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The shelled sea butterfly Hyalocylis striata can be found in the warm surface waters of the ocean around the world. Photo: © Karen Osborn

The chemistry of the ocean is changing. Most climate change discussion focuses on the warmth of the air, but around one-quarter of the carbon dioxide we release into the atmosphere dissolves into the ocean. Dissolved carbon dioxide makes seawater more acidic—a process called ocean acidification—and its effects have already been observed: the shells of sea butterflies, also known as pteropods, have begun dissolving in the Antarctic.

Tiny sea butterflies are related to snails, but use their muscular foot to swim in the water instead of creep along a surface. Many species have thin, hard shells made of calcium carbonate that are especially sensitive to changes in the ocean’s acidity. Their sensitivity and cosmopolitan nature make them an alluring study group for scientists who want to better understand how acidification will affect ocean organisms. But some pteropod species are proving to do just fine in more acidic water, while others have shells that dissolve quickly. So why do some species perish while others thrive?

It’s a hard question to answer when scientists can hardly tell pteropod species apart in the first place. The cone-shaped pteropod shown here is in a group of shelled sea butterflies called thecosomes, from the Greek for “encased body.” There are two other groups: the pseudothecosomes have gelatinous shells, and the gymnosomes (“naked body”) have none at all. Within these groups it can be hard to tell who’s who, especially when relying on looks alone. Scientists at the Smithsonian’s National Museum of Natural History are using genetics to uncover the differences among the species.

This effort is led by zoologist Karen Osborn, who has a real knack for photography: in college, she struggled over whether to major in art or science. After collecting living animals while SCUBA diving in the open ocean, she brings them back to the research ship and photographs each in a shallow tank of clear water with a Canon 5D camera with a 65mm lens, using three to four flashes to capture the colors of the mostly-transparent critters. The photographs have scientific use—to capture never-before-recorded images of the living animals—and to “inspire interest in these weird, wild animals,” she said. All of these photos were taken in the Pacific Ocean off the coasts of Mexico and California.

This gymnosome (Pneumodermopsis sp.) pulls shelled pteropods from their shells with a set of suckers. Photo: © Karen Osborn

Although sea butterflies in the gymnosome group, like the one seen above, don’t have shells and are therefore not susceptible to the dangers of ocean acidification, their entire diet consists of shelled pteropods. If atmospheric CO₂ continues to rise due to the burning of fossil fuels and, in turn, the ocean becomes more acidic, their prey source may disappear—indirectly endangering these stunning predators and all the fish, squid and other animals that feed on the gymnosomes.

Cavolinia uncinata. Photo: © Karen Osborn

For years, sea butterflies were only collected by net. When collected this way, the animals (such as Cavolinia uncinata above) retract their fleshy “wings” and bodies into pencil eraser-sized shells, which often break in the process. Researchers then drop the collected pteropods into small jars of alcohol for preservation, which causes the soft parts to shrivel—leaving behind just the shell. Scientists try to sort the sea butterflies into species by comparing the shells alone, but without being able to see the whole animals, they may miss the full diversity of pteropods.

This may be the same species as the previous sea butterfly (Cavolinia uncinata), or it could be a different species that has gone unnoticed for decades. Photo: © Karen Osborn

More recently, scientists such as Osborn and Smithsonian researcher Stephanie Bush have begun collecting specimens by hand while SCUBA diving in the open sea. This blue-water diving allows her to collect and photograph fragile organisms. As she and her colleagues observe living organisms in more detail, they are realizing that animals they had thought were the same species, in fact, may not be! This shelled pteropod (Cavolinia uncinata) is considered the same species as the one in the previous photo. Because their fleshy parts look so different, however, Bush is analyzing each specimen’s genetic code to establish whether they really are the same species.

Mass of Cavolinia uncinata eggs. Photo: © Karen Osborn

This string of eggs shot out of Cavolinia uncinata when it was being observed under the microscope. The eggs are attached to one another in a gelatinous mass, and, had they not been self-contained in a petri dish, would have floated through the water until the new pteropods emerged as larvae. Their reproduction methods aren’t well studied, but we know that pteropods start off as males and once they reach a certain size switch over to females. This sexual system, known as sequential hermaphroditism, may boost reproduction because bigger females can produce more eggs.

In the Arctic, this pteropod species (Limacina helicina) can compose half of the zooplankton swimming in the water column. Photo: © Karen Osborn

This pteropod (Limacina helicina) has taken a beating from being pulled through a trawl net: you can see the broken edges of its shell. An abundant species with black flesh, each of these sea butterflies are the size of a large grain of sand. In certain conditions they “bloom” and, when fish eat too many, the pteropod’s black coloring stains the fishes’ guts black.

The shell of Clio recurva is a perfect landing strip for a colony of hydroids. Photo: © Karen Osborn

Not only is the inside of this shell home to a pteropod (Clio recurva), but the outside houses a colony of hydroids—the small pink flower-like animals connected by transparent tubing all over the shell. Hydroids, small, predatory animals related to jellyfish, need to attach to a surface in the middle of the ocean to build their colony, and the tiny shell of Clio is the perfect landing site. While it’s a nice habitat for the hydroids, this shell probably provides less than ideal protection for the pteropod: the opening is so large that a well equipped predator, such as larger shell-less pteropods, can likely just reach in and pull it out. “I would want a better house, personally,“ says Osborn.

It was once thought that Clione limacina was found in the Antarctic and Arctic, but it’s likely that they are two separate species. Photo: © Karen Osborn

Gymnosomes are pteropods that lack shells and have a diet almost entirely composed of shelled pteropods. This species (Clione limacina), exclusively feeds on Limacina helicina (the black-fleshed pteropod a few slides back). They grab their shelled relative with six tentacle-like arms, and then use grasping jaws to suck their meal out of the shell.

  This post was written by Emily Frost and Hannah Waters. Learn more about the ocean from the Smithsonian’s Ocean Portal.

Terminal Mirage 2, 2003. Credit: David Maisel/INSTITUTE

For almost 30 years, David Maisel has been photographing areas of environmental degradation. He hires a local pilot to take him up in a four-seater Cessna, a type of plane he likens to an old Volkswagen beetle with wings, and then, anywhere from 500 to 11,000 feet in altitude, he cues the pilot to bank the plane. With a window propped open, Maisel snaps photographs of the clear-cut forests, strip mines or evaporation ponds below.

American Mine (Carlin NV 2), 2007. Credit: David Maisel/INSTITUTE

The resulting images are beautiful and, at the same, absolutely unnerving. What exactly are those blood-red stains? As a nod to the confusing state they place viewers in, Maisel calls his photographs black maps, borrowing from a poem of the same title by contemporary American poet Mark Strand. “Nothing will tell you / where you are,” writes Strand. “Each moment is a place / you’ve never been.”

The Mining Project (Butte MT 3), 1989. Credit: David Maisel/INSTITUTE

Maisel’s latest book, Black Maps: American Landscape and the Apocalyptic Sublime, is a retrospective of his career. It features more than 100 photographs from seven aerial projects he has worked on since 1985. Maisel began with what Julian Cox, the founding curator of photography at the Fine Arts Museums of San Francisco, calls in the book an “extensive investigation” of Bingham Canyon outside of Salt Lake City, Utah. His photographs capture the dramatic layers, gouges and textures of the open-pit mine, which holds the distinction of being the largest in the world.

This series expanded to include other mining sites in Arizona, New Mexico, Nevada and Montana, until eventually Maisel made the leap from black and white to color photography, capturing the bright chemical hues of cyanide-leaching fields in The Mining Project (a selection shown above). He also turned his lens to log flows in Maine’s rivers and lakes in a project called The Forest and the dried bed of California’s Owens Lake, drained to supply Los Angeles with water, in The Lake Project.

Oblivion, as the photographer describes on his personal Web site, was a “coda” to The Lake Project; for this series of black and white photographs, reversed like x-rays, Maisel made the tight network of streets and highways in Los Angeles his subject—see an example below. Then, in one of his most recent aerial endeavors, titled Terminal Mirage (top), he photographed the Mondrian-like evaporation ponds around Utah’s Great Salt Lake.

Oblivion 2N, 2004. Credit: David Maisel/INSTITUTE

All combined, Maisel’s body of work is what Cox calls “a medley of terrains transformed by humankind to serve its needs and desires.” The narrative thread, he adds in the introduction to Black Maps, is the photographer’s aim to convey humans’ “uneasy and conflicted relationship with nature.”

I wrote about Maisel’s photography for Smithsonian in 2008, when his “Black Maps” exhibition was touring the country, and at that time, the Long Island, New York-native hedged from being called an “environmental activist.” As Cox astutely notes, “The photographs do not tell a happy story,” and yet they also “do not assign any blame.” Maisel is attracted to these landscapes because of their brilliant colors, eye-catching compositions and the way they emote both beauty and danger.

The Lake Project 20, 2002. Credit: David Maisel/INSTITUTE

Maisel’s photographs are disorienting; it is a mental exercise just trying to orient oneself within the frame. Without providing solid ground for viewers to stand on, the images inevitably spark more questions than they do answers.

Each one is like a Rorschach test, in that the subject is, to some extent, what viewers make it to be. Blood vessels. Polished marble. Stained-glass windows. What is it that you see?

An exhibition of Maisel’s large-scale photographs, Black Maps: American Landscape and the Apocalyptic Sublime, is on view at the CU Art Museum, University of Colorado Boulder, through May 11, 2013. From there, the show will travel to the Scottsdale Museum of Contemporary Art in Scottsdale, Arizona, where it will be on display from June 1 to September 1, 2013.

A difference of nearly four decades: at top, a ski area in Aspen, Colorado last year, captured by Ron Hoffman; at bottom, the same location in 1974, shot by Dustin Wesley. Credit: US EPA

In 1971, about 70 photographers, commissioned by the newly formed Environmental Protection Agency, set out to document the American landscape on just 40 rolls of film each. They trudged through coal mines and landfills, traversed deserts and farms and discovered big cities’ small corridors. The end result was DOCUMERICA, a collection of more than 15,000 shots capturing the country’s environmental problems—from water and air pollution to industrial health hazards—over six years.

Decades later, a new generation of photographers is collecting ”after” pictures. In the past two years, the EPA has collected more than 2,000 photos, all of which loosely depict the environment. The State of the Environment Photography Project, as the effort is called, asks photographers to take shots that match scenes from DOCUMERICA, to show how the landscape has changed since the 1970s. It also asks photographers to capture new or different environmental issues, with the idea that these modern scenes could in turn be re-photographed in the distant future; the EPA has released several of these shots for this year’s Earth Day. The project will accept submissions through the end of 2013.

The EPA explains that DOCUMERICA became a baseline for America’s environmental history, and that tracking change is key for public eco-consciousness.

Both images, taken by Michael Philip Manheim, show a section of East Boston in the 1970s and present day. Decades ago, rows of triple-deckers lined the streets of the neighborhood. Today, only one remains, the sole survivor of nearby airport expansion. Credit: Michael Philip Manheim/US EPA

There’s more to capturing environmental issues on camera than shooting smoke stacks and nuclear plants. The most effective way to convey them is to photograph people, says Michael Philip Manheim. Manheim, one of DOCUMERICA’s photographers, documented noise pollution in East Boston in the ’70s, portraying the deterioration of a close-knit community as nearby Logan Airport expanded its runways. That’s what made DOCUMERICA strike a chord with the public years ago, providing closeups of miners suffering from black lung and kids playing basketball in cramped housing developments.

“Meet the affected people, let them know how you care, find out what impacts them the most,” advises Manheim about matching his photos today. He still has the cameras he used for his assignment, which he treats as “sculptures” that stay hidden in closets. “After that, it’s time to energize a camera, and not by posing pictures but by reacting candidly to what is going on in the lives of your subjects.”

At left, DOCUMERICA photographer David Falconer’s shot of the Weyerhaeuser Paper Mills and Reynolds Metal Plant along the Columbia River in Washington State. At right, Craig Leaper’s re-creation. Credit: US EPA

Though some landscapes remain the same, Manheim says what’s changed since DOCUMERICA is the level of awareness of environmental issues. The photographer attributes this increase to the rapid spread of digital information, a visual online petition that he says Bostonians could have used to fight back in the 1970s.

At left, the Great Falls of Maine’s Androscoggin River, with the city of Lewiston in the background, captured by Charles Steinhacker in 1973. At right, a replication of the same scene by Munroe Graham. Credit: US EPA

The “now” and “then” photos show varying degrees of change when placed side-by-side, funky fashions and clunky cars aside. Clumps of unnatural foam continue to bob along polluted waters near industrial buildings, but considerably less smog hangs in the air of some urban cities. In an “after” shot of a section of John Day Dam between Oregon and Washington State, a set of wind turbines appear on the background terrain.

At left, the John Day Dam viewed from the Washington side of the Columbia River, photographed by David Falconer in 1973. At right, a similar view, including wind turbines along the ridge, taken by Scott Butner in 2012. Credit: US EPA

The ease of digital photography will help propel the current iteration of an environmental snapshot, Manheim says. When shooting on film, photographers can’t know right away whether they’ve taken “the shot.” Digital allows them to examine the first few shots of a scene, and then find better ways to convey its details.

“You don’t stand around, waiting for something to happen. You exert mental and physical energy,” Manheim says. For anyone wanting to participate in the State of the Environment project, the photographer has some advice: “Set the scene in your coverage, and then you go for the ‘good stuff.’ You get close, closer, closest. You move in to explore and find the epitomizing image, close and meaningful, that symbolizes the situation.”

In the 1970s, Manheim got to know the people who lived in the colorful triple-decker row houses lining Neptune Road in East Boston. Planes soared overhead nearly every three minutes, prompting the nearby residents to cover their ears from the deafening roar of the engines. He captured one of these low-flying planes in a photograph, shown above. In 2012, Manheim returned to the site to document it yet again. The “then” and “now” pairing tells a story that has played out over decades. Eventually, the adjacent airport built runways flush to the streets’ backyards and driveways, and today, only one home remains.

South Boston’s Moakley Park. At left, Ernst Halberstadt smog-heavy shot in 1973; at right, Roger Archibald’s 2012 take. Once a muralist for the Works Progress Administration (WPA), Halberstadt documented city life in Boston for DOCUMERICA. Credit: US EPA

ZnO Fall Flowers. Image by Audrey Forticaux, a graduate student in the Chemistry Department.

“The scientist does not study nature because it is useful; he studies it because he delights in it, and he delights in it because it is beautiful. If nature were not beautiful, it would not be worth knowing, and if nature were not worth knowing, life would not be worth living.”

—Jules Henri Poincare, a French mathematician (1854-1912)

Earlier this month, the University of Wisconsin-Madison announced the winners of its 2013 Cool Science Image contest. From an MRI of a monkey’s brain to the larva of a tropical caterpillar, a micrograph of the nerves in a zebrafish’s tail to another of the hairs on a leaf, this year’s crop is impressive—and one that certainly supports what Collage of Arts and Sciences believes at its very core. That is, that the boundary between art and science is often imperceptible.

Zebrafish neural network. Image by Pui-ying Lam, a graduate student studying cellular and molecular biology. A fluorescent molecule makes the neurons in the tail of a live zebrafish visible.

The Why Files, a weekly science news publication put out by the university, organizes the contest; it started three years ago as an offshoot of the Why Files’ popular “Cool Science Image” column. The competition rallies faculty, graduate and undergraduate students to submit the beautiful scientific imagery produced in their research.

Brain image. Image by Christopher Coe, a faculty member in the Psychology Department. This image of a monkey’s brain was created, thanks to an MRI technique called diffusion tensor imaging.

“The motivation was to provide a venue and greater exposure for some of the artful scientific imagery we encounter,” says Terry Devitt, the coordinator of the contest. “We see a lot of pictures that don’t get much traction beyond their scientific context and thought that was a shame, as the pictures are both beautiful and serve as an effective way to communicate science.”

Middle Earth. Image by Sheryl A. Rakowski, senior research specialist in the Bacteriology Department. Slime mold, which typically live as single-celled amoebae, create “flash mobs” when faced with a food shortage. These flash mobs meld into multicellular organisms.

Most of the time, these images are studied in a clinical context, Devitt explains. But, increasingly, museums, universities and photography contests are sharing them with the public. “There is an ongoing revolution in science imaging and there is the potential to see things that could never before be seen, let alone imaged in great detail,” says Devitt. “It is important that people have access to these pictures to learn more about science.”

Air Sea Interaction. Image by Rick Kohrs, senior instrument technician at the Space Science and Engineering Center. Superstorm Sandy is colliding with the East Coast of the United States in this image of water vapor and sea surface temperatures from October 28, 2012.

This year, the University of Wisconsin-Madison’s scientific community entered 104 photographs, micrographs, illustrations and videos to the Cool Science Image contest—a number that trumps last year’s participation by about 25 percent. The submissions are judged, quite fittingly, by a cross-disciplinary panel of eight scientists and artists. The ten winners receive small prizes (a $100 gift certificate to participating businesses in downtown Madison) and large format prints of their images.

Trichomes. Image by Emily Kief, undergraduate student, Botany Department. This scanning electron micrograph shows growths, or trichomes, on a leaf.

“When I see an image I love, I know the second I see it. I know it because it is beautiful,” says Ahna Skop, a judge and geneticist at the university. She admits she has a bias for images capturing nematode embryos and mitosis, her areas of expertise, but like many people, she also gravitates to images that remind her of something familiar. The scanning electron micrograph, shown at the top of this post, for example, depicts nanoflowers of zinc oxide. As the name “nanoflower” suggests, these chemical compounds form petals and flowers. Audrey Forticaux, a chemistry graduate student at UW-Madison, added artificial color to this black and white micrograph to highlight the rose-like shapes.

Hoodia. Image by Mo Fayyaz, distinguished faculty associate, Botany Department. A macroscopic view of the center of a hoodia flower—a succulent native to South Africa and Namibia.

Steve Ackerman, an atmospheric scientist at the university and a fellow judge, describes his approach: “I try to note my first response to the work—am I shocked, awed, baffled or annoyed?” He is bothered when he sees meteorological radar images that use the colors red and green to depict data, since they can be difficult for color blind people to read. “I jot down those first impressions and then try to figure out why I reacted that way,” he says.

Lunaria annua. Image by Kata Dosa, graduate student, Nelson Institute for Environmental Studies. The seeds of Lunaria annua can be seen through the plant’s translucent seed pods. In fact, you can even see the umbilical cord-like structure, called a funiculus, that connects the seed to the placenta.

After considering artistic qualities, and the gut reactions they trigger, the panel considers the technical elements of the entries, along with the science they convey. Skop looks for a certain crispness and clarity in winning images. The science at play within the frame also has to be unique, she says. If it is something that she has seen before, the image probably won’t pass muster.

Automeris banus. Image by Peggy Boone, graduate student, Zoology Department. This moth, in its larva form, stung Boone when she encountered it in Mexico’s Palenque National Park. Nonetheless, with a swollen hand, the field biologist managed to capture this photograph.

Skop hails from a family of artists. “My father was a sculptor and my mother a ceramicist and art teacher. All of my brothers and sisters are artists, yet I ended up a scientist,” she says. “I always tell people that genetically I’m an artist. But, there is no difference between the two.”

Beta catenin. Image by Vastal Mehta, research associate in the School of Veterinary Medicine’s Department of Comparative Biosciences. This micrograph shows a cluster of cells in a transgenic mouse, exhibiting high levels of beta catenin, a protein that plays a role in prostate development.

If anything, Skop adds, the winning entries in the Cool Science Image contest show that “nature is our art museum.”

Jupiter’s innermost large moon, Io, is extremely volcanic. “If you look closely on the upper left and upper right horizon, you can see eruptions in the process of happening,” says Benson. “We know that at least 400 volcanos are continuously blasting magma into space from Io.” Mosaic composite photograph. Galileo, July 3, 1999. Credit: NASA/JPL/University of Arizona/Michael Benson, Kinetikon Pictures.

At the outset of both his new book, Planetfall, and his exhibition of the same title now at the Washington, D.C. headquarters of the American Association for the Advancement of Science, photographer Michael Benson defines the word “planetfall.” Planetfall, he states, is “the act or an instance of sighting a planet after a space voyage.”

It is really the existence, in the last 50 years, of spacecraft orbiting the planets of our solar system that has necessitated the term. “Each of these far-flung machines is following the traditions blazed by the great Earthbound explorers, but when its destination comes into view, we can no longer call that dramatic moment ‘landfall,’” according to the exhibition. “Hence ‘planetfall’—the moment of arrival at other worlds.”

In his latest series of images, Benson attempts to lift us off terra firma and bring this awe-inspiring moment to us. His 40 large-scale photographs, hanging in the AAAS Art Gallery, are remarkably crisp views of the rings of Saturn, moons in transit, a sunset on Mars and volcanic eruptions on Jupiter’s moon, Io, among other marvels. Each image is in “true color,” as Benson puts it.

To make his photographs, Benson starts by perusing through thousands of raw image data collected on missions led by NASA—Cassini, Galileo, MESSENGER, Viking and Voyager, among others—and the European Space Agency. He has compared this process to panning for gold—the precious gold nuggets being beautiful sequences of images, rarely seen by the public, that he can piece together into one seamless photograph. It can take anywhere from tens to hundreds of raw frames to arrange, like a mosaic, one legible composite image. Then rendering the photograph in realistic colors adds another layer of complexity. Benson describes the process in his book:

“In order for a full-color image to be created, the spacecraft needs to have taken at minimum two, but preferably three, individual photographs of a given subject, with each exposed through a different filter…. Ideally, those filters are red, green, and blue, in which case a composite image color image can usually be created without too much trouble…. If a red and a blue filtered shot are available but not a green, for example, a synthetic green image can be created by mixing the other two colors.”

Uranus and its rings. Mosaic composite photograph. Voyager, January 24, 1986. Credit: NASA/JPL-Caltech/Michael Benson, Kinetikon Pictures.

Some of the colors are quite striking. Jupiter’s moon, Io, is a brilliant yellow, in one of Benson’s photographs (shown at top). To me, it looks like a shiny bowling ball, whereas for Benson it calls to mind the yellow rim of Morning Glory Pool in Yellowstone National Park. “It’s all sulphur,” he says. Then, there is the photographer’s very modernist-looking portrait of Uranus (above) and its rings in a stunning robin’s egg blue, assembled from raw images taken by the Voyager spacecraft as it flew by the planet on January 24, 1986. Uranus’ rotation axis is roughly parallel to the plane of the solar system, making its rings vertical in this view. ”This is about as close, I believe, to what the human eye would see as it is possible to produce using existing data,” Benson explains.

The sights take some time to digest. At a recent preview of the AAAS exhibition, I watched as onlookers approached the photographs, oriented themselves with their subjects and tried to make sense of the shadows, streaks and gouges they saw. As TIME reported on its blog, LightBox, “Benson’s visions demand more than a single look; the longer one spends with his vast landscapes, considering the scale and scope, the more they facilitate a state of meditation.”

Meditate on these selections from Planetfall, on display at the AAAS Art Gallery through June 28, 2013.

Saturn with Mimas. Mimas, one of Saturn’s moons, as seen against the shadows cast by the planet’s rings onto its northern hemisphere. Cassini, November 7, 2004. Credit: NASA/JPL-Caltech/Michael Benson, Kinetikon Pictures.

Saturn, Mimas and Tethys. Mosaic composite photograph. Cassini, July 16, 2005. Credit: NASA/JPL-Caltech/Michael Benson, Kinetikon Pictures.

Sun on the Pacific. The view seen from the International Space Station at an altitude of 235 miles. ISS 007 crew, July 21, 2003. Credit: NASA JSC/ISS 07 crew/Michael Benson, Kinetikon Pictures.

Transit of Io. The volcanic moon passes across the face of Jupiter. Mosaic composite photograph. Cassini, January 1, 2001. Credit: NASA/JPL-Caltech/Michael Benson, Kinetikon Pictures.

Eclipse of Sun by Earth. Ultraviolet exposure, Solar Dynamics Observatory, Apri 2, 2011. Credit: NASA GSFC/Michael Benson, Kinetikon Pictures.

Surface of Jupiter’s Moon Europa. Galileo, June 27, 1996. Credit: NASA/JPL/Michael Benson, Kinetikon Pictures.

Crescent Neptune and its largest satellite, Triton. Mosaic composite photograph. Voyager 2, August 31, 1989. Credit: NASA/JPL-Caltech/Michael Benson, Kinetikon Pictures.

Enceladus Vents Into Space. Saturn’s moon Enceladus geysers water into space from its south polar region. Mosaic composite photograph. Cassini, December 25, 2009. Credit: NASA/JPL-Caltech/Michael Benson, Kinetikon Pictures.