

\u201cSocial insects like wasps are a great model organism,\u201d Uy says. \u201cDuring the pandemic, humans experienced the multiple effects of social isolation. We know the brains of the wasps we work with are really affected when they don\u2019t have social interactions, same as what happens with humans. We have all these amazing parallels that we can compare.\u201d<\/p>\n

\n

<\/a><\/p>\n

Q&A: The making of \u201cFrankenstein\u201d paper wasps<\/strong><\/h3>\n

\"Two<\/p>\n

As undergraduate students, Maggie Kane \u201922 and Federico S\u00e1nchez-Vargas \u201923 (T5) conducted research in the lab of Professor Floria Mora-Kepfer Uy to create \u201cFrankenstein\u201d wasps. In the wild, a native parasite does not infect an invasive paper wasp, and the researchers wanted to understand why.<\/p>\n

Kane experimentally infected the \u201cwrong\u201d host\u2014invasive European paper wasps\u2014with the native wasp parasite Xenos peckii<\/em>, confirming infection is feasible. S\u00e1nchez-Vargas then took native infected wasps and gave the parasite the choice of a native host nest or an invasive host nest. The native parasite always made its host choose the native wasp nest.<\/p>\n

\u201cThe reason we don\u2019t see European wasps infected with native parasites in the wild is because the parasite mom manipulates its host to use odor and visual cues to go to the right place\u2014a native wasp nest\u2014to release her babies,\u201d Uy says. \u201cThe larvae never get dropped off at the wrong nest (the invasive species). This is a level of sophistication where the parasite recognizes and knows where it needs to go to ensure its survival.\u201d<\/p>\n

Kane, who recently started graduate school in molecular biology at Columbia University, and S\u00e1nchez-Vargas, now a Take Five student at Rochester, discuss these studies and how they benefited from conducting research as undergraduate students.<\/p>\n

Can you briefly summarize your research with \u201cFrankenstein\u201d paper wasps?<\/strong><\/h4>\n

Kane:<\/strong> We studied a host-parasite system where the host is a wasp and the parasite is a very small insect that lives within the wasp. The parasite is able to change the behavior and physiology of the wasp, such as making it lazier, increasing its fat bodies, castrating it, and increasing its lifespan, all so that the parasite can grow and reproduce.<\/p>\n

Our main wasp of interest is native to the United States. Interestingly, there is a parallel host-parasite system in Europe, and its host wasp is invasive to the US. While the two systems are so similar, we have never observed the invasive wasp to be parasitized by the native parasite in nature. Fede [S\u00e1nchez-Vargas] and I were interested in why that is and how this parasite has maintained its host specificity.<\/p>\n

S\u00e1nchez-Vargas:<\/strong> My research was focused on several things, including: How does the parasite know how to choose the right host, when many are available but only one is the right \u201chome\u201d? I\u2019ve found that amazingly enough, the parasite Xenos peckii manipulates its host to make the choice for it, taking it to other native wasps\u2019 nests where it can deliver baby parasites to infect a new generation of wasps.<\/p>\n

Why is this research into paper wasps and their parasites important?<\/strong><\/h4>\n

Kane:<\/strong> The success of an invasive species is often attributed to a loss of predators. Our experiments help us better understand how an invasive species deals with or evades predators. Also, by determining how these wasps evade parasitism and how the parasites work to get around such defenses, we can get a better understanding of many other host-parasite systems, not just invasive ones.<\/p>\n

S\u00e1nchez-Vargas:<\/strong> One of the most interesting kinds of natural relationships between organisms is the parasite-host dynamic, where one animal (the parasite) exploits another (the host) for its own benefit. Because this is a pretty nasty arrangement, parasites have to evolve quite nifty solutions to be able to maintain their place in the race against getting outsmarted by their host. For one, understanding parasitic relationships can teach us a lot about disease at large.<\/p>\n

What made you interested in this type of research?<\/strong><\/h4>\n

Kane:<\/strong> I have always loved nature and animals. In college I was interested in biological research; however, I wasn\u2019t sure I wanted to focus solely on molecular biology. Dr. Uy\u2019s lab seemed like a great mix of a wet lab and field research. I got to do so many cool things, such as catching and handling wasps, that I never would have done in a classical molecular biology lab.<\/p>\n

S\u00e1nchez-Vargas:<\/strong> Dr. Uy asks \u201cultimate\u201d questions about why things in the natural world are as they are, and how they can be explained in evolutionary terms. The natural world is beautiful in its complexity, not just in the massive numbers of species out there but in the diversity and variety of their behavior. I chose to work with Dr. Uy because I knew I would learn the questions and techniques that scientists use to understand this diversity.<\/p>\n

Maggie, how did this experience help prepare you for graduate school?<\/strong><\/h4>\n

Kane:<\/strong> Dr. Uy is a very hands-on and invested mentor. I learned everything from how to read a scientific paper, to designing experiments, to analyzing and interpreting results. I was able to immerse myself in the scientific process, while learning just how much hard work and dedication research takes. Dr. Uy invested a lot of time into me becoming an independent researcher, and these experiences helped me realize my passion for research and love of science.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

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