UNDERWATER BAHAMAS: REEF GARDENS (3)


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UNDERWATER BAHAMAS: REEF GARDENS (3)

We are back in the realm of ‘animal, vegetable or mineral?’. Dive down a few feet – inches, even – to the reef, and… is this thing waving about here a plant or a creature? And is that colourful lump over there a bit of inanimate rock or a living thing?

1. FEATHER DUSTERS 

Not in fact pretty frilly-fringed plants, but worms among the coral. The tiny electric blue fish are Blue Chromis, ubiquitous around the reefs.Feather Duster © Melinda Riger @ Grand Bahama Scuba

Here the feather dusters have attached themselves to a sea fan, a ‘gorgonian’ coralFeather Dusters & Sea Fan © Melinda Riger @ Grand Bahama Scuba

Moored on part of an old wreckFeatherdusters ©Melida Riger @ G B  Scub

A different form of duster with remarkable feathered tentaclesFeather Duster ©Melinda Riger @ G B Scuba

2. BASKET STARS Creatures in the same family group as brittle stars. Take a close look at the remarkable transformation in the two photographs. The top image is taken in daylight. The star is off duty and enjoying some downtime. However the second image is the same view at night, with the star fully open and waiting to harvest whatever micro-morsels come its way. The star has truly ‘come out at night’.

Basket Star (day) ©Melinda Riger @ GB Scuba Basket Star (night) ©Melinda Riger @ GB Scuba

3. CORKY SEA FINGER Another form of gorgonian coral, sometimes known as dead man’s fingers… **

Corky Sea Finger (Polyps extended) ©Melinda Riger @ G B Scuba

4. GOLDEN ZOANTHIDS Coral forms living on a Green Rope Sponge. Some zoanthids contain a deadly poisin called palytoxin, which may do unspeakable things to your heart. Like stop it. Luckily, none so unpleasant live in the Bahamas (or so the Bahamian Tourist Board would no doubt wish me to make clear).

Golden Zoanthids on green rope sponge ©Melinda Riger @ G B ScubaI realise that calling this occasional series ‘Reef Gardens’ is a bit of a misnomer. They are in fact Reef Zoos. The previous posts are as follows:

REEF GARDENS 1 Anemones, Basket Stars & Christmas Trees

REEF GARDENS 2 (Corals)

Image credits, with thanks: Melinda Riger @ Grand Bahama Scuba

** I knew this image reminded me of something… or someone. And (superannuated British rockers out there), is it not exactly like the hairdo of one of the guys in Mott the Hoople, a band lifted from relative obscurity to fame by being gifted a song by David Bowie? Guitarist. Ian Hunter. Take a look at him now… and just imagine then

ian_hunter_of_mott_the_hoople_performing_at_the_hammersmith_apollo_as_part_of_the_band's_40th_anniversary_reunion_tour_5363650

UNDERWATER BAHAMAS: REEF GARDENS (2) – CORALS


Purple Seafan Coral ©Melinda Riger @GBS

UNDERWATER REEF GARDENS IN THE BAHAMAS (2): CORALS

This is part 2 of a series that started out HERE with a selection of anemones, basket stars and Christmas tree worms. The images below show a wide variety of corals. In among them are also sponges and anemones. These photos are evidence of a healthy reef environment in the waters of the northern Bahamas. Abaco’s coral reef is the third largest barrier reef in the world (yes, I hear you – the Great Barrier… And the second is???), providing wonderful and accessible diving / snorkelling opportunities. However, monitoring shows that the incidence of coral bleaching and disease is increasing in the Bahamas, as elsewhere in the world.  It’s a sobering thought that your grandchildren may never swim in an environment with any of the living corals shown below…

Corals ©Melinda Riger @ G B ScubaCoral ©Melida Riger @ G B  ScubaCoral ©Melinda Riger @ G B Scuba 1Coral ©Melinda Riger @ G B Scuba 2Coral ©Melinda Riger @GBSImage Credits: ©Melinda Riger @ Grand Bahama Scuba

ABACO FROM SPACE: NASA / ISS VIEWS 225 MILES ABOVE THE BLUE PLANET


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ABACO FROM SPACE:  NASA  /  ISS VIEWS 225 MILES ABOVE THE BLUE PLANET

I have had another look through NASA‘s stock of Bahamas images taken from the INTERNATIONAL SPACE STATION. They come in differing formats. Over time the Station’s orbit takes it directly over or close to Abaco. In the past I have posted images of Hurricane Irene and Hurricane Sandy taken from space; and one of the astonishing Bahama variations of the colour BLUE. Here is a further selection.

The first two images show an orbit from north to south. I have annotated the first for those unfamiliar with the geography of Abaco. I assume the next was taken only a second or two later, with the whole of the southern tip / National Park / Hole-in-the-Wall area of Abaco now shown.

Abaco Map NASA:ISSA annotated STS060-84-33

This image gives an idea of the underwater connection between the island land masses. Here, a corrugated underwater sequence of ridges and troughs can be seen linking the southern end of Abaco with the south western end of Grand Bahama. Moore’s Island and, barely visible below it, Gorda (‘Castaway’) Cay rise above sea level between the two larger islands. The Berry Is. and Great Harbour Cay can be seen bottom left; Eleuthera snakes downwards bottom right. [At Rick Guest's suggestion, I have rotated the image 90˚ from the original to make sense of a view distorted by angle (the space station's), earth curvature and my own misinterpretation... It makes far more sense now, and I have corrected geographic errors accordingly... I've also added an annotated aeroplane's-eye view below it, taken from much closer to the earth and therefore less subject to distortion. Many thanks, Rick]STS108-724-71 copyAbaco Map  - Island relationships

Abaco seen from the southeast. Little Abaco and Grand Bahama are at the top, and all are shown inter-connected underwater. The reef chain of the Abaco Cays – the world’s third longest barrier reef – can clearly be seen on the rightISS017-E-12812

This image appears to be a blow-up of the sharper ‘filmic’ second one above. The detail has become hazy and indistinct, though part of the island-long ribbon of highway remains clearly visible. Time for a photo-enhancing experiment…
NASA clip

I played around with the contrast and colour settings of the photo above, to see what effect it produced (below). The most marked result is that areas of low water  – the coastline, the underwater high ground, the Marls and mangrove swamps, the low water of Cherokee Sound – became vividly highlighted. I don’t know what the small russet patches are, particularly visible in the Marls. My (ill-)educated guess is that they represent mangrove / mud islands that are underwater at high tide only, and that were in tidal transition as the Space Station passed overhead. Any ideas welcomed via the comment box.NASA clip - Version 2