Features

Foraminifera are windows to understanding long-term coral reef stress

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This guest blog comes from Dr. Alexander Humphreys, a geology lecturer and researcher at the University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science. The Khaled bin Sultan Living Oceans Foundation is working with Dr. Humphreys and our partners at UM on a new National Science Foundation (NSF)-funded project, “Protists Prophets,” that is looking at benthic sediment samples collected on the Global Reef Expedition (GRE) to assess the state of the coral reef environment over the past 1,000 years.

I am a modern benthic foraminiferal researcher, which means that I study some of the tiniest organisms in the ocean in order to learn about past environmental conditions on coral reefs. However, before we get to this story, let me first explain a bit about these little critters and their importance to science.

Foraminifera, or forams for short, are protists, which are single-celled amoeba-like organisms that grow a protective shell, called a ‘test’. Today there are roughly 4,000 species of forams and they can be found living in all the world’s oceans, from polar environments to the deepest ocean trenches nearly 11 km down. Forams are important to science because they have short lifespans and are sensitive to environmental change. This sensitivity causes rapid shuffling of species abundances over time as the environmental conditions and climates gradually—and sometime abruptly—fluctuate. When the life of a foram comes to an end, the story does not stop there because even though the organism decays, its hard protective test preserves well and fossilizes, laying down evidence of these population changes in the geologic record—one that goes back 500 million years! I approach this deep fossil record of foraminifera like the pages in a book that tells the story of oceanic and environmental change. The trick is learning how to read the story that these little protists have to tell.

One month left to apply for the Science Without Borders® Challenge!

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There is still time to participate in our international student art competition, the Science Without Borders® Challenge! Students must submit their artwork by March 7 for a chance to win up to $500 in prizes. 

This year the Science Without Borders® Challenge theme is “Ridge to Reef.” This type of conservation approach works to conserve coral reefs by addressing issues across the entire watershed, from the top of the land down the streams, through mangrove forests and seagrass beds, and out to the reefs themselves. For this year’s theme, we are asking students to create a piece of art that illustrates one or more ways people can use this conservation approach to protect coral reefs. 

Shark tagging with our partners, Black Girls Dive Foundation

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“There’s a shark on the line!” The young ladies from Black Girls Dive Foundation (BGDF) squirmed with anticipation and giggled with excitement. As their chaperone, I could feel my own adrenaline surging as we watched the University of Miami (UM) team scurrying around at the back of the boat. The chaperones fitted the first four students with gloves and life vests. Then the students lined up in single file to begin their assigned individual and group tasks. It was time to get to work.

In December, I had the honor of being asked to join our partners at Black Girls Dive Foundation on a shark tagging expedition with the UM Professor Neil Hammerschlag’s Shark Research and Conservation team at Rosenstiel School of Marine and Atmosphere Science. The trip is part of BGDF’s Science, Technology, Robotics, Engineering, Arts and Mathematics with SCUBA (STREAMS) program, which is designed to introduce black girls between the ages of 9 and 17 to a multitude of activities. The Shark Research and Conservation Capstone is a component of the STREAMS program that teaches about the behavioral ecology and conservation of sharks. After completing a series of lecture and lab activities, this part of the program culminates with a field-intensive research expedition: shark tagging.

Corals in the Anthropocene

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This guest blog comes from a former KSLOF fellow, Dr. Anderson Mayfield, who joined the foundation on many of our Global Reef Expedition research missions in the Pacific and Indian Oceans. A former student of the renowned coral biologist Dr. Ruth Gates, Dr. Mayfield studies coral health and physiology at NOAA’s AOML Coral Program and at the University of Miami’s Cooperative Institute for Marine and Atmospheric Studies. He continues to publish scientific papers based on data collected on the Global Reef Expedition, including his latest paper, recently published in the journal Oceans.

As a naïve post-doctoral researcher back in 2012, I had an idea that was surely far from novel at the time: corals of far-flung, uninhabited atolls are in better shape than those closer to major human population centers. The logic was that these corals would be under global-scale stressors only (namely those associated with climate change), and not the threats that instead plague reefs close to cities (such as pollution and overfishing).

As a fellow with the Khaled bin Sultan Living Oceans Foundation during their Global Reef Expedition (GRE), I tested this hypothesis by sampling corals from among the most seemingly pristine islands and atolls in the Pacific and Indian Oceans. Although we certainly observed beautiful reefs with high coral cover (see image above) and diversity as well as a plethora of fish —all the visible hallmarks marine biologists look for in ‘healthy’ reefs—the corals themselves told a different story (Mayfield et al., 2017); high cellular stress levels were documented in the vast majority of the many hundreds of corals sampled across the GRE.

Despite looking healthy, the corals were struggling to survive.

These high stress levels do not, in and of themselves, imply that all such sampled corals are not long for this Earth. They do signify, however, that we likely never visited ‘pristine’ reefs during the GRE, despite studying some of the most remote coral reefs on the planet. This is a testament to the wide reach of climate change. This statement may come as a surprise to some, who, like me, assumed that somewhere out there, one might find corals entirely untouched by humankind, but this unfortunately does not appear to be the case.

Global coral reef survey reveals extent of reef crisis

Oceanographic Magazine By Oceanographic Staff October 21, 2021 ON 21 OCTOBER, THE KHALED BIN SULTAN LIVING OCEANS FOUNDATION PUBLISHED THEIR FINDINGS FROM THE GLOBAL REEF EXPEDITION, THE LARGEST CORAL REEF SURVEY AND MAPPING RESEARCH MISSION IN HISTORY. NEARLY EVERY LOCATION SURVEYED …

Global Reef Expedition reveals the extent of the coral reef crisis

Earth.org by Ashikha Raoof October 13, 2021 A new study from the Khaled bin Sultan Living Oceans Foundation (KSLOF) has investigated the state of coral reefs around the world. The researchers surveyed and mapped coral reefs in the Atlantic, Pacific, …