University of Oregon

Cynthia D. Trowbridge

Senior Research Associate


B.A. Biological Sciences, Cornell University
Ph.D. Zoology, Oregon State University


Mail:   OIMB, P.O. Box 5389, Charleston, OR 97420 (institutional)
P.O. Box 1995, Newport, OR 97365 (home)
Phone:   (541) 961-0643
Fax:   (541) 888-3250

Graduate Students

Given the nature of my OIMB appointment, I cannot accept MS or PhD students.


Seaweed Ecology (BI 457/557)

details coming soon

Selected Publications

Books & DVDs

Little, C. & Trowbridge, C.D. 2013. A brief introduction to the organisms that live in Lough Hyne (and what the scientists know about them). Pp. 162-181 in: Lough Hyne: From Pre-History to the Present. Kearney, T. Macalla Publishing, Skibbereen, Ireland.

Little, C., Williams, G.A., & Trowbridge, C.D. 2009. The Biology of Rocky Shores, 2nd Edition, Oxford University Press,

Trowbridge, C.D. 2006. A global proliferation of non-native marine and brackish macroalgae. Invited 91-page chapter in: World Seaweed Resources—An Authoritative Reference System. DVD-ROM, version 1.0. Critchley, A.T., Ohno, M., & Largo, D.B. (eds.). ETI Bioinformatics, Amsterdam.  


Rocky shorebook4bc641f090

Lough Hyne book 2013

Review Papers

Krug, P.J., Vendetti, J.E., Ellingson, R.E., Trowbridge, C.D., Hirano, Y.M., Trathen, D.Y., Rodriguez, A.K.,  Swennen, C., Wilson, N.G., & Valdés, A.A. Species selection favors dispersive life histories in sea slugs, but higher per-offspring investment drives shifts to short-lived larvae. Syst. Biol.

Trowbridge, C.D. 1998. Ecology of the green macroalga Codium fragile (Suringar) Hariot 1889: invasive and non-invasive subspecies. Oceanogr. Mar. Biol. Ann. Rev. 36: 1-64.

Trowbridge, C.D. 1999. An assessment of the potential spread and options for control of the introduced green macroalga Codium fragile ssp. tomentosoides on Australian shores. Consultancy report, CSIRO/Centre for Research on Introduced Marine Pests: Hobart.

Trowbridge, C.D. 2002. Northeastern Pacific sacoglossan opisthobranchs: natural history review, bibliography, and prospectus. Veliger 45: 1-24.

Trowbridge, C.D., Hirano, Y.M., & Hirano, Y.J. 2011. Inventory of Japanese sacoglossan opisthobranchs: Historical review, current records, and unresolved issues. Am. Malacol. Bull. 29: 1-22.

Journal Papers


Hirano, Y.M., Trowbridge, C.D. & Hirano, Y.J. 2013. Endophytophagy—a remarkable mode of feeding. Venus 71: 212–216.

Takano, T., Hirano, Y.M., Trowbridge, C.D., Hirano, Y.J., & Watano, Y. 2013. Taxonomic clarification in the genus Elysia (Gastropoda, Sacoglossa): E. atroviridis and E. setoensis. Am. Malacol. Bull. 31(1): 25–37.

Trowbridge, C.D., Hirano, Y.J., & Hirano, Y.M. 2010 [for 2008]. Sacoglossan opisthobranchs on northwestern Pacific shores: Stiliger berghi Baba, 1937, and Elysia sp. on filamentous red algae. Veliger 51: 43-62.

Trowbridge, C.D., Hirano, Y.M., Hirano, Y.J., Nishida, K., & Sudo, K. 2011. North-west Pacific sacoglossan guild associated with filamentous green algae (Family Cladophoraceae and Family Boodleaceae). Mar. Biodivers. Rec. doi:10.1017/S1755267211000170.

Trowbridge, C.D., Hirano, Y.M., Hirano, Y.J., Sudo, K., Shimadu, Y., Watanabe, T., Yorifuji, M., Maeda, T., Anetai, Y., & Kumagai, K. 2010. Subtropical sacoglossans in Okinawa—at “special risk” or “predictably rare”? Am. Malacol. Bull. 28: 167-182.

Yamamoto, S., Hirano, Y.M., Hirano, Y.J., Trowbridge, C.D., Akimoto, A., Sakai, A., & Yusa, Y. 2013. Effects of photosynthesis on the survival and weight retention of two kleptoplastic sacoglossan opisthobranchs. J. Mar. Biol. Assoc., U.K. 93: 209–215. doi:10.1017/S0025315412000628.

Vendetti, J.E., Trowbridge, C.D. & Krug, P.J. 2012. Poecilogony and population genetic structure in Elysia pusilla (Heterobranchia: Sacoglossa), and reproductive data for five sacoglossans that express dimorphisms in larval development. Int. Comp. Biol., pp. 1–13. doi:10.1093/icb/ics077.


Jiorle, R.P., Trowbridge, C.D., & McAllen, R. 2016. Benthic fish guilds in the shallow sublittoral zone of Lough Hyne, Co. Cork, Ireland. Roy. Ir. Acad. 116B: 1-9.

Little, C., Pilling, G.M., Trowbridge, C.D. & Stirling, P. 2012. Osilinus lineatus: Incursion and proliferation in Lough Hyne Marine Reserve, SW Ireland. Am. Malacol. Bull. 30: 135–145.

Trowbridge, C.D., Little, C., Dlouhy-Massengale, B., Stirling, P. & Pilling, G.M. 2013. Changes in brown seaweed distributions in Lough Hyne, SW Ireland: a long-term perspective. Bot. Mar. 56: 323–338.

Trowbridge, C.D., Little, C., & Stirling, P. 2013. Temporal changes in Codium spp. in Lough Hyne with records for the south Irish coast. Roy. Ir. Acad. 113B. DOI:10.3318/BIOE.2013.07.

Trowbridge, C.D., Little, C., Pilling, G.M., Stirling, P. & Miles, A. 2011. Decadal-scale changes in the shallow subtidal algae of an Irish marine reserve. Bot. Mar. 54: 497–506.

Trowbridge, C.D., Little, C., Stirling, P., Pilling, G.M. & Dlouhy-Massengale, B. 2013. Lusitanian nemertean species in Lough Hyne Marine Reserve: Paradrepanophorus crassus and Punnettia splendida. Mar. Biodivers. Rec. 6: eo. DOI:10.1017/S1755267213000328.

Trowbridge, C.D., Hiebert, L.S., Junoy, J., Little, C., Stirling, P., Dlouhy-Massengale, B.& McAllen, R.  2015. Nemerteans in an Irish marine reserve: synopsis of current and historical records. Mar. Biodivers. Rec. 8, eo. doi:10.1017/S1755267215001189.

Trowbridge, C.D., Davenport, J., Plowman, C.Q., Harman, L., & McAllen, R. 2016. Marine aloricate ciliate red tides in a temperate Irish sea lough. Mar. Biodivers. DOI: 10.1007/s12526-016-0520-3.

Trowbridge, C.D., Little, C., Ferrenburg, L.S., Resk, H.M., Kachmarik, K., Plowman, C.Q., Stirling, P., & McAllen, R. 2016. Shallow subtidal octocorals in an Irish marine reserve. Mar. Biodivers. 46, 879–887DOI: 10.1007/s12526-016-0450-0.









Cynthia D. Trowbridge has been fascinated with tidepools, beach drift, and marine life for the past forty years. Her educational background includes a B.A. from Cornell University and a Ph.D. from Oregon State University. She has conducted ecological research on seaweeds and invertebrates in nine countries, including her current work in the UK, Ireland, and Japan. Her specialties include the feeding ecology of herbivorous sea slugs (sacoglossans) and the problem of invasive seaweeds.  She teaches marine-oriented field courses for university students, state park staff, and the general public. Cynthia is the currently serving as an Associate Editor of the Journal of Marine Biology of the U.K. and Marine Biodiversity Records.


Ascidians at Lough Hyne Marine Reserve


Additional Information


Public Outreach



Professional Service


Facebook Group Administrator: Marine Science at Lough Hyne


International Research Experience for Students (IRES): 2012-2015

(2012) Laurel Hiebert, Katie Thomas, Caitlin Clark, & Yolimar Rivera Vázquez

(2013) Yolimar Rivera Vázquez, Keats Conley, Dylan Cottrell, Sara Edquist, Jill Lundquist, Charlie DiBartolomeo, & Cabot Zucker

(2014) Sara Edquist, Ryan Jiorle, Caitlin Plowman, Katy Kachmarik, & Carly Otis 

(2015) Caitlin Plowman, Hayley Resk, & Luke Ferrenburg


Faculty Collaborators

  • John Davenport, Rob McAllen, Colin Little (current)
  • Bernard Picton, Joanne Porter (2018)


In the news: Press articles


  • sc0004 Southern Star 29 Sep 2012 Community section p 25



Rocky shore zonation (Tasmania)


Corallimorphs in Irish tidal rapids


Boring sponge in Lough Hyne, Ireland

Lough Hyne, Ireland

Lightbulb ascidians in Ireland