Evaluating the impact of upwelling and/or relaxation periods and of low dissolved oxygen regimes on the Concepcion shelf
Entry ID:
GLOBEC_040_CHL_004
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Summary
Abstract:
Evaluating the impact of upwelling and/or relaxation periods and of low dissolved oxygen regimes on the structure and functioning of the benthic community on the Concepcion shelf The marine environment off central Chile is an important site of coastal upwelling subject to seasonal and episodic shifts in wind strength. A moderate oxygen minimum and nutrient-rich layer, associated with equatorial ... subsurface water (ESSW), are found at intermediate depths with the upper boundary in the upwelling season reaching to ~20m depth. More or less lasting and intense suboxic and anoxic benthic conditions are created due to increased oxygen uptake linked to the seasonal higher input of organic matter and to the extended influence of hypoxic waters. Changes in the composition of ESSW can also result from local and remote physical forcing acting at different time- and space-scales. When oxygen supply falls or demand rises over the benthos, important changes can occur in the dominant metabolic pathways of microbial processes, in sediment and water chemistry, on the nutrient flux across the sediment-water interface, and in the structure and functioning of benthic communities. New and available data was evaluated to evaluate the impact of upwelling and/or relaxation periods, and of low dissolved oxygen regimes on the structure and functioning of the benthic community on the Concepcion shelf.
Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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N: -15.72
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S: -56.79
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E: -64.9
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W: -77.16
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Parent DIF
This data set description is a member of a collection. The
collection is described in
GLOBEC_023_CHL_001
Personnel
Role:
INVESTIGATOR
Email:
rescribano at uantof.cl
Contact Address:
University of Antofagasta
PO Box 170
City:
Antofagasta
Country:
Chile
Role:
DIF AUTHOR
Phone:
+44 (0)1752 633401
Fax:
+44 (0)1752 633101
Email:
globec at pml.ac.uk
Contact Address:
GLOBEC International Project Office
Plymouth Marine Laboratory
Prospect Place
City:
Plymouth
Postal Code:
PL1 3DH
Country:
UK
Publications/References
Published and In press Farias, L., 1998. Potential role of bacterial mats in the nitrogen budget of marine sediments: the case of Thioploca spp. Mar. Ecol. Progr. Ser. 170:291–292 Gallardo, V. A., E. Klingelhoeffer, W. Arntz & M. Graco, 1998. First report of the bacterium Thioploca in the Benguela ecosystem off Namibia. J. Mar. Biol. Assoc. U. K. 78:1007–1010. Gutierrez D., V. A. ... Gallardo, S. Mayor, C. Neira, C. Vasquez, J. Sellanes, M. Rivas, A. Soto, F. D. Carrasco & M. Baltazar, 2000. Effects of dissolved oxygen and fresh organic matter on the bioturbation potential of macrofauna in sublittoral sediments off Central Chile during the 1997/1998 El Nino. Mar. Ecol. Prog. Ser. 202:81–99 Jorgensen, B.B. & V.A. Gallardo, 1999. Thioploca spp.: filamentous sulfur bacteria with nitrate vacuoles. FEMS Microbiol. Ecol. 28: 301-313. Montes, R. & R. A. Quinones. The effect of rainfall and runoff of the Bio-Bio and Itata rivers on the landings of the clams Protothaca thaca and Venus antiqua in central-south Chile. Rev. Chil. Hist. Nat. 72:13-30. (In Spanish). Otte, S., J. Gijs Kuenen, L. P. Nielsen, H. W. Paerl, J. Zopfi, H. N. Schulz, A. Teske, B. Strotmann, V. A. Gallardo, & B. B. Jorgensen, 1999. Nitrogen, carbon and sulphur metabolism in natural Thioploca samples. Appl. Environ. Microb. 65(7):3148-3157. Schulz, H., B. Strotmann, V. A. Gallardo & B. B. Jorgensen, 2000. Population study of the filamentous sulfur bacteria Thioploca spp. off the Bay of Concepcion, Chile. Mar. Ecol. Prog. Ser. 200:117–126. Gonzalez, R. & R. A. Quinones. Pyruvate dehydrogenases involved in anaerobic metabolism in polychaetes of the continental shelf off central-south Chile. Estuar. Coast Shelf Sci. Submitted Schulz, H., T. Brinkhoff, R. Rosello-Mora, B. Strotmann, V. A. Gallardo & B. B. Jorgensen. Two morphotypes of marine Thioploca spp. observed off the coast of Chile. Appl. Environ. Microb. Figueroa, D. & C. Moffat. On the influence of topography in the induction of coastal upwelling along the Chilean coast. Geophys. Res. Lett. Gallardo, V. A., H. Schulz, D. Gutierrez, D. Figueroa, J. Sellanes, C. Neira & L. Cid. ENSO-related biomass variability of giant vacuolated sulfur bacteria in sediments of the Humboldt Current ecosystem. Science. Hormazabal, S., G. Shaffer, J. Letelier & O. Ulloa. Remotely forced modulation of SST in the coastal upwelling system of northern and central Chile. J. Geophys. Res. Montes, R. & R. A. Quinones. Efecto del transporte e inanicion sobre la sobrevivencia de estadios tempranos y/o reclutamiento de las poblaciones de peces marinos en ecosistemas templados. Rev. Chil. Hist. Nat. Quinones, R. A. & R. Montes. [RM1] [RM2] Relationship between freshwater input to the coastal zone and the historical landings of the benthic/demersal fish Eleginops maclovinus in central-south Chile. Fish. Oceanogr. Sobarzo, M. & D. Figueroa. Rise of water in the Biobio River submarine canyon (Chile) as a response to surface winds. Cont. Shelf Res. In preparation Carrasco, F. D., V. A. Gallardo, D. Gutierrez & M. Baltazar. Large temporal changes in the shelf soft bottom macroinfauna off Concepcion Bay, central Chile. Figueroa, D. & C. Moffat. The upwelling off Concepcion, Chile: Annual variability and anomalies. J. Geophys. Res. Gallardo, V. A. et al. Evolutionary implications of benthic colonization in extreme hypoxia and bacterial mat development under the Peru-Chile Subsurface Countercurrent. Mar. Ecol. Prog. Ser. Neira, C., J. Sellanes, A. Soto, D. Gutierrez & V. A. Gallardo. Meiofaunal distribution off central Chile: variations attributed to oxygen and organic matter availability changes during the 1997-98 El Nino. Oceanol. Acta.
Creation and Review Dates
DIF Creation Date:
2001-08-08
Last DIF Revision Date:
2005-04-19
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