ShellEye Water Quality Event Map
Subscribe to ShellEye bulletin service
Register your interest
Cruising the Clyde: new publication
11 December 2017
Prof. Keith Davidson, from the
Scottish Association for Marine Science (SAMS)
, provides an update on the Scottish Clyde Sea sampling cruise.
In September 2015 researchers from the SAMS and the Marine Institute (Ireland) cruised the Clyde Sea in southwest Scotland. We sampled 12 stations that stretched from the very top of Loch Fyne to the central Clyde Sea, approximately level with Prestwick Airport. At the same time Food Standards Scotland (FSS) was taking samples from active shellfish harvesting sites for their on-going regulatory monitoring for shellfish flesh biotoxins.
We detected a bloom of
which appeared to have accumulated against a thermal front at the mouth of Loch Fyne. The location of the front could be detected in directly sampled CTD contour plots, in satellite images of sea surface temperature (Dr Peter Miller, PML) and through particle tracking modelling (Dr Thomas Adams, SAMS). The maximum cell density of
at the front was 2840 cells/L, much higher than
(max. 200 cells/L) in the same samples. At the same time, FSS was able to detect diarrhetic shellfish poisoning (DSP) toxins within shellfish at concentrations high enough to close harvesting (max. 601 ±237 mg OA eq/kg shellfish flesh). We also detected other potentially harmful diatom blooms in the area but without reported effects to local aquaculture operations.
In Scottish waters
is usually the most abundant species, however, in this instance
dominated. Increased abundance of
has been previously linked with physical cell aggregation and increases in surface water temperatures. Furthermore,
is linked with the production of Dinophysis-2 toxin, which is thought to remain inside shellfish for longer than the types of toxin produced by
. This could pose a considerable threat to shellfish aquaculture especially in a time of climate change and its effects, such as rapidly warming sea surface temperatures.
The associated paper was published in Harmful Algae Journal in Summer 2017:
Paterson, R.F., McNeill, S., Mitchell, E., Adams, T., Swan, S., Clarke, D., Miller, P.I., Bresnan, E., Davidson, K. (2017) Environmental control of harmful dinoflagellates and diatoms in a fjordic system. Harmful Algae. 69: 1-17.
Previous articles on the Clyde cruises were