Environmental Engineering Reference
In-Depth Information
Table 1
Kernel home range sizes (ha/km
2
) for the adult male, adult female and juvenile female
falcons tracked at the proposed Hurunui Wind Farm
Home range size ha (km
2
)
Adult male
(autumn/winter
2010)
Adult male
(summer
2010/2011)
Adult female
(autumn/winter
2010)
Juvenile female
(summer
2010/2011)
Kernel
probability (%)
95
1,447 (14.47)
1,660 (16.60)
710 (7.10)
132 (1.32)
75
435 (4.35)
568 (5.68)
209 (2.09)
37 (0.37)
50
119 (1.19)
280 (2.80)
67 (0.67)
13 (0.13)
Table 2
The number of 200 m turbine buffers intersecting the home range kernels (95, 75 and
50 % kernels) of the falcons studied during the autumn/winter 2010 and summer 2010/2011
tracking periods. Percen
t of total (n =
33) turb
ines are sho
wn in pa
rentheses
Falcon gender
and tracking
period
Male autumn/
winte
r 2010
Female autumn/
winter
2010
Male summer
2010/
2011
Juvenile summer
2010/2
011
Kernel Size %
95
75
50
95
75
50
95
75
50
95
75
50
Number of
turbines
in kernel
15
8
4
14
7
2
24
13
9
8
1
0
(45)
(24)
(12)
(42)
(21)
(6)
(73)
(39)
(27)
(24)
(3)
(0)
During the summer monitoring period, the male's home range was consistently
larger than during the previous autumn/winter at all kernel levels analysed (Table
1
).
During both tracking periods the male's 50 % kernel contained the nest site, as did
the adult female's 50 % kernel during the winter tracking period. However, the
shape of the home ranges differed between the two periods. During the 2010
autumn/winter period the male's 95 and 75 % kernels extended out to the west of the
wind farm. During the summer 2011 tracking period, the falcon shifted the extremity
of his home range to the north and in doing so increased the number of turbines with
which he would potentially interact from 15 to 24, a 28 % increase (Table
2
). The
juvenile female's pre-dispersal home range was considerably smaller than the male's
summer home range and the adult female's winter home range and the centre of this
bird's kernels were south and east of the nest site.
Potential to Interact with Turbines
The documented home ranges of all three birds had potential to interact with some
of the proposed turbines (Table
2
). The adult male's summer home range contained
the most proposed turbine locations. The adult males and the adult female's 95 and
75 % autumn/winter kernels encompassed similar numbers of turbine locations.
