SCUBA News 214
28 March 2018
SCUBA News (ISSN 1476-8011)
Issue 215 - April 2018
Welcome to the 215th issue SCUBA News. I hope you find it useful. Any questions or comments email firstname.lastname@example.org.
You can download a pdf version of SCUBA News here.
Madagascar, the world's fourth largest island, hosts one of the world's longest continuous coral reefs. The country is famous for her unique land animals, but her seas are also full of life not found anywhere else.
The best diving in Antigua is in the south of the island, around English Harbour. The north is shallow and quite sandy, but calm and good for beginners.
See which Italian dive centres have been given the five fish rating.
Dive Egypt's most southerly spots
For beautiful deep walls and oceanic white tip sharks.
I wonder if anyone else feels this way about dive travel. How many have booked dive travel through a shop? You are basically paying for the dive shop person to go on a trip and take their pics . I do not see any added value they offer. Would love to hear others views.
Sean S, via Twitter
Attack of the killer clones: Plumose anemones strike their neighbours
You often see small forests of Plumose anemones when diving in temperate waters. The is due to their ability to clone themselves.
Genetically different patches of clones are often separated by narrow paths free of anemones. Along the edges of these corridors, the anemones often possess two types of tentacle. One type for catching food and one much smaller type which can expand tremendously. They use these expanding tentacles to reach over and attack non-identical anemones across the border. The tip of the tentacle doesn't hurt anemones the same as itself, it only discharges its stinging nematocysts upon contact with a genetically different individual. After stinging the tentacle breaks, leaving about 1 cm of the tip attached to the victim. The tissue around the sting dies as, occasionally, does the victim.
Plumose anemones comprise a tall, smooth column topped with a crown of feathery tentacles. When they contact they look like swirly blobs.
Individuals are usually white or orange, although they are sometimes dark green, grey or brown in colour. They grow up to 30 cm tall and 15 cm across at the base. They like areas with currents so tend to live on prominent pieces of wrecks or on rocky pinnacles - in other words, in good diving areas
With fine, delicate tentacles they are unsuited to capturing large animals like fish. Instead they specialise in smaller prey such as small planktonic crustaceans. The anemone's columnar body is narrower just below the tentacles. A current will bend the stalk at this point and expose the tentacles broadside to the flow in the best position for feeding on suspended matter.
The Plumose anemone occurs from the Bay of Biscay (North of Spain) to Scandinavia in the northeast Atlantic, and on the west and east coasts of North America. It is unknown from the western basin of the Mediterranean but has been seen in the Adriatic, where it is believed to have been introduced. It has also been seen in Table Bay Harbour in South Africa where it was probably introduced from Europe.
Plumose anemone with jellyfish
The common name comes from pluma - feather. The Latin name, which it was given by Linnaeus, is Metridium senile which means Fruitful old - probably a reference to its cloning ability. There is some confusion as to whether this has been replaced by the name M. dianthus, but M. senile is still the accepted name according to ITIS - the Integrated Taxonomic Information System. M dianthus is listed as a different species but with "data quality indicators unverified".
Animalia (Kingdom) > Cnidaria (Phylum) > Anthozoa (Class) > Hexacorallia (Subclass) > Actiniaria (Order) > Enthemonae (Suborder) > Metridioidea (Superfamily) > Metridiidae (Family) > Metridium (Genus) > Metridium senile (Species)
5 Ways to overcome dive anxiety
Cost of Sipadan diving permit to rise by 250 Percent
Where to dive in April & May?
Underwater sensing with light and sound
Boracay Island to be closed to tourists - Philippines
Drop in plastic bags littering British seas linked to introduction of 5p charge
Bowhead whales: jazz artists of the deep whose calls rival birdsong
49,188 Divers collect 307,064 kg debris from ocean
Thousands of divers have participated in Dive Against Debris in more than 50 countries around the world, reporting over 900,000 pieces of rubbish
Underwater Australia: The Best Dive Sites Down Under
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Photo credits: Tim Nicholson, Andrew Reay-Robinson
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