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THE EFFECT OF NUTRIENT LIMITATION AND METAL TOXICITY FOR THE GROWTH OF MARINE DIATOM PHAEODACTYLUM TRICORNUTUM BOHLIN: MICROPLATE BIOASSAY $100.00
Authors:  Vesna Peršić, Darija Vukić Lušić and Janja Horvatić
Abstract:
In this chapter we consider the trophic state and ambient nutrient limitation by the
trophic index (TRIX) calculation and nutrient enrichment bioassay using the unicellular
marine diatom Phaeodactylum tricornutum at two differently eutrophicated NE coastal
Adriatic locations (in the Rijeka Bay area). The first location in Rijeka Port had
significantly higher concentrations of dissolved inorganic nutrients and TRIX indices (up
to 7.53) than the location near the Shipbuilding Industry “3 Maj”. The DIN/TP ratios in
the seawater at Rijeka Port were lower (11.03 to 44.47) than those at the Shipbuilding
Industry “3 Maj” (11.65-73.91), indicating P limitation in Shipbuilding Industry waters.
The nutrient enrichment bioassays revealed P as the key limiting nutrient for the diatom
growth at both sites. In addition, silica and nitrogen limitation was found in all water
samples with the exception of the surface water samples in Rijeka Port.
To determine the toxicity of metals (Ni2+, Co2+, Zn2+, Cd2+ and Hg2+), algal growth
inhibition test was carried out with the unicellular marine diatom Phaeodactylum
tricornutum. The basic design of toxicity test followed the International Standard ISO
10253 marine algal growth inhibition test and was modified for microplates. The
following order of toxicity was achieved: Hg>Cd>Ni>Co>Zn in the exponential phase of
growth, and Hg>Ni>Co>Zn>Cd in the stationary phase of growth, with mercury as the
most toxic metal. 


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THE EFFECT OF NUTRIENT LIMITATION AND METAL TOXICITY FOR THE GROWTH OF MARINE DIATOM PHAEODACTYLUM TRICORNUTUM BOHLIN: MICROPLATE BIOASSAY