Preliminary analysis of exploration data from pacific deposits of manganese nodules

Morgan, C. L.; Nichols, Jean A.; Selk, Bruce W.; Toth, John R.; Wallin, Charles S.

doi:10.1080/10641199309379903

Cited by 17 publications

(13 citation statements)

References 8 publications

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“…The inclusion of these and other small specimens is responsible for the very high density estimates. Morgan et al (1993) found an increase in total numerical abundance and biomass of the megabenthos progressing from west to east in the CCFZ. Despite the lower quality of the geological image material of this study, the tendency is toward higher density values in areas close to the continents.…”

Section: Megabenthos Densitymentioning

confidence: 96%

“…This table was derived from data compiled by Foell and Pawson in an unpublished manuscript and are used with their permission. These authors compared their data with those of Hecker and Paul (1977) and Foell et al (1986) to which the data of Foell (1992), Tilot (1992), Morgan et al (1993), and the present study are added.…”

Section: Comparison Of Megabenthic Communities In the North And East mentioning

confidence: 97%

“…In contrast, in the South Pacific, Ophiuroidea and Holothuroidea show higher relative frequencies. Density estimates for the megabenthos are also given in Table 4 Morgan et al (1993), and the present study are added.…”

Section: Comparison Of Megabenthic Communities In the North And East mentioning

confidence: 99%

“…The quality of deep sea floor images depends on the optical characteristics and the construction of the observation system used. Foell et al (1986), Pawson (1988), Foell (1992), Morgan et al (1993), and scientists of the German geological expeditions used a vertical angle of view. Hecker (1990) preferred a towed system with a forward orientation of the cameras.…”

Section: Indetmentioning

confidence: 99%

“…However, the megabenthic organisms are widely distributed in manganese nodule areas and are suitable as one indicator organism group for monitoring. Considerable data on the diversity and density of megabenthos are available from manganese nodules sites in the North Pacific (Hecker and Paul, 1977;Foell et al, 1986;Pawson, 1988;Foell, 1992;Tilot, 1992;Morgan et al, 1993), and Indian Ocean (Sharma and Rao, 1992). This study is based on photo and video material from 15 German expeditions into the North and South Pacific Ocean.…”

Section: Introductionmentioning

confidence: 99%

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

Bluhm

1994

Aquatic Conservation

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1.Marine 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.2. 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.3. 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.4. A comparison of the results with data from the literature demonstrates that the different methods used result in different density values.5 . Total density varied between less than 300 to more than 1600 individuals/10000m2. 6 . 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 3m, and the area covered by one photograph is within 3 to 5 m2.

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Section: Megabenthos Densitymentioning

confidence: 96%

Section: Comparison Of Megabenthic Communities In the North And East mentioning

confidence: 97%

Section: Comparison Of Megabenthic Communities In the North And East mentioning

confidence: 99%

Section: Indetmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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