SCUBA News 234
(ISSN 1476-8011)
21 December 2019
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SCUBA News (ISSN 1476-8011)
Issue 234 - December 2019
https://www.scubatravel.co.uk
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Welcome to SCUBA News. Our complements of the season to you.
You can download a pdf version of the newsletter here.
Contents:
What's new at SCUBA Travel?
Featured Liveaboards: Longimanus
Creature of the Month: Christmas Tree Worm
Diving news from around the World
What's New at SCUBA Travel?
On the humpback whales migratory path, Madagascar has sea creatures not found anywhere else and one of the world's longest continuous coral reefs.
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Diving the Bay Islands of Honduras Where you are almost guaranteed to see a whale shark between mid-Feb and April and the water is warm throughout the year. Which island to choose - Roatan, Utila or Guanaja?LEARN MORE… | |
Dive somewhere different - Oman The best diving areas? The Musandam peninsula, Daymaniyat Islands and Fahl Island. |
Featured Liveaboards - 10% off Red Sea
10% off Red Sea Liveaboard for 2020 Trips
Book now to visit the fabulous south of Egypt on the Longimanus liveaboard and save 10% with early bird discount.
Creature of the Month: Christmas Tree Worm
Colourful Christmas tree worms are captivating during any dive, adding a touch of festive magic to coral reefs around the world.
What are Christmas tree worms?
They might look like colourful Christmas trees but they're actually segmented worms. Most of their structure is hidden in tubes within the coral, with only their crowns or Christmas trees protruding. These creatures can live for 40 years!
Their scientific name is Spirobranchus giganteus, meaning Giant Spiral-Gills. Although the visible part is only 1.5 cm long, together with its hidden part it is in fact one of the largest worms in its family. The branching crown is important for respiration, hence the "spiral-gills" name.
Each worm has two crowns or Christmas Trees. The worms come in a myriad of colours, but an individual's two crowns are always the same colour. As well as being used in respiration, the the feathery Christmas Tree gathers food, wafting it down to the worm's mouth.
On sensing danger, the worm quickly retracts its crown into its tube in the coral and closes the entrance with a trapdoor called an operculum. It will stay down there for about a minute, before re-emerging very slowly to check that the danger has gone.
There are both male and female Christmas tree worms and they are choosy; spending their entire life on the same coral - often massive porites. They are important for the health of coral reefs and help protect corals from aggressive sea stars, whilst also stopping algae growing over the coral.
Where do they live?
The great thing about Christmas tree worms is that you can see them around the world on most tropical reefs. They're easy to find and very photogenic, making them great subjects for macro photography. As long as you have the patience to wait and not disturb them into shooting back into their tubes. You might see them down to depths of 30 m.
Animalia (Kingdom) > Annelida (Phylum) > Polichaeta (Class) > Sedentaria (Subclass) > Sabellidae (Order) > Serpulidae (Family) > Spirobranchus (Genus)
Further Reading
The Wonderful World of Christmas Tree Worms
Coral Reef Guide Red Sea, Lieske and Myers
Red Sea Reef Guide, Helmut Debelius
Age-estimation of the Christmas Tree Worm Spirobranchus giganteus (Pomlychaeta, Serpulidae) Living Buried in the Coral Skeleton from the Coral-growth Band of the Host Coral. Eijiroh Nishi, Moritaka Nishihira 2016
Diving News From Around the World
Our round up of the best underwater news stories of the past month. For breaking news see our Twitter page or RSS feed
Divers visiting Solomon Islands need proof of measles vaccination
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Where to dive in January?
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The Lionfish Takeover Could Get Worse
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Living Museum of the Sea Established in Dominican Republic
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Boom in seahorse poaching spells bust for Italy's coastal habitats
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Orca grandmothers help improve survival odds of their grandkids, study finds
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Sea turtles continue to swim in troubled waters: report
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EU Fisheries Management Improves but Still Lags Behind Scientific Advice
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2018 saw record breaking greenhouse gas concentrations
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Photo credits: Tim Nicholson, Jill Studholme, Captain Victor Organ
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Jill Studholme
SCUBA News
The Cliff
DE6 2HR
UK
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