EasternFreshwaterCod

EasternFreshwaterCod
Eastern Freshwater Cod (Maccullochella ikei) are a large fish that areonly found in the Clarence and Richmond River catchments of northern NSW. They are an endangered species - The methods used to create the predicted current distribution of Eastern Freshwater Cod (Maccullochella ikei) are described fully in: NSW Department of Primary Industries (2015), NSW Fish Community Status 2015 – Final Report.The predicted current distribution of Eastern Freshwater Cod (Maccullochella ikei) in NSW. All available records of the species were collated and assessed for accuracy. For current distribution, only records after 1 January 1994 were used. Within the framework of the Australian Hydrological Geospatial Fabric V2 surface hydrology network, the records were associated with attributes from the National Environmental Stream Attributes Database and River Styles® geomorphology. Modelling the current geographic distribution of each listed threatened freshwater aquatic species or population was undertaken using MaxEnt 3.3.3; a widely used species distribution modelling program that utilises presence records to generate probabilities of occurrence based on a suite of environmental variables quantified across the area of interest.The Australian Hydrological Geospatial Fabric V2 surface hydrology network (Geofabric) is a fully connected and directed stream network based a 9 second DEM. It allocates a unique stream segment number to each river reach in Australia. The Environmental Attributes Database is a set of lookup tables supplying attributes describing the natural and anthropogenic characteristics of the stream and catchment environment that was developed by the Australian National University (ANU) in 2011 and updated in 2012. The data is supplied as part of the supplementary Geofabric products which is associated with the 9 second DEM derived streams and the National Catchment Boundaries based on 250k scale stream network. 30 Stream variables were assessed for the modelling.River Styles®provides a high resolution categorical classification of river character within a nested hierarchy of criteria based on valley setting, channel planform, geomorphic units, and bed material. The NSW Office of Water compiled a spatial dataset of River Styles®classifications for a large number of the waterways of NSW. From 65 River Style®categories we generated two new fields representing Planform (34 categories) and Substratum (8 categories) for each stream segment. River Style®planform and substratum categories were then assigned to each Geofabric segment.MaxEnt 3.3.3 is a widely used species distribution modelling program that utilises presence records to generate probabilities of occurrence based on a suite of environmental variables quantified across the area of interest. It was used to model the current geographic distribution of each listed threatened freshwater aquatic species or population. We utilised logistic output to plot the predicted distribution of each species. This output equates to a probability that the species will be observed in each river reach, given the environmental conditions that exist there relative to the environmental conditions where the species is known to occur. For this mapping, above 33% probability was considered predicted presence. Only stream segments with a modelled average daily flow of more than five megalitres were selected for output. In addition, predicted separate populations were connected by manual interpretation. The predicted values for each river reach were converted from the Geofabric framework to the higher resolution 2013 NSW Strahler Stream Order Hydroline.

Bobo River
OBJECTID_1 | 1
StreamName | Bobo River
Threatened | Eastern Freshwater Cod

Boonoo Boonoo River
OBJECTID_1 | 2
StreamName | Boonoo Boonoo River
Threatened | Eastern Freshwater Cod

Boundary Creek
OBJECTID_1 | 3
StreamName | Boundary Creek
Threatened | Eastern Freshwater Cod

Boyd River
StreamName | Boyd River

Clarence River
StreamName | Clarence River

Coombadjha Creek
StreamName | Coombadjha Creek

Coopers Creek
StreamName | Coopers Creek

Dandahra Creek
StreamName | Dandahra Creek

Gibbergunyah Creek
StreamName | Gibbergunyah Creek

Gradys Creek
StreamName | Gradys Creek

Guy Fawkes River
StreamName | Guy Fawkes River

Little Murray River
StreamName | Little Murray River

Little Nymboida River
StreamName | Little Nymboida River

Mann River
StreamName | Mann River

Maryland River
StreamName | Maryland River

Nymboida River
StreamName | Nymboida River

Orara River
StreamName | Orara River

Richmond River
StreamName | Richmond River

Rocky Creek
StreamName | Rocky Creek

Sara River
StreamName | Sara River

Stirrup Iron Creek
StreamName | Stirrup Iron Creek

Terania Creek
StreamName | Terania Creek

Timbarra River
StreamName | Timbarra River

Washpool Creek
StreamName | Washpool Creek

Wild Cattle Creek
StreamName | Wild Cattle Creek

Wilsons River
StreamName | Wilsons River