Marine Life & Conservation
Rare Caribbean Coral Grown In Lab For The First Time
Caribbean pillar coral, a rare and threatened coral species, has been bred and raised in a lab by scientists for the first time.
The work provides the first photos and documentation of juveniles of this species, and could provide information to aid the conservation of coral reefs in the study area.
The team plans to “out-plant” these lab-grown juveniles in the wild, which could help populations become more resilient to climate change.
The Caribbean pillar coral Dendrogyra cylindrus is rare and understudied, and small juveniles of this species have never been seen in over 30 years of surveys in the Caribbean. The species is one of very few corals in the Caribbean that forms large branches which can provide shelter for important fish species and can reduce the energy of storm surge as it approaches shore.
“Strangely enough, pillar corals happen to spawn just half an hour before another threatened coral that is far better studied —t he elkhorn corals,” says Kristen Marhaver, lead author of the study and senior fellow at TED.
“So the reason why for so many years we’ve never witnessed spawning pillar corals is that while they were spawning, virtually all coral spawning researchers and photographers in the Caribbean were on their boats doing final preparations on their dive gear for elkhorn coral spawning. It was literally right under our noses for years.”
The findings were presented at a TED Conference in Vancouver, Canada last night, and also appears in the journal BMC Ecology. Mónica Medina, associate professor of biology at Penn State, is a coauthor of the study.
‘SMOKE STACK’ CORALS
Pillar corals form a unique “smoke stack” shape like no other coral species, and they display unusual mating behavior compared to most spawning coral species. Most spawning corals are hermaphrodites that release large bundles of eggs and sperm.
Pillar corals, which spawn only on a few specific nights of the year, build colonies that are either all male or all female. The males first release sperm into the seawater, shortly followed by the females releasing their individual eggs. This timing makes collection and breeding research extremely difficult.
“Now that we’ve successfully reared juvenile pillar corals in the lab, not only can we study them in more detail to find out what factors could be threatening their survival in the wild, but it also means that we can try to out-plant a small number back to the reef,” says Marhaver, who began this work as a postdoctoral researcher at the University of California.
“We don’t know if this will work and it is certainly not a cure-all for the reef. But especially in such a rare coral species, a tiny boost of a few new individuals could make a big difference in their genetic diversity, allowing their populations to adapt and become more resilient to the changing environment in the oceans.”
AFTER THE FULL MOON
After studying the sunset times and lunar cycles taken from other spawning observations, the research team timed their egg and sperm collection around the most likely annual spawning times — exactly three nights after the August full moon and around 100 minutes after sunset.
At depths of roughly 20-22 feet on a Curaçaoan coral reef with a large population of pillar corals, the team arranged nets and funnels over the female colonies to automatically collect eggs, and used syringes near the male colonies to manually collect sperm from spawn clouds as they appeared.
The team then attempted to fertilize the eggs by mixing the collected eggs and sperm underwater and on shore.
In the lab, the team carefully adjusted several factors related to fertilization times and seawater type and nurtured the eggs to develop into larvae. The scientists managed to successfully grow the embryos to the swimming larvae stage—the first time this have ever been seen—and settled them onto ceramic tripods in water tanks. The settled juveniles then survived for over seven months.
HOW TO PROTECT CORALS
Now that they have determined how best to grow these coral in the lab, work can begin on studying how different factors affect their survival. By testing in the lab the effect of water type, contaminants, or the presence of different species of animals and bacteria, the scientists may be able to translate these findings to the wild, and explain why juvenile pillar corals are missing in certain areas.
This research may help to support the protection of local coastal areas. Populations of branching coral colonies often are identical genetically, making them extremely susceptible to threats such as disease and temperature shock. The team therefore plans to return a few lab-reared juveniles to the reef to see if they will grow and help jump-start the population’s genetic diversity.
This work could help the species to adapt and to become more resilient to threats such as climate change. Evidence is growing that juvenile corals can adjust better than adult corals in some places to changing environments. The introduction of new juveniles to the reef, therefore, could help buffer these ecosystems against global threats that affect all corals.
“Given how rare the juveniles are in nature, it was a bit of a question whether the species was still reproducing at all,” says Marhaver. “Corals can also reproduce by fragmentation, so a huge field of pillar corals could in fact be from one single parent colony and might not be able to reproduce.
“Now that we have some of the first solid evidence that they are still able to reproduce, it means we can be cautiously optimistic about the future of this threatened species.”
Source: www.futurity.org
Photo: Kristen Marhaver
Marine Life & Conservation
Shark Trust launches Oceanic 31 Shark Art Auction
After a two-year tour of UK art galleries, community spaces and aquariums, the Shark Trust’s acclaimed Oceanic31 exhibition takes its final bow at the Royal Geographical Society later this month. And the unique collection of artwork, depicting 31 species of oceanic sharks and rays, donated by 31 artists, is now open for bids from art lovers and shark enthusiasts. The online auction, launched today, will close on the 7th December at 8pm (BST). The money raised will support the Shark Trust Oceanics Programme.
People can now bid on 27 of the artworks by visiting this website:
https://superstars-auctions.com/sharktrustauction
It is a chance to own a beautiful piece of original art and to support the Shark Trust. The timing of the auction also means that these would make a very special Christmas gift for any shark-lover.
The diversity of pieces mirrors that of the sharks and rays they represent. You can bid on paintings, digital creations, sculptures, mixed media and more. You can pick your favourite artist or species of shark. Or you can select the perfect artwork to make a statement in your home or office. Whichever you choose, you will be supporting the work to protect these amazing animals.
One of the pieces of art has been selected to be auctioned live by Steve Backshall at the For the Love of Sharks event at the Royal Geographical Society in London on the 29th November. In addition to this, two further pieces will be raffled at this event, giving people a chance to win an incredible piece of shark art. For the Love of Sharks is the Shark Trust’s flagship evening. A night to celebrate sharks. Steve Backshall is the headline speaker at this event that will see other prominent shark advocates join him on stage.
Tickets for the event can be snapped up here:
https://thesharktrust.org.uk/Event/flos24
Those that would like to see the Oceanic 31 exhibition have one final chance. It is being displayed at the Pavilion at the Royal Geographic Society from 26th November until the 7th December. Entry is free.
Find out more here:
https://www.rgs.org/events/upcoming-events/oceanic-31
Paul Cox, Shark Trust CEO, Said “This exhibition has given us the opportunity to reach out to a new audience. And inspire more people with the wonderful sharks and rays on which our Big Shark Pledge campaign is based. We are immensely grateful to the 31 artists who have worked so hard to create these works.”
Bid for your favourite Oceanic 31 artwork here:
https://superstars-auctions.com/sharktrustauction
Banner Image: Smooth Hammerhead by Alicia Hayden
Marine Life & Conservation
Meet Steve Backshall in the Bite-Back Prize Draw
Until 28 November, prizes worth a massive £10,000 – including experiences, products and tuition – feature in a line-up of items that can be won for £5 in an online prize draw to celebrate Bite-Back Shark & Marine Conservation’s 20th anniversary and help generate crucial funds for the future.
Top of the list of prizes is the chance to spend time with adventurer and wildlife expert Steve Backshall, a workout session with Nat Geo star Aldo Kane, a kayaking trip alongside white-water expert and diver Sal Montgomery and a Zoom call with ‘shark whisperer’ Cristina Zenato.
On top of that, some of the most admired companies in the diving and scuba industry have been quick to support the charity with fabulous prizes that make the £5 ticket price worth more than just a flutter.
Master Liveaboards, BSAC, Midlands Diving Chamber, Go Freediving and Blue Shark Snorkel have all generously donated experience prizes, while celebrated photographer Alex Mustard has donated a print and artists Scott Gleed and Olivier Leger have donated a sculpture and illustration to help boost the fundraising pot.
Fourth Element has donated Ocean Positive gear and LA watch company Nodus has gifted the charity a stunning dive watch. For land lovers, the charity has included a five star London hotel stay at Bankside Hotel plus a family visit to Longleat Safari Park in the roster of prizes.
Campaign director for Bite-Back, Graham Buckingham, said: “We’ve been overwhelmed with support from companies and individuals that we truly admire and who have supported us on our 20 year journey and we’re truly grateful to them all. While we feel incredibly proud of our achievements over the past two decades – and we are super excited about the next chapter – this prize draw isn’t a vanity project. It represents a real lifeline to our work and important advancements in the global protection of sharks. So we hope divers, dive clubs and even bargain hunters grab some tickets to make this a massive success.”
The charity hopes that the prize draw will generate crucial funds to launch a brand new, ground-breaking, campaign to enrol the public and increase support for the protection of sharks around the world.
To enter the competition visit www.bite-back.com/prizedraw. The prize winners will be announced on 1 December 2024.
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