Evaluating the impact of upwelling and/or relaxation periods and of low dissolved oxygen regimes on the Concepcion shelf

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Title: Evaluating the impact of upwelling and/or relaxation periods and of low dissolved oxygen regimes on the Concepcion shelf

Description:

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.

Purpose:

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Supplemental_Information:

REFERENCE: 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.

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Description_of_Geographic_Extent:

Bounding_Coordinates:

West_Bounding_Coordinate: -77.16

East_Bounding_Coordinate: -64.9

North_Bounding_Coordinate: -15.72

South_Bounding_Coordinate: -56.79

Keywords:

Theme:

Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS

Theme_Keyword_Thesaurus: PROJECT

Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS

Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY

Theme_Keyword_Thesaurus: DATA SET LANGUAGE

Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN

Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CIRCULATION > FRESH WATER FLUX

Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CIRCULATION > UPWELLING/DOWNWELLING

Theme_Keyword: EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > TELECONNECTIONS > EL NINO SOUTHERN OSCILLATION (ENSO) > ENSO

Theme_Keyword: EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES

Theme_Keyword: EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS > BENTHIC HABITAT

Theme_Keyword: EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS > COASTAL HABITAT

Theme_Keyword: EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS > PELAGIC HABITAT

Theme_Keyword: EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS > MARINE HABITAT

Theme_Keyword: EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOMASS DYNAMICS

Theme_Keyword: EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > OXYGEN DEMAND

Theme_Keyword: EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > COMMUNITY DYNAMICS > COMMUNITY STRUCTURE

Theme_Keyword: GLOBEC > GLOBAL OCEAN ECOSYSTEM DYNAMICS, IGBP

Theme_Keyword: IGBP > INTERNATIONAL GEOSPHERE-BIOSPHERE PROGRAMME

Theme_Keyword: Benthos

Theme_Keyword: Chile

Theme_Keyword: El Nino

Theme_Keyword: Fondap-humboldt

Theme_Keyword: Freshwater Input

Theme_Keyword: Globec

Theme_Keyword: Oxygen Minimum Layer

Theme_Keyword: Thioploca

Theme_Keyword: Upwelling

Theme_Keyword: BIOTA

Theme_Keyword: CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Theme_Keyword: GEOSCIENTIFIC INFORMATION

Theme_Keyword: OCEANS

Theme_Keyword: SPANISH

Theme_Keyword: ENGLISH

Place:

Place_Keyword_Thesaurus: GCMD

Place_Keyword: OCEAN > PACIFIC OCEAN > SOUTH PACIFIC OCEAN

Place_Keyword: CONTINENT > SOUTH AMERICA > CHILE

Access_Constraints: Not Available

Use_Constraints:

Not Available

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: RUBEN ESCRIBANO

Contact_Position: INVESTIGATOR

Contact_Address:

Address_Type: Mailing and Physical Address

Address: University of Antofagasta

Address: PO Box 170

City: Antofagasta

Country: Chile

Contact_Electronic_Mail_Address: rescribano@uantof.cl

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Attribute_Accuracy:

Attribute_Accuracy_Report:

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Logical_Consistency_Report:

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Completeness_Report:

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Lineage:

Process_Step:

Process_Description:

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Process_Date: Unknown

Spatial_Reference_Information:

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: UDEC/EBMD > Estacion de Biologia Marina-Dichato, Universidad de Concepcion, Chile

Contact_Person: PROF. VICTOR A GALLARDO

Contact_Position: DATA CENTER CONTACT

Contact_Address:

Address_Type: Mailing and Physical Address

Address: Fondap-Humboldt Program Office

Address: Estacion de Biologia Marina-Dichato (EBMD)

Address: Universidad de Concepcion

City: Concepcion

Country: Chile

Contact_Voice_Telephone: +56 41 683247

Contact_Facsimile_Telephone: +56 41 683902

Contact_Electronic_Mail_Address: vgallar@udec.cl

Resource_Description: GLOBEC_040_CHL_004

Distribution_Liability:

Not Available

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: Not Available

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

http://www.udec.cl/carreras/bmarina.html

Access_Instructions:

DATA CENTER URL

Digital_Transfer_Option:

Fees: Not Available

Metadata_Reference_Information:

Metadata_Date: 20010808

Metadata_Review_Date: 20050419

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: GLOBEC IPO

Contact_Position: DIF AUTHOR

Contact_Address:

Address_Type: Mailing and Physical Address

Address: GLOBEC International Project Office

Address: Plymouth Marine Laboratory

Address: Prospect Place

City: Plymouth

Postal_Code: PL1 3DH

Country: UK

Contact_Voice_Telephone: +44 (0)1752 633401

Contact_Facsimile_Telephone: +44 (0)1752 633101

Contact_Electronic_Mail_Address: globec@pml.ac.uk

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time