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The occurrence of corallimorpharians (naked corals). Daphne G. Fautin Department of Ecology and Evolutionary Biology and Natural History Museum University of Kansas Lawrence, Kansas 66045, USA John M. Guinotte Marine Conservation Biology Institute 2122 112th Ave NE, Suite B-300

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The occurrence of corallimorpharians naked corals

The occurrence of corallimorpharians (naked corals)

Daphne G. Fautin

Department of Ecology and Evolutionary Biology

and Natural History Museum

University of Kansas

Lawrence, Kansas 66045, USA

John M. Guinotte

Marine Conservation Biology Institute

2122 112th Ave NE, Suite B-300

Bellevue, Washington 98004, USA



Diversity
DIVERSITY

  • 1631 valid species of Scleractinia

  • 55 valid species of Corallimorpharia

  • 1112 valid species of Actiniaria

  • Members of all taxa occur throughout the world’s oceans



to compare the depth distribution of deep-sea corallimorpharians with that of deep-sea scleractinians

OBJECTIVE

to infer if CaCO3 concentration may be relevant to the occurrence of these animals that are so similar except for the skeleton


http://hercules.kgs.ku.edu/Hexacoral/Anemone2 corallimorpharians with that of deep-sea scleractinians

DATA:general surveys rather than those for the target organisms


The corallimorpharians with that of deep-sea scleractiniansChallenger Expedition

and US Antarctic Program


Challenger
Challenger corallimorpharians with that of deep-sea scleractinians

ScleractiniaCorallimorpharia

Species98 (91 to species) 3

(in 41 genera) (All Corallimorphus)

Stations 70 6

(Both occurred at 3 stations)

Depth range 18-5304 m 2515-3950 m

Average depth 1439 m 3142 m

p = 0.000201 t-test 1-tailed, unequal variance


Antarctic
Antarctic corallimorpharians with that of deep-sea scleractinians

ScleractiniaCorallimorpharia

Species38 (37 to species) 2

(in 19 genera) (Both Corallimorphus)

Stations 190 12

(Both occurred at 8 stations)

Depth range 9-4840 m 132-4410 m

Average depth 676 m 1600 m

p = 0.019613 t-test 1-tailed, unequal variance


Comparisons between antarctic and challenger data
COMPARISONS between Antarctic and Challenger data corallimorpharians with that of deep-sea scleractinians

  • Antarctic lower diversity in both taxa

  • Twice as many stations in Antarctic

  • Average Antarctic depth about half that of Challenger for both taxa

  • In Antarctica, depth range of Scleractinia slightly shallower, that of Corallimorpharia considerably shallower and deeper

Yet average depth of corallimorpharians significantly deeper in both datasets


Caco 3 concentration proportion deeper than aragonite saturation horizon 1995
CaCO corallimorpharians with that of deep-sea scleractinians3 concentration:proportion deeper than aragonite saturation horizon (1995)

ScleractiniaCorallimorpharia

Challenger

stations 18/40 (45%) 5/5 (100%)

species 19/98 (19%) 3/3 (100%)

(in 10/41 genera)

Antarctic

stations 29/122 (24%) 5/10 (50%)

species 16/38 (42%) 2/2 (100%)

(in 9/19 genera)


Implications
IMPLICATIONS corallimorpharians with that of deep-sea scleractinians

“Polyp bail-out”: under stress (including in aquaria), scleractinians can crawl out of their skeletons.

Fine and Tchernov. 2007. Science.

Scleractinian coral species survive and recover from decalcification.

These “naked” polyps are indistinguishable from corallimorpharians


Implications1
IMPLICATIONS corallimorpharians with that of deep-sea scleractinians


The future
THE FUTURE?? corallimorpharians with that of deep-sea scleractinians

More corallimorpharian species

and/or

Shallower scleractinians


Acknowledgments
ACKNOWLEDGMENTS corallimorpharians with that of deep-sea scleractinians

  • Funding was provided by US National Science Foundation grants DEB95-21819 and DEB99-78106 (in the program PEET - Partnerships to Enhance Expertise in Taxonomy), grant OCE 00-03970, and grant EF-0531779 (in the program Assembling the Tree of Life).

  • Sukeerthi Bokka for assembling data

  • Matthew Jones for photo of corallimorpharian

  • James C Orr for CaCO3 concentration data


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