Development of an integrated long-term mangrove monitoring program for Darwin Harbour. Sub-project A: Mangrove community mapping: Charles Point to Gunn Point 2016
Sub-project A: Mangrove community mapping: Charles Point to Gunn Point 2016
Brocklehurst, P; Edmeades, B; Northern Territory. Department of Environment and Natural Resources. Rangelands Division
E-Publications; E-Books; PublicationNT; DENR Technical Report 19/2018
Darwin Harbour; Shoal Bay
This report describes the updated mangrove communities for the approximately 32,000 ha of mangroves and salt flats that line the foreshores of Darwin Harbour, Shoal Bay and areas south of Charles Point and Gunn Point. Results indicate that there has not been any significant, discernible or substantive changes in mangrove forest composition in Darwin Harbour between 1996 and 2016.
Made available via the Publications (Legal Deposit) Act 2004 (NT)
1. Introduction; 2. Objectives; 3. Methods; 4. Results and discussion; 5. Conclusion; 6. Recommendations; 7. Bibliography; 8. Appendix.
Mangroves; Mangrove community mapping; Map unit; Vegetation mapping
Northern Territory Government
DENR Technical Report 19/2018
x 77 pages; colour illustrations and maps; x 30 cm
Attribution International 4.0 (CC BY 4.0)
Northern Territory Government
Mangrove Monitoring Project: Sub-project A 26 The new high resolution aerial photography used in 2016 allowed for better and finer recognition and depiction of mangrove communities as well as much higher spatial accuracy of the mapping. The new line work was produced by on screen digitising and visual appraisal of the high resolution digital photography on an ortho-rectified mosaic of the whole IMMRP monitoring area. Therefore it is difficult to determine the real change that has occurred since 1996 from changes identified due to finer definition of the mangrove communities. 4.2.6 Foliage cover change An example of a 30 year time series analysis (Figure 20) from the Landsat fractional cover product Band 2 photosynthetic vegetation (PV) for areas outlined in Charles Darwin National Park (Figure 19) is provided. Note that while the PV fraction (Band 2) is referred to as photosynthetic vegetation, it is measuring the green fraction of vegetation not photosynthesis. The increased variability early in the time series in some of the plots possibly indicates recovery from Cyclone Tracy. From 1995 to 2016, there appears to be no significant change in fractional cover (FPC), nor any obvious trends (i.e. no significant upward or downward trends) in this region. Charles Darwin National Park was an area in the Harbour most impacted by Cyclone Tracy so it appears that the mangroves had recovered fairly well by 1996 (21 years after cyclone Tracy) when the first mapping was undertaken. Figure 18 also shows the seasonality, darker green indicating the highest foliage cover in April and the lowest foliage cover in September.