Pico- and Nanophytoplankton Assemblages in a Subantarctic Ecosystem: The Strait of Magellan
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S. Vanucci
Abstract
Pico- (0.2–2 μm) and small (2–10 μm) nanophytoplanktonic assemblages were investigated along the Strait of Magellan at the beginning of the austral autumn. Three main areas were identified on the basis of hydrological data: an area characterised by high runoff from fjords, a divergence zone and an inland sea in the shallow eastern part of the channel (Paso Ancho). In the study area picophytoplankton abundance ranged from 8.10 × 105 to 3.28 × 107 cells L−1. Cyanobacteria outnumbered picoeukaryotes on average by one order of magnitude; however prokaryotes to picoeukaryotes ratios varied along the Strait. Nanophytoplankton (2.20 × 105 to 5.09 × 106 cells L−1) were mainly represented by cells 2–3 μm (60%, mean value). Picophytoplankton and nanophytoplankton accounted respectively on average for 46% and 27% of the total chlorophyll a which ranged from 0.02 μg L−1 to 1.0 μg L−1 with a mean value of 0.32 μg L−1. Along the Strait phytoplankton displayed quite uniform size structure. Higher chlorophyll a concentrations were observed in the northernmost part of Paso Ancho where microphytoplankton was dominant, while lower chlorophyll a concentrations and lower prokaryotes: picoeukaryotes ratios (2 to 6) were found in the divergence zone.
Copyright (c)1999 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Contents
- Author Index
- Taxonomical Index
- Subject Index
- Species of the Genus Thalassiosira (Bacillariophyceae) from the Gulf of Tehuantepec, Mexico
- Fungi on Juncus roemerianus 12. Two New Species of Mycosphaerella and Paraphaeosphaeria (Ascomycotina)
- A Highly Methylated Agar from Red Seaweed, Gracilaria arcuata
- Effect of Nitrogen Loading on Enzyme Activity of Macroalgae in Estuaries in Waquoit Bay
- The Ultrastructure of Grateloupia filicina (Halymeniaceae, Rhodophyta) Pit Plugs
- Morphology and Taxonomy of Chaetoceros contortus Schütt 1895, with Preliminary Observations on Chaetoceros compressus Lauder 1864 (Subgenus Hyalochaete, Section Compressa)
- Ecology of Sargassum muticum (Phaeophyta) on the North Coast of Spain: IV. Sequence of Colonization on a Shore
- Pico- and Nanophytoplankton Assemblages in a Subantarctic Ecosystem: The Strait of Magellan
- Isolation and partial characterization of giraffine, a lectin from the Mexican endemic alga Codium giraffa Silva
- Two marine species of Cocconeis Ehrenberg (Bacillariophyceae): C. pseudomarginata Gregory and C. caribensis sp. nov.
- Studies on the Structure and Reproduction of Populations of Cystoseira indica (Fucales, Phaeophyta) from Pakistan
