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Development of an integrated long-term mangrove monitoring program for Darwin Harbour. Sub-project A: Mangrove community mapping: Charles Point to Gunn Point 2016



Development of an integrated long-term mangrove monitoring program for Darwin Harbour. Sub-project A: Mangrove community mapping: Charles Point to Gunn Point 2016

Other title

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


Hill, J.V.


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.

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Made available via the Publications (Legal Deposit) Act 2004 (NT)

Table of contents

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

Publisher name

Northern Territory Government

Place of publication



DENR Technical Report 19/2018


x 77 pages; colour illustrations and maps; x 30 cm

File type





Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government



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Mangrove Monitoring Project: Sub-project A 58 Hinterland Communities As the name implies these communities are found on the landward fringes of the mangroves and abut with the Eucalyptus forests. In some instances there is a saline reedland/Xerochloa spp. grassland between the mangroves and the dryland communities. Map Unit 7a Mixed species low woodland/samphire For this map unit, Lumnitzera racemosa, Excoecaria ovalis and Ceriops tagal may be dominant, co-dominant or locally dominant. Avicennia marina is also common. Trees are generally scattered, small and mallee in form, while some thickets occur. Shrubs, including Osbornia octodonta and Scyphiphora hydrophylacea, are found nearest the land. This unit includes low open-forest to low open-woodland, bare areas and areas of samphire. Samphire species include Halosarcia indica, Halosarcia halocnemoides and Tecticornia australasica. Xerochloa imberbis grasslands occur throughout the unit. Freshwater ponding areas may contain species such as Fimbristylis cymosa, Fimbristylis polytrichoides and Fimbristylis rara. Geomorphic Unit: Hinterland/Tidal flat margin Tidal Level: Supra-tidal, Mean High Water Springs+ Area: 122 ha (0.4%) Distribution and Habitat Notes: This map unit generally occurs on the upper tidal reaches and edges of saline flats. It varies from low open-woodland to low open-forest. It is similar in habit and species composition to the hinterland unit (map unit 4b), although it generally occurs on salt flats and/or rocky, gravelly substrates. Trees are generally lower and more widely dispersed where large areas of salt flat or samphire may occur. It appears to be found where the landward margins are broad and only slightly inclined, indicating perhaps less freshwater seepage and higher soil salinities. Soils are sandy muds, muddy sands or gravels. Slopes are gently inclined (1-2). Associated Vegetation Types: This unit is similar floristically to the hinterland margin unit (map unit 4b). Elements of this unit may occur on the tidal flat/mudflat regions (map units 9a-9b and 11). Description taken from Darwin Harbour survey.