Detailed visual seabed survey at drilling site 7218/11-1
Detailed visual seabed survey at drilling site 7218/11-1
Detailed visual seabed survey at drilling site 7218/11-1
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Figure <strong>11</strong>. General structure of a hypothetical sponge. Figure from University of Berkeley<br />
(http://www.ucmp.berkeley.edu/porifera/poriferamm.html ).<br />
Insidethe spongeis a densem<strong>at</strong>rix of spicules,whichform a skeletonto allow the animalto retain its<br />
shape (Figure 12). Thesespiculesare of siliceousand/or calcareousm<strong>at</strong>erial, dependingon the<br />
group.<br />
Figure 12. Scanning electron microscope (SEM) image of sponge spicules. Image from<br />
http://www.ucmp.berkeley.edu/porifera/porskel.html.<br />
Sponges,like many large sessile (non-moving) organisms,act as habit<strong>at</strong> for other organisms.<br />
Individualspongescan give shelter to for examplesmallcrustaceansand bristleworms(Figure13).<br />
<strong>Detailed</strong> <strong>site</strong> <strong>survey</strong> <strong>at</strong> PL531 Darwin<br />
Akvaplan-niva AS Rapport 6051 - 1 17
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