12th International Conference on Harmful Algae

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INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 20062000, 173.PO.15-17The monitoring programme forharmful algal blooms in shellfishproduction areas in Catalonia.Long term data and impact onaquacultureSession: PO.15 - MonitoringJ Diogène 1 , M Fernández 1 , E Cañete 1 ,A Caillaud 1 , E Mallat 1 , M Delgado 2 , DFurones 11 IRTA, SANT CARLES DE LA RAPITA,Spain2 Institut de Ciències del Mar-CMIMA,BARCELONA, SpainThe monitoring programme forHABs in shellfish production areasin Catalonia focuses mainly onshellfish harvesting areas in sandysediments along the shore (mainlynatural production sites of clams)and production areas within thesemi-confined areas (mainly oysterand mussel cultures). HABincidences in production areasinclude recurrent DSP (e.g.,Dinophysis sacculus), PSP (e.g.,Alexandrium minutum) and to amuch lesser extent ichthyotoxicevents (Karlodinium spp.). Anestimate of the percentage ofclosure periods indicates thatannually these figures haveincreased since 1989, DSP eventsbeing the major cause foradministrative closures. For theperiod 2002-2005 closure time inshellfish production areas reachedmaxima of 23 % (84 days in AlfacsBay during 2002 for DSP) and 17%(62 days in Alfacs Bay during 2005for DSP). The economic impact ofclosures is irregular and dependson the time of the year closuresoccur. This is due to unbalancedcommercial demand along the yearbut also to the threat that increasedtemperatures in summer representto unharvested production in semiconfinedareas. This can lead tomassive mortality of mussels andoysters when closures occur justbefore harvesting periods.PO.06-21Water mass differentiation usingPARAFAC modeling of EEMfluorescenceSession: PO.06 - Population dynamicsLK Dixon 1 , RN Conmy 21 Mote Marine Laboratory, SARASOTA, FL,United States of America2 University of South Florida, ST.PETERSBURG, FL, United States ofAmericaThe optical properties of coastalwaters, as excitation-emissionmatrix (EEM) fluorescence (220-455nm excitation, 249-700nmemission) and CDOM absorption,were used to map a complexcoastal environment off the westcoast of Florida (U.S.A.) whichreceives multiple estuarine inputsand records nearly annualoccurrences of Karenia brevisblooms. Sampling was conductedduring the initiation and continuationof an extended and extensivebloom. Samples represented awide range of CDOM absorptionalong an estuarine-coastal gradientand EEM data were corrected forinner filter effects, blue-shifting theraw fluorescence data. EEM datawere subsequently normalized toprevent undue weight beingassigned to high CDOM samples,fluorescent components wereidentified with the linear un-mixingtechnique of parallel factor(PARAFAC) analysis, andcomponents confirmed with splithalfanalyses to identify twodominant multi-modal componentsto coastal fluorescence with both adirect and an inverse relationship163
INTERNATIONAL SOCIETY FOR THE STUDY OF HARMFUL ALGAE12 th <strong>International</strong> <strong>Conference</strong> on Harmful Algae, Copenhagen, Denmark, 4-8 September 2006with salinity. Other spectral regionsof high variation were identified inthe pool of samples and comparedwith fluorescence peaks in theliterature. Although factors did notcorrelate with cell count or presenceof K. brevis, spatial patterns ofoptical properties and salinity wereused to identify the origins ofcoastal water masses and potentialsources of entrained nutrients.PO.10-38Pseudo-nitzschia along thesouth-central coast of Vietnam:abundance, distribution, T-Scharacteristics, and growth rateof cultures and naturalpopulationsSession: PO.10 - Ecophysiology &autecologyHai Doan-Nhu, Mai Anh T Nguyen,TuongGIA Nguyen-NgocInstitute of Oceanography, NHA TRANG,VietnamPseudo-nitzschia species are widelydistributed along the coast ofVietnam with abundance distributionvarying in time and space. Alongthe southern-central coast,however, they tend to occur in highabundance during the rainy season,when nutrient loading fromland/rivers is high. The seasonalvariation shows local differencesdepending on the hydro-chemicalcharacteristics of each embaymentalong the coast. The Pseudonitzschiaassemblages wereobserved as high as 400.000cells/L, which is close to the level ofshellfish harvesting closure inEurope. Temperature and salinitycompared with cell abundanceindicated that Pseudo-nitzschia mayadapt to a wide range oftemperature and salinities. In NhaPhu Lagoon there were at leastthree different Pseudo-nitzschiaassemblages that grew at (1) lowtemperature and low salinity; (2)high temperature and low salinity;and (3) high temperature and highsalinity, while they were stenohalinebut eurytherm in Nha Trang Bayand the northern coast of BinhThuan waters. Pseudo-nitzschiacuspidata isolated from Nha TrangBay showed the highest growth rateat 35 PSU and 30 °C (1.8 d -1 ), butgrew well at a range from 20-30 °Cand 25-35 PSU. This species maybe a representative of the hightemperature and high salinitypopulations in Nha Trang Bay.PO.13-84Toxicity of Pseudo-nitzschia spp.in estuarine and shelf waters ofLouisiana, USASession: PO.13 - Regional eventsQ Dortch 1 , GJ Doucette 2 , ML Parsons 31 NOAA, SILVER SPRING, United States ofAmerica2 Marine Biotoxins Program NOAA,CHARLESTON, SC, United States ofAmerica3 Marine Science Department, University of,HILO, HAWAII, United States of AmericaPseudo-nitzschia spp. arefrequently widespread and highlyabundant in Louisiana coastalwaters. Seven species have beenidentified, including, P.pseudodelicatissima, P.delicatissima, P. multiseries, P.pungens, P. multistriata, P.subfradulenta, and P. brasiliana.Although several of these areknown producers of domoic acid(DA), no human illness has beenreported. In order to determine ifDA was being produced and, ifpossible, by which species andunder what environmentalconditions, DA content wasmeasured in net tow samples (35164
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12th International Conference on Harmful Algae

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