Section 36
Chapter 35,425

On natural metamorphosis inducers of the cnidarians Hydractinia echinata and Aurelia aurita

Kroiher, M.; Berking, S.

Helgoland Marine Research 53(2): 118-121


ISSN/ISBN: 1438-387X
Accession: 035424712

Download citation:  

Hydractinia echinata and Aurelia aurita produce motile larvae which undergo metamorphosis to sessile polyps when induced by external cues. The polyps are found at restricted sites, A. aurita predominantly on rocks close to the shore, H. echinata on shells inhabited by hermit crabs. It has been argued that the differential distribution of the polyps in their natural environment largely reflects the distribution of the natural metamorphosis-inducing cues. In the case of H. echinata, bacteria of the genus Alteromonas were argued to meet these conditions. We found that almost all substrates collected in the littoral to induce metamorphosis in H. echinata, and several bacterial strains isolated from the sea, including the common E. coli, induce metamorphosis efficiently. In A. aurita metamorphosis may be induced by the water-air interface, whereby metamorphosis precedes (final) settlement.

PDF emailed within 1 workday: $29.90