RT Journal Article
T1 Pseudo-nitzschia blooms in a coastal upwelling system: remote sensing detection, toxicity and environmental variables
A1 Torres Palenzuela, Jesus Manuel
A1 González Vilas, Luís
A1 Bellas Aláez, Francisco Miguel
A1 Garet Fernández, María Elina
A1 González Fernández, Maria Africa
A1 Spyrakos, Evangelos
K1 2412 Inmunología
K1 2417.05 Biología Marina
K1 2510.01 Oceanografía Biológica
AB The NW coast of the Iberian Peninsula is dominated by extensive shellfish farming, which places this region as a world leader in mussel production. Harmful algal blooms in the area frequent lead to lengthy harvesting closures threatening food security. This study developed a framework for the detection of Pseudo-nitzschia blooms in the Galician rias from satellite data (MERIS full-resolution images) and identified key variables that affect their abundance and toxicity. Two events of toxin-containing Pseudo-nitzschia were detected (up to 2.5 μg L−1 pDA) in the area. This study suggests that even moderate densities of Pseudo-nitzschia in this area might indicate high toxin content. Empirical models for particulate domoic acid (pDA) were developed based on MERIS FR data. The resulting remote-sensing model, including MERIS bands centered around 510, 560, and 620 nm explain 73% of the pDA variance (R2 = 0.73, p < 0.001). The results show that higher salinity values and lower Si(OH)4/N ratios favour higher Pseudo-nitzschia spp. abundances. High pDA values seem to be associated with relatively high PO43, low NO3− concentrations, and low Si(OH)4/N. While MERIS FR data and regionally specific algorithms can be useful for detecting Pseudo-nitzschia blooms, nutrient relationships are crucial for predicting the toxicity of these blooms.
PB Water
SN 20734441
YR 2019
FD 2019-09-19
LK http://hdl.handle.net/11093/2189
UL http://hdl.handle.net/11093/2189
LA eng
NO Water, 11(9): 1954 (2019)
NO European Commission
DS Investigo
RD 23-ene-2025