- Management Of Areas, Species And Ecosystems
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Multispecies resource management of economically important marine plant communites of eastern Canada
Helgoländer Meeresuntersuchungen volume 33, pages 711–720 (1980)
Abstract
The annual 45,000 t harvest of six marine plant taxa, consisting principally of the algaChondrus crispus, is worth $ 5 million annually to maritime fishermen. The harvesting techniques enable capture of associated biota and alter the abiotic structure of the habitat. Methods developed to assess ecological impact include permanent transects which are sampled for vegetation composition and dry biomass.C. crispus represents 80% of the plant biomass in commercial beds; 27 other genera comprise the remainder. Thirty-five associated invertebrate species include only one of direct economic importance, the lobster,Homarus americanus. On commercialChondrus beds off western Prince Edward Island, lobsters were captured in basket dragrakes up to 5.4 h−1 during 1975 and 1976. Of the total lobster catch, the percentage injured byChondrus dragrakes was 2.7% in 1975 and 1.3% in 1976.Chondrus dragrakes, as used in southwestern Nova Scotia, disrupt the drumlin substrate. Controlled dragraking for 2-h periods disrupted 0.25% to 1.5% of the bottom area. One month of normal harvest activity displaced 0.5% to 2.9% of the bottom of surveyed sites. A harvest of 1000 t ofLaminaria spp. is projected for 1979. Dragrakes harvest entire plants averaging 5.0 ± 2.3 m in length. The residual population averaged 2.3 ± 1.9 m. Indirect effects of kelp harvesting on the benthic community are the subject of ongoing research.
Literature cited
Chapman, A. R. O. & Gagne, J. Environmental control of kelp growth in St. Margarets Bay and on the southwest shore of Nova Scotia. In: Proceedings of the workshop on the effects of commercial marine algal/animal harvesting on sea urchin grazing. Ed. by J. D. Pringle, G. J. Sharp & J. F. Caddy. Fisheries and Oceans Canada, Halifax, N. S. (In press.)
Breen, P. A. & Mann, K. H., 1976. Changing lobster abundance and destruction of kelp beds by sea urchins. — Mar. Biol.34, 137–142.
Lilly, G. R., 1968. Some aspects of the ecology of Irish moss,Chondrus crispus (L.) Stackhouse in Newfoundland waters. — Tech. Rep. Fish. Res. Bd Can.43, 1–44.
MacFarlane, C. I., 1952. A survey of certain seaweeds of commercial importance in Southwest Nova Scotia. — Can. J. Bot.30, 78–97.
MacFarlane, C. I., 1968.Chondrus crispus Stackhouse — a synopsis. Nova Scotia Research Foundation, Halifax, N. S., 47 pp.
Mann, K. H. & Breen, P. A., 1972. The relation between lobster abundance, sea urchins, and kelp beds. — J. Fish. Res. Bd Can.29, 603–609.
Pringle, J. D., 1976. The marine plant industry — commercially important species and resource management. In: The proceedings of the Bras d'Or Lakes Aquaculture Conference. Ed. by G. McKay & K. McKay. College of Cape Breton Press, Sydney, N. S., 161–181.
Pringle, J. D., 1979. Aspects of the ecological impact ofChondrus crispus (Florideophyceae) harvesting in eastern Canada. — Int. Seaweed Symp.9, 225–232.
Pringle, J. D. & Semple, R. E., 1976. A preliminary assessment of the ecological impact of an experimentalChondrus (Irish moss) harvester off coastal Prince Edward Island. — Fish. mar. Serv. tech. Rep. Ser.Mar/T-76/1, 1–28.
Pringle, J. D. & Semple, R. E., 1978. The incidental harvest of immatureChondrus crispus (Irish moss) and its possible effects on commercial yield. — Tech. Rep. Fish. mar. Serv.806, 1–7.
Pringle, J. D. & Semple, R. E. The benthic algal biomass, commercial harvesting, andChondrus growth on colonization off southwest Nova Scotia. In: Proceedings of the workshop on the effects of commercial marine algal/animal harvesting on sea urchin grazing. Ed. by J. D. Pringle, G. J. Sharp & J. F. Caddy. Fisheries and Oceans Canada, Halifax, N. S. (In press.)
Scarratt, D. J., 1972. Investigations into the effects on lobsters of raking Irish moss, 1970–71. — Tech. Rep. Fish. Res. Bd Can.329, 1–20.
Scarratt, D. J., 1973. Claw loss and other wounds in commercially caught lobsters (Homarus americanus) — J. Fish. Res. Bd Can.30, 1370–1373.
Sharp, G. J. The history of kelp harvesting in southwestern Nova Scotia. In: Proceedings of the workshop on the effects of commercial marine algal/animal harvesting on sea urchin grazing. Ed. by J. D. Pringle, G. J. Sharp & J. F. Caddy. Fisheries and Oceans Canada, Halifax, N. S. (In press.)
Taylor, A. R. A., 1973. Studies of populations ofChondrus crispus (Irish moss) andFurcellaria fastigiata in Prince Edward Island waters during 1971. — Fish. mar. Serv. tech. Rep. Ser., ind. Dev. Branch, Canada65, 1–109.
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Pringle, J.D., Sharp, G.J. Multispecies resource management of economically important marine plant communites of eastern Canada. Helgolander Meeresunters 33, 711–720 (1980). https://doi.org/10.1007/BF02414791
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DOI: https://doi.org/10.1007/BF02414791