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 51 126.96.36.199 Avicennia marina Dominated Communities Map Unit 5a Avicennia marina low open-forest Avicennia marina dominates this community with heights ranging 5-9 m. Other species recorded in this community include Ceriops tagal, Excoecaria ovalis and Lumnitzera racemosa in the upper stratum and Aegialitis annulata in the mid stratum. Geomorphic Unit: High Tidal Flat Tidal Level: Mean High Water Neap to Mean High Water Spring Area: 310 ha (0.9%) Species Richness: 5 Table 20. Map unit 5a structural formation and stand information Strata Life Form Median Cover (%cc) Median PFC (%) Median Canopy Height (m) Upper tree 70 (65 - 80) 52 (46 - 52) 5 (5 - 9) Mid tree 2 (1 - 8) 2.5 (1.5 - 4) Lower tree 5 (3 - 15) 0.3 (0.1 - 0.3) Median Stand Basal Area (m2) Top Height (m) Average Stocking (stems/ha) Mean Stand Diameter (cm DBHOB) Average Partial Biomass (tonnes/ha) 25.3 9 (Avicennia marina) 3,693 11.83 4.3 Distribution and Habitat Notes: This map unit occurs on the high tidal flat, particularly in areas subject to freshwater influence. Median height for trees growing in this community is 5 m, which is generally taller than Avicennia marina trees in map units 5b and 5c. Leaf litter fall was estimated to comprise 4070% of ground cover in 20 x 20 m plots, which may be attributed to the low frequency of tidal inundation, litter being trapped amongst pneumatophores or the unpalatability of Avicennia marina leaves to fauna. The substrate is root structured and soils are predominantly sand with mud, tending to dry out during neap tidal cycles. The ground is nearly level, having a median slope of 1. Associated Vegetation Types: Small un-mappable areas of this community would be common in other hinterland communities. This map unit is equivalent to map unit 5 in the original Darwin Harbour survey.