Larval development and settlement of a whale barnacle

Larval development and settlement of whale barnacles have not previously been described, unlike intertidal barnacles. Indeed, the mechanisms of the association between barnacles and whales have not been studied. Here we describe the larval development and settlement of the whale barnacle, Coronula d...

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Bibliographic Details
Published in:Biology Letters
Main Authors: Nogata, Yasuyuki, Matsumura, Kiyotaka
Format: Article in Journal/Newspaper
Language:English
Published: The Royal Society 2005
Subjects:
Online Access:http://dx.doi.org/10.1098/rsbl.2005.0409
https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2005.0409
https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2005.0409
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Summary:Larval development and settlement of whale barnacles have not previously been described, unlike intertidal barnacles. Indeed, the mechanisms of the association between barnacles and whales have not been studied. Here we describe the larval development and settlement of the whale barnacle, Coronula diadema , and possible involvement of a cue from the host in inducing larval settlement. Eight-cell stage embryos were collected from C. diadema on a stranded humpback whale, incubated in filtered seawater for 7 days, and nauplius larvae hatched out. When fed with Chaetoceros gracilis , the nauplii developed to stage VI, and finally metamorphosed to the cypris stage. The larval development looked similar to that of intertidal barnacles with planktotrophic larval stages. The cyprids did not settle in normal seawater, but did settle in polystyrene Petri dishes when incubated in seawater with a small piece of skin tissue from the host whale. This strongly suggests the involvement of a chemical cue from the host whale tissue to induce larval settlement.