Observations of dugongs at Aldabra Atoll, western Indian Ocean: lagoon habitat mapping and spatial analysis of sighting records
INTERNATIONAL JOURNAL OF GEOGRAPHICAL INFORMATION SCIENCE(2012)
Abstract
Until recently, it was thought that dugongs Dugong dugon were extinct in the Seychelles. However, a collection of sightings at Aldabra Atoll, a World Heritage Site in the Seychelles, has renewed interest in dugong distribution in the western Indian Ocean. This article consolidates the records of dugong sightings held in the Aldabra Research Station library and explores their spatial patterning. The locations of sightings 2001–2009 are plotted onto a high-resolution benthic habitat map of the Aldabra lagoon created by classifying a QuickBird satellite remote-sensing image in January 2009. A spatial cluster detection procedure is applied to point records of sightings to reveal a statistically significant cluster of sightings in the north-west of the lagoon, at Bras Monsieur Clairemont, suggesting a mutual co-existence of dugongs and seagrass beds. A habitat suitability model combines the point data set of dugong sightings within the continuous benthic habitat map and identifies the central western area as containing the most suitable habitat for dugong inside the Aldabra lagoon.
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Key words
spatial analysis,aldabra lagoon,high-resolution benthic habitat map,aldabra atoll,continuous benthic habitat map,lagoon habitat mapping,dugong distribution,western indian ocean,aldabra research station library,habitat suitability model,suitable habitat,sighting record,dugong sighting,central western area,spatial pattern,observations,remote sensing,atoll,analysis,records,cluster analysis,habitat,spatial,high resolution,statistical significance
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