2024-03-28T18:57:28Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/268102022-10-25T12:22:42Zcom_10261_123com_10261_8com_10261_132col_10261_376col_10261_385
2010-08-05T08:56:47Z
urn:hdl:10261/26810
Modulation of nearshore harmful algal blooms by in situ growth rate and water renewal
Basterretxea, Gotzon
Garcés, Esther
Jordi, Antoni
Anglès, Silvia
Masó, Mercedes
Harmful algal bloom
Water renewal
Growth
Model
Mediterranean
13 pages, 10 figures, 1 table
Species belonging to the genera Alexandrium and Gymnodinium are amongst the dinoflagellates that regularly cause massive coastal phytoplankton blooms along Mediterranean beaches. These episodes encompass a variety of factors favouring bloom development, including near-shore nutrient enrichment, enhanced growth and low water renewal. During the summer of 2003 the development of a bloom was monitored at 2 nearby beaches, Peguera and Santa Ponça, located at the head of Santa Ponça Bay (Mallorca). Both sites are under the influence of the same physical regime—which is mainly wind-forced—and present relatively high inorganic nutrient concentrations for Mediterranean waters during summer (mean dissolved inorganic nitrogen > 1.2 µM and PO4 > 0.18 µM). Total dinoflagellate abundance exhibited a similar trend at both beaches, with remarkable outbursts in late June (>8 × 106 cells l–1). Water exchange calculations, based on 3D numerical modeling, yielded low average renewal rates at both sites (<0.08 d–1), and cell growth estimations suggested a significant increase in the specific growth rates during the blooming season associated with the seasonal temperature variation. We postulate that both the increased growth rates and the low wind-induced water renewal times are complementary factors and are of key relevance to the modulation of these blooms. Diagnostic analyses using a simple phytoplankton-zooplankton (PZ) model allowed us to observe the effect of growth rate and water renewal on bloom dynamics, and to identify a threshold condition for bloom occurrence
2010-08-05T08:56:47Z
2010-08-05T08:56:47Z
2007-12-20
artículo
Marine Ecology Progress Series 352: 53-65 (2007)
0171-8630
http://hdl.handle.net/10261/26810
10.3354/meps07168
eng
https://doi.org/10.3354/meps07168
openAccess
Inter Research