Water Whispering: Memoir of a Winter in the Lab

Posted on by Zoe Sims

February 28. I’m sitting in the basement of Guyot Hall, grinding dried algae with a mortar and pestle.

Vials of algae in the freeze-drier – the first stage of analysis.

At this stage, Caulerpa racemosa, the Green Grape Alga, no longer looks its name. In its natural habitat, Caulerpa’s short stalks bob in the water like clumps of balloons. Its round “leaves” are clustered around the stalks just like green grapes, if grapes were the size of pinheads. But by now I’ve freeze-dried these samples so they are shriveled and stiff, and once I’m done grinding them, the plants are reduced to a uniformly fine olive-green powder.

This is what science looks like for me this winter. It’s not simmering test tubes or even statistics: just the incremental alchemy of water samples and crusty Caulerpa into numbers with the potential to tell a reef’s story.

At a recent job interview, I was asked to talk about the lessons I’ve taken away from my research. One image that came to mind was that of my water samples: the hundred or so bottles that I filled in the ocean in Bermuda, carried back to Princeton in a cumbersome cooler, and spent much of this winter analyzing in the lab. Lined up in the freezer, the bottles are identical but for their labels. These bottles contain the most important data I have – and, for months, they’ve looked exactly like identical bottles of water.

But identical they are not. After many a long lab day, I have numbers to crunch – each bottle associated with nutrient concentrations and nitrogen isotope data that begin to tell the reef’s secrets.  These nutrient data represent the raw materials available to plants and animals on the reef. The isotope data help determine where those raw materials have come from, and what organisms are using them. In my thesis, I am studying how nutrient pollution coming from human sewage changes the geochemistry of Bermuda’s reefs, affecting reef organisms, like Caulerpa, that use those nutrients. This has the potential to shift the ecosystem’s balance: nutrient enrichment puts reef-building corals at a disadvantage, threatening the intricate, biodiverse communities – of anemones and angelfish and everything in between – that corals support.

A set of water samples mid-way through vial injections for isotopic analysis.

Continue reading Water Whispering: Memoir of a Winter in the Lab

Science, the Absurd

Posted on by Zoe Sims

It was Wednesday, the final round of my second day of water sampling, when I hit a bump in the road with the rolling cooler I was pulling behind me. The second cooler of water samples, which had been stacked on top, toppled to the asphalt. Eight ice packs and 54 water sample bottles careened out of the cooler and across the road.

I’m using a PVC stick to photograph the reef from a fixed height, in order to take standardized photos of the reef for ecological analysis. This procedure is otherwise known as The Aquatic Gandalf.

This, I thought to myself, throwing my hands up in the air like a cartoon character, is absurd. I scooped the samples up from the pavement, picking a few out from the grassy verge where they’d fallen, and shoved them back into the cooler (carefully packing ice back over the top). I reminded myself, as I have often these past six weeks: This is science.

I’m in Bermuda for two months this summer, studying how polluted groundwater discharge is affecting near-shore coral reefs. The field season has been exciting, fulfilling, challenging, and full of slightly ridiculous situations. I’ve gone swimming along the reef like an aquatic Gandalf, carrying a camera mounted on a PVC stick. I’ve attached equipment to the reef by looping zip-ties through holes in the rocks, and so have spent hours poking these zip-ties into crevasses and attempting to pull them through on the opposite side. Continue reading Science, the Absurd

On Action and Optimism: Notes from the 13th International Coral Reef Symposium

Posted on by Zoe Sims

In the summer of 2016, it is difficult to find optimism in the field of environmental science.

Yet last month, I gathered with a throng of 2,500 coral reef scientists for the International Coral Reef Symposium (ICRS) in Honolulu. Knowing the extent of the tragic coral bleaching and death that has unfolded on coral reefs this year, I expected a week of doom and gloom. But, to my surprise, the conference gave me more cause for hope than for pessimism.

A wasteland of dead coral on Lizard Island, the Great Barrier Reef, this June. High temperatures have caused record bleaching and coral death this year.
A wasteland of dead coral on Lizard Island, the Great Barrier Reef, this May. High temperatures have caused record coral bleaching and death this year.

This is not because the situation facing coral reefs is any better than I’d thought – if anything, it’s worse. Rising greenhouse gas concentrations, warming waters, and stagnant politics have put the biodiversity of coral reefs, along with many other ecosystems, into a sharp decline. On the Great Barrier Reef – a vibrant ecosystem so structurally significant that, unlike the Great Wall of China, it can be seen from space – nearly 25% of coral is dead, from this year’s bleaching alone. At one panel at ICRS, researchers shared photographs and time-lapse footage of coral bleaching and subsequent death around the world. As they flicked through photo after photo, the conference hall adopted the atmosphere of a funeral.

No, things are not looking good for coral reefs, or for many other ecosystems struggling to keep up with the whirlwind of environmental change that stems from human overpopulation, consumption, and industrialization. One scientist, Peter Sale, called coral reefs a “canary” in the proverbial coal mine that is our changing earth. “There are a whole bunch of canaries that are at risk,” Dr. Sale said. “And when the canaries go, our civilization goes.” Continue reading On Action and Optimism: Notes from the 13th International Coral Reef Symposium

Confronting environmental tragedy

Posted on by Zoe Sims

The rapid loss of coral reefs is both heartbreaking and personal for me. I cannot visualize the future of coral reefs without feeling a tug of despair.

A sea turtle swims over a fully-bleached reef on Heron Island, the Great Barrier Reef.
A sea turtle swims over a fully-bleached reef on Heron Island, the Great Barrier Reef.

In January, I wrote about the heat wave that has devastated coral reefs in my home state of Hawaii since last year. Temperatures somewhat subsided in Hawaii over the winter, but summer has hit the Southern Hemisphere hard. What is now being called the 2014-2016 global bleaching event – the third and longest such event ever recorded – is taking a breathtaking toll around the world. Continue reading Confronting environmental tragedy

Seeing the world through its study

Posted on by Zoe Sims

Bermuda is built on the backs of corals. Or it would be, if corals had backs.

Low-lying, wind-resistant vegetation thrives on the island's sandy cliffs.
Low-lying, wind-resistant vegetation thrives on the island’s sandy cliffs.

They don’t. Coral don’t have vertebrae, or heads, or eyes. An entire coral organism – a polyp – is one single, tentacle-ringed cavity, one cavern that is mouth, stomach, and anus combined. Yet these tiny animals are powerful: together, their colonies can grow meters tall, producing hard, rock-like skeletons that form the backbones of coral reefs.

Though perhaps better known for its pink-sand beaches and international banking, Bermuda is also home to spectacular coral reefs. And the low-lying rock island is a monument to the power of calcifying organisms and geological time.

Bermuda from above: the island's northern tip, with outlying patch reefs (the dark spots) visible under the water.
Bermuda from above: the island’s northern tip, with outlying patch reefs (the dark spots) visible under the water.

This is how my adviser, Anne Cohen, explained it to me when I first arrived in Bermuda. It became the way I saw the island, and changed how I saw coral: I began, like Anne and many other researchers, to see my study organisms as the center of my world. Continue reading Seeing the world through its study

Elegy and ode: Finding life on a bleached reef

Posted on by Zoe Sims

2015 shattered temperature records worldwide. This year’s El Niño has been making headlines in the coral reef community since early this summer, as record-high temperatures hit coral reefs more severely than scientists have ever seen before. Yet even knowing these facts, I was not prepared for the devastation I saw at home in Hawaii over winter break.

A healthy coral colony sample from a bleaching study that took place in Bermuda last summer. The tiny flower-like circles are polyps - each one is a coral individual, which together comprise the colony. The yellow color is from this coral's symbiotic zooxanthellae, not the coral itself.
A healthy coral sample (Porites astreoides) from a bleaching study in Bermuda last summer. The tiny flower-like circles are polyps – each one is a coral individual, which together comprise the colony. The coral itself is white – the bright yellow color comes from its symbiotic zooxanthellae.

The population of Pocillopora meandrina, the cauliflower coral that once dotted the coastline of Kailua-Kona, my hometown, has been decimated. The reef is left with the feel of an evacuated city: the coral heads are like abandoned buildings, their skeletons lifeless and vacant. Lacking the organisms that sustained them, they slowly begin to crumble.

Continue reading Elegy and ode: Finding life on a bleached reef