Table 2.

Soil nutrients by source of island material and forest type

	Original material	Fill material
	Mean ± SE	Mean ± SE	t (df)	P
Cocos forests
Nitrate (μg/g)	6.9 ± 1.5	3.3 ± 0.38	2.64 (30)	0.01**
Ammonium (μg/g)	53.6 ± 9.3	32.5 ± 9.2	2.25 (24)	0.03**
Phosphate (μg/g)	3.2 ± 0.57	0.6 ± 0.17	5.74 (26)	<0.0001**
pH	7.2 ± 0.23	7.9 ± 0.04	3.17 (16)	0.006**
PT forests
Nitrate (μg/g)	138.6 ± 43.7	70.8 ± 28.7	0.79 (21)	0.44
Ammonium (μg/g)	65.4 ± 6.6	68.3 ± 3.9	0.38 (24)	0.70
Phosphate (μg/g)	7.4 ± 1.4	4.3 ± 0.9	1.67 (20)	0.11
pH	6.9 ± 0.27	7.1 ± 0.2	0.46 (18)	0.65

Soil nutrients from transects on islets naturally formed or created by fill material from dredge spoilings. Results are separated by forest type as either dominated (>75% basal area) by Cocos nucifera (Cocos) or by Pisonia grandis and Tournefortia argentea (PT forests). Significant results, determined using Welch's two-sample T-tests (after subsequent Bonferroni corrections) are marked with **.