Monitoring megabenthic communities in abyssal manganese nodule sites of the East Pacific Ocean in association with commercial deep‐sea mining

Aquatic Conservation: Marine and Freshwater Ecosystems - Tập 4 Số 3 - Trang 187-201 - 1994
Hartmut Bluhm1
1Institut für Hydrobiologie und Fischereiwissenschaft, Universität Hamburg, Zeiseweg 9, D-22765 Hamburg, Germany

Tóm tắt

AbstractMarine mining of manganese nodules will affect the deep sea benthos in a harmful and longterm way. The near complete removal of manganese nodules will result in a change of the megabenthic community from one that is rich in both diversity and density to a soft bottom community with greatly reduced diversity.Pre‐pilot mining tests and pilot mining operations, which have to demonstrate the feasibility of deep‐sea mining, should be accompanied by environmental impact studies before commercial mining begins.The photographic assessment of megabenthic communities represents one cost‐effective possibility of monitoring large‐scale impacts on the deep sea floor. A method based on the analysis of video and photomaterial was used to obtain basic data on community structure and density of the abyssal megabenthos of undisturbed manganese nodule sites in the North (Clarion‐Clipperton Fracture Zone) and South (Peru Basin) Pacific Ocean.A comparison of the results with data from the literature demonstrates that the different methods used result in different density values.Total density varied between less than 300 to more than 1600 individuals/10000 m2.There is a clear need for standardization of methods. A system which combines video and photographic capabilities is useful. It will give the best results when the distance of the camera to the sea floor is between 2 and 3 m, and the area covered by one photograph is within 3 to 5 m2.

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Tài liệu tham khảo

Bluhm H. 1993. ‘Effects of deep‐sea mining for manganese nodules on the abyssal megabenthic community’ Proceedings of the 25th Annual Offshore Technology Conference Houston Texas May 7–10 1993 (OTC Paper 7134) Offshore Technology Conference Houston 521–529.

Foell E. J. 1992.Abyssal Megabenthos and Microtopographic Features of the Cruise 92P Area of the Northeastern Tropical Pacific Ocean near DOMES Site C Report under NOAA Contract 40‐AANC‐8–00964 National Oceanic and Atmospheric Administration Washington D. C. 38pp.

Foell E. J. Dick D. E.andPawson D. L. 1986.Occurrence Distribution and Populations of Benthic Megafauna near DOMES Site C as Discerned from Videotape Recordings and Bottom Photographs Report under NOAA Contract 50‐DGNC‐5–00133 National Oceanic and Atmospheric Administration Washington D. C. 78pp.

Foell E. J. Thiel H.andSchriever G. 1990. ‘A long term large scale disturbance recolonization experiment in the abyssal eastern tropical South Pacific Ocean’ Proceedings of the 22nd Annual Offshore Technology Conference Houston Texas May 7–10 1990 (OTC Paper 6328) Offshore Technology Conference Houston 497–503.

Greenwald R. J.andHennigar H. Jr. 1988. ‘Designation of an ocean mining stable reference area’ Oceans ′88 Conference Proceedings 752–761.

10.1016/0198-0149(90)90028-T

Hecker B.andPaul A. Z. 1977.Benthic Baseline Survey of the DOMES Area Domes Final Reportunder NOAA Contract 03–6–022–35141 National Oceanic and Atmospheric Administration Washington D. C. 115pp.

Lemche H., 1976, Hadal life as analysed from photographs, Videnskabelige Meddelser fra Dansk Naturhistoriske Forening, 139, 263

Mills E., 1983, Deep‐Sea Biology, 1

10.1080/10641199309379903

Murray J., 1891, Zoology, 3, 525

Pawson D. L. 1988.Analysis of Some OMCO Seafloor photographs from Cruise GR7901 8005 and 8102: Megafauna and Manganese Nodule Data. Part I. Text Final Report under NOAA Contract 40‐AANC‐602101 National Oceanic and Atmospheric Administration Washington D. C. 81pp.

Pawson D. L.andFoell E. J. 1983.Atlas of Photographs of Megafauna from the Study Area Report No. MS‐200‐146 of Deepsea Ventures Inc. Gloucester Point Virginia 120pp.

Roels O. A., 1974, Environmental impact of deep ocean mining, Mining Congress Journal, 60, 34

Rowe G. T., 1983, Deep‐Sea Biology, 97

Schneider J., 1975, Manganknollen—Rohstoffquelle und Umweltproblem für die Zukunft, Umschau, 75, 724

10.1016/0198-0149(92)90096-C

Thiel H., 1975, The size structure of deep‐sea benthos, International Revue der gesamten Hydrobiologie, 60, 575

10.1002/iroh.19920770213

Thiel H.andSchriever G. 1989. Cruise Report DISCOL 1 Sonne—Cruise 61 Balboa/Panama–Callao/Peru with contributions by C. Borowski C. Bussau D. Hansen J. Melles J. Post K. Steinkamp and K. Watson Bericht aus dem Zentrum für Meeres‐ und Klimaforschung der Universität Hamburg 6 50pp.

Thiel H., 1990, Deep‐sea mining, environmental impact and the DISCOL project, Ambio, 19, 245

10.1016/0967-0637(93)90012-R

Tilot V. 1992.La Structure des Assemblages Mégabenthiques d'une Province à Nodules Polymétalliques de l'Ocean Pacifique Tropical Est Thése de Doctorat en Sciences de l'Université de Bretagne Occidentale 380pp.

Tilot V. Le Suave R.andSibuet M. 1988. ‘Biological and environmental relationships in a manganese nodule province between Clarion and Clipperton Fracture Zones: Preliminary study to any benthic assessment in deep seabed mining (poster)’ Fifth Deep‐Sea Biology Symposium Brest 26 June–1 July Abstract 86 Institut Français de Recherche pour l'Exploration de la Mer Brest.

10.1016/0198-0149(87)90148-8

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Aquatic Conservation: Marine and Freshwater Ecosystems

Tập 4 Số 3

187-201

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