NDLI: C~munidades microplanctônicas no Oceano Atlântico Sul Ocidental: biomassa e distribuição em novembrode 1992 (Microplankton communities in the Southwestern Atlantic Ocean: biomass and distribution in November/1992)

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C~munidades microplanctônicas no Oceano Atlântico Sul Ocidental: biomassa e distribuição em novembrode 1992 (Microplankton communities in the Southwestern Atlantic Ocean: biomass and distribution in November/1992)

Content Provider	Semantic Scholar
Author	Fernandesl, Luciano F. Brandini, Frederico Pereira
Copyright Year	1999
Abstract	ti Abstract: The biomass distribution and the cOníposition of the microplankton (I0-200llm) were investigated along a transect between Southern Brazil (25°30'S) and Antarctic Peninsula (62°05'S) in November/1992. Biomass peaks were observed at Polar Front (PF) and Brazil-Malvinas Confluence Zone (BMCZ) (0.84-1.23 Ilg Chl.a/l). Adjacent waters showed low biomass indicating low productivity, with similar average values for Antarctic Water (0.18 Ilg/l) and Subtropical Water (0.27 Ilg/l), where a bloom of Trichodesmium erythraeum was detected. Subantarctic waters over the oceanic province around the Patagonian shelf represented a notable exception, with peaks in phytoplankton biomass (up to 2.46 Ilg Chl.a/l). Those areas of enhanced biomass were diatom-dominated; the Prymnesiophyceae Phaeocystis was abundant in some stations. Both fronts presented similar values of chlorophyll-a, indicating that environrnents with distinctive characteristics could support blooms of the same magnitude. Weakly silicified diatoms (Hemiaulus, Leptocylindrus, Thalassiosira) dominated to the north of the BMCZ, while heavily silicified species (Asteromphalus, Chaetoceros afL neglectus, Fragillariopsis kerguelensis, Proboscia, Pseudonitzschia sp., Rhizosolenia) formed the bulk of phytoplankton at the PF, reflecting the different chemical characteristics of the water masses. The diatoms occurring in the PF appear to be recurrent and widely distributed along different longitudes over the Antarctic Circumpolar Current. Ciliates and heterotrophic dinoflagellates were dominant at Subtropical Water and to the north ofBMCZ, and seemed to respond quickly to the increasing phytoplankton biomass.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.scielo.br/pdf/rboce/v47n2/07.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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