The five species of seagrass occuring around the coast of Tasmania were located on a presence-absence basis. Sampling included the recording of species, depth, density, substratum and presence of algal epiphytes. Available aerial photography from three time periods (circa 1950, circa 1970 and circa 1990) was used to digitally map selected beds into a GIS using ARC/INFO. Sample site attributes were added to the database and patterns of change and distribution were analysed and mapped. An area of approx. 220 square kilometres was mapped leading to an estimate of between 400 and 500 square kilometres of seagrass occurring in Tasmania. Decline has occurred, particularly close to areas of human population and activity. The report proposes mechanisms for the management and protection of Tasmania's seagrass communities, and nominates representative areas for possible reserve status. Reference: Rees, CG 1994 Tasmanian Seagrass Communities, Masters Thesis, Centre for Environmental Studies, Department of Geography and Environmental Studies, University of Tasmania. Department of Geography and Environmental Studies, University of Tasmania.

The five species of seagrass occuring around the coast of Tasmania were located on a presence-absence basis. Sampling included the recording of species, depth, density, substratum and presence of algal epiphytes. Available aerial photography from three time periods (circa 1950, circa 1970 and circa 1990) was used to digitally map selected beds into a GIS using ARC/INFO. Sample site attributes were added to the database and patterns of change and distribution were analysed and mapped. An area of approx. 220 square kilometres was mapped leading to an estimate of between 400 and 500 square kilometres of seagrass occurring in Tasmania. Decline has occurred, particularly close to areas of human population and activity. The report proposes mechanisms for the management and protection of Tasmania's seagrass communities, and nominates representative areas for possible reserve status. Reference: Rees, CG 1994 Tasmanian Seagrass Communities, Masters Thesis, Centre for Environmental Studies, Department of Geography and Environmental Studies, University of Tasmania. Department of Geography and Environmental Studies, University of Tasmania.

This dataset is a composition of various datasets to form a map at the 1:100000 scale of the seagrass and underwater habitats from Shark Bay to NSW border going south and including Tasmania. Data extends up to 50Km offshore. The dataset was compiled largely by Dr Hugh Kirkman and subsequently updated by Dr. Ian Hahmdorf, (Bureau of Rural Sciences) and became part of CAMRIS as the CAMRIS Seagrass Dataset. Additional details (including a link to download the data as shapefile) are accessible via the www.environment.gov.au website (see links section).

Pattern of seagrass distribution in the Great Barrier Reef World Heritage Area Seagrasses in waters deeper than 15m in the Great Barrier Reef World Heritage Area adjacent to the Queensland coast were surveyed using a camera and dredge towed for 4-6 minutes at 1,429 sites spanning from 10ºS to 25ºS and from inshore out to the reef edge up to 120nm from the coast. At each site seagrass presence, species and biomass were recorded together with depth, sediment, sechii, algae and epibenthos, and proximity to reefs. Seagrasses in this region extend down to 60 m water depths and are difficult to map other than by generating distributions from point source data. Statistical modelling of the seagrass distribution suggests 40,000 km^2 of the bottom has a probability of some seagrass being present. There is strong spatial variability driven in part by the constraint of the Great Barrier Reef’s long, thin shape and physical processes associated with the land and ocean. We map the four main species, Halophila ovalis, H. spinulosa, H. decipiens, and H. tricostata. Distributions of H. ovalis and H. spinulosa show strong depth and sediment effects, whereas H. decipiens, and H. tricostata are only weakly correlated with environmental variables but show strong spatial patterns. Distributions of all species are correlated most closely with depth and the proportion of medium sized sediment. As part of the Reef Atlas project (now the eAtlas) the seagrass observations were interpolated over the whole GBR by Glenn De'ath using Generalized Additive Models with a Quasibinomial fit. This produced a gridded version of the dataset and is available as a KML and ASCII grid file. Data Units: Probability of occurrence (0 to 1).

This seagrass habitat map was produced by the ACEAS Seagrass working group as part of the seagrass habitat risk modelling effort. The map identified seagrass presence based on 1) on the NISB (National Intertidal-Subtidal Benthic) Habitat Map created by the University of Tasmania for a partnership between the Department of Climate Change and the National Land and Water Resources Audit, 2) UNEP WCMC Seagrass map 2005, 3) publications/reports.

This seagrass habitat map was produced by the ACEAS Seagrass working group as part of the seagrass habitat risk modelling effort. The map identified seagrass presence based on 1) on the NISB (National Intertidal-Subtidal Benthic) Habitat Map created by the University of Tasmania for a partnership between the Department of Climate Change and the National Land and Water Resources Audit, 2) UNEP WCMC Seagrass map 2005, 3) publications/reports and 4) expert knowledge/personal observation. This nationally aggregated seagrass presence/absence habitat map was produced from individual state-based habitat maps (see child records) for the purpose of publication to the AODN Data Portal.

This seagrass habitat map was produced by the ACEAS Seagrass working group as part of the seagrass habitat risk modelling effort. The map identified seagrass presence based on 1) on the NISB (National Intertidal-Subtidal Benthic) Habitat Map created by the University of Tasmania for a partnership between the Department of Climate Change and the National Land and Water Resources Audit, 2) UNEP WCMC Seagrass map 2005.

Data was collected on the distribution and biogeography of seagrass species on the northwest coast of Australia in the late 1980's.