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Determination of Growth and Age of Slow Growing Brittle Stars (Echinodermata: Ophiuroidea) From Natural Growth Bands

Published online by Cambridge University Press:  11 May 2009

Corinna Dahm
Affiliation:
Alfred Wegener Institute for Polar and Marine Research, PO 120161, D-27515 Bremerhaven, Germany. E-mail: cdahm@awi-bremerhaven.de
Thomas Brey
Affiliation:
Alfred Wegener Institute for Polar and Marine Research, PO 120161, D-27515 Bremerhaven, Germany. E-mail: cdahm@awi-bremerhaven.de

Extract

Growth in ophiuroids is highly variable, and with increasing size and age of an ophiuroid specimen more and more of the innermost growth rings on the vertebral ossicles become overgrown and hence invisible. Two approaches to estimate individual age of slow growing brittle stars using the high Antarctic species Ophionotus victoriae are compared. One method interprets natural growth ring readings as size-increment data, whereas the second method compensates for growth ring overgrowth by means of an iterative corrective approach. Preconditions as well as advantages and disadvantages of both methods are discussed.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1998

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