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= Marilyn Fogel =

Marilyn Fogel (b. September 19, 1952) is an American geo-ecologist, currently residing as a Professor of Geo-ecology at UC Riverside in Riverside, California. She is known for her work with stable isotope geochemistry, studying ancient climate, animal behavior, ecology, and astrobiology. Fogel has also served in many leadership roles, including Program Director at the National Science Foundation in geobiology and low-temperature geochemistry.

Despite her initial vocation tests telling her that she should become a nun, sewing machine operator, or religious trainer, Fogel decided that she wanted to become a biogeochemist. She went on to hold many groundbreaking positions as a woman: she was the second female member of the Geophysical Laboratory and the first woman recipient of the Alfred Treibs Medal from the Geochemical Society for her work in organic geochemistry.

Early Life
Born on September 19, 1952 in Moorestown, New Jersey, Fogel knew that she wanted to go into sciences from a young age. She began by creating microcosms for tadpoles, fish, and insects, and kept a journal of the weather. In high school, she found herself enjoying biology and chemistry courses, and was inspired by Mr. Boehmler, her chemistry teacher, to pursue science. In 1970 she enrolled at Penn State, where she majored in biology. Early in her time there, Fogel took a vocational test which told her that she should become a nun, sewing machine operator, or religious trainer, but she initially thought she would go on to become a psychiatrist. The biology major allowed her to take many electives, where she discovered that she enjoyed environmental science courses. While taking bowling as a PE credit, Fogel found Peter H Given, an organic geochemist who focused on coal science, and worked with him part time. Her work with Given caused her to miss bowling once a week, and so she received a B in bowling. But, the research helped her decide that she wanted to be a biogeochemist. Fogel graduated from Penn State in 1973 with a BS in biology with honors. Her research mentor, Given, helped her apply to UT-Austin for graduate school. She decided to take a gap year before starting grad school to travel Europe and start a jewelry business making pins.

Academic Career
At UT-Austin, Fogel worked with Drs. Chase Van Baalen, Patrick Parker, and F. Robert Tabita on her dissertation, titled “Carbon isotope fractionation by ribulose 1,5-biphosphate carboxylase from various organisms”. While in graduate school, she owned an ice cream truck to help cover expenses. She graduated in 1977 with a PhD in Botany and Marine Sciences, before continuing on to a postdoc at the Geophysical Lab at the Carnegie Institute Washington from 1977-1979 under Dr. Thomas C. Hoering.

Following her postdoc position, Fogel became a staff member at the Geophysical Lab in 1979 working in biogeochemistry, where she remained until 2012. She was only the second female staff member at the Geophysical Lab. While there, Fogel became a visiting scientist at Carnegie's Department of Plant Biology (1985-1986), a visiting professor at the Department of Earth Sciences at Dartmouth College (1995), a visiting professor at the Department of Geology at the University of Maryland (2003-2005), and a Smithsonian Environmental Research Center Fellow (2003-2009).

In 2012, she made the move from Carnegie in Washington DC to UC Merced in Merced, California to become a Professor in the School of Natural Sciences as well as the Chair of the Life and Environmental Sciences Unit. There, she taught courses on the fundamentals of ecology, biogeochemistry, stable isotope ecology, field ecology, and the anthropocene.

In 2016, she moved to UC Riverside in Riverside, California, where she now resides as a Professor of Geo-ecology in the Earth and Environmental Sciences Department, and the Director of the EDGE (Environmental Dynamics & Geo-Ecology) Institute. Her research focuses on geo-ecology.

Research
Stable isotope ratios vary as a result of many biological and abiotic processes in the environment, changing over time, location, organism, and environment. The field of isotope geochemistry largely relies upon these natural variations, and can be incorporated into biological, ecological, chemical, and geological studies. Using isotope ratios, often 2H/1H, 𝛿13C, the 15N/14N ratio, and 18O/16O, Fogel has studied modern and ancient ecosystems, and has begun to apply the same techniques to study extraterrestrial material in martian meteorites, helping to advance the field of astrobiology.

Paleo-ecology and Climate Change
Fogel uses isotope ratios in ancient sediments and fossils to trace climate, diet, and species presence over time. In one study, she and collaborators used Genyornis newtoni eggshells in Australia ranging from 100,000 to 50,000 years of age to show that their extinction 50,000 years ago was likely due to human impact rather than climate changes. 40,000 years ago, Australia went through a dry period, as recorded in emu eggshells, but the extinction of Genyornis 50,000 years ago rather than 40,000 suggests that their extinction was likely unrelated to the drying. Using stable carbon isotopes, her group determined that Genyornis consumed nearly exclusively C3 plants, and that their cranial morphology indicated a browser reliant upon shrubland. Because it seems that the Genyornis diet is fairly restrictive, it is likely that the arrival of humans around 55,000 years ago and their burning of land may have caused some megafauna extinction as it changed the flora population. She has used similar techniques to study amino acids in the elephant birds of Madagascar and measure the isotope ratios in modern ostrich eggshells as a calibration tool for paleoenvironmental studies of Africa. Isotope ratios can also indicate species and diet characteristics in fossilized specimens. A Paleozoic fossil of Prototaxites has attracted attention dating back to 1859 due to its odd tree-like trunk measuring up to 8m long. Because the Paleozoic Era was one of drastic organismal shift, and the origin of vascular plants, it was previously unclear if Prototaxites were vascular plants or fungal species. However, a team of researchers, including Fogel, found the 𝛿13C of the species to be as much as 13‰ different from contemporaneous vascular plants, suggesting that Prototaxites are in fact heterotrophs, and more likely a fungus.

Using carbon isotope ratios in prehistoric human bone collagen, Fogel was able to study the diet of ancient humans. North American humans were either primarily maize eaters, which is a C4 plant, or primarily hunter-gatherers, which contains more C3 plants. Using this knowledge, Fogel measured the 𝛿13C values of essential amino acids to indicate whether the ancient human populations consumed primarily maize or were hunter-gatherers. Similarly, she was able to measure the marine nitrogen presence in human skeletons on Easter Island to establish that they consumed large amounts of marine food, and used the 15N enrichment in infants to determine the length of nursing in prehistoric populations.

Modern Ecosystems
Isotopic ratios are often used to trace the flow of certain elements through environmental systems. "Tagging" a molecule with an unusual isotope can allow a researcher to study a specific molecule and follow it in ecosystems, a technique known as using environmental tracers. Beyond human tagged compounds, natural isotope abnormalities occur as a result of various biotic and abiotic processes, and can often be found to vary across regions and species. Fogel has used these variations as natural ways to track animal movements, diets, and environmental shifts, and has also investigated the specific mechanisms that lead to environmental isotope fractionation.

As an example of a biotic fractionation event, respiration has led to an enrichment of 18O in the atmosphere relative to 16O. The isotopic ratio of 18O/16O is +23.5‰ relative to V-SMOW, and this ratio should also be observed in oxygen's consumption ratios. In one of the first major studies of plant oxygen consumption and fractionation, Guy, Fogel, and Berry defined the oxygen fractionation effects of various plant functions. They found that plants do not fraction oxygen isotopes in the photolysis of water in spinach thylakoids, but that they did discriminate against 18O during oxygen uptake by 21.3‰ during for the oxygenation of Rubisco in spinach and by 22.7‰ during the photorespiration of phosphoglycate by glycate oxidase. The fractionation during oxygen uptake in these two processes contribute strongly to the undefined18O/16O of the atmosphere, which is about 1.0235 times that of seawater. When it comes to tracing isotopes through the ecosystems, carbon-13 is often used. However, because plants contain such a large portion of the biomass, this tracer relies upon the assumption that the various components of plant tissues all contain the same isotopic ratios. Benner, Fogel, and Hodson proved that this isn't the case. Lignin, the main structural polymer in plants, was found to be depleted in 13C by 2-6‰ relative to the whole plant, and by 4-7‰ relative to the cellulose in saltwater cordgrass. This discovery suggests that, when using isotope tracers in the environment, it's important to compare similar types of molecules. Animal migration patterns can be traced as the isotope ratios fluctuate depending on their location to match their intake. Fogel has used carbon, nitrogen, and strontium isotope ratios to study African elephant diet and habitat use in the Amboseli Park in Kenya. Carbon isotope ratios vary by plant type, and so a change in carbon ratio of an elephant can indicate a shift in diet from trees to grasses. Strontium isotope ratios are reflected in the geologic age of bedrock, and so can be used as a tracer of the concentration of elephants within the park. In Great Gray Owls, migration is thought to cause a large amount of nutritional stress. Tracing the 15N/14N and 𝛿13C ratios in the birds' muscle tissues along with the contents of the birds' stomachs showed that nutritionally stressed owls were too weak to hunt, and at the brink of irreversible starvation as a result of their migration. Stable isotope ratios can also reveal diet specialization and shifts as specific carbon and nitrogen ratios are often indicative of groups of organisms. Using these ratios, Fogel has worked on diet studies on California sea otters, butterflies , blue crabs , killer whales , San Joaquin kit foxes , and bald eagles.

These same techniques of isotope fractionation investigations have also been used to study human environmental impacts. Because organic sewage outflow is enriched in 15N, she and her collaborators have been able to study the impacts of human sewage on coral reef systems by drawing a correlation between between the 15N/14N ratio and the percentage of diseased coral species, as well as the impacts of chicken houses on nearby ecosystems.

Astrobiology
As a Team Member of the NASA Astrobiology Institute from 1998-2010, Fogel worked on the Arctic Mars Analog Svalbard Expedition team in addition to her own collaborative research. One such project focused upon organic matter in carbonaceous chondrite meteorites where they measured the amino acid presence in three meteorites. First, to make sure that the amino acids were extraterrestrial in origin, they measured the 𝛿13C values of the amino acids in the meteorites, which turned out to be significantly higher than the  𝛿13C value of amino acids on Earth, confirming that they were not contamination from Earth (+31.6‰ to +50.5‰ in the meteorites relative to -70‰ to 11.25‰ present on Earth). The team of researchers also found that two of the meteorites had the highest ever detected amino acid abundances, which may be because carbonaceous chondrites are the most primitive and least altered meteorites. Two of the meteorites also had a similar carbon isotope value to a meteorite measured previously, which may indicate a reservoir of the amino acids in the interstellar medium.

In 2012, Steele et al. announced that ten out of the eleven measured martian meteorites contained abiotic macromolecular organic carbon in high-temperature forming minerals (igneous rocks). Organic carbon presence inside of high-temperature forming minerals indicates that the martian magmas precipitated reduced carbon species during crystallization. These results supported an idea initially postulated by Hirshmann and Withers that the martian atmosphere was formed from a reduced mantle. The reducing conditions indicated by the meterotic carbon content tentatively supports abiotic production of methane on Mars.

Academic Service and Honors
In 2012, Marilyn Fogel was elected as a Fellow to the American Association for the Advancement of Science and given the Sigma Xi Distinguished Scientist Award from the UC Merced Chapter. Also in 2013, she was awarded the Alfred Treibs Medal in the Organic Geochemistry Division from the Geochemical Society, which recognizes major achievements over a career in organic geochemistry, named for Alfred. E. Treibs, the founder of organic geochemistry. She was the first woman to win this prize. From 2015-2016, Fogel served as the President to the Biogeosciences Section of the American Geophysical Union, and became the Wilbur W. Mayhew Endowed Professor of Geo-Ecology at UC Riverside in 2016. Fogel served on numerous committees, including the Scientific Advisory Committee for the Jug Bay Wetlands Sanctuary from 1992-2005, the Committee on Origin and Evolution of Life for the Space Studies Board, National Research Council 2000-2002 , the Advisory Committee for the Carnegie Institution Department of Global Ecology from 2003-2005, and the AGU Biogeosciences Fellows Selection Committee in 2013 and 2014. In 2003, she was elected a Fellow of the Geochemical Society and European Association of Geochemistry. She was a Fulbright Scholar to Norway in 2006, and awarded the Jubilee Medal of the Geological Society of South Africa in 2006. She served as the National Science Foundation Director of Geobiology and Low Temperature Geochemistry from 2009 to 2010. She has also received numerous fellowships including a Loeb Fellowship from 1999 to 2001, and a Mellon Fellowship from 2001 to 2003 from the Smithsonian Environmental Research Center.

As a part of the NASA Astrobiology Institute from 1998 to 2010, she served on the Management Team (2004 to 2008) and then the Chief Scientist (2008) of the Arctic Mars Analog Svalbard Expedition (AMASE).

Legacy
In June of 2016, Marilyn Fogel and her husband, Christopher Swarth, created the Marilyn Fogel Endowment Fund for Internships, which is geared towards providing support for young scientists to experience research for the first time. This endowment will allow high school and undergraduate students to conduct mentored internships at Carnegie’s Geophysical Lab, where she worked for thirty three years, and the Department of Terrestrial Magnetism in Washington DC.

Dr. Fogel has also mentored numerous graduate students, postdocs, and research associates.

Her postdocs include: Stephen Macko from 1980 to 1982 (he is now a Professor at the University of Virginia), Luis Cifuentes from 1987-1990 (currently the Vice President for Research, Commercialization, and Outreach at the Texas A&M University) , David Velinsky from 1988 to 1991 (currently the Department Head of Biodiversity, Earth & Environmental Science at Drexel University) , Paul Kock from 1989 to 1993 (currently the Dean of Earth and Environmental Science at UC Santa Cruz) , Gray Bebout from 1989 to 1992 (currently a Professor at Lehigh University) , Carmen Aguilar from 1992 to 1995 (currently an Associate Scientist at the University of Wisonsin-Milwaukee) , Beverly Johnson from 1995 to 1996 (currently a Professor at Bates College) , Mark A. Teece from 1995 to 1999 (currently an Associate Professor at SUNY-Syracuse) , Jay Brandes from 1996 to 1998 (currently an Associate Professor at the Skidaway Institute of Oceanography) , Susan E. Ziegler from 1998 to 1999 (currently the Canada Research Chair in Environmental Science at the Memorial University of Newfoundland) , Albert Colman from 2002 to 2004 (current an Assistant Professor at the University of Chicago) , Matthew McCarthy from 2000 to 2001 (current a Professor at UC Santa Cruz) , Diane O'Brien from 2000 to 2002 (currently a Professor at the University of Alaska-Fairbanks) , Matthew Wooller from 2000 to 2002 (currently a Professor at the University of Alaska-Fairbanks and the Director of the Alaska Stable Isotope Facility ), Timothy Filley from 2000 to 2002 (currently a Professor at Purdue University) , Shuhei Ono from 2003 to 2007 (currently an Associate Professor at MIT) , Jennifer Eigenbrode from 2004 to 2006 (currently a Space Scientist at Goddard Space Flight Center) , Penny Morrill from 2005 to 2007 (currently an Assistant Professor at the Memorial University of Newfoundland) , Seth Newsome from 2006 to 2009 (currently an Assistant Professor at the University of New Mexico) , and David Baker from 2010 to 2013 (currently an Assistant Professor at the University of Hong Kong).

As for graduate students, Fogel was on the Ph.D. committee for Kevin Mandernack at the Scripps Institution of Oceanography from 1988 to 1993. He studied oxygen isotope fractionation during manganese oxide mineral formation by bacteria and non-biological processes, and is currently the Chair of the Earth Sciences division at Indiana University-Purude University Indianapolis. In 1992, she was on the Ph.D. committee for Herve Bocherens from the University of Paris, as he worked on carbon and nitrogen isotope tracers of fossil human animals from Europe. He is currently currently a Professor at the University of Tübingen. From 1997 to 1998, she advised Matthew Fantle from Dartmouth College on his study of isotope fractionation in blue crabs. He is currently an Associate Professor at Penn State. She advised Kevin Boyce from Harvard University from 1999 to 2000 in his study of the paleobiology of early land plants. He is currently an Associate Professor at Stanford University. From 2007 to 2010, she served on the PhD committee for Kelton McMahon and his studies of compound specific isotope analysis of amino acids in fish otoliths. He is currently an Assistant Researcher at UC Santa Cruz. She hosted Ana Laura Liberoff, a PhD visiting student from the Centro Nacional Patagonico in Argentina. She pursued trophis studies of trout in Argentinian rivers, and is continuing her PhD. From 2010 to 2013, Fogel mentored Derek Smith from Dartmouth College. He studied the geomicrobiology of purple sulfur bacteria, and is currently a postdoc at the Washington University in St. Louis.

Current Life
Marilyn Fogel currently resides in Riverside, California with her husband, Christopher Wood Swarth. She has two children: Dana Antoinette Swarth, a teacher and a farmer living in Mariposa, California, and Evan Alexander Swarth, an AIDS/HIV researcher at the Tony Mills Clinic in Los Angeles.