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Macquarie Island soil collection site details for 2009/10 season - Azorella dieback project, Macquarie Island

Entry ID: ASAC_3095-Macca-soil-0910-Jared

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Summary

Abstract: This data contains the spatial information associated with the sites from which the soil samples were collected. It also contains the initial weights for each soil sample.

Soil samples were collected as part of the PhD thesis of Jared Abdul-Rahman, Spatiotemporal characteristics and causes of damage to Azorella macquariensis cushions.

Azorella macquariensis is a perennial cushion-forming herb ... that is endemic to Macquarie Island. During the 2008/09 austral summer, widespread dieback in A. macquariensis was observed, and is regarded by many to be a new phenomenon. The dieback is perceived to have spread across the entire island, affecting up to ~0 % of cushions in some areas. As a result of this perception the species has been listed as critically endangered under the Environment Protection and Biodiversity Conservation (EPBC) Act 1999.

Although there have been speculations about potential contributing factors, a definite cause has not been determined. The spatiotemporal characteristics of three dominant damage types affecting the cushion plant were investigated to help determine the cause/s of the putative increasing damage. In the austral summer of 2009/10, data were collected in the course of four studies: a cushion profile study; mapping of the spatial variation of cushion health; monitoring of temporal variation in cushion health; and a study relating soils to health. There was no significant relationship between overall cushion health and environmental variables apart from health decreasing with increasing exposure to strong winds. Type 1 damage was found to be more concentrated on the windward sectors of cushions, was significantly related to cushion exposure, substrate and vegetation community and did not display any major temporal variability. Type 2 damage was found to be more concentrated on the leeward sectors of cushions, was significantly related to cushion exposure, substrate and vegetation community and also did not display any major temporal variability. Type 3 damage was not significantly related to any particular sectors of cushions, nor to the environmental variables with the exception of cushion substrate, and expanded rapidly during the warm season. This suggested that the spatially restricted Type 3 damage might be responsible for the perception of increased dieback. Its cause is uncertain, although many of the symptoms are similar to those of a pathogen. Future monitoring should concentrate on this type of damage.

Related URL

Link: GET DATA

Description: Download point for the data

Geographic Coverage

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Spatial coordinates

N: -54.62

S: -54.62

E: 158.86

W: 158.86

Parent DIF

This data set description is a member of a collection. The collection is described in
ASAC_3095

Temporal Coverage

Start Date: 2008-10-01

Stop Date: 2009-03-31

Location Keywords

OCEAN > SOUTHERN OCEAN > MACQUARIE ISLAND

OCEAN > SOUTHERN OCEAN

GEOGRAPHIC REGION > POLAR

Science Keywords

LAND SURFACE > SOILS

BIOLOGICAL CLASSIFICATION > PLANTS > ANGIOSPERMS (FLOWERING PLANTS) > DICOTS
BIOSPHERE > VEGETATION > VEGETATION COVER

ISO Topic Category

BIOTA

ENVIRONMENT

Platform

FIELD INVESTIGATION

FIELD SURVEYS

Quality See the documentation in the download file for more information.

Access Constraints These data are publicly available for download from the provided URL.

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=ASAC_309... when using these data.

Data Set Progress

COMPLETE

Originating Center

Australian Antarctic Division

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

Distribution

Distribution Media: HTTP

Distribution Size: 13.5 MB

Distribution Format: Excel, pdf

Fees: Free

Personnel

DANA BERGSTROM

Role: INVESTIGATOR

Role: TECHNICAL CONTACT

Phone: +61 3 6232 3209

Fax: +61 3 6232 3351

Email: dana.bergstrom at aad.gov.au

Contact Address:

Australian Antarctic Division

203 Channel Highway

City: Kingston

Province or State: Tasmania

Postal Code: 7050

Country: Australia

DAVE CONNELL

Role: DIF AUTHOR

Phone: +61 3 6232 3244

Fax: +61 3 6232 3351

Email: dave.connell at aad.gov.au

Contact Address:

Australian Antarctic Division

203 Channel Highway

City: Kingston

Province or State: Tasmania

Postal Code: 7050

Country: Australia

Extended Metadata Properties

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Creation and Review Dates

DIF Creation Date: 2013-02-22

Last DIF Revision Date: 2013-02-22

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