Re: Chromodoris collingwoodi feeding observations

June 21, 2007
From: Bruce Wilkie

Concerning message #19356:

Hi Bill,
Here is another feeding record of Chromodoris collingwoodi for the forum.

Locality: Flat rock, Point lookout, Nth Stradbroke island, 12mts, Queensland, Australia. , Pacific ocean., 30 May 2007, Rocky reef, hard and soft corals, sponges.. Length: 30mm. Photographer: Bruce Wilkie

Many thanks,
Bruce Wilkie.

brucedwilkie@yahoo.com.au

Wilkie, B, 2007 (Jun 21) Re: Chromodoris collingwoodi feeding observations. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20008

Dear Bruce,
Thanks very much. As you know, my chromodorid  feeding review is due to be published any day now, but I knew that it would only be 'part 1' because I have at least 5 new records to add and now yours. Publication is always an interesting stage in research because now the world can test your hypotheses and observations. Until now, the only sponge genera we have found C. collingwoodi eating is Dictyodendrilla, and this appears to be what they are eating in your photos.

In the photo alongside we can see that both animals are quite far apart but the close-ups above show they are both feeding on the same sponge. This again illustrates how huge sponge colonies can be almost completely covered or obscured by algal growths, hydroids and other animals, making prey identification of sponge-feeding nudibranchs very difficult. Thanks Bruce for your diligent searching, it is helping to fill in many gaps in our knowledge.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Jun 21). Comment on Re: Chromodoris collingwoodi feeding observations by Bruce Wilkie. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20008

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