In:
Journal of Phycology, Wiley, Vol. 51, No. 1 ( 2015-02), p. 66-81
Abstract:
Following the identification of the first toxic isolate of D inophysis acuminata from the northwestern A tlantic, we conducted detailed investigations into the morphology, phylogeny, physiology, and toxigenicity of three isolates from three sites within the northeastern U.S./ C anada region: E el P ond and M artha's V ineyard, M assachusetts, and the B ay of F undy. Another isolate, collected from the G ulf of M exico, was grown under the same light, temperature, and prey conditions for comparison. Despite observed phenotypic heterogeneity, morphometrics and molecular evidence classified the three northwestern A tlantic isolates as D . acuminata C laparède & L achmann, whereas the isolate from the G ulf of M exico was morphologically identified as D . cf. ovum . Physiological and toxin analyses supported these classifications, with the three northwestern A tlantic isolates being more similar to each other with respect to growth rate, toxin profile, and diarrhetic shellfish poisoning ( DSP ) toxin content (okadaic acid + dinophysistoxin 1/cell) than they were to the isolate from the G ulf of M exico, which had toxin profiles similar to those published for D . cf. ovum F . S chütt. The DSP toxin content, 0.01–1.8 pg okadaic acid ( OA ) + dinophysistoxin ( DTX 1) per cell, of the three northwestern A tlantic isolates was low relative to other D . acuminata strains from elsewhere in the world, consistent with the relative scarcity of shellfish harvesting closures due to DSP toxins in the northeastern U.S. and C anada. If this pattern is repeated with the analyses of more geographically and temporally dispersed isolates from the region, it would appear that the risk of significant DSP toxin outbreaks in the northwestern A tlantic is low to moderate. Finally, the morphological, physiological, and toxicological variability within D . acuminata may reflect spatial (and/or temporal) population structure, and suggests that sub‐specific resolution may be helpful in characterizing bloom dynamics and predicting toxicity.
Type of Medium:
Online Resource
ISSN:
0022-3646
,
1529-8817
DOI:
10.1111/jpy.2015.51.issue-1
Language:
English
Publisher:
Wiley
Publication Date:
2015
detail.hit.zdb_id:
281226-5
detail.hit.zdb_id:
1478748-9
SSG:
12
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