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A major change in the phytoplankton of a Swedish sill fjord - A consequence of engineering work?

Artikel i vetenskaplig tidskrift
Författare Helena L. Filipsson
Göran Björk
Rex Harland
Melissa R. McQuoid
Kjell Nordberg
Publicerad i Estuarine Coastal and Shelf Science
Volym 63
Nummer/häfte 4
Sidor 551-560
ISSN 0272-7714
Publiceringsår 2005
Publicerad vid Institutionen för geovetenskaper
Sidor 551-560
Språk en
Länkar dx.doi.org/10.1016/j.ecss.2005.01.0...
Ämnesord diatoms, dinoflagellate cysts, environmental change, engineering work, fjord, sweden, dinoflagellate cyst record, west-coast, koljo-fjord, surface sediments, sweden, variability, skagerrak, diatoms
Ämneskategorier Geovetenskap och miljövetenskap

Sammanfattning

A major phytoplankton change occurred during the late 1930s and early 1940s in Koljo Fjord, a sill fjord on the Swedish west coast. Dinoflagellate cyst concentrations increased tenfold over a short period of time, front hundreds of cysts per gram sediment to thousands; and the species composition of both dinoflagellate cysts and diatoms changed markedly. These changes took place during a period of extensive engineering work at the entrance to the fjord from the Skagerrak. At this time, the entire passage was straightened, a new channel was built in a previously shallow area, and the old connection was closed. This study investigates whether this engineering work could have sufficiently altered the surface-water circulation to bring about the change in the phytoplankton composition. Several mechanisms are explored by which the construction could have influenced the phytoplankton in the fjord. The primary mechanism is probably increased efficiency of tidal-generated surface-water exchange in the fjord, resulting in a larger transport of surface water from the Skagerrak and consequently a changed surface-water environment. This Study highlights how engineering work can have a Substantial impact on the local and regional marine environment, a factor that must not be overlooked in environmental planning. (c) 2005 Elsevier Ltd. All rights reserved.

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