Vertical distribution of Pseudo-nitzschia in the Gulf of Naples across the seasons


FRANCESCO CIPOLLETTA
https://orcid.org/0000-0001-8101-1307
ADEMY RUSSO
DOMENICO D’ALELIO
FRANCESCA MARGIOTTA
DIANA SARNO
ADRIANA ZINGONE
MARINA MONTRESOR
Περίληψη

Pseudo-nitzschia is a widespread genus of marine pennate diatoms comprising 58 species of which 28 can produce the neurotoxin domoic acid, causative of Amnesic Shellfish Poisoning (ASP). Species of the genus are found in both oceanic and coastal waters where they can form large blooms. The timing and magnitude of blooms is generally described based on water samples collected at the surface, while limited information is available on cell distribution within the water column. To address this knowledge gap, we investigated the vertical (0-50 m) distribution of Pseudo-nitzschia species identified in light microscopy using weekly samples collected in the Gulf of Naples (Italy) across an annual cycle (April 2006-April 2007). Physical variables and nutrient concentrations were also monitored. The genus is primarily abundant in surface waters, where spring blooms of P. cf. delicatissima and two morphotypes of P. galaxiae were related to the presence of a water layer with low salinity and high concentration of inorganic nutrients. Blooms of P. cf. pseudodelicatissima, P. allochrona and P. multistriata were recorded at surface during the summer-early autumn, when the water column was stratified and nutrient concentrations were low. Our observations confirmed the marked seasonality of Pseudo-nitzschia species described at our study site with light microscopy and molecular approaches, with species virtually absent from surface waters for long periods of the year. However, the high quantitative resolution applied in this study allowed to reveal low concentrations of Pseudo-nitzschia species/species complexes throughout the water column over the year. Since Pseudo-nitzschia do not produce benthic resting stages, their presence in deeper waters suggests that these species rely on rare overwintering cells that can function as bloom inocula.

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Αναφορές
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