Scales characterising a high density thin layer of Dinophysis acuta Ehrenberg and its transport within a coastal jet

Type Article
Date 2012-03
Language English
Author(s) Farrell Hazel1, Gentien Patrick2, Fernand Liam3, Lunven Michel2, Reguera Beatriz4, Gonzalez-Gil Sonsoles4, Raine Robin1
Affiliation(s) 1 : Natl Univ Ireland, Ryan Inst Environm Marine & Energy Res, Galway, Ireland.
2 : IFREMER, Ctr Brest, F-29280 Plouzane, France.
3 : CEFAS, Ctr Environm Fisheries & Aquaculture Sci, Lowestoft NR33 0HT, Suffolk, England.
4 : Ctr Oceanograf Vigo, IEO, Vigo 36390, Spain.
Source Harmful Algae (1568-9883) (Elsevier Science Bv), 2012-03 , Vol. 15 , P. 36-46
DOI 10.1016/j.hal.2011.11.003
WOS© Times Cited 45
Keyword(s) Coastal jets, Dinophysis, Ireland, Transport
Abstract An investigation into the distribution of Dinophysis spp. in coastal waters off the south coast of Ireland was carried out in July 2007. Dinophysis acuta was present as a sub surface layer containing up to 55,000 cells L-1. The population had a high percentage of viable cells (mean: 89%; median: 94%; n = 24)
with a high specific division rate (~0.55 d-1). The layer, of approximately 5 m thickness, did not coincide with the fluorescence maximum and was present as a patch of horizontal dimension less than 10 km x 7 km. Both conventional and towed undulating CTD used in conjunction with high vertical resolution sampling methods showed the patch of Dinophysis to move with a similar speed and direction as the coastal flow, which ran parallel to the coast in the form of a coastal jet with speed of the order of 6.5–7 km day-1. The implications of the alongshore transport of populations of harmful species in coastal jets for monitoring programmes and predictive models are discussed.
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