Recent Change in the Extent of Mangroves in the Northern Gulf of Papua, Papua New Guinea

Shearman, Philip

doi:10.1007/s13280-010-0025-4

Cited by 28 publications

(23 citation statements)

References 29 publications

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“…In some locations, the dynamics of the mangrove fringe appear to be related to the 18.6-year cycle of highest tides (Gratiot et al 2008). Similarly rapid mudbank accretion and mangrove colonization occur in the sediment-rich Gulf of Papua, with vertical accumulation rates of several centimeters per year prior to mangrove establishment (Walsh & Nittrouer 2004, Shearman 2010. In these cases, mangrove ecological accommodation is controlled by dynamic topographic changes following mud redistribution.…”

Section: Wwwannualreviewsorg • Mangrove Sedimentation and Sea Levelmentioning

confidence: 99%

Mangrove Sedimentation and Response to Relative Sea-Level Rise

Woodroffe

Rogers

McKee

et al. 2016

Annu. Rev. Mar. Sci.

399

285

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Mangroves occur on upper intertidal shorelines in the tropics and subtropics. Complex hydrodynamic and salinity conditions, related primarily to elevation and hydroperiod, influence mangrove distributions; this review considers how these distributions change over time. Accumulation rates of allochthonous and autochthonous sediment, both inorganic and organic, vary between and within different settings. Abundant terrigenous sediment can form dynamic mudbanks, and tides redistribute sediment, contrasting with mangrove peat in sediment-starved carbonate settings. Sediments underlying mangroves sequester carbon but also contain paleoenvironmental records of adjustments to past sea-level changes. Radiometric dating indicates long-term sedimentation, whereas measurements made using surface elevation tables and marker horizons provide shorter perspectives, indicating shallow subsurface processes of root growth and substrate autocompaction. Many tropical deltas also experience deep subsidence, which augments relative sea-level rise. The persistence of mangroves implies an ability to cope with moderately high rates of relative sea-level rise. However, many human pressures threaten mangroves, resulting in a continuing decline in their extent throughout the tropics.

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Section: Wwwannualreviewsorg • Mangrove Sedimentation and Sea Levelmentioning

confidence: 99%

Mangrove Sedimentation and Response to Relative Sea-Level Rise

Woodroffe

Rogers

McKee

et al. 2016

Annu. Rev. Mar. Sci.

399

285

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show abstract

“…Spatial change analysis showing mangrove seaward retreat has been attributed to local relative sea-level rise (Gilman et al 2007;Shearman 2010), or human impacts (Tran Thi et al 2014), hence it can be utilised as an indicator of mangrove area sensitivity.…”

Section: Sediment Inputs Ground Water Salinity Photosynthesismentioning

confidence: 99%

Vulnerability assessment of mangroves to climate change and sea-level rise impacts

Ellison

2014

Wetlands Ecol Manage

194

117

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Climate change, particularly its associated sea level rise, is major threat to mangrove coastal areas, and it is essential to develop ways to reduce vulnerability through strategic management planning. Vulnerability has three dimensions of exposure to stresses, associated sensitivity, and related adaptive capacity, and ways to measure components of each were trialled at sites in Africa and the South Pacific to develop an analysis procedure based on ranking. The approaches of the ranking system for vulnerability assessment of mangrove systems integrate biotic and abiotic factors along with human management components, using validated methods previously developed for other research questions. These include determining mangrove forest health, adjacent ecosystem resilience, the extent and effects of human impacts, and the environmental conditions of different mangrove settings. Results of the vulnerability assessment ranking using up to 20 measurements found all sites to have some components of vulnerability. Douala Estuary, Cameroon showed the highest vulnerability, owing to low tidal range, impacts from nonclimate stressors, and evidence of moderate seaward edge retreat. Tikina Wai, Fiji showed inherent vulnerability owing to location on a subsiding coastline with a low tidal range, but this was offset by strong local community management capacity. Rufiji Delta, Tanzania showed inherent resilience owing to location on an uplifting coastline with a macrotidal range, but showed vulnerability from human impacts and lower local community management capacity. The most critical components to the vulnerability assessment were found to be exposure components of relative sea level trends and sediment supply, and sensitivity components of forest health, recent spatial changes and net accretion rates. The results provide a baseline against which to establish long-term ongoing monitoring, allowing continued assessment of the complex dynamics of climate change impacts, and providing an information base for strategic management decisions.

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“…For the Ganges-Brahamaputra system, their analysis indicated that total wetland conversion to open water and agriculture was 4920 km 2 from 1981 to 2001. Shearman (2010) documented the retreat of mangrove lobes in the Kikori River region of Papua New Guinea with concomitant progradation at the Purari River mouth over the period from 1972 to 2008. However, a mixture of accretion and erosion areas have been noted in the Kikori-Purari delta system (Shearman, 2010;Walsh and Nittrouer, 2004).…”

Section: Previous Studies Of Delta and Mangrove Changesmentioning

confidence: 99%