Table 2. Number of trees observed by site and tree species.

Site	n	N	%	Pinus durangensis		P. cooperi
				n	%	n	%
1	19	1,900	76	14	56	5	20
2	10	1,000	40	7	28	3	12
3	18	1,800	72	11	44	7	28
4	20	2,000	80	12	48	8	32
5	15	1,500	60	7	28	8	32
6	18	1,800	72	13	52	5	20
7	19	1,900	76	13	52	6	24
8	21	2,100	84	12	48	9	36
9	20	2,000	80	8	32	12	48
10	24	2,400	96	13	52	11	44
11	23	2,300	92	16	64	7	28
12	23	2,300	92	21	84	2	8
13	18	1,800	72	12	48	6	24
14	11	1,100	44	8	32	3	12
15	23	2,300	92	18	72	5	20
16	19	1,900	76	15	60	4	16
Mean	18.81	1,881.25	75.20	12.5	50	6.31	25.25

Notes.

n

number of trees recorded in site i

N

Number of trees per hectare

%

Percentage of survival