Tag: coral reefs

Coral Biopsy

Location, Location, Location: How Habitat and Microbiomes May Contribute to Coral Outplant Success

A new study by coral researchers from the University of Miami’s Cooperative Institute for Marine and Atmospheric Studies (CIMAS) and NOAA’s Atlantic Oceanographic and Meteorological Laboratory suggests that the physical oceanographic habitat characteristics-such as, temperature, light availability, and water flow, of corals, may influence microbe communities and health of coral reefs.  The results showed a link between physical habitat and coral microbiology in coral reefs in southeast Florida. 

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Picture of O. faveolata colony synchronously releasing gamete bundles approximately 3.5 hours after sunset

Moonlit coral spawning event will shed light on coral resilience in the Florida Keys

Last week AOML and CIMAS coral researchers, Graham Kolodziej, Anderson Mayfield, and Derek Manzello, entered the ocean off of the Upper Florida Keys to collect tiny floating balls being released from the protected mountainous star coral (Orbicella faveolata). Taking place shortly after moonrise, the spawning process is a visually beautiful part of the circle of life for corals, releasing gametes into the ocean water to become fertilized and eventually settle to create new corals stony coral colonies.

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Subsurface Automated Samplers on the reef. Photo Credit, NOAA.

Scientists Use 3D Printing Technology to Study Water Chemistry at Coral Reefs

AOML researchers have taken an innovative approach to studying the changing carbonate chemistry of seawater at shallow coral reef sites. Using 3D printing technology made possible by the new Advanced Manufacturing and Design Lab at AOML, researchers with the Acidification, Climate, and Coral Reef Ecosystems Team, or ACCRETE, have created a water sampler in-house.

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Cheeca Moasaic Comparison

Coral Bleaching Study Offers Clues about the Future of the Florida Keys Reef Ecosystem

A recent study by AOML and partners identified coral communities at Cheeca Rocks in the Florida Keys National Marine Sanctuary that appear to be more resilient than other nearby reefs to coral bleaching after back to back record breaking hot summers in 2014 and 2015 and increasingly warmer waters. This local case study provides a small, tempered degree of optimism that some Caribbean coral communities may be able to acclimate to warming waters.

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Orbicella faveolata

Threatened Corals See Effects of Sedimentation Stress in Early Life Stages

Coral scientists at NOAA’s Atlantic Oceanic and Meteorological Laboratory (AOML) are in the process of analyzing data that may shed light on the sub-lethal effects of sedimentation stress in coral larvae. Scientists recently conducted a series of lab experiments aimed at assessing the effects of Port of Miami dredge sediments on the larval performance of the Caribbean threatened coral Orbicella faveolata (also known as the mountainous star coral). Preliminary analysis suggests significant effects of sedimentation on both the survival and settlement of coral larvae.

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Coral Biopsy

Land-Based Mircobes Affecting Coral Reefs

Scientists found that microbes and their genetic material from land-based sources of pollution could be found in reef water and in tissues of corals. This could affect the genomics of the native microbial communities found in coral reefs, which can impact how corals thrive and survive. These new insights highlight an additional potential threat to corals from land-based sources of pollution in southeast Florida, where corals are already under existential threat from warming oceans and resulting coral bleaching, disease and mortality.

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Scalloped Hammerhead Sharks

Galapagos Islands: A Telling Study Site for Coral Reef Scientists

Coral scientists recently traveled to the Galapagos Islands to document coral reef health following the 2016-17 El Niño Southern Oscillation event (ENSO), which bathed the region in abnormally warm waters. Historically, these events have triggered coral bleaching and large-scale mortality, as seen in response to ENSO events of 1982-83 and 1997-98. Interestingly, these same reefs exhibited minimal bleaching in response to this most recent event. Scientists are determining whether this response is due to differing levels of heat stress, or an increased tolerance to warm water in the remnant coral communities.

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Temperature Sensor

Novel, Inexpensive Temperature Sensor Unlocks Coral Monitoring Challenge

Warm ocean water can be a killer for coral reefs, and AOML recently developed a new inexpensive sensor to drastically improve our ability to measure and monitor changing temperatures on reefs at an unprecedented scale.  The low cost sea temperature sensor, known as InSituSea, costs roughly $10 in parts to produce while providing high accuracy (0.05-0.1 C) in measurement. With a production cost that is 10% of an off-the-shelf temperature sensor, colleagues have expressed strong interest in deploying the InSituSea sea temperature sensor at coral reefs around the world.  

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Coral Skeleton covered in reef organisms

Study shows ocean acidification is two-front assault on coral reefs

The study, published in the Proceedings of the Royal Society B, measured changes in the reef framework in several naturally high-carbon dioxide settings near Papua New Guinea. For the first time, scientists found increased activity of worms and other organisms that bore into the reef structure, resulting in a net loss of the framework that is the foundation of coral reef ecosystems.

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High-resolution photomosaic images taken at Maug Island. Photo Credit: NOAA

Volcano Spewing Carbon Dioxide Drives Coral to Give Way to Algae

The new research published online August 10 in Nature Climate Change provides a stark look into the future of ocean acidification – the absorption by the global oceans of increasing amounts of human-caused carbon dioxide emissions. Scientists predict that elevated carbon dioxide absorbed by the global oceans will drive similar ecosystem shifts, making it difficult for coral to build skeletons and easier for other plants and animals to erode them.

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