Order corallinales includes the three main geniculate [articulated]




Дата канвертавання26.04.2016
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RHODOPHYTA
ORDER CORALLINALES (includes the three main geniculate [articulated]

calcareous species and several non-geniculates or encrusting species)


1. Haliptilon cubense (formerly known as Corallina cubensis)
Comment: Currently the most common species in the mesocosm, which is an

interesting fact in itself because it is not known to grow so abundantly

in other mesocosms, according to Walter Adey. Or in the wild where it is

considered uncommon and inconspicuous, growing epiphytically on larger

algae or forming dense turfs on hard substrates. It is forming a dense

turf in the B2 ocean that apparently is most favored by conditions

there and is spreading. What are these conditions? Or to ask it another

way, what is it about this species that makes it able to thrive there?


2. Amphiroa fragilissima
Comment: Formerly the dominant species and is commonly the dominant

species in closed systems. Has risen and fallen in abundance

and is now relatively reduced in biomass. Like Haliptilon c. it bleaches

out in the summer though it is not known yet whether it still increases

its biomass when in this condition.
3. Amphiroa rigida
Uncommon compared to Amphiroa f. It does not seem to bleach out like the

first two species. Found to only a depth of 1 meter in the wild.


4. Mesophyllum mesomorphum
A common, heavily calcified encrusting alga in artificial systems. In B2

it appears more pink than its usual darker red color.


5. Hydrolithon boergesenii
Another common, heavily calcified encrusting alga that is lavender in

color.
6. Porolithon pachydernum


A very common crustose alga often covering extensive areas on wild reefs.

Chalky pink in appearance.


VARIOUS OTHER RHODOPHYTA
7. Peyssonnelia sp. (possibly Ethelia sp.)
A crustose specimen from one of these difficult-to-identify genera, which

include species that are non-calcareous or only lightly calcified. Needs

to be sectioned and examined microscopically even to confirm genus.
8. Chondria dasyphylla
The common "red fleshy" in the ocean mesocosm that forms loose, reddish

mats. Incorrectly thought to be a Hypnea. Identified by the tuft of

trichoblasts at the apical tip of branchlets. Its morphology, like that

of several species from the mesocosm, is different from that seen in the

wild. In this case, the branches are thinner and more densely packed.

Though found near the surface it does not tend to bleach as readily as the

other branching reds.
9. Gelidiopsis intricata
The other "red fleshy" thought to be a Hypnea, which was ruled out by

the uniform cell size seen in transverse sections of its branches viewed

under a microscope at 40X. It forms tough, wiry mats that tend to be

found deeper in the mesocosm. Like Amphiroa and Haliptilon, it tends to

bleach in the summer. Uncommon in the wild. Forms mats on mangrove roots.
10. Acanthophora spicefera
Spindly, pale brown branches with short spiny branchlets. In the wild, a

common early colonizer on dead coral fragments.


11. Botryocladia sp.
Has characteristic bulbous red blades filled with clear mucalaginous gel.

Our specimen was only a branch and without the whole plant the species

could not be identified.
12. Rhodogorgon carriebowensis
One of the most unusual species in the mesocosm--or in the wild, for that

matter. Called a "mystery organism" only a few years ago, it now has its

own genus, family and order. Only one individual is growing in the

tank. It is a tough, leathery, slick, naked-looking pinkish white

branching thallus about 30 cm in height. It calcifies around specialized

internal cells.


CHLOROPHYTA
13. Halimeda goreaui
A common calcareous green alga in the wild, it is represented by a few

scattered individuals in the mesocosm.


14. Halimeda tuna
Another common calcareous species. Noted for its prickly pear cactus-like

structure.


15. Caulerpa serrulata
One of the many branching Caulerpas, this one is actually uncommon in the

wild.
16. Rhipocephulus phoenix


One of the common, easily recognized green algae with a compact cap on a

stem. R. phoenix has an oval cap and grows to about 10 cm in height.


17. Valonia macrophysa
Valonia m. is also easily recognized by its tightly packed cluster of

thick, olive green, transparent branches resembling tiny balloons.


18. Valonia utricularis
An uncommon Valonia having longer, club-like branches.
19. Dictyosphaeria cavernosa
Forms hollow, globular masses made up of one layer of large (3 mm) cells.
20. Dictysphaeria ocellata
Another common Dictyosphaeria that forms dense mounds with longer

rhizoids.


PHAEOPHYTA
21. Dictyota pulchella
The sole brown alga collected.

NOTE: No doubt some species were missed, especially among the greens and

browns. It is probable that another 5 to 10 species could be collected

with a more intensive effort. Soon such an effort will be made. Also, a



photographic survey will be completed and a map of the microhabitat types

across the bottom of the mesocosm will be drawn up.


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