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Data from the Macquarie Island non-native plant survey was consolidated into 1km grid squares. Data are provided on the presence and abundance of Stellaria media, Cerastium fontanum, Poa annua on both the contemporary 1km grid, and the historical Tasmanian Parks and Wildlife Service grid.
In 2010-11 a whole island survey or Macquarie Island was undertaken by Justine Shaw and Aleks Terauds. Quadrats (1m * 1m and 10m *10m) formed the basis of these surveys. At a minimum, quadrats were surveyed at the centroid of each 1 km * 1 km grid square. Other quadrats were surveyed along the survey track depending on the presence of non-native plants. Native plant coverage was also recorded in most quadrats. The download file contains an Excel spreadsheet. The spreadsheet contains three worksheets, two of which contain keys to the third worksheet (the data worksheet). Information from the two keys is summarised below: Key to Field Headings Island was divided into 1 km x 1 km cells (see associated shapefile). A ‘track’ of minimum length 750 m (and usually between 1-2 km) was walked through each cell from 1 km centroid to 1 km centroid (again with 1 m2 and 10 m2 quadrats). At a minimum, the centroid of each cell was surveyed for alien plants using a 1 m2 and 10 m 2 quadrat. Other quadrat based surveys were carried out along the track (again with 1 m2 and 10 m2 quadrats) when alien plants were detected. In most cases native plant coverage was also noted in each quadrat. Percentage cover was calculated for Poa annua, Cerastium fontanum, and Stellaria media. Number of plants was also documented for Cerastium fontanum and Stellaria media, not Poa annua as individual plants can’t be easily identified. The presence or absence of alien species was recorded along each track. For analytical purposes, each track was divided into 10 m segments, and the presence or absence of alien plants in these was then used to calculate the ‘proportion’ of each plant in each 1 km cell. For example, a 1km track through a cell has 100 ten metre segments, if 40 of these had Poa annua present, then the cell was allocated a proportional value of 40% for Poa annua (see shapefiles for actual data and visual representation). ID Cell ID LongitudeI Centroid of 1km cell longitude LatitudeI Centroid of 1km cell latitude C_poa 1x1 m quadrat percentage cover of Poa annua - note no number of plants for Poa annua because separate plants can't be identified C_cfA 1x1 m quadrat percentage cover of Ceastium fontanum C_cfN 1x1 m number of Cerastium fontanum plants in quadrat C_smA 1x1 m quadrat percentage cover of Stellaria media C_smN 1x1 m number of Stellaria media plants Q_poa 10 x10 m quadrat percentage cover n of Poa annua -- note no number of plants for Poa annua because separate plants can't be identified Q_cfA 10 x10 m quadrat percentage cover of Ceastium fontanum Q_cfN 10 x10 m number of Cerastium fontanum plants in quadrat Q_smA 10 x10 m quadrat percentage cover of Stellaria media Q_smN 10 x10 m number of Stellaria media plants Q_veg native veg composition - see attached worksheet for key Q_rab rabbit grazing present? (centroid only) Q_die Azorell dieback present? (centroid only) Vegetation key, numbers are percentage cover, will generally add up to 100 az Azorella macquariensis fm feldmark bare no veg hb herbfield - Megaherbs - mainly Pleurophyllum sc complex of short grass, typically Agrostis, Luzula, Festuca, co Colobanthus spp. (also sometimes colo) by bryophytres mr mire pa poa annua sg short grassland sh short herbs, Acaena spp, Cardamine sp., Montia sp. sgh short grass herb complex ttg tall tussock grass, typical Poa foliosa DR damaged by rabbits
Distribution data for Stellaria media on Macquarie Island. There are 8 files on distribution data for Stellaria media on Macquarie Island. The first 3 files provide the way points of all located Stellaria media plants on Macquarie Island as well as the sizes of a subsample of these plants. The density and distribution of these plants is mapped in file 4. In file 5 more detailed measurements are given from certain of those subsampled sites with regards to plant width, depth, height, age, dominant phenology, and dominance with regards to other vegetation. The final 2 files are summary tables of environmental and vegetation (including Stellaria) characteristics from each of the 8 major population sites at which Stellaria is found on the island. More detailed methods are given in each of the files. Distribution, % cover and size of S. media will be mapped across MI along with environmental and dispersal factors. Detailed vegetation surveys conducted at 6 infested sites over 3 seasons to determine directional changes in vegetation community structure. The AA_NVA excel file records the locations from which samples of seeds and plants were collected from a variety of introduced and native species for use in other trials back in Australia.
Seedling emergence data for Stellaria media on Macquarie Island. There are 4 files on seedling emergence data for Stellaria media on Macquarie Island. The first 3 files are plot maps showing the locations of the seedling emergence plots at Finch Creek, Gadgets Gully and Island Lake. The last data file includes percentage vegetation cover in 15 plots per site prior to the experiment and then seedling emergence counts 1 and 2 months after 3 treatments were imposed, being either intact vegetation, half the vegetation cleared and all the vegetation cleared. More detailed methods are given in the latter file. In-situ emergence monitored in 10 cleared plots (0.5x0.5m) at each of 3 sites over summer. Ex-situ experiments with and without native plant competition and simulated grazing conducted to identify key processes in the success or otherwise of S. media post herbivore eradication. Live plants (and seeds for backup) brought back to UNE from MI. Bulked soil (for use here and at 6) to a depth of 100 mm, collected from MI as in previous project work.
Injury data for Stellaria media and native plant species collected from Macquarie Island when treated with herbicides at different times and with different rates grown in a plant growth cool room. There are 4 files on injury data for Stellaria media and native plant species collected from Macquarie Island when treated with herbicides at different times and with different rates grown in pots in a plant growth cool room at the University of New England. The first file provides injury data for the first experiment recorded on a scale from 1-10 (from least to most injury) for 7 herbicides and a water control for post-emergence application on Stellaria media alone when herbicides were applied at their recommended rates. The second file provides seedling emergence, leaf number and dry weight of Stellaria media plants in pots for herbicides applied pre-emergence in a second experiment at either the recommended rate or half the recommended rate. The third file provides injury data for three weeds and several native species in a third experiment when herbicides were applied post-emergence at 0.25, 0.5 and 1 x the recommended rate to determine selectivity of herbicides between Stellaria media and the other weeds on the island and several of the more common and co-occurring native species. The last file contains graphs and statistical analyses of the results for the above 3 experiments. More detailed methods are provided in the Master of Science in Agriculture thesis of Waqas Zahid (University of New England, 2018). Initial screening of herbicides on S. media, the closely related alien, C. fontanum, and several native species in pots under sub-Antarctic conditions in the dedicated UNE facility using live plants collected from MI. While herbicides may be used in various situations in the Arctic and sub-Antarctic, MI managers have preferred us to trial herbicides off island, and use the research outcomes to direct herbicide application decisions. The data will be comprised of plant growth measurements for the weed and a variety of native species and herbicide symptom assessments.
Longevity, development and flowering data for Stellaria media plants on Macquarie Island. There are 5 spreadsheets here on the longevity, development and flowering of Stellaria media plants on Macquarie Island. In building a picture of infestations of Stellaria media the first spreadsheet provides density and percent cover of Stellaria media in the densest areas of the weed at 4 sites. The second spreadsheet provides data on the survival of tagged plants over 2 years. The third spreadsheet shows how many seeds are produced by Stellaria media plants of different sizes and whether those plants were growing above or below (ie their dominance towards) other vegetation. The next spreadsheet shows data on 20 plants that were temporarily tagged at several sites and monitored for several months to assess changes in reproductive capacity (buds, flowers, seed pods) over time. In the final spreadsheet we provide data on the development over a one week period of individual flowers. More detailed methods are given in each of the files. 20 plants tagged at each of 3 sites (GPS referenced) for long term monitoring, with seedlings also monitored during the summer for their development, size (height and diameter) and time to flowering.
Data on the regrowth and emergence of Stellaria media following the application of several physical weed control methods on Macquarie Island. There is one spreadsheet of data on the regrowth and emergence of Stellaria media in small plots following the application of several physical weed control methods for the weed on Macquarie Island including hand weeding, trimming, and scalping as well as an undisturbed control. The experiment was undertaken at 4 sites, Bauer Bay, Brother’s Point, Island Lake and Tractor Rock and included a second hand weeding for some treatments. Percentage cover of the weed and other species were recorded in each of the plots. More detailed methods are given in the file. In-situ experiments involving treatments (1x1m plots) such as hand weeding, digging, cutting plants at ground level and scalping established at 6 infested sites to assess remediation effectiveness in subsequent seasons.
Soil seedbank data for Stellaria media on Macquarie Island. There are 6 files of soil seedbank data for Stellaria media on Macquarie Island. The first 4 files provide the data and methods on the seed burial experiment both in textural and pictorial form whereby seed was buried in nylon mesh bags at 2 depths across 6 sites and then exhumed twice after 1 and 2 years to determine the longevity and viability of buried seed. The 6th file shows the statistical analysis for these results and provides graphs of the data developed in the statistical software package R. File 5 includes seedbank data collected from beneath 6 plants at each of 4 sites whereby soil cores were taken from beneath the plants and then also two distances away (15 and 60 cm) and the seeds counted at various depths. In this way, seed dispersal was measured. More detailed methods are given in each of the files. Seedbank of S. media sampled using 20 random (GPS referenced) 100 mm depth intact cores (60 mm diameter) at 6 infested sites, then transferred in plastic bags to UNE to be characterised. Freshly harvested seeds buried in nylon bags at 6 sites for monitoring of persistence (germinability, viability and dormancy) in later seasons.
The data are location and abundance data of alien plants found during a systematic survey of Macquarie Island. It relates to three species Poa annua, Cerastium fontanum and Stellaria media. It is essentially a repeat of the Copson 1977 survey. This work has been completed as part of ASAC (AAS) project 2904, "Aliens in Antarctica" (ASAC_2904).