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Title: New body metrics to determine asteroid size and weight directly in the field
Authors: Gianguzza, Paola
Trapani, Francesco di
Bonaviri, Chiara
Visconti, Giulia
Deidun, Alan
Badalamenti, Fabio
Keywords: Starfishes -- Mediterranean Sea
Marine ecology -- Mediterranean Sea
Issue Date: 2015
Publisher: Universidade de Vigo * Servizo de Publicacions
Citation: Gianguzza, P., Di Trapani, F., Bonaviri, C., Visconti, G., Deidun, A., & Badalamenti, F. (2015). New body metrics to determine asteroid size and weight directly in the field. Thalassas, 31(1), 73-82.
Abstract: Asteroids are an important group of predators in many marine ecosystems. The measure of body size is crucial in studying asteroid biology as this variable affects both prey selection and predation impact. Current field techniques for estimating asteroid size (i.e. total length TL, total weight TW) include the measure of correlated variables, such us the central disk (CD) and arm length (AL). However, these variables are often time-consuming and require a direct handling of the organism. We tested the accuracy of new asteroid body metrics, the arm height (AH) or arm width (AW), to rapidly estimate body size in asteroids. AH and AW were measured in three of the most common Mediterranean asteroids (Marthasterias glacialis, Ophidiaster ophidianus and Coscinasterias tenuispina), sampled from April to August 2008, along the coasts of Ustica Island off the northern coast of Sicily. We used both linear and exponential regression analyses to compare the performance of AH, AL, AW and CD in estimat- ing size for the three species studied. Results suggest that, in M. glacialis and C. tenuispina, AH is strongly correlated (p<0.001) with both TL and TW, whereas in O. ophidianus it gives a good correlation (p<0.001) with TW only. AW was poorly correlated with both TL and TW in M. glacialis and C. tenuispina, but not in O. ophidianus, where it showed the highest correlation with TW. Thus, only the novel AH measure constitutes a convenient and reliable way of measuring asteroid body size in the field.
ISSN: 02125919
Appears in Collections:Scholarly Works - FacSciGeo

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