Stability of a sea urchin front in southwest Nova Scotia / by R.J. Miller. : Fs97-4/1662E-PDF

"Sea urchin (Strongylocentrotus droebachiensis) abundance and macrophyte cover was surveyed in 1979, nearshore west of Cape Sable Island. Parts of this area most likely to experience change in urchin abundance and macrophyte cover were resurveyed in 1981, and results of the two surveys are compared in this report. There were no marked changes in sea urchin abundance or biomass, there was little recruitment of urchins smaller than 3 cm diameter, and there was no general migration of high urchin densities toward shore. Area of kelp cover did not change, although on most transects the transition from good to poor cover of macrophyte understory was closer to shore in 1981. In summary, for most of the parameters measured, any change from 1979 to 1981 did not exceed the precision of measurement"--Abstract, page iv.

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