Download (3398Kb) - ePrints Soton - University of Southampton
Download (3398Kb) - ePrints Soton - University of Southampton
Download (3398Kb) - ePrints Soton - University of Southampton
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Fig. 4.7. Hierarchical cluster analysis <strong>of</strong> the data on adult size, egg size and Gonad<br />
Index, based on the Normalized Euclidean distance measure.<br />
Group B contains 17 species, which present large adult size (major radius 100-200<br />
mm), large egg size (diameters from 470 to 1182 µm), and low Gonad Index (3.17 to<br />
6.4).<br />
Four species with small egg size were included in this cluster. This occurred<br />
because the analysis considered them similar to the other species in having a large<br />
adult size and low Gonad Index; however it is evident that two <strong>of</strong> these species:<br />
Stichastrella rosea (O.F. Müller) and Astropecten irregularis (Pennant) clearly belong<br />
to a group <strong>of</strong> shallow-water species with small egg size, high fecundity and<br />
planktotrophic development together with Luidia sarsi Düben and Koren, which was<br />
separated by the analysis as an outlier because <strong>of</strong> its very high Gonad Index. These<br />
three species are found in the upper slope zone at 150-700 m, as defined by Howell et<br />
al. (2002).<br />
79