Kangaroo Island Glossy Black-Cockatoo Foraged Sheoak Data, 2023 – 2024
This study aimed to investigate whether the reduction in food supply following the Kangaroo Island 2019 – 20 Black Summer fires would result in Glossy Black Cockatoos foraging less selectively on <em>Allocasuarina verticillata</em> (drooping Sheoak) food trees within those patches, i.e. at higher foraging rates. We investigated whether foraging intensity (i.e., the proportion of foraged trees relative to total number of examined female trees) in regions on Kangaroo Island impacted by the fires differed from that in unburnt areas, and whether that had resulted in GBCs feeding on cones with lower food profitability in burnt regions. <br></br>
Simple
Identification info
- Date (Creation)
- 2023-03-30
- Date (Publication)
- 2025-12-15
- Date (Revision)
- 2025-12-15
- Edition
- 1.0
Identifier
Publisher
Author
Charles Darwin University - Mooney, Patricia Anne (PhD Candidate)
Ellengowan Drive, Casuarina, Northern Territory, 0810, Australia
Casuarina
Northern Territory
0810
Australia
- Website
- https://www.tern.org.au/
- Credit
- We at TERN acknowledge the Traditional Owners and Custodians throughout Australia, New Zealand and all nations. We honour their profound connections to land, water, biodiversity and culture and pay our respects to their Elders past, present and emerging.
- Status
- Completed
Point of contact
Charles Darwin University - Mooney, Patricia Anne (PhD Candidate)
Ellengowan Drive, Casuarina, Northern Territory, 0810, Australia
Ellengowan Drive
Casuarina
Northern Territory
0810
Australia
- Topic category
-
- Environment
Extent
- Description
- Kangaroo Island
N
S
E
W
))
Temporal extent
- Time period
- 2023-03-30 2024-05-20
- Maintenance and update frequency
- Not planned
- GCMD Science Keywords
- ANZSRC Fields of Research
- TERN Parameter Vocabulary
- QUDT Units of Measure
- GCMD Horizontal Resolution Ranges
- GCMD Temporal Resolution Ranges
- Australian Faunal Directory
Resource specific usage
- Specific usage
- Location coordinates for Glossy Black-Cockatoo observations have been intentionally masked in the published data files in accordance with the South Australian Department for Environment and Water’s policies for managing sensitive and threatened species information. Precise locations are not publicly released to protect the species and its habitat. Researchers requiring access to detailed location data should contact the data providers directly to discuss access options and appropriate data-sharing arrangements.
Resource constraints
- Use limitation
- The Creative Commons Attribution 4.0 International (CC BY 4.0) license allows others to copy, distribute, display, and create derivative works provided that they credit the original source and any other nominated parties. Details are provided at https://creativecommons.org/licenses/by/4.0/
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- png
- Title
- Creative Commons Attribution 4.0 International Licence
- Alternate title
- CC-BY
- Edition
- 4.0
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- Use constraints
- Other restrictions
- Other constraints
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- Other constraints
- Please cite this dataset as {Author} ({PublicationYear}). {Title}. {Version, as appropriate}. Terrestrial Ecosystem Research Network. Dataset. {Identifier}.
Resource constraints
- Classification
- Unclassified
Distribution Information
- Distribution format
-
- NetCDF
Distributor
Distributor
- OnLine resource
- Clouts Index of Glossy Black-Cockatoo, Kangaroo Island 2024
Distribution Information
- Distribution format
-
- NetCDF
Distributor
Distributor
- OnLine resource
- Glossy Black-Cockatoo Foraging Rates, Kangaroo Island 2023-24
Distribution Information
- Distribution format
-
- NetCDF
Distributor
Distributor
- OnLine resource
- Clouts Index of Glossy Black-Cockatoo, Kangaroo Island 2023
Distribution Information
- Distribution format
-
- NetCDF
Distributor
Distributor
Distribution Information
- Distribution format
-
Distributor
Distributor
Terrestrial Ecosystem Research Network
Building 1019, 80 Meiers Rd, Indooroopilly, QLD, Australia, 4068
Indooroopilly
QLD
4068
Australia
- OnLine resource
- ro-crate-metadata.json
Resource lineage
- Statement
- <p><strong>Sampling methods</strong></p> <p>We estimated foraging intensity per patch at a total of 54 remnant and revegetated <em>A. verticillata</em> feeding habitat sites over three time periods in 2023-24, comparing sites in regions with greater than 50% and less than 50% fire affected habitat. We also collected cones from 391 foraged trees at 39 of these sites to determine Clout’s Index, a measure of food profitability, and modelled the results for a range of environmental variables. Sample site characteristics are summarised in Table 1(a) and 1(b).</p><br></br> <p><strong>Table 1(a). </strong>Sample sites, Foraging intensity: 54 sites in total, some sites repeat surveyed</p> <table> <tbody> <tr> <td width="113"> <p><strong>Time period</strong></p> </td> <td width="83"> <p><strong>Remnant sites</strong></p> </td> <td width="91"> <p><strong>Revegetation sites</strong></p> </td> <td width="157"> <p><strong>Ratio of sites in > 50% to <50% burnt regions</strong></p> </td> <td width="151"> <p><strong>Mean number and range of trees surveyed</strong></p> </td> </tr> <tr> <td width="113"> <p>2023 breeding season</p> </td> <td width="83"> <p>12</p> </td> <td width="91"> <p>12</p> </td> <td width="157"> <p>15:9</p> </td> <td width="151"> <p>61 (44-78)</p> </td> </tr> <tr> <td width="113"> <p>2023 post-breeding</p> </td> <td width="83"> <p>16</p> </td> <td width="91"> <p>10</p> </td> <td width="157"> <p>14:12</p> </td> <td width="151"> <p>43 (16-97)</p> </td> </tr> <tr> <td width="113"> <p>2024 breeding season</p> </td> <td width="83"> <p>14</p> </td> <td width="91"> <p>25</p> </td> <td width="157"> <p>24:15</p> </td> <td width="151"> <p>59 (23-99)</p> </td> </tr> </tbody> </table> <br></br> <p><strong>Table 1(b). </strong>Sample sites, Clout’s Index of foraged trees: 39 sites in total</p> <table> <tbody> <tr> <td width="113"> <p><strong>Year</strong></p> </td> <td width="83"> <p><strong>Remnant sites</strong></p> </td> <td width="91"> <p><strong>Revegetation sites</strong></p> </td> <td width="157"> <p><strong>Ratio of trees in > 50% to <50% burnt regions</strong></p> </td> <td width="151"> <p><strong>No. sampled trees (sites)</strong></p> </td> </tr> <tr> <td width="113"> <p>2023</p> </td> <td width="83"> <p>12</p> </td> <td width="91"> <p>12</p> </td> <td width="157"> <p>175:65</p> </td> <td width="151"> <p>240 (24 sites)</p> </td> </tr> <tr> <td width="113"> <p>2024</p> </td> <td width="83"> <p>2</p> </td> <td width="91"> <p>13</p> </td> <td width="157"> <p>91:49</p> </td> <td width="151"> <p>140 (15 sites)</p> </td> </tr> <tr> <td width="113"> <p>2023-24 combined</p> </td> <td width="83"> <p>14</p> </td> <td width="91"> <p>25</p> </td> <td width="157"> <p>266:114</p> </td> <td width="151"> <p>380 (39 sites)</p> </td> </tr> </tbody> </table> <br></br> <p>Foraging intensity surveys were carried out once during the 2023 and 2024 nesting seasons (February-June), and once in 2023 post-breeding period (September-November), when Glossy Black Cockatoos had grouped together in flock regions. Habitat searches were undertaken at the beginning of the study to locate foraging sites within known feeding habitat patches. Transect surveys were conducted within the habitat patches, both at sites where cones were being collected for Clout’s Index analysis and at additional sites where foraging sign had been observed. We aimed to maximise the area surveyed, with starting points located where feeding sign was first encountered in the habitat. Female trees were categorised as either ‘foraged’ if chewings were present under the tree or ‘not foraged’ if no chewings were present. Chewings weather and change colour with age, with three age groups recorded: up to a few weeks old (cream to bright orange, 32%), darker to faded orange (65%), indicating feeding within the last few months, and older pale brown chewings (3%). Foraging intensity for each site was calculated as the proportion of foraged trees relative to the total number of female trees in the transect.</p> <br></br> <p>Two slightly different methods were employed, both variations of walking transects (Pepper 1997). Both methods aimed to record the feeding status for a minimum of n=50 female trees, although this was not possible in some small revegetation sites. Dead trees or trees with less than 75% healthy foliage were not sampled. For surveys conducted during the 2023 Glossy Black Cockatoo breeding season, every live female tree encountered with more than 20 russet cones was noted and its feeding status recorded. In the subsequent two sampling periods, transects aimed to cover most or all of a habitat patch so that a representative sample could be obtained. These transects tended to be longer than those in the first period.</p><br></br> <p>At each Clout’s Index sample site, we aimed to locate a minimum of ten <em>A. verticillata </em>trees that were at least five metres apart and had evidence of recent foraging. We recorded tree height and estimated the number of russet cones available in two categories (<500 and >500). We collected 10 russet cones from each sample tree, aiming to sample at least three different parts of the tree. Fewer than 10 cones were collected from six trees due to lack of availability.</p> <p>The cones from each sample tree were placed in a labelled paper bag and stored on drying racks or in open baskets until dry (up to 3 months). Each year’s batch was fan dried in a bulk drying kiln for 44 hours at 60 degrees. Cones were warmed in a domestic oven prior to weighing, to assist in removing any moisture that may have accumulated since kiln drying and then allowed to equilibrate to room temperature for at least one hour. The cones and seeds were weighed separately to the nearest hundredth of a gram, using a digital balance. Clout’s index was obtained for each sample tree by dividing the seed weight by the seed-plus-cone weight, based on the method used by Clout (1989) and Crowley and Garnett (2001).</p>
- Hierarchy level
- Dataset
Reference System Information
- Reference system identifier
- EPSG/EPSG:3395
- Reference system type
- Geodetic Geographic 2D
Metadata
- Metadata identifier
-
urn:uuid/cb101a88-1c7b-4e2f-a4e3-6d9548a8438e
- Title
- TERN GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
Point of contact
Type of resource
- Resource scope
- Dataset
- Metadata linkage
-
https://geonetwork.tern.org.au/geonetwork/srv/eng/catalog.search#/metadata/cb101a88-1c7b-4e2f-a4e3-6d9548a8438e
Point-of-truth metadata URL
- Date info (Creation)
- 2025-10-20T02:28:49.261317+00:00
- Date info (Revision)
- 2025-12-15T22:31:28.263922+00:00
Metadata standard
- Title
- ISO 19115-1:2014/AMD 1:2018 Geographic information - Metadata - Fundamentals
- Edition
- 1
Metadata standard
- Title
- ISO/TS 19115-3:2016
- Edition
- 1.0
Metadata standard
- Title
- ISO/TS 19157-2:2016
- Edition
- 1.0
- Title
- Terrestrial Ecosystem Research Network (TERN) Metadata Profile of ISO 19115-3:2016 and ISO 19157-2:2016
- Date (published)
- 2021
- Edition
- 1.0
Identifier
Overviews
Spatial extent
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E
W
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Associated resources
Not available