Photo Gallery: The Drifting World

Plankton are the sea stuff that we do not eat and cannot see. They are, by definition, not swimmers but drifters; any creature that cannot propel itself against the current is a plankter (that’s the singular). Their tiny cosmos contains multitudes—an estimated million and a half species, including plants and animals, bacteria and viruses, fish larvae and microalgae, predators, parasites, and prey.

Small crustaceans and larvae collected from South Carolina salt marshes in the summer. PHOTOGRAPH BY CHRISTIAN SARDET
Small crustaceans and larvae collected from South Carolina salt marshes in the summer.
PHOTOGRAPH BY CHRISTIAN SARDET

Writing in 1951, in “The Log from the Sea of Cortez,” John Steinbeck proposed that “the disappearance of plankton, although the components are microscopic, would probably in a short time eliminate every living thing in the sea and change the whole of man’s life.” This is quite possibly an understatement. Plankton are at the center of the marine food web, produce at least half of the oxygen in Earth’s atmosphere, and absorb enough carbon dioxide each year to counteract half of humankind’s fossil-fuel emissions. Altogether, they make up ninety-eight per cent of the oceans’ biomass, more than every whale, shark, herring, starfish, and lobster combined. Still, until very recently, our knowledge of the planktic realm remained limited.

A young ctenophore prepares to swallow a diatom. Toba Bay, Japan. PHOTOGRAPH BY CHRISTIAN SARDET
A young ctenophore prepares to swallow a diatom. Toba Bay, Japan.
PHOTOGRAPH BY CHRISTIAN SARDET

Christian Sardet moved to Villefranche-sur-Mer, a seaside town between Nice and Monaco, in the nineteen-seventies, to take a job with the French Atomic Energy Commission. The bay there, notable for both its depth and its profusion of plankton, soon turned him into a confirmed planktologist. Decades after his conversion, in 2009, he spearheaded a two-and-a-half-year, seventy-thousand-mile voyage around the world, surveying plankton from the decks of a schooner called the Tara.

Dinoflagellates in their dormant phase, protected by oblong shells. PHOTOGRAPH COURTESY THE MEDITERRANEAN CULTURE COLLECTION OF VILLEFRANCHE-SUR-MER
Dinoflagellates in their dormant phase, protected by oblong shells.
PHOTOGRAPH COURTESY THE MEDITERRANEAN CULTURE COLLECTION OF VILLEFRANCHE-SUR-MER
A group of radiolarians from the bay of Villefranche-sur-Mer. The smaller organisms are about one millimetre across. On the bottom left, a spumellarian radiolarian, which consists of many cells in a single gelatinous envelope.
A group of radiolarians from the bay of Villefranche-sur-Mer. The smaller organisms are about one millimetre across. On the bottom left, a Spumellarian radiolarian, which consists of many cells in a single gelatinous envelope.

Other such projects had focussed solely on microscopic ocean life, but Sardet and his colleagues took a more holistic approach. They collected thirty-five thousand samples, encompassing the entire range of drifters, from millimetre-long zoöplankton to the longest organisms on Earth, the siphonophores, whose most famous member is the Portuguese man-o’-war.

A cluster of phaeodarians stuck together by their spines, Villefranche-sur-Mer. PHOTOGRAPH BY CHRISTIAN SARDET AND ULYSSE SARDET
A cluster of phaeodarians stuck together by their spines, Villefranche-sur-Mer.
PHOTOGRAPH BY CHRISTIAN SARDET AND ULYSSE SARDET
A female of the species Pelagia noctiluca, whose name means “night light,” after its ability to bioluminesce. The jellyfish can move vertically by pulsating, but because it cannot swim horizontally it is classified as plankton. PHOTOGRAPH BY REBECCA HELM
A female of the species Pelagia noctiluca, whose name means “night light,” after its ability to bioluminesce. The jellyfish can move vertically by pulsating, but because it cannot swim horizontally it is classified as plankton.
PHOTOGRAPH BY REBECCA HELM

Last week, a series of five papers on the Tara’s findings, the first to use its data, appeared in the journal Science. (Topics included plankton distribution, planktic viruses, and interspecies interactions in the global planktome.) Next month, the University of Chicago Press will publish “Plankton: Wonders of the Drifting World,” a compendium of Sardet’s photographs from the expedition. Filled with more than five hundred close-ups of jewel-like diatoms and gelatinous comb jellies, each accompanied by a condensed history and biography, the book is a long overdue introduction to the oceans’ ninety-eight per cent.

A jellyfish of the species Oceania armata. PHOTOGRAPH BY CHRISTIAN SARDET
A jellyfish of the species Oceania armata.
PHOTOGRAPH BY CHRISTIAN SARDET
Small crustaceans in their larval stages. Clockwise from top left: two shrimp, two fiddler crabs, two sea spiders, and a decapod. PHOTOGRAPH BY CHRISTIAN SARDET
Small crustaceans in their larval stages. Clockwise from top left: two shrimp, two fiddler crabs, two sea spiders, and a decapod.
PHOTOGRAPH BY CHRISTIAN SARDET
A shrimp larva seen from below. PHOTOGRAPH BY CHRISTIAN SARDET
A shrimp larva seen from below.
PHOTOGRAPH BY CHRISTIAN SARDET
An amphipod mother incubates her embryos. PHOTOGRAPH BY NOÉ SARDET
An amphipod mother incubates her embryos.
PHOTOGRAPH BY NOÉ SARDET
A juvenile nudibranch—more commonly known as a sea slug—of the genus Flabellina. PHOTOGRAPH BY CHRISTIAN SARDET
A juvenile nudibranch—more commonly known as a sea slug—of the genus Flabellina.
PHOTOGRAPH BY CHRISTIAN SARDET

Nicola Twilley is the author of the blog Edible Geography, a co-host of the Gastropod podcast, and a contributing writer at newyorker.com.

Microscopic sea creatures hold clues to our evolutionThese mesmerizing microscopic sea creatures produce half the world’s oxygen and may hold clues to the evolution of life.

Posted by Quartz on Thursday, May 21, 2015

 

Photo: A selection of plankton collected in the spring from aboard the Tara. The largest organisms, which are jellyfish, measure about five millimetres across.
CREDITPHOTOGRAPH BY CHRISTIAN SARDET

View original article at: The Drifting World

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