00000nam 2200000zi 4500 9.911464 CaOODSP 20221031100737 m o d f cr mn||||||||| 220522t20222022bccab ob f000 0 eng d 9780660436180 CaOODSP eng rda CaOODSP eng eng fre n-cn-bc pn----- x9y2 Fs97-4/3244E-PDF Curtis, Lyanne J.F., author. Experimental harvest of red sea urchins, Mesocentrotus franciscanus [A. Agassiz, 1863], and trends in red, green (Strongylocentrotus droebachiensis; [Des Moulins, 1837]) and purple (S. purpuratus; [Stimpson, 1857]) sea urchin populations within the Tofino research area (1994-2012) / by Lyanne J.F. Curtis and Dan Leus. Nanaimo, British Columbia : Fisheries and Oceans Canada, Science Branch, Pacific Region, Pacific Biological Station, 2022. ©2022 1 online resource (xi, 57 pages) : illustrations, colour map. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian manuscript report of fisheries and aquatic sciences, 1488-5387 ; 3244 Includes bibliographical references (pages 19-23). "In the early 1990s, a sea urchin research area was established near Tofino, BC, Canada, to conduct research on sea urchin populations. This report focuses on two studies between 1994 and 2012. The first study investigated the impacts of harvesting Red Sea Urchins (RSU; Mesocentrotus franciscanus) and the second study describes trends of RSU, Green Sea Urchin (GSU; Strongylocentrotus droebachiensis), and Purple Sea Urchin (PSU; S. purpuratus) populations over an eighteen year timespan. Experimental harvesting had minimal short (< 2 years) or long (5 year) term impacts on RSU. Within 2 years of harvest, significant decreases in mature and total RSU populations only occurred at a few sites. In contrast, immature RSU decreased significantly 5 years after harvesting at several sites, which may be associated with an El Niño event. Although variability was evident in all three species, populations remained relatively stable from 1994 through 2005 and then after 2005, urchin populations began to decline steadily until 2009 reaching near zero values of all indices until the end of the study period. The decline in sea urchin populations was likely associated with the establishment of a Sea Otter population near the research area in 2004"--Abstract, page x. Includes abstracts in English and French. Red sea urchin fisheries British Columbia Vancouver Island. Strongylocentrotus British Columbia Vancouver Island. Sea urchin populations British Columbia Vancouver Island. Oursin rouge Pêche commerciale Colombie-Britannique Vancouver, Île de. Strongylocentrotus Colombie-Britannique Vancouver, Île de. Oursins Populations Colombie-Britannique Vancouver, Île de. Canada. Department of Fisheries and Oceans, issuing body. Pacific Biological Station (1972- ), issuing body. Canadian manuscript report of fisheries and aquatic sciences ; 3244. (CaOODSP)9.505211 PDF 2.29 MB https://publications.gc.ca/collections/collection_2022/mpo-dfo/Fs97-4-3244-eng.pdf