|The vertical distribution and habitat of the ascidians in Borgenfjorden, North-Tröndelag, Norway|
Gulliksen, B. (1973). The vertical distribution and habitat of the ascidians in Borgenfjorden, North-Tröndelag, Norway. Sarsia 52: 21-28
In: Sarsia. University of Bergen. Universitetsforlaget: Bergen. ISSN 0036-4827, more
Six ascidian species were sampled from 4, 8, 12 and 16 m depth along 7 line transects. Styela coriacea and S. rustica were most specific as to depth requirements. S. coriacea had the highest densities just below the algal belt and S. rustica preferred the deepest stations. Ciona intestinalis, Dendrodoa grossularia, Corella parallelogramma, and Molgula siphonalis seemed to be less particular about depth, and other factors like substrate, nutrition, and current may be more important for the distribution.