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- W2266429812 abstract "Digital imagery techniques for quantifying the benthos are increasingly used to monitor the health of coral reefs. There are many techniques to assess coral habitats from images, but there is no clear answer as to which one is the most effective. The aim of this study was to compare the effectiveness and relative cost (processing time) of three image analysis techniques commonly used to assess coral/benthic cover and coral bleaching. Digital photographs, taken 1 m above the substrate at 1 m intervals along 16 transects (50 images per transect), were used to examine the extent of coral cover and bleaching within coral communities of the Montebello and Barrow Islands in February 2011, following a temperature anomaly event. Each image was evaluated by: 1. assessing habitat under six randomly placed points (‘point count’); 2. dividing images into 20 square blocks and recording the dominant item in each block (‘block’); and 3. visually estimating benthic cover and bleaching without reference to points or grids (‘visual’). Overall, there was a high degree of congruence between the commonly used techniques and there were no significant differences when comparing coral cover or the extent of bleaching. Similarly, there was no detectable difference in the precision of coral and bleaching estimates made using the three techniques. However, analyses carried out using the point count and visual techniques were quicker and therefore more efficient than the block technique. This study demonstrated that the techniques commonly used to assess coral cover and bleaching from digital images are compatible and that they may be combined to provide greater spatial and temporal assessment of coral reef condition." @default.
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- W2266429812 date "2012-01-01" @default.
- W2266429812 modified "2023-09-23" @default.
- W2266429812 title "Comparison of three digital image analysis techniques for assessment of coral cover and bleaching" @default.
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