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JPR Advance Access originally published online on July 27, 2005
Journal of Plankton Research 2005 27(8):763-774; doi:10.1093/plankt/fbi050
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org.

On the presence of Pseudo-nitzschia calliantha Lundholm, Moestrup et Hasle and Pseudo-nitzschia delicatissima (Cleve) Heiden in the Southern Adriatic Sea (Mediterranean Sea, Italy)

C. Caroppo1,*,{dagger}, R. Congestri2,{dagger}, L. Bracchini3,4 and P. Albertano2

1 Institute for Coastal Marine Environment, Taranto Section, Italian National Research Council, via Rome, 3-74100 Taranto, Italy, 2 Department of Biology, University of Rome "Tor Vergata", via Della Ricerca Scientifica, 00133 Rome, Italy, 3 Department of Chemical and Biosystem Sciences, Laboratory of Environmental Spectroscopy, University of Siena, via Aldo Moro, 2-53100 Siena, Italy and 4 CSGI, via Della Lastruccia, 3-50010 Sesto Fiorentino, Florence, Italy

* Corresponding Author: carmela.caroppo{at}iamc.cnr.it

Received April 4, 2005; accepted in principle June 7, 2005; accepted for publication July 19, 2005; published online July 27, 2005

This investigation included a 2-year monitoring program aimed at assessing the abundance and distribution of harmful marine phytoplankton along the Southern Adriatic coast of Italy. Monthly sampling was conducted from April 1995 to March 1997 at four sampling stations along four transects, to determine the temporal and spatial presence/abundance of the potentially toxic Pseudo-nitzschia species. The study focussed on the most abundant taxa Pseudo-nitzschia calliantha and Pseudo-nitzschia delicatissima, the identities of which were confirmed by TEM on cleaned net material. The distribution patterns of these potential Amnesic Shellfish Poisoning (ASP) toxin producers were statistically analysed by Generalised Linear Model ANalysis Of VAriance, Principal Component Analysis (GLM ANOVA, PCA) and Spearman’s correlation analysis in order to address relationships between environmental variable and population dynamics. Abundances displayed horizontal and vertical structure in the study area. Inter-annual variability was also observed for both species that appeared to respond differently to the environmental factors investigated. Distributions of P. calliantha showed a stronger seasonality and was more correlated with winter water conditions than P. delicatissima, which in turn exhibited a broader temporal distribution and appeared independent from major environmental constraints. This is the first report of the occurrence and dynamics of P. calliantha and P. delicatissima populations in Southern Adriatic coastal waters.

{dagger} First two authors equally contributed to this work.


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