Blogs from our Scientific Researchers

Carnegie Museum of Natural History is home to active research and vast scientific collections. Our scientific researchers regularly contribute to the blog at the museum.

June 10, 2021 by wpengine

New Anthropocene Publication: Stemming the Tide

by Nicole Heller

Blue and white cover of a book. Title: Stemming the Tide: Global Strategies for Sustaining Cultural Heritage Through Climate Change. Edited by Rebecca Rushfield.

I am pleased to share this Smithsonian Scholarly Press publication, Stemming the Tide: Global Strategies for Sustaining Cultural Heritage Through Climate Change. The e-book, edited by Rebecca Rushfield, is available online and freely available to read and download. It is the product of an international symposium organized and hosted by the Smithsonian Institution, Washington DC, March 5 – 6, 2020. According to Amber Kerr, Chief of Conservation, Smithsonian American Art Museum “The objective of the symposium was to empower cultural heritage authorities, managers, and advocates to pursue more ambitious engagement with, and collaborative approaches to, the climate crisis,” and “250 registrants and 1,100 live web stream viewers representing 33 states and 25 countries ranging from the United Kingdom, Spain, and Greece to Canada, Mexico, and Trinidad and Tobago” took part.

I was honored to be invited to participate and frame remarks about museums and climate change. Looking back, the symposium was at the beginning of difficult times. The crisis of the coronavirus pandemic was just becoming a known reality. I recall forgoing handshakes and hugs, and instead bumping elbows, with the awesome group of global professionals assembled.

Perhaps for this reason, seeing this volume published now gives me extra pause, and feels especially symbolic of the interconnections between people and planet – past, present and future – and the risks we face in the early 21st century. As Lonnie G. Bunch III, Secretary of the Smithsonian Institution, writes in the forward “This publication invites us to put our heads together and lead the cultural heritage sector in addressing the most pressing issue of our time.”

My chapter, “Museums Facing Climate Change. All Hands On Deck: Moving Past Climate Science and Into Culture,” is about the special opportunity for museums to lead on climate change action and education in their communities, and draws on the good works started at the Carnegie Museum of Natural History with We Are Nature: Living in the Anthropocene and Climate Systems Partnerships. Other chapters explore a wide range of issues. For example, there are chapters on adapting cultural heritage sites and historic buildings to increased risks from extreme weather and sea level rise, ensuring the preservation of collections and archeological sites, supporting resilience of displaced communities, sustaining and respecting Indigenous knowledge and storytelling, as well as tools for mitigating greenhouse gases and improving sustainability practices in collections and exhibition practices.

While intended for a professional audience, I imagine this book will be relevant to anyone concerned about human-caused climate change and interested in the diverse opportunities and challenges it presents. I commend the Smithsonian Institute for leadership in organizing the symposium and publishing this valuable resource. I look forward to using it with my colleagues at the Carnegie Museums and here in Pittsburgh toward pursuing more ambitious engagement and collaborative approaches to the climate crisis.

Read Stemming the Tide: Global Strategies for Sustaining Cultural Heritage Through Climate Change free online.

Nicole Heller is Curator of Anthropocene Studies at the Carnegie Museum of Natural History. Museum employees are encouraged to blog about their unique experiences working at the museum.

Student of the World; Part 2: Stearns and Bayet

by Joann Wilson and Albert Kollar

“His [Frederick Stearns] love for that which was beautiful and useful, led him to collect a vast amount of material covering so many fields of human effort…”

Detroit Free Press, January 15, 1907

Fossils pass through many hands. Some hands hold discoveries, some buy and sell, others study and organize. Behind every fossil is a story and hopefully, for those in museum collections, a specimen label. With luck, the geology and paleontology of the label script is accurate. Beginning with the creation of the first color geological map by William Smith in 1815 and the subsequent organizing of the Geologic Time Scale in 1823, paleontologists worked to validate stratigraphy by collecting and describing new species from exposed strata in Europe and North America. It was not until the publication of Charles Darwin’s The Origin of Species in 1859 that paleontological work shifted to include studying evolution as documented by fossil evidence.

Today we understand that many hands aided fossil discovery, often in anonymity. Thanks to technology and through a focus shift to the individuals behind the specimens, we can now provide a fuller picture of the past that acknowledges the roles of collectors, dealers, indigenous cultures, women, quarry workers, and all who aided in the pursuit of fossils.

In the basement of Carnegie Museum of Natural History, behind a set of gray steel doors in the Section of Invertebrate Paleontology, is an astonishing assembly of archival documents from the Bayet Collection. Andrew Carnegie made front page news in 1903 by purchasing an estimated 130,000 fossils from Ernest Bayet of Brussels. Along with the fossils, the museum also received hundreds of documents written primarily in French, German, and Italian. Most of it has remained untranslated, until now.

Thanks to volunteer Lucien Schoenmakers of the Netherlands, details of fossil trades and purchases from over 100 years ago provide links to narratives that have yet to be told. Join us as we start the journey. Our series, which began with an examination of correspondence between fossil collector Frederick Stearns and his client, Bayet, continues here with a deeper profile of Stearns.

Frederick Stearns, date unknown. Permission of the University of Michigan Stearns Collection.

Frederick Stearns of Detroit was a man not born into wealth, but with a passion for education, art, and science. His early life revolved around diligence, not fossils. Born in Lockport, New York in 1831, Stearns quit school at age 14 to find a job. Within a year, he found work as an apprentice to a pharmacist in Buffalo, New York. Of his early life, he later said, “one of my earliest memories is looking into the windows Dr. Merchant’s Gargling Oil Drug store and wondering at the mystery of the white squares of magnesia and the round balls of chalk.” Eventually, Stearns moved to another pharmacy, and became partner, but he was not convinced that Buffalo, New York was his ticket to success.

On a frosty New Year’s Day in 1855, Stearns, newly married and just 24 years of age, crossed the frozen Detroit River by foot to start anew. Of that period, he later said, “little money, fair credit, high hope.” He opened a retail pharmacy in Detroit. To reach customers, he made short trips to the surrounding area, leaving samples of his products. Over time, his business expanded to the manufacture of pharmaceuticals. In 1877, he made history by installing the first telegraph line in the city of Detroit. But despite the success, Stearns dreamed of the education lost to him when he left school at the age of 14. In 1887 at age 56, he turned the business over to his sons and he began to travel the world. Over the next twenty years, he collected many items, including fossils.

William Smith’s 1815 Color Geological Map.

Stearns pursuits led him to Africa, Europe, and Asia. In the late 1800’s, a voyage to Japan required weeks of travel as compared to a current 14-hour flight from New York to Tokyo. In the early 1890’s, Stearns travelled to Japan twice for the purpose of studying mollusks and other marine life. In a book published in 1895 titled, “Catalog of the Marine Mollusks of Japan,” Stearns credits Japanese fisherman Morita Seto for assisting in the collection of over “1000 forms of marine life.”

But Stearns interest did not stop with mollusks. He also collected fossils, art, and musical instruments. His collection of musical instruments at the Stearns Collection of Musical Instruments at the University of Michigan, in Ann Arbor Michigan, is considered one of the finest in the world.

For a short time, Stearns also collected fossils. Between 1888-1889, he wrote two letters to Ernest Bayet about a trade deal. Stearns first letter offers a clue as to how they met. Both men appear to have known fossil dealer Lucien Stilwell of Deadwood, South Dakota. The trade between Stearns and Bayet did not go smoothly, but it does have a happy ending.

Stearns was a student of the world until the very end. In 1907, just days before he was scheduled to sail for Egypt, he became ill and died. At his passing, the Detroit Free Press wrote, “A remarkable phase of Mr. Stearns’s activities as a collector was their diversity… and all of this for the simple love of learning things that he might tell them to others without price.”

Many thanks to the generous contributions of Carol Stepanchuk, Outreach and Academic Projects at the U-M Stearns Collection of Musical Instruments Lieberthal-Rogers Center for Chinese Studies and Joseph Gascho, Associate Professor at the University of Michigan School of Music and Director of the Stearns Collection of Musical Instruments. Many thanks to volunteer Lucien Schoenmakers’ ongoing effort to translate archival Bayet documents written in French and German.

Joann Wilson is an Interpreter in the Education Department at Carnegie Museum of Natural History and Albert Kollar is Collections Manager for the Section of Invertebrate Paleontology. Museum employees are encouraged to blog about their unique experiences and knowledge gained from working at the museum.

Collected on this Day in 1982: One specimen isn’t always enough!

Archiving biological variation.

by Mason Heberling

Five herbarium sheets with specimens of trillium on them arranged with the smallest leaves on the left and largest on the right.

This specimen is not a specimen but a set of five specimens! Same species (large flowered trillium, Trillium grandiflorum). Same site (in Somerset county, PA). All collected on same date (June 4, 1982) by Frederick H. Utech and Masashi Ohara.

We know that one specimen of every species is not enough. Having many specimens of many species, across many sites, and through time are necessary to document what organisms lived where, when, how far species ranges extend, and how these change through time. We study these specimens to understand biodiversity and biodiversity change across many scales.

But why collect that many vouchers of the same species, from the same site, on same date? One reason might be to send “duplicate” vouchers to other herbaria, both to help other collections expand their holdings, to get expert opinions on identification, and/or to protect against (unlikely but very possible) damage that may happen in one herbarium (like fire, flood, insect damage – oh my!).

But that isn’t what happened here. All specimens are stored together at Carnegie Museum of Natural History.

Voucher series of trillium herbarium specimen sheets.

So why? Well, it is simple, but quite genius, really. Utech and Ohara collected a “life history” voucher series. That is, these specimens each show different stages of the species’ development from small cotyledon-bearing seedlings just germinating above ground, to one leaved plants, to small to large three leaved juvenile trilliums that have not yet flowered, to large adult plants with flowers.

Utech and Ohara, along with Shoichi Kawano, pioneered this method of collecting and advocated for its importance in a 1984 essay in the Journal of Phytogeography and Taxonomy. Historically, plant specimens are collected with a major specific purpose in mind – to document the plant was there at a given time. To do that, botanists of course collect specimens that are best for identification, such that others can verify the species. For most species, that means plants tend to be collected when they are adults and reproductive (with flowers and/or fruits). Specimens without reproductive organs (called “vegetative” specimens) are generally viewed as less useful for this purpose and often avoided.

But Utech and others found that this standard approach, though useful for some research, did not cut it for their work. As organismal biologists studying the life history, ecology, and life cycle of species, they found many species were not well represented in herbarium collections.

Many species, like trillium, have distinct life stages from seedling to juvenile to adult. Many species form overwintering leaves or juvenile leaves that differ dramatically, even unrecognizably, from “typical” adult specimens.

So there’s good reasons to collect across life history and across individuals within a population. Biological collections are all about archiving biodiversity in its many forms, whether across deep time with fossils, across species, within species, or even within populations at a specific site.

Man at a table of plant specimens talking to a child about them. — Dr. Frederick H. Utech, past curator at Carnegie Museum, at a member’s night in 1979.

Dr. Utech (1943-2021) was a curator at the museum from 1976 until 1999. He was then a research botanist at the nearby Hunt Institute for Botanical Documentation until his retirement in 2011, notably contributing to three volumes of the Flora of North America project. More than 23 thousand specimens in the Carnegie Museum herbarium were collected by him. Dr. Utech passed away earlier this year but his legacy lives on. You can find his obituary here.

Inspired by the method of life history series and the need for new perspectives in the way we collect, CMNH Botany staff are working to promote and expand these ideas. We are presenting some of these ideas at the Society of Herbarium Curators annual meeting later this summer.

Find many more specimens (24,662 to be exact!) collected by Dr. Utech (including other life history series vouchers) here.

Check back for more! Botanists at the Carnegie Museum of Natural History share digital specimens from the herbarium on dates they were collected. They are in the midst of a three-year project to digitize nearly 190,000 plant specimens collected in the region, making images and other data publicly available online. This effort is part of the Mid-Atlantic Megalopolis Project (mamdigitization.org), a network of thirteen herbaria spanning the densely populated urban corridor from Washington, D.C. to New York City to achieve a greater understanding of our urban areas, including the unique industrial and environmental history of the greater Pittsburgh region. This project is made possible by the National Science Foundation under grant no. 1801022.

Mason Heberling is Assistant Curator of Botany at Carnegie Museum of Natural History. Museum employees are encouraged to blog about their unique experiences and knowledge gained from working at the museum.

Leaping Slugs! Did that Slug Just Jump?

by Timothy A. Pearce

Some species of slugs and snails can thrash their tail from side to side, twitching with such vigor that the creatures seem to jump. In some cases, they can become airborne briefly. I don’t know whether this behavior can properly be called jumping, but given that slugs are the quintessential slow-moving animals (slugs gave their name to the word sluggish), the vigorous twitching is certainly an un-slug-like behavior.

In contrast to slugs, snails keep their internal organs (guts) within the shell on their back and they have a strong, nimble, muscular foot. Slugs, which evolved from snails, have hollowed out their foot to accommodate their guts, since they no longer have a convenient shell for that purpose. Because the slug’s foot contains the guts, it is no longer as nimble as the foot of a snail.

The transition from snails (with external shells) to slugs (with internal or no shells) goes through an intermediate stage called a semi-slug, in which the animal has an external shell too small to accommodate the body. The guts are partly in the shell and partly in a hump on the semi-slug’s back. In the semi-slug form, the foot is still strong, nimble, and muscular. Many semi-slugs persist around the world today; in the United States, we have one species in the Smokey Mountains and several species in the Pacific Northwest.

Semi-slug with its body twisted as it thrashes its tail. — Figure 1. *Hemphillia* semi-slug thrashing its tail so the body flops about (photo: T.A. Pearce).

Semi-slug crawling across a piece of wood. — Figure 2. *Hemphillia* semi-slug crawling in typical slug-like motion (photo: T.A. Pearce).

The semi-slugs in the Pacific Northwest, in the genus Hemphillia, are commonly known as jumping slugs, although they are not commonly seen. The yellowish shell is visible through a slit in the mantle, and the internal organs are contained in a hump on the back. When I have found them, sometimes they will thrash the tail from side to side or twist it into a corkscrew shape and flop about like a fish out of water (Figure 1). In my experience, the Hemphillia slugs will “jump” for a second or two, then they crawl away at a normal slug’s pace (i.e., sluggishly) (Figure 2).

When I was in Madagascar (off the east coast of Africa), I saw a semi-slug of an unknown species on a leaf about a meter above the ground. When I reached to grab the semi-slug, it vigorously thrashed its tail, propelling itself off the leaf and safely into the vegetation below, not to be found.

A jumping snail (Ovachlamys fulgens) originally from southern Japan, arrived in North America in the past few years.The jumping snail sustains its vigorous jumping for a longer period of time than do the Hemphillia jumping slugs I saw in Washington State, and it covers more ground with its antics. See a video of the snail jumping here.

Why do they jump? First, let me say “why” questions are some of the hardest to answer in science. Science can never prove something to be true, we can only prove some things to be false (falsifying). To answer “why,” we try to think of all the possible answers, then set about testing each one, falsifying as many as we can. The remaining possibility (or possibilities) is our best guess at the truth, but we don’t know for sure because we are not guaranteed to have thought of all the possibilities.

The answer to why they jump has not yet been thoroughly studied, but people have speculated. The most common thought is that the slugs and snails likely jump to startle predators. A hungry predator that saw a tasty morsel flopping about might want it for lunch, but when the gastropod stops flopping, the predator might not be able to find it (and meanwhile the slug or snail surreptitiously crawls away). The jumping snails in the video jumped in response to prodding, and the semi-slug on a leaf evaded my grasp by jumping; both consistent with the idea that jumping could be an adaptation against predation.

Why don’t more snails jump? There are way more species of snails than semi-slugs, and although some semi-slugs jump, I am aware of only one snail that jumps. Jumping is therefore more common in semi-slugs than in snails. If jumping is an anti-predator adaptation, and given that the reduced shells of semi-slugs offer less protection from predators, I speculate that semi-slugs benefit from an additional anti-predator strategy.

Here is another mystery that I believe has not been studied: how can these gastropods jump If their mucus sticks them to the substrate? Snails and slugs are famous for their tenacious slime, by which they stick so firmly that they can crawl upside down on the undersides of objects. The answer might be that the jumping species have less slimy mucus, but I suspect that the answer involves variability in the mucus itself. Mucus changes its stickiness depending on how much pressure is applied. That is how snails can move (when they are stuck to the surface). My guess is that the jumping species can rapidly reduce the stickiness of their mucus when it is time to jump.

After the past year, when time sometimes seemed to crawl slowly by, it seems appropriate to write about leaping slugs and snails. And here is a bonus joke:

A jumping slug could jump higher than the Empire State Building.

That’s because the Empire State Building can’t jump.

Tim Pearce is the head of the mollusks section at Carnegie Museum of Natural History. Museum employees are encouraged to blog about their unique experiences and knowledge gained from working at the museum.

Can’t Touch This

by Andrea Kautz

From the name of them, you may guess “blister beetles” are insects you might not want to handle. However, they sure are beautiful to look at! We’ve been noticing blister beetles out and about at Powdermill over the last week or so. Some fly around clumsily, while other flightless species scurry among the leaf litter. Beetles in this family (Meloidae) secrete a defensive substance called cantharidin, a skin irritant that can cause blistering. They are also very toxic when consumed, and can be fatal for livestock if present in the hay supply.

Shiny blue blister beetle on a rock. — Two different genera of blister beetles that are common in SW Pennsylvania: *Lytta* (top) and *Meloe* (bottom). Top image credit: Shaun Pogacnik. Bottom image credit: Christian Grenier.

Blister beetles are parasites, mostly in the nests of ground-nesting bees and wasps. Watch this short video clip to learn more about their life cycle. Spoiler alert: In this species, the newly hatched beetle larvae clump together and attract a male bee using a fragrance, and then transfer to the female he mates with, ultimately gaining access to her nest, where they feed on both the pollen provisions and the bee larvae themselves!

Whether larvae or adults, these striking beetles certainly have a fascinating dark side. There is always more than meets the eye when it comes to entomology!

Andrea Kautz is a Research Entomologist at Carnegie Museum of Natural History’s Powdermill Nature Reserve. Museum employees are encouraged to blog about their unique experiences and knowledge gained from working at the museum.

Reading Results: CNC Final Phase

by Patrick McShea

Whether you participated in the recent City Nature Challenge (CNC) or not, the results of the Pittsburgh Region’s broadest annual citizen science biological survey might be of interest.

The visually rich and geographically referenced compilation is a record of 1,219 different species of free-living plants, animals, and fungi documented, via the iNaturalist phone app, by 446 observers within six southwestern Pennsylvania counties during four mid-spring days. It’s a site where anyone with an interest in local natural history can spend a lot of time exploring.

Participation in Pittsburgh’s 2021 CNC was 16% lower than during the 2020 event, a reduction resulting in a similar-sized decline in total observations, yet only a 10% drop in the total number of different organisms documented. This year’s event was held April 30 – May 3, nearly a full week later in the spring than the 2020 CNC, a modification that might have increased the likelihood for some organisms to be observed.

A flowering garlic mustard plant growing at the base of a black walnut tree.

Garlic mustard (Alliaria petiolata), a highly invasive plant introduced to North America in the mid-1800s for its herbal value and erosion control properties, was the most commonly documented organism, accounting for 98 of the Pittsburgh Region’s 7,045 total observations. On the results page, where visitors can further explore every documented species, there’s information to be gleaned beyond the common and scientific names of each entry. Far down the rankings, for example, all four images of organ-pipe mud-dauber nest chambers show the wasp-build tubes attached to human-built walls, and both seal salamander images appear to be illuminated by flashlight or headlamp.

Tubular nests built by the organ pipe mud dauber, a wasp species that preys upon spiders.

As a category, plants, and frequently their blossoms, account for over half the total species documented. Birds, which included some migrants passing through the Pittsburgh region, led the vertebrate class with 111 species documented. Mammals followed with 21 documented species, and documented species for amphibians and reptiles numbered 16 and 13, respectively. 197 species of insects were documented, as were 137 species of fungi.

Participation levels are also carefully recorded in the results, with CMNH’s own Mason Heberling, Assistant Curator of Botany, leading the pack with 403 recorded observations of 208 different species. He explains his level of activity as a response to the scientifically sound parameters established by the CNC organizers. “Because it is roughly the same time each year, I have made a habit of going back to the same several sites each year, mostly ones that are convenient and nearby to me, and ironically, ones I don’t often get to as much as I wish I could. I do that with hopes of after going back to the same handful of sites around the same time, year after year, we can look at year-to-year and longer-term differences.”

And CMNH’s own Bonnie Isaac, Collection Manager in Botany, was among 397 identifiers who contributed time and background knowledge during a critical six-day second phase of the CNC to review and identify the observations of other participants. In fact, Bonnie identified 872 observations during the challenge. Within the operations of the iNaturalist app, observations with GPS coordinates that are identified by two separate reviewers are termed “Research Grade,” meaning they can contribute to the data sets of future studies. Nearly 54% of the Pittsburgh Region’s CNC observations earned the research grade mark this year, a very slight increase over last year’s mark.

Through the CNC and other citizen science survey projects, the contributions of observers and identifiers enables the powerful image recognition software of the iNaturalist platform to increasingly transform our phones into broad spectrum field guides. As you scroll and click through this year’s CNC results it’s also worth reflecting upon what is both gained and lost through a digital interface.

In a 2015 New York Times essay titled Identification Please, naturalist Helen Macdonald pays homage to the low-tech field guide by first calling out their flaws:

Out in the field, birds and insects are often seen briefly, at a distance, in low light or half-obscured by foliage; they do not resemble the tabular arrangements of paintings in guides, where similar species are brought together on a plain background on the same page, all facing one way and bathed in bright, shadowless light so they may be easily compared.

She later explains the great value of field guides in preparing our eyes and minds for what we hope to observe:

Field guides made possible the joy of encountering a thing I already knew but had never seen before.

Patrick McShea works in the Education and Visitor Experience department of Carnegie Museum of Natural History. Museum employees are encouraged to blog about their unique experiences and knowledge gained from working at the museum.

New Anthropocene Publication: Stemming the Tide

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Student of the World; Part 2: Stearns and Bayet

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Collected on this Day in 1982: One specimen isn’t always enough!

Archiving biological variation.

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Leaping Slugs! Did that Slug Just Jump?

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Can’t Touch This

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Reading Results: CNC Final Phase

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