Harmful Algal Information System: Event CA-91-008

General Information

Event name:	CA-91-008
Country:	CANADA
Nature of the harmful event:	High Phyto concentration
Event directly affected:
Toxicity detected:	No
Associated syndrome:
Unexplained toxicity:	No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme:	Yes
Event occurred before in this location:	Yes (Concentrations of Dinophysis spp., particularly D. acuminata, are found each year in St. Lawrence. No diarrheic intoxications have been reported.)
Individuals to contact:	HUPPERTZ, Béatrice , LEVASSEUR, Maurice

Location & Date

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Location:	Latitude: , Longitude:
General location information:	Gaspé, Québec Region HAB Area code(s): CA-09
Additional location information:	Northern and southern shore of the Gaspé peninsula and northwestern Gulf of St. Lawrence.
Bloom event dates (yyyy/mm/dd):	Event Date:1991-06-25
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:	Generally in late June, late August at one station.

Microalgae

Causative organism known:	Yes
Causative Species/Genus:	Dinophysis acuminata ( cells/L) Dinophysis spp. (3,632 cells/L) June 25. Dinophysis norvegica ( cells/L) Dinophysis rotundata ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known:	µg/l
Additional bloom information:	- Dinophysis acuminata (dominant dinophysoid species) D. norvegica and D. rotundata observed between June 6 and September 22.
Event-related bibliography:

Environmental Conditions

Weather:		Turbidity (NTU):	Wind direction:
Stratified water:	No	Oxygen content (nL/L):	Wind velocity:
Temperature (°C):		Oxygen saturation %:	Current Direction:
Sechhi disk (m):		Salinity:	Current Velocity:	0

Nutrient information:

Temperature Range During Event:

Max: 14 °C, Min: 11 °C

Salinity Range During Event:

Max: 28, Min: 24

Bloom location in the water column:

Growth:

Advected
In situ

Growth Comments

Dinophysis spp. Can be found throughout the region at low concentrations. It can represent an endemic population although exogenous transport by the Gaspé current could be important in some areas.

Additional Environmental information:

Temperature range: 0-18ºC (11 - 14º C during the bloom). Salinity range: 7-30 ‰ (24 - 28 ‰ during the bloom).