Marine Life & Conservation
Rising Temperatures In The Atlantic Ocean Could Pose Threat To Coral Reefs
Ecologists are reporting that rising temperatures in the Atlantic Ocean may be allowing certain tropical fish to spread to shallow waters that are becoming warmer, an expansion that could pose a significant threat to coral reefs.
A study of 40 species along the reefs off the North Carolina coast shows northward movement by the invasive and poisonous lionfish, according to researchers from the National Oceanic and Atmospheric Administration (NOAA) and the University of North Carolina-Wilmington, who published their findings in the September issue of Marine Ecology Progress Series.
“Globally, fish communities are becoming more tropical as a result of warming temperatures, as fish move to follow their optimal temperature range,” study author Paula Whitfield, a research ecologist at NOAA’s National Centers for Coastal Ocean Science, said in a news release. “Along the North Carolina coast, warming water temperatures may allow the expansion of tropical fish species, such as lionfish, into areas that were previously uninhabitable due to cold winter temperatures.”
The Indo-Pacific lionfish was first sighted off the east Florida coast in the late 1980s. They have since spread throughout the western North Atlantic, including the Gulf of Mexico and Caribbean, according to the news release.
In 2000, the lionfish was also reported off the coast of North Carolina. Historically, both temperate and tropical species live in the North Carolina reefs, confined to their range limits by water temperatures. But, the researchers noted, temperatures in this zone are becoming more tropical.
Lionfish are viewed as a major threat to Atlantic reefs by reducing reef fish recruitment and biomass, the researchers said, and they may be involved with cascading impacts such as decreased coral cover on coral reefs.
For their findings, the researchers combined year-round bottom water temperature data with fish community surveys in water depths from 15 to 150 feet off the coast of North Carolina from 2006 to 2010.
“The temperature thresholds collected in this study will allow us to detect and to estimate fish community changes related to water temperature,” explained Whitfield.
“This kind of monitoring data set is quite rare because it combines multiyear quantitative fish density data with continuous bottom water temperature data from the same location,” added the study’s co-author, Jonathan A. Hare, NOAA Fisheries research oceanographer, in the release.
The researchers found the fish community in deeper water, from 122 feet to 150 feet with a winter mean temperature of 69.8 degrees Fahrenheit, was primarily tropical. They concluded that water temperature was a key factor in controlling their expansion.
And they noted lionfish have become the most abundant species in those areas. Although the lionfish were restricted to depths below 87 feet where the average water temperature was higher than 59.5 degrees, the fish could spread to shallow waters that are becoming warmer.
“The results will allow us to better understand how the fish communities might shift under different climate change scenarios and provide the type of environmental data to inform future decisions relating to the management and siting of protected areas,” said Whitfield.
Source: consumer.healthday.com
Shark Guardian has just unveiled their largest and most exciting expedition yet: a seven-night, eight-day adventure in August 2026 aboard the Galaxy Diver II, a state-of-the-art
vessel specifically designed for divers exploring the enchanting waters of the Galapagos
Islands. This is a once in a lifetime opportunity to engage deeply with marine
conservation in one of the world’s most revered diving destinations.
Shark Guardian is a UK registered charity dedicated to protecting sharks and marine
ecosystems worldwide. Founded by marine biologists and conservationists, Brendon
Sing and Liz Ward-Sing, Shark Guardian leads educational programs, research projects,
campaigns and expeditions aimed at fostering a better understanding and respect for
marine life. Their work spans several continents and focuses on direct action,
education, and advocacy.
Shark Guardian’s ethos revolves around the concept of “diving with a purpose.” This
philosophy underscores the importance of not just experiencing the wonders of the
underwater world but actively learning and contributing to its preservation. Participants
in Shark Guardian expeditions engage in citizen science projects, which involve
collecting data that supports ongoing research and conservation efforts. These
activities empower divers to make a tangible difference, turning each dive into an act of
conservation.
One of the newer additions to the Galapagos diving scene, the Galaxy Diver II, is
specifically tailored for divers. Its design prioritises comfort, safety, and environmental
responsibility. The vessel boasts modern amenities, spacious dive decks, and the latest
navigational technology, ensuring that every dive is not only memorable but also has
minimal environmental impact.
A highlight of this expedition is the opportunity to dive at Wolf and Darwin islands,
renowned for their vibrant, untouched marine ecosystems and as a haven for large
pelagic species. These islands are famous for their schools of hammerhead sharks,
whale sharks, and manta rays, offering spectacular diving that attracts enthusiasts from
around the globe.
Shark Guardian have developed this trip to ensure a hassle-free experience. The
expedition package also includes internal flights from Quito, Ecuador, to the Galapagos,
plus accommodation in Quito before and after the trip. This allows divers to relax and
enjoy the experience without worrying about logistics.
Participants will join a diverse group of passionate divers and conservationists. This trip
offers a unique opportunity to network with like-minded individuals who are eager to
learn about and contribute to marine conservation. It’s a chance to share experiences,
knowledge, and a commitment to protecting the marine world.
Shark Guardian is offering an early bird price available until May 31st 2024. This special
rate provides a fantastic opportunity to secure a spot on this exclusive expedition at a
reduced cost. Availability is limited, so interested divers are encouraged to act quickly
to ensure they don’t miss out. All the details can be found on their WeTravel page, where
bookings can be made easily and payment instalments are available.
Expedition Galapagos, aboard the Galaxy Diver II offers more than just a diving
holiday—it is an investment in both personal and planetary well-being. By participating,
divers not only witness the majesty of one of the world’s premier diving locales but also
contribute to its preservation for future generations.
Find out more about Shark Guardian at www.sharkguardian.org.
The Shark Trust has launched their new podcast. Delve behind the scenes and gain exclusive insights in the world of shark and ray conservation on The Shark Trust Podcast. Out Now!
Join the Shark Trust on this journey as they explore the diverse world of sharks. Hear from experts from different backgrounds and learn how you can become a part of the global effort to protect these vital species.
Whether you’re a seasoned shark expert or just dipping your toes beneath the surface, this podcast offers something for everyone!
In the first series you will hear from the Shark Trust team. Shark Trust Patrons, Monty Halls, Miranda Krestovnikoff and Simon Rogerson. Divers with a passion for sharks. And some of the Oceanic 31 artists.
New episodes released every two weeks on all major podcast platforms and watch full video versions on the Shark Trust YouTube Channel. Keep your eyes peeled for the bonus minisodes!
There are two available to dive into right now!
Episode 1: Dive beneath the waves of shark and ray conservation with Mark as he speaks with Paul Cox, CEO of the Shark Trust. Paul and Mark discuss the threats and difficulties that sharks and rays currently face in the modern world. And how the Shark Trust is working to create a better future for them!
Bonus Minisode: Join Mark at Go Diving, the UK’s biggest dive show. He interviews Shark Trust Patron, Simon Rogerson, about his diving experiences and how seeing sharks can transform your life!
For more information about the work of the Shark Trust, visit their website here.
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