Southern Ocean Calcareous Zooplankton Response to Ocean Acidification

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Southern Ocean Calcareous Zooplankton Response to Ocean Acidification

Entry ID: ASAC_3046

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Summary

Abstract: Metadata record for data from AAS (ASAC) project 3046.

Public
The overall objective is to characterise the response of Southern Ocean calcareous zooplankton to ocean acidification resulting from anthropogenic CO2 emissions. Simulated increases in anthropogenic CO2 suggest a reduction in the calcification rates of calcareous organisms. A change in the calcification in the Southern Ocean may cause ... marine ecosystem shifts and in turn alter the capacity for the ocean to absorb CO2 from the atmosphere. We plan to take advantage of naturally-occurring, persistent, zonal variations in Southern Ocean primary production and biomass to investigate the effects of CO2 addition from anthropogenic sources on Southern Ocean calcareous zooplankton communities.

A download file containing an excel spreadsheet of data can be found at the provided URL.

Project objectives:
The overall objective of this project is to characterise the impacts of recent, primarily anthropogenic, increases in atmospheric CO2 and related changes in the carbonate chemistry on shell formation by calcareous zooplankton in the Australian sector of the Southern Ocean. Calcareous zooplankton (e.g. planktonic foraminifera and pteropods) will be collected using plankton nets at five Southern Ocean localities during high seasonal flux periods. Planktonic foraminiferal and pteropod species and abundances, calcification rates and geochemistry (stable isotope and trace-metal) will be determined on plankton tow samples. Data from recent plankton tow samples will be compared with data deposited historically in the Southern Ocean and recovered from existing deep ocean sediment cores to provides insights about the extent to which modern carbon conditions may have already generated ecological impacts. The project will also provide a baseline of the present-day impact of ocean acidification and can be used to monitor the influence of future anthropogenic CO2 emissions in Southern Ocean ecosystems.

Taken from the 2008-2009 Progress Report:
Progress against objectives:
Because of logistical delays to the Aurora Australis shipping schedule, ship time for this project was deferred to the 2009/2010 season. We have made progress in analysing other materials form previous voyages which will assist in the sampling design for the upcoming season. We are making good progress in planning the upcoming voyage currently scheduled for late 2009.

Taken from the 2009-2010 Progress Report:

Progress against objectives:
Project scientists participated in Voyage 2 of the Aurora Australis, from Hobart to Casey Station in December 2009. Using the Rectangular Midwater Trawl we collected a total of eight plankton samples for examination of calcareous plankton distribution and shell characteristics in the summer Southern Ocean. We were targeting pteropods and planktonic foraminifera, two sets of calcifiers whose calcification response to ocean acidification we had previously reported on in publications in Nature Geoscience, Biogeosciences Discussions, and Deep-Sea Research Part II (in press). Project participants included collaborators from Australian National University and Scottish Natural Heritage, UK.

There were low abundance of planktonic calclfiers in this particular seasons and sector, but we consider the initial collection a god start. Samples included approx. 18 pteropods; other samples are still being held by Biosecurity Australia and will be examined as soon as they are released. Other samples have already been sent to researchers at the Australian Institute of Marine Science for genetic (RNA) sequencing. This latter collaboration is a key one which will help answer questions about evolutionary responses to ocean acidification; if there are genotypes which are more or less vulnerable to acidification we may already be seeing selective pressure in the ecosystem and a change in the structure of assemblages as "winners" and "losers" are differentially affected by the impact.

Related URL

Link: GET DATA

Description: Download point for the data

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: -45.0

S: -68.0

E: 170.0

W: 60.0

Temporal Coverage

Start Date: 2008-09-30

Stop Date: 2011-03-31

Location Keywords

OCEAN > SOUTHERN OCEAN

GEOGRAPHIC REGION > POLAR

Science Keywords

OCEANS > MARINE SEDIMENTS

OCEANS > OCEAN CHEMISTRY > CARBON DIOXIDE

ISO Topic Category

IMAGERY/BASE MAPS/EARTH COVER

Platform

LANDSAT

LANDSAT-4

LANDSAT-5

Instrument

TM > Thematic Mapper

Ancillary Keywords

IMAGE

LANDSAT

Originating Center

CRSGS

Data Center

China Remote Sensing Satellite Ground Station, Chinese Academy of Sciences, China

Data Center URL: http://english.ceode.cas.cn/rs/Facilities/GroundStation/200910/t200...
Dataset ID: P-TM-CCT > Processed TM data on CCTs
Dataset ID: P-TM-FLM > Processed TM data on Films
Dataset ID: R-TM-FW > Raw TM data on HDDTs written by FW recorders
Dataset ID: R-TM-PG > Raw TM data on HDDTs written by PG recorders

Data Center Personnel
Name: LIANQUN KOU Phone: +86-1-2553662 Fax: +86-1-2587827 Contact Address: P.O.Box 2434 45 Bei San Huan Xi Rd. City: Beijing Postal Code: 100086 Country: China

Personnel

BEIEN SHAO

Role: INVESTIGATOR

Role: DIF AUTHOR

Role: TECHNICAL CONTACT

Phone: +86-1-2642994

Fax: +86-1-2561215

Contact Address:

45 Bei San Huan Xi Rd.

P.O.Box 2434

City: Beijing

Postal Code: 100086

Country: CHINA

Creation and Review Dates

Last DIF Revision Date: 2012-02-07

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