A study on the growth of the unstalked crinoid Heliometra glacialis (Owen 1833 ex Leach MS) (Echinodermata, Crinoidea) based on ring-shaped bands formed in the brachials

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The growth of the unstalked crinoid Heliometra glacialis was studied based on material from the northwestern part of the Barents Sea near the Svalbard Archipelago. The calculation of the crinoid age was performed using ring-shaped markings in the their brachials. The growth rings visible on the surface of the crinoid brachials were considered as annual. The most suitable mathematical model describing the growth of H. glacialis was the Gompertz equation. The averaged limiting radius of the brachials (R∞), according to this equation, was 1694 ± 119 microns, the exponential deceleration constant of the specific growth rate (g) amounted to 0.41 ± 0.04, and the maximum lifespan to 12–18 years.

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Sobre autores

E. Stratanenko

Zoological Institute, Russian Academy of Sciences

Autor responsável pela correspondência
Email: E.Stratanenko@mail.ru
Rússia, St. Petersburg, 199034

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2. Fig. 1. Vertebrae of the rays of the ophiuros (A) and the brachial plate of the sea lily (B).

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3. Fig. 2. Research area: 1 – sampling site of Heliometra glacialis (Owen 1833 ex Leach MS).

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4. Fig. 3. Brachial plate of the sea lily Heliometra glacialis (Owen 1833 ex Leach MS): A – general view of the brachial plate (1 – aboral cavity, 2 – middle lateral cavity, 3 – oral lateral cavity); B – structure of the aboral and middle lateral cavity; C – structure of the oral lateral cavity; D – growth lines on the oral lateral cavity and the radius of the brachial plate (R), along which the growth marks were measured.

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5. Fig. 4. Maximum lifespan of Heliometra glacialis (Owen 1833 ex Leach MS), calculated for the studied sample from the Barents Sea based on the minimum value of the second derivative based on the parameters of the Bertalanffy (A) and Gompertz (B) equations: 1 – plotted based on the average values ​​of individual growth parameters, 2 – plotted based on the group growth parameters. The abscissa shows the lifespan in years; the ordinate – the second derivative.

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