Chromodoris annulata - population, natural history

June 2, 2003
From: Kathrin Lüttmann

Hi Bill,
First of all: thank's for this web site! I have found a lot of infos I needed!!!!
I'm a German biology student and I just arrived back from a field trip to Egypt with a marine biology course.
I have been working on a project with Chromodoris annulata. Our location, or rather our observing area, was an intertidal zone sourrounded by a few mangroves in Mangrove Bay, Sinai, Egypt.

So my question now is: Is there any information on population size on slugs at all or especially on C. annulata? Are they more active during the night or during the day? - How come we found most of them in an intertidal zone, but still you find them in depths up to 20m? - What we found at Mangrove Bay was, that they seem to hide during high tide and come out at low tide. Do you think they prefer hot water temperatures? We even found one slug totally out of the water!

I would be very happy if you would find some time and some ideas to answer my questions. Thank you,
Kathrin

Kathrin.luettmann@gmx.de

Dear Kathrin,
The only study I know of on C. annulata is Gohar & Aboul-Ela's (1957) which gives some background information and compares the species with two other yellow-spotted species. [See message about this paper]. There has been quite a lot of work done on nudibranch populations, but much of it has been on temperate species. Have a look at Thompson & Brown, (1984) for a good source of references on the topic - though there are many more to add to their bibliography. Two very relevant papers are those by Scott Johnson I list below on tropical distributions.

• Gohar, H. A. F., & I. A. Aboul-Ela. 1957a. The development of three chromodorids (with the description of a new species). Publications of the Marine Biological Station, Al-Ghardaqa, Egypt, 9: 203-228, pls. 1-5.
• Johnson, S. (1983) Distribution of two nudibranch species on a subtidal reef on the western shore of Oahu, Hawaii. The Veliger, 25(4): 356-364.
• Johnson, S. (1989) Temporal patterns of nudibranch mollusk activity on a subtidal Hawaiian reef. The Veliger, 32(1): 1-7.

Hope this is will be of some use,
Bill Rudman

Rudman, W.B., 2003 (Jun 2). Comment on Chromodoris annulata - population, natural history by Kathrin Lüttmann. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/10073

Factsheet

Chromodoris annulata

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