However, it is demonstrated that biological stressors, specifically poriferan
abundance in close proximity (one-meter radius of coral head), have a negative effect on coral health.
Shale biovolume was dominated by arthropods, with poriferans, echinoderms and priapulids following.
They suggest that Cambrian tropical mudflats favored the adaptive radiation of two deeply different groups: the highly vagile and complex arthropods and the sessile and simpler poriferans. Why arthropods were so obviously replaced as dominant members of the community by polychaetes (with vagile and sessile taxa) deserves attention in the future (see Fauchald 1975).
The poriferans showed no significant differences in their P contents, with values close to 0.43% d.w.
The poriferans showed slight differences in their carbohydrate contents (P < 0.01), which were close to 5% dw.
heliophila (with 7.95% dw) had the highest lipid concentrations for cnidarians and poriferans respectively.
The poriferans showed a very similar pattern of amino acids, except for proline (higher values in D.
Poriferan larvae are considered to be even more simply constructed than planulae in that they lack neurons.
We have deposited a voucher specimen and photograph in the Poriferan Collection in the Queensland Museum (QM G315611).