Re: chloroplast symbiosis in Norway

March 10, 1999
From: Cynthia Trowbridge

Dear Jussi Evertsen,

I have read with much interest your messages about Elysia in Norway. I just spent almost two years studying Elysia viridis and Placida dendritica on Scottish rocky shores. Also, I even visited the Trondheim Biological Station in September 1998 before returning to Oregon (USA). I wished that I had met you during my visit.

With respect to Elysia, historically it fed on the filamentous green alga Cladophora rupestris (main host on Scottish shores)and the coenocytic green alga Codium tomentosum (rare on Scottish shores). Kathe Jensen has reported the slug eating Chaetomorpha linum in her J. Moll. Stud. paper in 1989.

Anyway, after the introduction of Codium fragile ssp. tomnentosoides to Scottish shores (1953), Elysia viridis primarily uses this alga as a host plant. The alga appeared on the shores of mainland Europe several decades earlier and the slug eats presently eats it.

In terms of references, I have written 2 manuscripts (about to be submitted) and then two recent papers that also include details about Elysia and Placida that may be of interest:

Trowbridge (1998) J. Exp. Mar. Biol. Ecol. 230: 31-53.
Trowbridge (1998) Oceanogr. Mar. Biol. Ann. Rev. 36:1-64. (despite its algal title, there is quite a bit of slug info).

You might also check for the January 1999 issue of American Zoologist where I have a published abstract on Elysia viridis.

I would be keen to hear more about your research. Thanks!

Cynthia Trowbridge
Research Assistant Professor
Oregon State University

trowbric@ucs.orst.edu

Trowbridge, C., 1999 (Mar 10) Re: chloroplast symbiosis in Norway. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/666

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