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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.

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one publication added to basket [207937]

Multispecies resource management of economically important marine plant communities of eastern Canada Pringle, J.D.; Sharp, G.J. (1980). Multispecies resource management of economically important marine plant communities of eastern Canada. Helgol. Meeresunters. 33(1-4): 711-720. https://dx.doi.org/10.1007/BF02414791 In: Helgoländer Meeresuntersuchungen. Biologische Anstalt Helgoland: Hamburg. ISSN 0174-3597, meer Ook verschenen in: Kinne, O.; Bulnheim, H.-P. (Ed.) (1980). Protection of life in the sea: 14th European Marine Biology Symposium, 23-29 September 1979, Helgoland. European Marine Biology Symposia, 14. Helgoländer Meeresuntersuchungen, 33(1-4). 772 pp., meer

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Pringle, J.D. Sharp, G.J.

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Abstract

The annual 45,000 t harvest of six marine plant taxa, consisting principally of the alga Chondrus 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 commercial Chondrus 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 by Chondrus 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 of Laminaria 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.

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