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Title of Journal: Coral Reefs

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Abbravation: Coral Reefs

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Springer-Verlag

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DOI

10.1007/s10940-004-1789-0

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1432-0975

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Skeletal morphogenesis and growth mode of modern a

Authors: S U Noé WChr Dullo
Publish Date: 2006/04/14
Volume: 25, Issue: 3, Pages: 303-320
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Abstract

Fabric and growth mode of deepwater isidid gorgonian skeletons showing bright Mgcalcitic internodes and dark proteinageous nodes were investigated on modern subrecent and fossil skeletons The internodial microstructure is characterised by threedimensionally interfingering calcitic fascicles accreting around a central axis Macroscopic colour banding results from varying orientations of organicrich fascicle bundles and intercalated bands of organicpoor granular crystals This skeletal structure of isidid gorgonians strikingly differs from the density banding of scleractinians Radiocarbon dating of a fossil skeleton gave an age of 3985±35 to 3680±35 years before present BP with a record of 305±35 years ±range Linear extension rates of 04 mm year−1 average allow for an annual to subannual resolution on micrometer scale of colour bands or fascicles respectively The growth mode of branched skeletons is characterised by simultaneous secretion of vertically alternating nodes/internodes and lateral accretion of concentric increments enveloping the entire skeleton Bifurcations at various growth stages imply that adjacent branches have different ages and show varying numbers of growth bands at any skeletal cross section The scleroprotein gorgonin plays a crucial role in the formation of organic nodes and the secretion of calcitic internodes by providing a structural framework in the biomineralisation processWe want to acknowledge the German Research Foundation DFG for substantial support through the Leibniz award Du 129/33 the German Federal Ministry of Education and Science BMBF for the SO168 and SO178 grants and the Ministry for Industry Science and Technology of the Russian Federation for the LV29 grant We are indebted to Prof Dr PM Grootes Leibniz Labor for Age Determination and Isotope Research Kiel for 14C measurements Dr B Bader and U Schuldt Department of Geosciences CAU Kiel for their support in the SEM lab and D Dettmar Bochum for thin section preparation Two anonymous reviewers helped to improve the manuscript

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  2. “Locally extinct” coral species Seriatopora hystrix found at upper mesophotic depths in Okinawa
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  7. Do no-take reserves benefit Florida’s corals? 14 years of change and stasis in the Florida Keys National Marine Sanctuary
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  11. Climate change and coral reefs: Trojan horse or false prophecy?
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  15. Effect of ocean warming and acidification on the early life stages of subtropical Acropora spicifera
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