Supplemental Tables
Table S1. Life table data for brook trout from West Brook. Demographic rates were empirically
derived. These data were used as input for program AgeNe to determine the ratio of Nb to Ne.
Age
1
2
3
4
5
Annual Survival
(95% CI)
0.253 (0.236-0.271)
0.145 (0.135-0.156)
0.177 (0.156-0.199)
0.083 (0.044-0.137)
0.056 (0.005-0.208)
Birth
0.97
29.86
120.38
240.53
314.46
Birth Lower
Range
0.00
16.45
95.09
159.62
217.02
Birth Upper
Range
1.92
41.91
157.53
362.47
455.65
Table S2. Demographic and environmental data for two brook trout populations (WB and FG). Both the year of a reproductive bout
(breeding year) and the year of the subsequent spring-born cohort (cohort birth year) are shown. NG is the number of fish
̂𝑏 for each cohort was estimated with LDNE. 𝑁
̂𝑌𝑂𝑌 is the estimated number of YOY sampled in the fall for a given
genotyped. 𝑁
̂𝐶 is the number of adults (age-1 and older) estimated from the fall previous to the listed spring-defined
spring-defined cohort. 𝑁
̂𝑏 / 𝑁
̂𝐶 ratio is based on 𝑁
̂𝑏 from time t and 𝑁
̂𝐶 from time t - 1. Autumn flow is mean stream flow for the time window
cohort. The 𝑁
1 October - 31 December of the year preceding the cohort (time t - 1). Winter flow is mean stream flow 1 January - 28 February of
time t. Spring is the mean flow from 1 March - 31 May of time t. Flow is in cubic meters per second (cms). For years lacking
probability of detection (p) estimates, we used average p across years and calculated a point estimate for abundance (either YOY or
adult) only. For WB, only the mainstem was sampled in 2001 and therefore the connected tributaries (OS and OL) are not included in
̂𝑏 .
the estimates of 𝑁
Cohort
birth
year (t)
West Brook (WB)
Breeding
year (t-1)
NG
(t)
2000
2001
1094
2001
2002
789
2002
2003
909
2003
2004
816
2004
2005
590
̂𝑏 (t)
𝑁
124.4 (110.4139.3)
94.6 (84.7105.3)
152.7 (131.2176.8)
108.6 (95.3123.2)
157.3 (139.6177.0)
̂𝑏 /𝑁
̂𝐶
𝑁
Autumn
flow
(t - 1)
Winter
flow
(t)
Spring
flow
(t)
̂𝑌𝑂𝑌 (t)
𝑁
̂𝐶 (t-1)
𝑁
Adult
density
--
--
--
--
0.19
0.57
0.77
--
--
0.52
0.04
0.25
0.31
1075.3 (618.13218.2)
0.23
0.11
0.24
0.54
0.73
0.10
0.15
0.75
0.44
0.64
0.06
0.33
0.34
0.54
0.73
751.4 (432.82268.4)
845.3 (751.9975.7)
1101.7 (1004.71234.5)
501.7 (458.9573.3)
704.3 (625.1818.7)
470.6 (432.0522.2)
2005
2006
432
2006
2007
288
2007
2008
513
2008
2009
746
52.8 (45.560.9)
141.2 (121.6164.5)
65.1 (55.875.5)
109.3 (95.5124.6)
342.2 (299.8399.0)
283.6 (244.4369.3)
614.0 (561.8702.8)
1132.2 (990.01371.0)
579.7 (526.7666.6)
352.8 (307.4413.3)
220.0 (193.6265.2)
208.0 (182.3257.1)
3854.8
0.09
0.09
0.92
0.44
0.37
0.05
0.40
0.39
0.68
0.96
0.04
0.29
0.07
0.81
0.90
0.03
0.52
0.50
0.44
0.50
439.9
--
0.27
0.17
0.10
0.13
1167 (0-2548.1)
416
--
0.29
0.10
0.13
0.06
973 (614.81332.0)
1438 (930.21944.9)
904 (588.61220.2)
889 (760.91016.3)
--
--
--
--
--
642 (566.9716.4)
--
--
--
--
--
--
0.13
0.02
0.07
0.11
--
0.13
0.04
0.11
0.14
--
0.10
0.06
0.13
0.18
Fridley Gap (FG)
116.6 (98.6136.9)
118.7 (87.8168.8)
2003
2004
899
2005
2006
96
2006
2007
--
--
2007
2008
--
--
2008
2009
69
2009
2010
99
2010
2011
211
82.5 (63.7110.6)
131.2 (95.0192.7)
101.6 (88.3117.1)
459 (188-1789)
496 (377-663)
612 (489.5734.6)
1028 (901.41154.3)
1004 (8821145)