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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


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.

Parent DIF
This description is a member of a collection. The collection is described in
GLOBEC_023_CHL_001


Geographic Coverage
 N: -15.72 S: -56.79  E: -64.9  W: -77.16

Location Keywords
OCEAN > PACIFIC OCEAN > SOUTH PACIFIC OCEAN
CONTINENT > SOUTH AMERICA > CHILE


Science Keywords
OCEANS >OCEAN CHEMISTRY >OXYGEN    [Definition]
OCEANS >OCEAN CIRCULATION >FRESH WATER FLUX    [Definition]
OCEANS >OCEAN CIRCULATION >UPWELLING/DOWNWELLING    [Definition]
CLIMATE INDICATORS >ATMOSPHERIC/OCEAN INDICATORS >TELECONNECTIONS >EL NINO SOUTHERN OSCILLATION (ENSO) >ENSO    [Definition]
BIOLOGICAL CLASSIFICATION >ANIMALS/INVERTEBRATES    [Definition]
BIOSPHERE >ECOSYSTEMS >MARINE ECOSYSTEMS >BENTHIC    [Definition]
BIOSPHERE >ECOSYSTEMS >MARINE ECOSYSTEMS >COASTAL    [Definition]
BIOSPHERE >ECOSYSTEMS >MARINE ECOSYSTEMS >PELAGIC    [Definition]
BIOSPHERE >ECOSYSTEMS >MARINE ECOSYSTEMS    [Definition]
BIOSPHERE >ECOLOGICAL DYNAMICS >ECOSYSTEM FUNCTIONS >BIOMASS DYNAMICS    [Definition]
BIOSPHERE >ECOLOGICAL DYNAMICS >ECOSYSTEM FUNCTIONS >OXYGEN DEMAND    [Definition]
BIOSPHERE >ECOLOGICAL DYNAMICS >COMMUNITY DYNAMICS >COMMUNITY STRUCTURE    [Definition]


ISO Topic Category
BIOTA
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
GEOSCIENTIFIC INFORMATION
OCEANS


Project
GLOBEC >Global Ocean Ecosystem Dynamics, IGBP    [Information]
IGBP >International Geosphere-Biosphere Programme    [Information]


Keywords
BENTHOS
CHILE
EL NINO
FONDAP-HUMBOLDT
FRESHWATER INPUT
GLOBEC
OXYGEN MINIMUM LAYER
THIOPLOCA
UPWELLING


Data Center
Estacion de Biologia Marina-Dichato, Universidad de Concepcion, Chile    [Information]
Data Center URL: http://www.udec.cl/carreras/bmarina.html

Data Center Personnel
Name: PROF. VICTOR A GALLARDO
Phone: +56 41 683247
Fax: +56 41 683902
Email: vgallar at udec.cl
Contact Address:
Fondap-Humboldt Program Office
Estacion de Biologia Marina-Dichato (EBMD)
Universidad de Concepcion
City: Concepcion
Country: Chile


Personnel
RUBEN ESCRIBANO
Role: INVESTIGATOR
Email: rescribano at uantof.cl
Contact Address:
University of Antofagasta
PO Box 170
City: Antofagasta
Country: Chile


GLOBEC IPO
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: 2016-01-27



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