Effect of Coastal Upwelling on Nitrogen Regeneration from Sediments and Ammonium Supply to the Water Column in Concepcion Bay, Chile

Farı́as, Laura; Chuecas, L.; Salamanca, Marco

doi:10.1006/ecss.1996.0062

Cited by 27 publications

(13 citation statements)

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“…supply of regenerated N, P and even Fe from sediment to bottom water (Farías et al, 1996;Graco et al, 2006;Fennel, 2010), which in turn controls NPP (Ryther and Dunstan, 1971). Thus, the Atlantic EBUS are also characterized by a wider continental shelf and higher NPP as compared to the Pacific, where the Humboldt EBUS presents higher productivity than the California FIGURE 7 | Temporal evolution of standardized anomaly for in situ and satellite Net Primary Production (NPP, A), temporal evolution of the Oceanic Niño Index (B) and cumulative satellite NPP estimations by year (C), climatological NPP mean with 95% confidence interval (markers and shaded area, respectively, D) and mean satellite-derived NPP values during El Niño, La Niña, and Neutral conditions (E).…”

Section: Discussionmentioning

confidence: 99%

Temporal Variability in Net Primary Production in an Upwelling Area off Central Chile (36°S)

Testa

Masotti

2018

Front. Mar. Sci.

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The temporal variability of Net Primary Production (NPP) off central Chile (36 • S, 73 • W), an area subjected to seasonal coastal upwelling, was analyzed using monthly in situ 13 C incubations within the photic zone, along with bio-oceanographic variables from a fixed time series station; and satellite NPP estimations (NPPE) from the Vertically Generalized Production Model between 2006 and 2015. NPP and NPPE rates varied from 0.03 to 18.29 and from 0.45 to 9.07 g C m −2 d −1 , respectively. Both rates were fairly well correlated with each other (r 2 = 0.61), but when these data were separated into two periods, higher r 2 value was found during winter (r 2 = 0.70) with respect to the rest of the year (r 2 = 0.24); the latter correlation was partially due to increased weekly NPPE variability during active and relaxed upwelling events. NPP rates along with other biophysical variables allowed for a division of the annual cycle into three distinct periods: September to January (high productivity, mean integrated NPP rates of 4.0 g C m −2 d −1 ), February to March (intermediate productivity, mean integrated NPP rates of 1.4 g C m −2 d −1 ), and May to August (basal level, mean integrated NPP rates of 0.5 g C m −2 d −1 ). NPP appeared to be partially controlled by nutrient inputs, either from upwelling (September-April) and river discharge (May-August), maintaining high NPP rates throughout the entire year, with an annual mean NPP rate of 1.1 kg C m −2 yr −1 . In this region, El Niño Southern Oscillation events did not appear to impact the NPP interannual variability.

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Section: Discussionmentioning

confidence: 99%

Temporal Variability in Net Primary Production in an Upwelling Area off Central Chile (36°S)

Testa

Masotti

2018

Front. Mar. Sci.

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“…Studies to examine flux rates from consolidated gytjja sediment through the flocculant gytjja layer to the water column in Myall Lake reveal a significant injection of phosphorus to the water column-internal loading (Siong and Asaeda 2006). Other studies (e.g., Farias et al 1996;Caetano et al 1997) have reported similar results as far as nutrient flux rates in other lakes were concerned. Lake Myall is rich in macrophytes (DLWC 1998) and in late summer, these macrophytes die and thus triggering a decomposition process.…”

Section: Phosphorus In Sediment and Water Column And Their Relationshmentioning

confidence: 80%

Phosphorus concentration in sediment, water and tissues of␣three submerged macrophytes of Myall Lake, Australia

Shilla

Asaeda

Siong

et al. 2006

Wetlands Ecol Manage

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Phosphorus content in sediment, water and tissues of three macrophyte species growing in Myall Lake, Australia were studied from January to November, 2004. The sites investigated were North-West (NW), North-East (NE), South-West (SW) bays and Central deep area of the lake (CL). The objective of this study was to investigate how total phosphorus (TP) in plant tissues relate to phosphorus pools and the role played by the aquatic macrophyte species under investigation in phosphorus recycling in the lake. Of the four investigated sites of the lake, TP in plant tissues were significantly higher in NorthWest and South-West bays compared to the rest. Najas marina had significantly higher TP content (e.g., 1.55 and 1.44 mg/g dw.; P < 0.05) for NW and SW respectively, than the other two species. N. marina is a rooted macrophyte while charophytes (C. fibrosa and Nitella hyalina) are pseudorooted macrophytes. Total phosphorus in the sediment and water column were significantly higher in Central deep area of the lake compared to the other three bays (P < 0.05, n 5). Soluble reactive phosphorus (SRP) and total dissolved phosphorus (TDP) in sediment pore water correlated significantly with phosphorus content in the tissue of N. marina ( r 2 SRPÀN: marina ¼ 0:95; r 2 TDPÀN: marina ¼ 0:92) as well as TP in sediment ( r 2 SRPÀTP ¼ 0:90 and r 2 TDPÀTP ¼ 0:81). Using the two-compartmental uptake model, it was observed that, sediment was the main compartment through which Ni. hyalina obtained phosphorus while for the other two species, water column was the uptake route for the phosphorus. These correlations suggest that, water column and sediments are important pathways for phosphorus uptake in plants.

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“…Previous reports on ammonium fluxes within the bay indicated higher values, between 5 and 9 mmol m -2 day -1 (Farías et al 1996, Thamdrup & Canfield 1996, when the normal "anoxic" conditions were present. During the sampling period a lower amount of organic matter was settled with oxic conditions prevailing, evidenced this by lower Chl-a concentrations in surface sediments (Table 1) compared to those reported for other periods (~165 and 1,120 mg g -1 in November 1998and March 1999, respectively, Gutiérrez 2000, Graco et al 2001.…”

Section: Benthic Ammonium Flux At the Sediment-water Interfacementioning

confidence: 83%

“…High C oxidation rates are reported at the sediment surface, mainly through sulfate reduction (Thamdrup & Canfield 1996, Ferdelman et al 1997, and ammonium fluxes to the overlying waters are about 10 mmol m -2 day -1 (Farías et al 1995(Farías et al , 1996. Nematodes represent more than 96 % of the meiofauna (Neira et al 2001), and macrofauna during nonEl Niño years is dominated (85 %) by the polychaete Parapronospio pinnata (Carrasco 1986).…”

Section: Study Sitementioning

confidence: 99%

“…A large fraction (ca. 25-40 %) of the primary production settles to the bottom (Bernal et al 1989), where the major fraction of it is remineralized and its products, such as ammonium, released to the water column (Farías et al 1996). The warm phase of El Niño Southern Oscillation (ENSO) cycle in the tropical Pacific, i.e., El Niño, has been associated with climatic and economic impacts around the globe.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nitrogen sediment fluxes in an upwelling system off central Chile (Concepción Bay and adjacent shelf) during the 1997-1998 El Niño

Muñoz

Salamanca

Neira

et al. 2004

Rev. chil. hist. nat.

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Effect of Coastal Upwelling on Nitrogen Regeneration from Sediments and Ammonium Supply to the Water Column in Concepcion Bay, Chile

Cited by 27 publications

References 0 publications

Temporal Variability in Net Primary Production in an Upwelling Area off Central Chile (36°S)

Temporal Variability in Net Primary Production in an Upwelling Area off Central Chile (36°S)

Phosphorus concentration in sediment, water and tissues of␣three submerged macrophytes of Myall Lake, Australia

Nitrogen sediment fluxes in an upwelling system off central Chile (Concepción Bay and adjacent shelf) during the 1997-1998 El Niño

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