Pseudonitzschia species found in digestive tracts of northern anchovies [Engraulis mordax)

1995 ◽  
Vol 73 (4) ◽  
pp. 642-647 ◽  
Author(s):  
Kellie L. McGinness ◽  
John D. McEachran ◽  
Greta A. Fryxell
Keyword(s):  
Domoic Acid ◽  
Stomach Contents ◽  
Monterey Bay ◽  
Diatom Species ◽  
Surface Seawater ◽  
Surrounding Water ◽  
Near Surface ◽  
Pseudonitzschia Australis ◽  
Engraulis Mordax ◽  
Pennate Diatoms

The diatom species Pseudonitzschia australis Frenguelli has been implicated as the source of the domoic acid that contaminated anchovy species in Monterey Bay, California, during 1991. In other geographic areas, as well as in laboratory cultures of isolates obtained from various geographic areas, other Pseudonitzschia species have been shown to produce domoic acid. The stomach contents of anchovies caught in Monterey Bay during the following summer were analyzed to identify and determine the abundance of each of the Pseudonitzschia species present. Pseudonitzschia species present in net-tow samples taken at the same time from Monterey Bay were also recorded. In the stomach samples, nine different Pseudonitzschia species were found, including four that have produced domoic acid either under natural or laboratory conditions. These findings illustrate the risk of possible neurotoxin accumulation inherent in the diets of the anchovies studied. The planktophagous diet of the anchovies reflected the plankton composition of the surrounding water and also demonstrates the anchovies' ability to filter pennate diatoms from the near-surface seawater.

SEM observations of bloom-forming toxic diatoms from Monterey Bay, California

1992 ◽  
Vol 50 (1) ◽  
pp. 832-833
Author(s):  
E. A. Hale ◽  
J. M. Krupp ◽  
D. L. Garrison
Keyword(s):  
Domoic Acid ◽  
Stomach Contents ◽  
Late Summer ◽  
Paralytic Shellfish Poisoning ◽  
Monterey Bay ◽  
Shellfish Poisoning ◽  
Paralytic Shellfish ◽  
Northern Anchovy ◽  
High Concentrations ◽  
Pseudonitzschia Australis

In the late summer of 1991, large numbers of seabirds in northern Monterey Bay, California died after showing unusual neurological symptoms. The first suspects were dinoflagellates, planktonic algae known to produce the toxins responsible for paralytic shellfish poisoning (PSP). Although toxic dinoflagellates were found, no evidence for PSP was present. Subsequent chemical analysis of tissue and stomach contents from affected birds and from locally collected northern anchovy showed high concentrations of domoic acid. During the seabird kill in Monterey Bay, the plankton was dominated by Pseudonitzschia australis (=Nitzschia pseudoseriata) a diatom not previously known to produce domoic acid.

scholarly journals Autecology of the diatom Pseudonitzschia australis, a domoic acid producer, from Monterey Bay, California

1992 ◽  
Vol 84 ◽  
pp. 293-302 ◽  
Author(s):  
KR Buck ◽  
L Uttal-Cooke ◽  
CH Pilskaln ◽  
DL Roelke ◽  
MC Villac ◽  
...  
Keyword(s):  
Domoic Acid ◽  
Monterey Bay ◽  
Pseudonitzschia Australis

Domoic acid-producing diatom blooms in Monterey Bay, California: 1991-1993

1994 ◽  
Vol 2 (5) ◽  
pp. 271-279 ◽  
Author(s):  
P. M. Walz ◽  
D. L. Garrison ◽  
W. M. Graham ◽  
M. A. Cattey ◽  
R. S. Tjeerdema ◽  
...  
Keyword(s):  
Domoic Acid ◽  
Monterey Bay ◽  
Diatom Blooms

scholarly journals Environmental control on the variability of DMS and DMSP in the Mauritanian upwelling region

2012 ◽  
Vol 9 (3) ◽  
pp. 1041-1051 ◽  
Author(s):  
C. Zindler ◽  
I. Peeken ◽  
C. A. Marandino ◽  
H. W. Bange
Keyword(s):  
Surface Waters ◽  
Coastal Upwelling ◽  
Environmental Control ◽  
Hot Spot ◽  
Local Source ◽  
Surface Seawater ◽  
Near Surface ◽  
Northwest Africa ◽  
N:P Ratios ◽  
A Minor

Abstract. Dimethylsulphide (DMS) and dissolved and particulate dimethylsulfoniopropionate (DMSPd, DMSPp) were measured in near-surface waters along the Mauritanian coast, Northwest Africa, during the upwelling season in February 2008. DMS, DMSPd and DMSPp surface concentrations of up to 10 nmol L−1, 15 nmol L−1 and 990 nmol L−1, respectively, were measured. However, the DMS concentrations measured are in the low range compared to other upwelling regions. The maximum DMSPp concentration is the highest reported from upwelling regions so far, which might indicate that the Mauritanian upwelling is a hot spot for DMSP. Within the phytoplankton groups, dinoflagellates were identified as important contributors to DMS concentrations, while other algae seemed to have only a minor or no influence on DMS and DMSP concentrations. A pronounced switch from high DMSP to high DMS concentrations was observed when the nitrogen to phosphorus ratio (N:P) was below 7. The high DMS/DMSP ratios at N:P ratios <7 indicate that nitrogen limitation presumably triggered a switch from DMSP to DMS independent of the species composition. Our results underline the importance of coastal upwelling regions as a local source for surface seawater sulphur.

Domoic acid in benthic flatfish on the continental shelf of Monterey Bay, California, USA

2007 ◽  
Vol 151 (6) ◽  
pp. 2053-2062 ◽  
Author(s):  
Veronica L. Vigilant ◽  
Mary W. Silver
Keyword(s):  
Continental Shelf ◽  
Domoic Acid ◽  
Monterey Bay
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