How many points to sample in a 50m transect?
• Precision estimates follow an exponential curve as the number of sampling points are increased. When three reefs were sampled with coral cover of 8,36 and 61% there was no difference in estimates of cover when 200 random points were sampled (Christie and Mapstone (unpub). On the GBR this range of values is a good approximation for the distribution of values at benthic group level. A pilot study can establish the range of values likely to be encountered and sampling intensity adjusted accordingly • Davison (1997) found that at the level of highest resolution (species or genus level for coral) estimates of cover remained variable despite doubling the number of points sampled to 400. 75% of corals had <0.8 percent cover and a patchy distribution. Re laying the transect indicated that rank abundances were highly variable for all but the most common coral categories. • Ryan (unpub) used a combination of simulation modelling and video transect analysis to calculate that the optimal samplin
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