Tag: marine biology

Whale Sharks: Swimming with the World’s Largest Fish

They’re the largest fish in the world, not to mention one of the most fascinating. Marine blogger Alison Green jumps into the clear waters of the Gulf of California for a close encounter.

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CSI: Sea Turtle Unit

Where do turtles nest? What species nest there? Are their eggs harvested by people and predators? Are they vulnerable to sea level rise? Marine biologist Rod Salm follows the tracks in the sand to answer these and other questions.

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Flushing Out the Truth About Sewage and Coral Reefs

I never expected to be so intrigued and excited about poop, until a paper in PloS ONE came out in 2011 that demonstrated that a common human pathogen found in human wastewater, Serratia marcescens strain PDR60, caused white pox disease in elkhorn coral (Acropora palmata), the foundation species in Caribbean coral reefs.

Caribbean reefs have been plagued by disease in recent years and figuring out the source of the pathogens has been a challenge. Human sewage has long been a suspect, but the science behind this suspicion was always tenuous. I think most people would assume that exposing reefs to partially treated or untreated sewage couldn’t be a good thing, but there were no clear data that made the connection of human sewage to the degradation of corals so clearly until this paper.

Unfortunately, there is plenty of untreated sewage making its way into tropical seas.

In the Caribbean, most sewage isn’t actually treated, rather it is put into containers that sit in the ground — the ground being comprised of porous calcium carbonate rock (limestone) that is characteristically leaky.

In many places in the Pacific, the ocean is the toilet.

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Oceans and Climate Change: Protecting the “Invisible”

Coral bleaching, increasing storms, the loss of polar bears: many impacts of climate change are already vivid in our minds. We naturally worry about the things we can see. Huge waves and the loss of big fish and colorful corals get our attention.

But what about things we can’t see, like the tiny creatures called plankton? They are also poised for dramatic changes.

A recent dive in the sapphire waters of the Caribbean offers a close encounter with plankton. While most of my dive buddies hurry to reach the bottom, I linger as I usually do, pondering the “blue” and looking out for the visible and the invisible.

Suddenly, clouds of tiny filaments come sharply into focus. It’s blue-green algae–Trichodesmium–a type of phytoplankton that plays an important role in these nutrient-poor waters. They essentially break gaseous nitrogen’s tough triple bond and convert it into a form other phytoplankton can feed on.

What would these waters look like without them?

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The Life and Death of a Majestic Old Coral

In July, I introduced via The Nature Conservancy’s photo of the month what may then have been the world’s largest living table coral (pictured above).

I found it on a reef in Nusa Laut, Indonesia. I also indicated that the coral felt like an old friend to me and that I would develop a knot in my stomach on visiting the reef in anticipation of finding my “old friend” dead or damaged.

Table corals are not as long lived as some of their massive boulder forming community members.

The reason is that table corals grow by dividing horizontally away from the center after reaching a certain thickness.

The central polyps stop dividing vertically and eventually get old and die from natural senescence. The center of any very large table coral colony usually is dead.

Massive corals on the other hand, like some we’ve seen in our Indo-Pacific seas, may be hundreds to over a thousand years old.

These corals grow by dividing vertically and thus are constantly renewing themselves as they grow upwards and outwards.

Table corals are also vulnerable to toppling by storm surges and breakage of their narrow pedestals when shaken by earthquakes and tremors in seismically active areas like those in the West Pacific and Coral Triangle.

How these corals respond to the stress of being shaken and toppled is a great indicator of their resilience. Some simply give up and die. Other more resilient ones seem to shrug off the stress and reorient their plane of growth, contributing dramatic new architecture to the reef community.

I exhorted friends who visited the Nusa Laut reef in November last year to measure the majestic table coral precisely and report on its well-being.

The news wasn’t good.

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Forest Dilemmas

Too many deer. Logging one tree to save another. Beavers versus old growth. Welcome to forest conservation in the 21st century. Join us for a provocative 5-part series exploring the full complexity facing forest conservation in the eastern United States.

What is Cool Green Science?

noun 1. Blog where Nature Conservancy scientists, science writers and external experts discuss and debate how conservation can meet the challenges of a 9 billion + planet.

2. Blog with astonishing photos, videos and dispatches of Nature Conservancy science in the field.

3. Home of Weird Nature, The Cooler, Quick Study, Traveling Naturalist and other amazing features.

Cool Green Science is managed by Matt Miller, the Conservancy's deputy director for science communications, and edited by Bob Lalasz, its director of science communications. Email us your feedback.

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How can California conservationists accurately count thousands of cranes? Enter a new tool in bird monitoring: the drone.

Creating a Climate-Smart Agriculture
Can farmers globally both adapt to and mitigate the impacts of climate change? A new paper answers with a definitive yes. But it won't be easy.

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