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International Journal of Latest Research in Science and Technology

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TROPICAL SEAGRASS DENSITY PHASE SHIFT DETECTION USING SPATIAL ANALYSIS TOOLS

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International Journal of Latest Research in Science and Technology Vol.5 Issue 6, pp 1-5,Year 2016

TROPICAL SEAGRASS DENSITY PHASE SHIFT DETECTION USING SPATIAL ANALYSIS TOOLS

Anisah Lee Abdullah, Anastacia Amanda Anscelly

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Received : 31 October 2016; Accepted : 12 November 2016 ; Published : 31 December 2016

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Article No. 10686
Abstract

Coastal development activities, land use-cover change and agricultural practices occurring in phases and according to state plans may have its impact on the directional trend of seagrass abundance and its density, thus presumably causing ‘phase shifts’ in its distribution. This study was carried out to ascertain the possible ‘phase shift’ effect of coastal land reclamation and development on existing seagrass density spatial distribution of Halophila ovalis (R.Br.) Hook.f. and Halophila beccarii Asch. surrounding a man-made islet within Penang waters. The ArcGIS 10 spatial analysis tools, Standard Deviational Ellipse (SDE) and Standard Distance (SD), were applied to determine ‘phase shifts’ as an indicator of possible effect of coastal land reclamation on the seagrass density distribution. Seagrass shoot densities data used were from year 2003 and 2009 representing pre-coastal development period, and 2009-2012 representing on-going and ending of coastal development period. Results showed SDE of seagrass experienced shifts from west to north-west direction from 2003 to 2012, away from the coastal land reclamation site. SD result showed seagrass distribution in the islet shifted from west to east, and was more compacted and concentrated in 2012. The shifts of seagrass mean centre from west to the east also coincided with SD analysis where the largest distance value of 28.21m calculated from centroid occurred in 2012. The directional trend, compactness and mean centre of seagrass, i.e. the ‘shift’, observed to be directed away and concentrated further from the coastal development site by 2012.

Key Words   
Coastal reclamation, Halophila ovali, Halophila beccarii, Standard Deviational Ell

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To cite this article

Anisah Lee Abdullah, Anastacia Amanda Anscelly , " Tropical Seagrass Density Phase Shift Detection Using Spatial Analysis Tools ", International Journal of Latest Research in Science and Technology . Vol. 5, Issue 6, pp 1-5 , 2016

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