Natural and anthropogenic changes to mangrove distributions in the Pioneer River Estuary (QLD, Australia)

We analyzed a time series of aerial photographs and Landsat satellite imagery of the Pioneer River Estuary (near Mackay, Queensland, Australia) to document both natural and anthropogenic changes in the area of mangroves available to filter river runoff between 1948 and 2002. Over 54 years, there was a net loss of 137 ha (22%) of tidal mangroves during four successive periods that were characterized by different driving mechanisms: (1) little net change (1948–1962); (2) net gain from rapid mangrove expansion (1962–1972); (3) net loss from clearing and tidal isolation (1972–1991); and (4) net loss from a severe species-specific dieback affecting over 50% of remaining mangrove cover (1991–2002). Manual digitization of aerial photographs was accurate for mapping changes in the boundaries of mangrove distributions, but this technique underestimated the total loss due to dieback. Regions of mangrove dieback were identified and mapped more accurately and efficiently after applying the Normalized Difference Vegetation Index (NDVI) to Landsat Thematic Mapper satellite imagery, and then monitoring changes to the index over time. These remote sensing techniques to map and monitor mangrove changes are important for identifying habitat degradation, both spatially and temporally, in order to prioritize restoration for management of estuarine and adjacent marine ecosystems.

[1]  D. Imbert,et al.  Hurricane damage and forest structure in Guadeloupe, French West Indies , 1996, Journal of Tropical Ecology.

[2]  S. Sader,et al.  Detection of forest harvest type using multiple dates of Landsat TM imagery , 2002 .

[3]  P. Saenger,et al.  A classification of tropical and subtropical Australian estuaries , 1994 .

[4]  W. D. Genst,et al.  Four decade vegetation dynamics in Sri Lankan mangroves as detected from sequential aerial photography: a case study in Galle. , 2000 .

[5]  H. Mohd-Lokman,et al.  Mangrove Mapping Using Landsat Imagery and Aerial Photographs: Kemaman District, Terengganu, Malaysia , 2002 .

[6]  C. Proisy,et al.  Half a century of dynamic coastal change affecting mangrove shorelines of French Guiana. A case study based on remote sensing data analyses and field surveys , 2004 .

[7]  P. Mumby,et al.  Mangroves enhance the biomass of coral reef fish communities in the Caribbean , 2004, Nature.

[8]  A. C. Ellis,et al.  Estimating leaf area index of mangroves from satellite data , 1997 .

[9]  Y. Wong,et al.  Mangrove soils as sinks for wastewater-borne pollutants , 2004, Hydrobiologia.

[10]  F. Blasco,et al.  Mangrove research and coastal ecosystem studies with SPOT-4 HRVIR and TERRA ASTER in the Arabian Gulf , 2003 .

[11]  J. Gao,et al.  A comparative study on spatial and spectral resolutions of satellite data in mapping mangrove forests , 1999 .

[12]  C. Duarte,et al.  Retrospective estimates of net leaf production in Kandelia candel mangrove forests , 2001 .

[13]  D. Imbert,et al.  Ecology of Mangrove Growth and Recovery in the Lesser Antilles: State of Knowledge and Basis for Restoration Projects , 2000 .

[14]  F. Blasco,et al.  Mangroves along the coastal stretch of the Bay of Bengal: Present status , 2002 .

[15]  C. D. Field,et al.  World Mangrove Atlas , 1997 .

[16]  D. Alongi.  Present state and future of the world's mangrove forests , 2002, Environmental Conservation.

[17]  C. Roelfsema,et al.  Preliminary investigation into dieback of mangroves in the Mackay region , 2001 .

[18]  R. Lucas,et al.  Use of stereo aerial photography for quantifying changes in the extent and height of mangroves in tropical Australia , 2002, Wetlands Ecology and Management.

[19]  C. Proisy,et al.  On the influence of canopy structure on the radar backscattering of mangrove forests , 2002 .

[20]  J. R. Jensen,et al.  Remote Sensing of Mangrove Wetlands: Relating Canopy Spectra to Site-Specific Data , 1996 .

[21]  E. Wolanski,et al.  Sedimentation in Mangrove Forests , 1996 .

[22]  F. Dahdouh-Guebas.  The Use of Remote Sensing and GIS in the Sustainable Management of Tropical Coastal Ecosystems , 2002 .

[23]  A. Robertson,et al.  Tropical Mangrove Ecosystems , 1992 .

[24]  R. Lunetta,et al.  Remote Sensing Change Detection: Environmental Monitoring Methods and Applications , 1999 .

[25]  D. Alongi,et al.  The cycling and fate of terrestrially-derived sediments and nutrients in the coastal zone of the Great Barrier Reef shelf. , 2005, Marine pollution bulletin.

[26]  Changes in the distribution of mangroves and saltmarshes in Jervis Bay, Australia , 2001, Wetlands Ecology and Management.

[27]  L. Albright.  In situ degradation of mangrove tissues (note) , 1976 .

[28]  P. Tomlinson.  The botany of mangroves , 1987 .

[29]  F. James Rohlf,et al.  Biometry: The Principles and Practice of Statistics in Biological Research , 1969 .

[30]  Bronwyn Harch,et al.  A broad-scale analysis of links between coastal fisheries production and mangrove extent: A case-study for northeastern Australia , 2005 .

[31]  F. Blasco,et al.  Assessment from space of mangroves evolution in the Mekong Delta, in relation to extensive shrimp farming , 2004 .

[32]  A. C. Ellis,et al.  The assessment of mangrove areas using high resolution multispectral airborne imagery , 1998 .

[33]  F. Blasco,et al.  Depletion of the mangroves of Continental Asia , 2001, Wetlands Ecology and Management.

[34]  D. Haynes,et al.  Great Barrier Reef water quality : current issues , 2001 .

[35]  Britta Schaffelke,et al.  Water quality in the Great Barrier Reef region: responses of mangrove, seagrass and macroalgal communities. , 2005, Marine pollution bulletin.

[36]  P. Gong,et al.  Comparison of IKONOS and QuickBird images for mapping mangrove species on the Caribbean coast of Panama , 2004 .

[37]  D. Itenfisu,et al.  WITHIN FIELD VARIABILITY IN WHEAT GRAIN YIELDS OVER NINE YEARS IN OKLAHOMA , 2002 .

[38]  J. A. Schell,et al.  Monitoring vegetation systems in the great plains with ERTS , 1973 .

[39]  N. Duke,et al.  A systematic revision of the mangrove genus Avicennia (Avicenniaceae) in Australasia , 1991 .

[40]  J. Hacker.  Rapid accumulation of fluvially derived sands and gravels in a tropical macrotidal estuary: the Pioneer River at Mackay, North Queensland, Australia , 1988 .

[41]  J. R. Jensen.  Remote Sensing of the Environment: An Earth Resource Perspective , 2000 .

[42]  Russell G. Congalton,et al.  A review of assessing the accuracy of classifications of remotely sensed data , 1991 .

[43]  Christopher Justice,et al.  The impact of misregistration on change detection , 1992, IEEE Trans. Geosci. Remote. Sens..

[44]  N. Koedam,et al.  Human-impacted mangroves in Gazi (Kenya): predicting future vegetation based on retrospective remote sensing, social surveys, and tree distribution , 2004 .

[45]  P. Mumby,et al.  A review of remote sensing for the assessment and management of tropical coastal resources , 1996 .

[46]  P. Mumby,et al.  The cost-effectiveness of remote sensing for tropical coastal resources assessment and management , 1999 .

[47]  E. Wolanski.  Oceanographic processes of coral reefs: physical and biological links in the Great Barrier Reef , 2000 .

[48]  A. Held,et al.  High resolution mapping of tropical mangrove ecosystems using hyperspectral and radar remote sensing , 2003 .

[49]  J. R. Jensen,et al.  The measurement of mangrove characteristics in southwest Florida using spot multispectral data , 1991 .

[50]  F. Blasco,et al.  A remote sensing based methodology for mangrove studies in Madagascar , 1998 .

[51]  Y. Wong,et al.  Mangrove soils as sinks for wastewater-borne pollutants , 1995 .

[52]  E. Wolanski,et al.  Fine sediment trapping in two mangrove-fringed estuaries exposed to contrasting land-use intensity, Palau, Micronesia , 2004, Wetlands Ecology and Management.

[53]  A. M. Bell,et al.  Herbicides implicated as the cause of severe mangrove dieback in the Mackay region, NE Australia: consequences for marine plant habitats of the GBR World Heritage Area. , 2005, Marine pollution bulletin.

[54]  C. Den Hartog,et al.  Importance of Mangroves, Seagrass Beds and the Shallow Coral Reef as a Nursery for Important Coral Reef Fishes, Using a Visual Census Technique , 2000 .

[55]  M. Ball,et al.  Factors influencing biodiversity and distributional gradients in mangroves , 1998 .

[56]  P. Mumby,et al.  Remote Sensing Handbook for Tropical Coastal Management , 2000 .

[57]  William De Genst,et al.  High-Resolution Vegetation Data for Mangrove Research as Obtained From Aerial Photography , 2002 .

[58]  E. Wolanski,et al.  Muddy coastal waters and depleted mangrove coastlines - depleted seagrass and coral reefs , 2000 .

[59]  P. Saenger,et al.  Land from the sea: The mangrove afforestation program of Bangladesh , 1993 .

[60]  D. Klumpp,et al.  Rapid sediment accumulation and microbial mineralization in forests of the mangrove Kandelia candel in the Jiulongjiang Estuary, China , 2005 .