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Vulnerability of Antarctic marine benthos to increased temperatures and ocean acidification associated with climate change

Entry ID: AAS_3134

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Summary

Abstract: Metadata record for data from AAS (ASAC) project 3134.

Data from this project will be available via the child records.

Public
Ocean acidification and warming are global phenomena that will impact marine biota through the 21st century. This project will provide urgently needed predictive information on the likely survivorship of benthic invertebrates in near shore Antarctic environments that is ...

Related URL

Link: VIEW PROJECT HOME PAGE

Description: Public information for AAS project 3134

Link: VIEW RELATED INFORMATION

Description: Citation reference for this metadata record and dataset

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: -68.3

S: -68.8

E: 78.0

W: 77.8

Temporal Coverage

Start Date: 2009-09-30

Stop Date: 2012-03-31

Location Keywords

OCEAN > SOUTHERN OCEAN

CONTINENT > ANTARCTICA

GEOGRAPHIC REGION > POLAR

Science Keywords

OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE

BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES

ISO Topic Category

BIOTA

ENVIRONMENT

OCEANS

Platform

FIELD SURVEYS

LABORATORY

FIELD INVESTIGATION

Quality The values provided in temporal and spatial coverage are approximate only.

Taken from the 2009-2010 Progress Report:
Variations to work plan or objectives:
The main focus of experiments were changed from fertilisation and larval development of invertebrates to calcification of juvenile echinoderms with existing skeleton under predicted ocean warming and acidification ... scenarios. This occurred because adults of S. neumayeri collected around Davis had already passed their spawning period by the time the aquarium field module was set-up and running. Eight trials on L. elliptica were conducted to see if they were a good substitute species, but all attempts were unsuccessful.

Field work:
Initial collection of S. neumayeri were carried out around Davis station, mostly through snorkelling around Ellis Fjord. A. nimrodi were collected for us by the divers and were mostly taken from the mouth of Heidemann Bay. L. elliptica were also collected by the divers, however they were obtained from a variety of locations. Animals were collected as and when we needed them.

Laboratory activity/analysis:
Animals were dissected no later than a couple of days after they were brought in by divers.

For experiments involving A. nimrodi, juveniles were collected from the brood pouch of the parent and separated into two classes (early and late) of juveniles. They were then photographed individually and placed into our treatments in batches of 10. Experiments were run for 4 weeks in order to see a stronger effect of ocean warming and acidification on calcification. After 4 weeks, juveniles were taken out and photographed again to document any changes, then they were preserved in trace amounts of 2.5% glutaraldehyde and returned to Australia for further analysis. A total of 2 trials were conducted.

For L. elliptica, animals were dissected and strip-spawned to obtain gametes. These gametes were fertilised under different sperm concentrations in order to discover the optimal sperm concentration needed for this species for a successful fertilisation. Eggs which were mixed with sperm were stored in controlled temperature cabinets for 48 hours to see if fertilisation had occurred. However, 8 trials were conducted and none were successful.

Difficulties affecting project:
There were initial difficulties with the setting-up of the field aquarium module as parts needed were not available. However, these have all been solved, and we do not expect it to interfere with the experimental design. However, further work involving A. nimrodi might not be possible for future seasons as these animals can only be collected through diving, and there might not be a dive team present on station for the following season.

Access Constraints See the child records for access to the data.

Use Constraints This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_3134 when using these data.

Ancillary Keywords

Ocean acidification

Climate Change

Data Set Progress

COMPLETE

Data Center

Australian Antarctic Data Centre, Australia

Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC Phone: +61 3 6232 3244 Fax: +61 3 6232 3351 Email: metadata at aad.gov.au Contact Address: Australian Antarctic Division 203 Channel Highway City: Kingston Province or State: Tasmania Postal Code: 7050 Country: Australia