Primary production and sedimentation during spring in the Antarctic Peninsula region

Bodungen, Bodo von; Smetacek, Victor; Tilzer, Max M.; Zeitzschel, Bernt

doi:10.1016/0198-0149(86)90117-2

Cited by 238 publications

(73 citation statements)

References 18 publications

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“…The latest findings from the JGOFS disprove many previous long-held notions, and suggest high production during the northeast monsoon (Smith et al 1998;Burkill et al 1993;Prasanna Kumar et al 2000). Aggregation and sinking flux of organic matter following phytoplankton blooms are common in marine ecosystems (Takahashi 1986;Bodungen et al 1986), including the Arabian Sea where seasonal changes in sedimentation rates are high (Nair et al 1989;Haake et al 1993). The Arabian Sea also has an extensive denitrification zone at mid depths (Naqvi 1994;Naqvi et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Abundance and relationship of bacteria with transparent exopolymer particles during the 1996 summer monsoon in the Arabian Sea

et al. 2000

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Bacterial abundance and production, numbers, sizes and concentrations of transparent exopolymer particles (TEP) and total organic carbon (TOC) were measured during the 1996 summer monsoon to understand the relationship between TEP, the most labile particulate organic carbon, and bacteria. While high regional variability in the vertical distribution of TOC was discernible, TEP concentrations were high in surface waters at 18--20 N along 64 E with concentrations well over 25 mg alginic acid equivalents l À1 due to upwelling induced productivity. Their concentrations decreased with depth and were lower between 200 and 500 m. Bacterial concentrations were up to 1.99 Â 10 8 l À1 in the surface waters and decreased by an order of magnitude or more at depths below 500 m. A better relationship has been found between bacterial abundance and concentrations of TEP than between bacteria and TOC, indicating that bacterial metabolism is fueled by availability of TEP in the Arabian Sea. Assuming a carbon assimilation of 33%, bacterial carbon demand (BCD) is estimated to be 1.017 to 4.035 g C m À2 d À1 in the surface waters. The observed TEP concentrations appear to be sufficient in meeting the surface and subsurface BCD in the northern Arabian Sea.

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Section: Introductionmentioning

confidence: 99%

Abundance and relationship of bacteria with transparent exopolymer particles during the 1996 summer monsoon in the Arabian Sea

et al. 2000

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“…Holm-Hansen et al 1977: EI-Sayed ct al. 1983: Bodungen et al 1986: Wilson et al 1986: Holm Hansen and Mitchell 1991: Helbling et al 1995. Pro duction associated With marginal icc zones (cf.…”

Section: Introductionmentioning

confidence: 99%

High-resolution time-series data for 1991/1992 primary production and related parameters at a Palmer LTER coastal site: implications for modeling carbon fixation in the Southern Ocean

Moline

Prézelin

1997

Polar Biol

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Our goal was to provide a high-resolution temporal data base for modeling primary produclion in shelf waters adjacent to Palmer Station. AllIarctica. Here. the resulting 1991 1992 data base is used to: (I) determine in situ productivity over a range of seasonal to subseasonal timc scales: (2) idcntify time scalcs of significant variability in marine productivity during the peak growing season: (3) identify environmental, ex perimental and analytical factors that can significantly impact the accuracy of daily. weekly and seasonal pro ductivity estimates: and (4) integrate our findings with previous studies of Antarctic coastal primary pro duction. Data were gathered every 2-3 days during a 3-month period in the austral spring summer of 1991 1992. PholOsynthesis-irradiance (1'-1) relation ships were determined throughout the euphotic zone and 1'-1 parameters. combined with knowledge of the in-water light field, were used to derive instantaneous rates of in situ primary production. Additionally. week ly samples were collected from surface and chlorophyll a maxima for characterization of the patterns of diel periodicity in 1'-1 parameters. Seven diel patterns were discerned over the season and used to time-correct instantaneous measurements and derive noontime. daily. monthly and seasonally integrated estimatcs of production. During the season. a large bloom was responsible for some of the highest daily produc tivity rates reported for the SOllthern Ocean (0.8 gCm-3 d-I , 6.3 gCm-2 d-1 ). Significant vari ation in daily integrated rates occurred generally on time scales less than a wcek. Peak timing and magni tude of daytime periodicities in photosynthesis varied widely over the season, closely coupled to changes in phytoplankton community composition. Instan taneous measurements of primary production, if uncorrected or improperly corrected for daytime periodicities in carbon fixation. were unreliable pre dictors of production on longer time scales even if the water column was sampled every few days. High fre quency sampling and considcration of diet periodicity may be requirements when attempting to discern differ ences between short time-scale variability and long term trends in Antarctic primary production.

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“…The whole Magellan Straits system seems to be more similar to mid latitude environments than to an actual periantarctic system. POM concentration and composition appear to be primarily affected by the hydrological conditions (El Sayed and Fryxell, 1993;Von Bodungen et al, 1986;Berdalet et al, 1997;Povero et al, 1998;Talbot et al, 1997). The starting point of organic matter production generally appears to be the stratification of the water masses, induced by seasonal warming and/or local fresh water inputs.…”

Section: Discussionmentioning

confidence: 99%

Particulate organic matter composition in a semi-enclosed Periantarctic system: the Straits of Magellan

Fabiano¹,

Pedrini²,

Danovaro³

et al. 1999

Sci. Mar.

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SUMMARY: The elemental and biochemical composition of particulate organic matter (POM) was investigated in the Straits of Magellan during February-March 1991. Twenty-two stations were selected in order to identify different areas of the Magellan ecosystem from a trophic point of view. The Strait of Magellan can be divided into three subsystems characterized by different hydrological and geomorphological conditions. Seston concentrations were mostly constrained by physical events, particularly the influence of oceanic and land run-off water inputs and the strong vertical mixing and resuspension events. POM composition displayed quali-quantitative differences between the three areas. In the first subsystem, influenced by Pacific waters, the low seston and POM concentrations and the high POC/Chl-a ratio values indicated the general predominance of the detrital and heterotrophic fractions. In the second subsystem, characterized by superficial stratification, higher seston and organic matter concentrations and lower values of POC/Chl-a ratio were found, indicating that this subsystem was influenced by an active autotrophic component. Shallow waters with intense tidal regime and strong vertical mixing characterized the third subsystem, connected to the Atlantic Ocean, which displayed an increasing importance of the inorganic fraction (values of the POC/TSM ratio lower than in the other systems). Moreover, the third subsystem showed higher values of the RNA/DNA ratio, possibly indicating that resuspension events may enhance the metabolic state of the organic particles mainly dominated by heterotrophic components.Key words: Particulate organic matter, biochemical composition, Straits of Magellan . RESUMEN: COMPOSICIÓN DE LA MATERIA ORGÁNICA PARTICULADA EN UN SISTEMA PERIANTÁRTICO SEMI-CERRADO: EL ESTRE-CHO DE MAGALLANES. -Se estudió la composición elemental y bioquímica de la POM (materia orgánica particulada) en el Estrecho de Magallanes durante el periodo febrero-marzo de 1991. Se eligieron 22 estaciones a fin de identificar diferentes áreas del ecosistema magallánico desde un punto de vista trófico. De acuerdo con las características hidrológicas y geomorfológicas dicho Estrecho se puede dividir en 3 subsistemas. Las concentraciones de seston estuvieron condicionadas, principalmente, por los fenómenos físicos y, en particular, por los aportes oceánicos y terrestres, por la mezcla vertical y por los fenómenos de resuspensión. La composición de la materia orgánica particulada (POM) mostró diferencias cualitativas y cuantitativas en las tres áreas. En el primer subsistema, influenciado por las aguas del Océano Pacífico, las bajas concentraciones de seston y POM y los altos valores de la relación POC/clorofila a indicaron una predominancia general de las fracciones detrítica y heterótrofa. En el segundo subsistema, caracterizado por una estratificación superficial, se encontraron altas concentraciones de seston y de materia orgánica y bajos valores de la relación POC/clorofila a, señalando una influencia de la componente...

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Primary production and sedimentation during spring in the Antarctic Peninsula region

Cited by 238 publications

References 18 publications

Abundance and relationship of bacteria with transparent exopolymer particles during the 1996 summer monsoon in the Arabian Sea

Abundance and relationship of bacteria with transparent exopolymer particles during the 1996 summer monsoon in the Arabian Sea

High-resolution time-series data for 1991/1992 primary production and related parameters at a Palmer LTER coastal site: implications for modeling carbon fixation in the Southern Ocean

Particulate organic matter composition in a semi-enclosed Periantarctic system: the Straits of Magellan

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