PSEUDO-NITZSCHIABLOOMS IN THE ZRMANJA RIVER ESTUARY (EASTERN ADRIATIC SEA)

Ecology and taxonomy of potentially toxic Pseudo-nitzschia species in Lim Bay (north-eastern Adriatic Sea)

“…This is in accordance with phosphorous higher concentrations ) during the Pseudo-nitzschia outbreak in Lim Bay. The lowest values of the Si:N ratio coincided with Pseudo-nitzschia species blooms in our study and in other studies in the Adriatic (Penna et al, 2006;Burić et al, 2008). It may be assumed that low Si:N ratios either favour the growth of Pseudonitzschia species over other diatoms due to lower silica requirements, as has been previously indicated (Sommer, 1994;Marchetti et al, 2004), or it could be a consequence of the nutrient uptake of the bloom.…”

“…calliantha is a geographically widespread species (Lundholm et al, 2003;Quijano-Scheggia et al, 2008;Churro et al, 2009), and according to recent investigations and to this study, is a permanent constituent of phytoplankton assemblages in Adriatic Sea (Caroppo et al, 2005;Burić et al, 2008). Blooming events in both the warmer and colder parts of the year indicate its tolerance to a wide range of temperatures (Caroppo et al, 2005;Quiroga, 2006;Burić et al, 2008;Quijano-Scheggia et al, 2008). P. calliantha has been found to produce DA in several areas around the world as well as in cultures (Martin et al, 1990;Lundholm et al, 1997;Lundholm et al, 2003;Besiktepe et al, 2008;Sahraoui et al, 2009).…”

“…Although there have been records of domoic acid (DA) production in the northern Adriatic (Marić et al, 2011), species composition, species seasonality as well as the relationship to physico-chemical parameters still remains to be elucidated. So far, Pseudo-nitzschia calliantha Lundholm, Moestrum and Hasle in the northern, middle (Kaštela Bay, Novigrad Sea) and southern Adriatic (Bay of Kotor) and Pseudo-nitzschia delicatissima (Cleve) Heiden in the southern part along the Italian Adriatic coast (Caroppo et al, 2005;Burić et al, 2008;Bosak et al, 2010;Moschandreou et al, 2010;Marić et al, 2011) have been identified. Investigations on the seasonality of specific species and the relation to environmental factors in the Adriatic Sea are scarce.…”

“…the middle and southern Adriatic during the colder part of the year (Caroppo et al, 2005;Burić et al, 2008). Recent investigations in the northern Adriatic revealed P.calliantha as the dominant Pseudonitzschia species, contributing up to 70% to the total phytoplankton abundance.…”

An autumn bloom of diatoms of the genus Pseudo-nitzschia H. Peragallo, 1900 in Amursky Bay, the Sea of Japan

“…Because of the poisoning hazard that exists in marine coastal areas, there is a need for a comprehensive study of the morphology, ecology, and dynamics of Pseudo nitzschia species. Studies of the natural population dynamics of Pseudo nitzschia are generally focused on elucidating the mechanisms of bloom formation with the aim of predicting bloom events of species of this genus and to prevent toxicity of commercially valuable invertebrates [7][8][9][10]15]. Beginning in 1992, the abundant development of Pseudo nitzschia species has been observed in coastal waters of the Sea of Japan: in the vicinity of Vladivos tok, in areas of mariculture farms, and in recreational zones [4,16,20].…”