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- W2271900519 abstract "Dredge spoil from the Port of Auckland has been dumped onto a shallow, shelly seafloor near Rangitoto Island for many years. An investigation undertaken in 1988 and 1989 concentrated on two designated spoil release locations; one in use since January 1988 (A) and the other for the 8 years prior to 1988 (B). At A, disposal of 30,000 m{3} of mud and fine sand has caused gross physical impact over an area of c.1.5 hectares. Here the benthos was reduced in quantity and diversity. Beyond this zone, increases in the proportion of fine sands were noted but no biological impact was detected. At B disposal of c. 500,000 m{3} of spoil over 8 years resulted in shoaling, to a maximum of 4 m, over an area of at least 19 hectares. Surficial sediments of the spoil ground coarsened after cessation of dumping and in response to selective removal of the mud fraction. Five months after disposal ceased, the benthic macrofauna around the site remained impoverished. A little over a year later, faunal richness and abundance levels had been re-established to approach these at nearby control stations, although in species composition the imprint of dumping remained evident. It is suggested that disposal of the Port of Auckland's dredge spoil onto a muddy seafloor would result in less biologic impact than dumping at the present Rangitoto location." @default.
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- W2271900519 date "1991-01-01" @default.
- W2271900519 modified "2023-09-27" @default.
- W2271900519 title "The Rangitoto Spoil Ground: Impact of Dumping Dredge Spoil from the Port of Auckland on a Shallow Seafloor" @default.
- W2271900519 hasPublicationYear "1991" @default.
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