Table 3.

Values of the reciprocal of Simpson’s Diversity Index (SDI) and tree survival, for each community (one large, two medium, and two small communities) and by quadrant. Standard errors for marginal means of Simpson’s index are included. No significant differences were detected for either diversity or survival between quadrants or by community size.

Community population category		Quadrant				Average for community size	Standard error of marginal mean (SDI)
Community population category		NE	NW	SE	SW	Average for community size	Standard error of marginal mean (SDI)
>10,000	Diversity	7.06	8.14	2.68	3.81
					6.94^*	5.81	1.53
	Survival (%)	84	84	94	89
					98^*	92
2,000–10,000	Diversity	12.42	2.69	6.75	6.79
		5.16	3.83	6.84	13.48	7.24	1.16
	Survival (%)	91	91	100	98
		87	90	87	92	92
<2,000	Diversity	4.08	4.76	9.10	7.70
		6.88	2.46	1.50	4.00	5.06	1.16
	Survival (%)	92	89	100	59
		94	85	100	90	88
Average for quadrant	Diversity	7.11	5.00	4.93	7.12
	Survival (%)	89	88	94	93
Standard error of SDI marginal mean		1.54	1.54	1.54	1.34

↵*Two large communities were sampled in the southwest quadrant.