02671nas a2200337   4500008004100000020001400041245008400055210006900139260000800208300001200216490000600228520174500234653003201979653002202011653001002033653001502043653001102058653001002069653003702079653001602116653002402132653002102156653002402177653000802201653001102209100001902220700001902239700001902258700002202277856003402299       2007                        eng d  a1568-988300aPseudo-nitzschia species population dynamics in the Quoddy Region, Bay of Fundy0 aPseudonitzschia species population dynamics in the Quoddy Region  cNov  a861-8740 v63 aThe population dynamics of Pseudo-nitzschia species from the Quoddy Region of the Bay of Fundy was examined in a field-based study. Five stations were sampled over a period of 11 weeks during the course of one discrete bloom episode in 2003 with seven species of Pseudo-nitzschia found and enumerated: P. americana, R delicatissima, R pseudodelicatissima, R fraudulenta, P. pungens, R seriata and P subpacifica. We related species abundance to physical and chemical properties of seawater (transparency, fluorescence, silicate, phosphate, nitrite + nitrate, ammonia, nitrite, oxygen, sigma-t, tidal level, tidal state and total depth of water column) using canonical correspondence analysis (CCA) to identify factors explaining the greatest amount of variance in their temporal and spatial distribution patterns. Our results indicate that abundance of species and groups of species correlated well with certain specific chemical and physical properties of seawater. R pseudodelicatissima and P. delicatissima abundance was positively correlated with nitrates and P americana with depth of the water column. R pungens was more abundant in samples with higher concentrations of phosphates and lower concentrations of nitrates. P. seriata abundance was negatively associated with total fluorescence. P. subpacifica and R fraudulenta abundances were not statistically related to any of the variables examined. Our data therefore provides direction for testable, hypothesis driven experiments that could provide predictive insights into the occurrence of certain harmful algal bloom (HAB) species should specific environmental variables be further affected along the gradients extracted in this study. (C) 2007 Elsevier B.V. All rights reserved.10aamnesic shellfish poisoning10aBacillariophyceae10abloom10acalifornia10acanada10acoast10adiatom pseudonitzschia-australis10adomoic acid10apopulation dynamics10aPseudo-nitzschia10apseudodelicatissima10asea10awaters1 aKaczmarska, I.1 aMartin, J., L.1 aEhrman, J., M.1 aLeGresley, M., M.  u<Go to ISI>://000251470600010