Variability in the estimated minimum number of quadrats yielding the asymptote value of diversity in different seaweed communities.
1993
Rollon R.N. | Tiquio J.P. | Fortes M.D.
This study explored the variability of the theoretical minimum number of quadrats in sampling seaweed communities. Using 40 data sets obtained from the same number of sites, "diversity-area" curves, instead of the commonly used "species-area" curves were estimated to determine the minimum sample size. Data sets were fitted in a hyperbolic tangent function. The range of the maximum diversity values throughout the Philippines was wide, having no apparent spatial pattern. The range of the estimated mimimum number of quadrats (2/B) in sampling seaweed communities was also wide and found not correlated with diversity, although 80 percent of all the 2/Bs had values less than 20.0 25 sq m quadrats. Brillouin's diversity (H) was found to have significant linear correlation with Shannon-Weiner diversity (H'). Results on looking at the effect of sampling intensity in estimating the model parameters ("diversity-area") showed negative findings. It was shown that it is possible to sample 10 quadrats in a seaweed community and still get the same parameters estimates as sampling 50 quadrats.
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