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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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
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Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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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
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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
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