| Publication Type: | Conference Proceedings |
| Year of Conference: | 2000 |
| Authors: | C. Odebrecht, Ferrario, M. E., Ciotti, A. M., Kitzmann, D., Moreira, O. M. P., Hinz, F. |
| Editor: | G. M. Hallegraef, Blackburn, S. I., Bolch, C. J., Lewis, D. |
| Conference Name: | Harmful Algal Blooms 2000: Proceedings of the Ninth International Conference on Harmful Algal Blooms |
| Pagination: | 42-45 |
| Publisher: | UNESCO |
| Conference Location: | Hobart, Australia |
| Keywords: | abundance, Algal blooms, Argentina, ASW, Biological poisons, brazil, Check lists, diatoms, Environmental Regime:, geographical distribution, identification, Marine, parasites and diseases, Pseudo-nitzschia australis, Pseudo-nitzschia fraudulenta, Pseudo-nitzschia multiseries, pseudo-nitzschia pseudodelicatissima, Pseudo-nitzschia pungens, Q1 01484 Species interactions:, Q5 01505 Prevention and control, Temporal variations, Toxicity |
| Abstract: | The temporal and spatial variability in the abundance of the diatom Pseudo-nitzschia spp. was investigated in shelf and slope surface waters off southern Brazil (Lat 32-34 alpha S, Long 50-53 alpha W). The highest cell numbers were found in spring (mean 104 cells 1 super(-1); maximum 10 super(5) cells 1 super(-1)). In the Lagoa dos Patos estuary (32 alpha S, 52 a15’W) and the adjacent Cassino Beach, the highest abundances were observed in summer/autumn, with maxima of 10 super(5) cells 1 super(-1). The occurrence of diatoms belonging to the genus Pseudo-nitzschia was associated with freshwater outflow from Rio de La Plata and Lagoa dos Patos, and also with offshore fronts generated by the mixing of waters of subantarctic and tropical origin. Five Pseudo-nitzschia species were identified using light, scanning, and transmission electron microscopy: Pseudo-nitzschia fraudulenta, P. pungens, P. multiseries, P. australis and P. pseudodelicatissima. All these species are known as potentially toxic elsewhere, and are also observed off the Argentinian coast (36-48 alpha S), confirming their widespread distribution in the SW Atlantic Ocean and Antarctic origins [6,7]. The main objective of this work was to relate the spatial and temporal variability of the genus Pseudo-nitzschia to oceanographic features of shelf, estuarine and beach waters of the study area. In addition, we report the species occurring in these waters. |
The distribution of the diatom Pseudo-nitzschia off southern Brazil and relationships with oceanographic conditions
Taxonomic name:
Pseudo-nitzschia pseudodelicatissima (Hasle) Hasle emend. Lundholm, Hasle & Moestrup (Taxonomy), Pseudo-nitzschia australis Frenguelli (Taxonomy), Pseudo-nitzschia australis Frenguelli (Taxonomy), Pseudo-nitzschia multiseries (Hasle) Hasle (Taxonomy), Pseudo-nitzschia multiseries (Hasle) Hasle (Taxonomy), Pseudo-nitzschia multiseries (Hasle) Hasle (Taxonomy), Pseudo-nitzschia pseudodelicatissima (Hasle) Hasle emend. Lundholm, Hasle & Moestrup (Taxonomy), Pseudo-nitzschia multiseries (Hasle) Hasle (Taxonomy), Pseudo-nitzschia pungens (Grunow) Hasle (Taxonomy), Pseudo-nitzschia pungens (Grunow) Hasle (Taxonomy), Pseudo-nitzschia pungens (Grunow) Hasle (Taxonomy), Pseudo-nitzschia pungens (Grunow) Hasle (Taxonomy), Pseudo-nitzschia australis Frenguelli (Taxonomy), Pseudo-nitzschia fraudulenta (Cleve) Hasle (Taxonomy), Pseudo-nitzschia pungens var. cingulata (Taxonomy), Pseudo-nitzschia fraudulenta (Cleve) Hasle (Taxonomy), Pseudo-nitzschia fraudulenta (Cleve) Hasle (Taxonomy), Pseudo-nitzschia fraudulenta (Cleve) Hasle (Taxonomy), Pseudo-nitzschia pseudodelicatissima (Hasle) Hasle emend. Lundholm, Hasle & Moestrup (Taxonomy), Pseudo-nitzschia pseudodelicatissima (Hasle) Hasle emend. Lundholm, Hasle & Moestrup (Taxonomy), Pseudo-nitzschia fraudulenta (Cleve) Hasle (Taxonomy), Pseudo-nitzschia australis Frenguelli (Taxonomy), Pseudo-nitzschia multiseries (Hasle) Hasle (Taxonomy), Pseudo-nitzschia pungens (Grunow) Hasle (Taxonomy), Pseudo-nitzschia (Taxonomy), Pseudo-nitzschia pungens var. cingulata (Taxonomy), Diatoms (Taxonomy)