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Effects of UV radiation on community establishment: a global perspective

Entry ID: ASAC_1233

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Summary

Abstract: Increased ultraviolet radiation (UV-A and/or UV-B) may impact on the establishment and structure of a shallow water benthic invertebrate assemblages. A global experiment in more than 8 countries, using an identical methodology (transparent UV filters) will add significantly to our understanding of the impacts of anthropogenically induced global change on natural systems.

To appraise the effects ... of increased UVR on shallow marine benthic assemblages, five experimental rafts were deployed in protected bays west of Shirley Island near Casey Station, Antarctica (66.16oS 110.30oE). Each raft consisted of eight experimental units, each of which contained a colonization panel (ceramic tile) positioned horizontally and submerged 4-6 cm underwater. Irradiation treatments were randomly assigned to each unit with the use of UV cut-off filters. The treatments were as follows: No UVR (transmits photosynthetically active radiation or PAR, 400-700nm), No UVB (transmits PAR + UVA, 320-700nm), Perspex (full spectrum, 280-700nm, procedural control), or No filter (full spectrum, treatment control). In addition there were three levels of consumer treatments: With consumption (container sides removed), without consumption (container sides perforated with 4 mm holes), and a control (3 sides perforated, 1 side removed). After seven weeks tiles were removed to the laboratory for examination. All tiles were dominated by diatoms and no sessile invertebrates were apparent.

The first trial has been completed, but several other panels are still in place. A conference will be held in early 2002 between participating countries to discuss results and findings.

The 2001\2002 summer season consisted of experimental designs divided up into three seperate projects.
The aims were all to provide a corrollary to the previous seasons data.
Project 1 consisted of the extraction and redeployment of settlement depth arrays situated in Geoffrey's Bay and Hollin Island Channel. Due to prevailing weather conditions resulting in limited boating hours and diving program, only one array was retrieved. On inspection of the array it was decided to deploy further replicates to gain a better temporal understanding of the communities.
Projects 2 and 3 consisited of a similar experimental design, however monitoring the shallower dpeths of settlement (depths of 1m and 2m below sea level) for a period of one month. Project 2 consisted of arrays with two depths and 2 panels per depth, triple replicated, under the icesheet in O'Brien Bay and Shirley Channel, with a substrate depth of 20m. Diatom samples are to be analyzed in Australia. Project 3 was of a similar design to project 2 though it was measuring recruitment in shallow open water. The two sites consisted of Noonan Cove and Geoffrey's Bay at substrate depths of 5m. These tiles are also to be analyzed on return to Australia.

There were 5 rafts used in this study - they are listed as R1 to R5 there were two factors in the design -(i) predator access: Caged (C) Half caged (H) and Open (O) and ii) UV exposure: Perpex (P), Macrolon (M), No filter (N) and Film + perspex (F).

A list of the diatoms found on the settlement panels is provided at the url below.

The fields in this dataset are:
Species
Sample

Related URL

Link: GET DATA

Description: Download page for Australian Antarctic Data Centre

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: -66.16

S: -66.16

E: 110.3

W: 110.3

Temporal Coverage

Start Date: 2001-01-05

Stop Date: 2001-02-22

Location Keywords

CONTINENT > ANTARCTICA > Casey

CONTINENT > ANTARCTICA > Shirley Island

Science Keywords

SPECTRAL/ENGINEERING > ULTRAVIOLET WAVELENGTHS > ULTRAVIOLET RADIANCE

BIOLOGICAL CLASSIFICATION > PLANTS > ALGAE

ISO Topic Category

BIOTA

IMAGERY/BASE MAPS/EARTH COVER

OCEANS

Access Constraints The dataset is available from the url given below.

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

Ancillary Keywords

ABUNDANCE

CASEY

Data Set Progress

IN WORK

Originating Center

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: 3 kb

Distribution Format: .csv

Fees: free

Personnel

ANDREW DAVIS

Role: TECHNICAL CONTACT

Role: DIF AUTHOR

Role: INVESTIGATOR

Phone: +61 2 4221 3432

Fax: +61 2 4221 4135

Email: a.davis at uow.edu.au

Contact Address:

University of Wollongong

Department of Biological Sciences

City: WOLLONGONG

Province or State: New South Wales

Postal Code: 2522

Country: Australia

DREW LEE

Role: TECHNICAL CONTACT

Contact Address:

DPIWE

City: Hobart

Province or State: Tasmania

Postal Code: 7000

Country: Australia

GLENN JAMES JOHNSTONE

Role: TECHNICAL CONTACT

Phone: +61 3 6232 3183

Email: glenn.johnstone at aad.gov.au

Contact Address:

Australian Antarctic Division

203 Channel Highway

City: Kingston

Province or State: Tasmania

Postal Code: 7050

Country: Australia

Creation and Review Dates

DIF Creation Date: 2000-08-11

Last DIF Revision Date: 2008-04-10

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