TABLE 2.

Phylogenetic diversity reached by chitinase and 16S rRNA gene sequences included in habitats used for phylogenetic analyses and expected maximal phylogenetic diversity for the respective habitats^a

Habitat	Diversity of:
	Chitinase genes			16S rRNA genes
	PDreached	PDmax	% coverage	PDreached	PDmax	% coverage
Freshwater	7.17	7.84	91.5	551.77	866.04	63.7
Tropics	19.64	22.96	85.5	1372.38	1452.78	94.5
Nontropics	25.78	27.79	92.7	1468.50	1730.13	84.9
Coastal	17.77	20.73	85.7	1468.00	1678.59	87.5
Open ocean	27.14	28.50	95.2	1500.22	1628.94	92.1
Hypersaline	9.27	29.96	30.9	553.65	783.61	70.7
Marine	33.82	34.90	96.9	2123.14	2271.65	93.5
Estuarine	14.40	26.31	54.7	984.32	1778.76	55.3
Caribbean Sea	7.10	9.29	76.4	631.05	795.40	79.3
Galapagos Islands	18.39	21.50	85.5	1059.67	1244.79	85.1
Indian Ocean	15.99	22.05	72.5	1023.01	1189.59	86.0
North American East Coast	14.54	23.44	62.0	830.96	1093.74	76.0
Sargasso Sea	18.78	21.52	87.3	854.53	1130	75.6

^aPD, phylogenetic diversity; PD_reached, phylogenetic diversity reached; PD_max, expected maximal PD. PD_max values were obtained by the extrapolation of PD rarefaction curves. The coverage was estimated as the fraction of PD_reached to PD_max.