High proliferation of Pseudo-nitzschia cf. arenysensis in the Adriatic Sea: ecological and morphological characterisation

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Опубликован: dic 1, 2020
DOI: https://doi.org/10.12681/mms.22932
JASNA ARAPOV
Institute of Oceanography and Fisheries, Croatia
https://orcid.org/0000-0001-7568-1929
MIA BUŽANČIĆ
Institute of Oceanography and Fisheries, Croatia
https://orcid.org/0000-0003-3848-9561
ANTONELLA PENNA
University of Urbino, Department of Biomolecular Sciences, Italy
SILVIA CASABIANCA
University of Urbino, Department of Biomolecular Sciences, Italy
SAMUELA CAPELLACCI
University of Urbino, Department of Biomolecular Sciences, Italy
FRANCESCA ANDREONI
University of Urbino, Department of Biomolecular Sciences, Italy
SANDA SKEJIĆ
Institute of Oceanography and Fisheries, Croatia
ANA BAKRAČ
Institute of Oceanography and Fisheries, Croatia
MAJA STRAKA
Institute of Oceanography and Fisheries, Croatia
JELENA JELENA MANDIĆ
Institute of Oceanography and Fisheries, Croatia
ŽIVANA NINČEVIĆ GLADANA
Institute of Oceanography and Fisheries, Croatia
Аннотация

The aim of the present study isto characterise the diatom Pseudo-nitzschia community during a bloom period together with environmental conditions. High proliferation of Pseudo-nitzschia spp. was observed in September 2017 at the shellfish breeding area in the Krka River estuary (Central eastern Adriatic Sea). The peak of abundance (1.8 x 106 cells L-1) was recorded at 7 m depth, and the increased abundance persisted for four weeks.Morphological analyses of field samples based on scanning electron microscopy (SEM) revealed that Pseudo-nitzschia cf. arenysensis was prevailing (94%) in the Pseudo-nitzschia assemblage. Several strains were successfully isolated from net samples in order to better define morphological features and phylogenetic characterisation. The isolated Pseudo-nitzschia strains corresponded morphologically to the P. cf. arenysensis from the field samples, based on our SEM observations. Phylogenetic analysis demonstrated that the Croatian strains grouped with P. arenysensis using the ITS and LSU rDNA sequences. Spearman rank correlation showed that salinity was an important environmental factor affecting the vertical distribution of Pseudo-nitzschia spp. in this highly variable area. Availability of increased concentration of orthophosphates and ammonium and low Si: TIN ratio may have promoted the bloom of P. cf. arenysensis in the estuary.

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Биографии авторов
MIA BUŽANČIĆ, Institute of Oceanography and Fisheries, Croatia
Laboratory of Plankton and Shellfish Toxicity
ANTONELLA PENNA, University of Urbino, Department of Biomolecular Sciences, Italy
Department of Biomolecular Sciences
SILVIA CASABIANCA, University of Urbino, Department of Biomolecular Sciences, Italy
Department of Biomolecular Sciences
SAMUELA CAPELLACCI, University of Urbino, Department of Biomolecular Sciences, Italy
Department of Biomolecular Sciences
FRANCESCA ANDREONI, University of Urbino, Department of Biomolecular Sciences, Italy
Department of Biomolecular Sciences
SANDA SKEJIĆ, Institute of Oceanography and Fisheries, Croatia
Laboratory of Plankton and Shellfish Toxicity
ANA BAKRAČ, Institute of Oceanography and Fisheries, Croatia
Laboratory of Plankton and Shellfish Toxicity
MAJA STRAKA, Institute of Oceanography and Fisheries, Croatia
Laboratory of Plankton and Shellfish Toxicity
JELENA JELENA MANDIĆ, Institute of Oceanography and Fisheries, Croatia

Laboratory of Chemical Oceanography and Sedimentology of the Sea

 

 

ŽIVANA NINČEVIĆ GLADANA, Institute of Oceanography and Fisheries, Croatia
Laboratory of Plankton and Shellfish Toxicity
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