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• W2047502458 abstract "ABSTRACT The DISCOL study involving a long-term, large-scale, disturbance-recolonization experiment in the abyssal South Pacific Ocean was devised to achieve a better understanding of the rate, sequence, and direction of benthic community re-establishment after severe anthropogenic disturbance of the seabed similar to that expected to result from deep sea floor mining. The project is funded by the German government and has been in progress since February, 1989, when the experiment was initiated during a two-month cruise aboard FS SONNE. After site selection and baseline assessments, a circular area of the seabed was impacted using a specially designed disturber device and then examined during an ini tial post-impact sampling series. The DISCOL site was sampled again during a second cruise in September, 1989, about six months after the impact was created. A third cruise of the recently rebuilt and enlarged FS SONNE will again visit the site in January-February, 1992, in order to carry out another post-impact sampling series three years after the disturbance. Bottom sediment and biota samples, photo/video images, and other data obtained during the first two cruises are continuing to be evaluated, but some initial results have become available and are summarized in this paper. Experimental studies on large scales have rarely been attempted or successfully carried out in the challenging deep-sea milieu, but are vital to understanding biological processes and evaluating impacts resulting from ocean mining and other future industrial incursions into this largest and least understood of marine environments. INTRODUCTION The DISCOL (disturbance-recolonization) experiment in a manganese nodule area of the southeastern Pacific Ocean is funded by the German Federal Ministry for Research and Technology and has been in progress since February, 1989, when a circular 10.8 km2 area of the sea floor at depths near 4150 m and located approximately 650 km southeast of the Galapagos Islands (Figure 1) was selected as the for a large-scale and long-term study.1,2 The site was divided into eight pre-shaped sectors, each consisting of a central and a peripheral region separated by a 350 m wide buffer zone. Five central and five peripheral sector regions, designated according to their compass position prefixed by a C or P respectively, were randomly selected for concentrated study (sectors labelled in Figure 1). After taking a series of pre-impact baseline samples (DISCOL 1/1) to serve as controls, the DISCOL Experimental Area (DEA) was intentionally disturbed with a specially designed eight meter wide plow harrow device during the later part of February and in early March of 1989. 3,4 The disturber device was towed across the DEA center a total of 78 times on diametric courses which resulted in a central region of densely clustered plow tracks surrounded by a less severely affected peripheral region as shown in Figure 2." @default.
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• W2047502458 date "1992-05-04" @default.
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• W2047502458 title "Disturbance and Recolonization Experiment in the Abyssal South Pacific Ocean (DISeOL): An Update*" @default.
• W2047502458 doi "https://doi.org/10.4043/6805-ms" @default.
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