Annual Variation of Abundance and Composition in Forest Bird Assemblages on Navarino Island, Cape Horn Biosphere Reserve, Chile Page: 241
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CAPE HORN FOREST BIRD COMMUNITY DYNAMICS
TABLE 2. Relative abundance (%) of forest bird species surveyed with point-counts in each of the seasons
of the year between December 2002 and November 2003 in the Omora Ethnobotanical Park, Chile (550S),
with species listed from most to least abundant. N = number of individuals recorded.
Species Percentage (%)Year
Thorn-tailed Rayadito
Patagonian Sierra-Finch
Black-chinned Siskin
Austral Thrush
Southern House Wren
White-crested Elaenia
Rufous-collared Sparrow
Austral Parakeet
Chimango Caracara
White-throated Treerunner
Magellanic Woodpecker
Tufted Tit-Tyrant
Chilean Swallow
Black-faced Ibis
Fire-eyed Diucon
Magellanic Tapaculo
Austral Blackbird
Southern Caracara
Patagonian Tyrant
Cinclodes spp.
Dark-bellied Cinclodes
Upland Goose
Ashy-headed Goose
Austral Pygmy-Owl
Southern Lapwing
Unidentified species
Total N28.5
16.9
14.6
8.6
7.3
6.8
3.0
2.4
2.3
1.8
1.6
1.4
0.9
0.8
0.7
0.4
0.4
0.3
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.8
1596Summer
(Dec21-Mar20)
19.6
13.4
17.1
5.7
12.6
14.1
1.4
7.1
1.4
1.4
0.8
0.2
2.4
0.6
0.4
0.6
0.0
0.0
0.0
0.0
0.0
0.0
0.2
0.0
0.0
1.2
509Fall
(Mar21-Jun20)
30.7
19.7
23.8
12.1
0.0
0.0
0.0
0.0
4.5
2.1
2.4
0.7
0.0
0.0
1.4
0.3
0.7
0.0
0.7
0.0
0.0
0.0
0.0
0.0
0.0
1.0
290Winter
(Jun21-Sep20)
40.5
17.5
15.6
8.1
0.0
0.0
3.0
0.5
2.7
3.2
2.2
3.5
0.0
0.0
1.2
0.2
0.0
1.0
0.0
0.2
0.2
0.0
0.0
0.2
0.0
0.0
405Spring
(Sep21-Dec20)
26.0
18.6
3.6
10.5
13.3
9.4
7.4
0.3
1.5
0.5
1.5
1.3
0.5
2.3
0.0
0.3
1.0
0.3
0.0
0.3
0.0
0.5
0.0
0.0
0.3
0.8
392Chimango Caracara (Milvago chimango), South-
ern Caracara (Caracara plancus), Austral
Pygmy-Owl (Glaucidium nanum), Dark-bellied
Cinclodes (Cinclodes patagonicus), and Blue-
and-white Swallow. Aquatic and semi-aquatic
species, namely geese, lapwings, and cin-
clodes, are uncommon in the forest, but may
use such habitats when they are close to fresh-
water or coastal ecosystems. This greater spe-
cies richness for forest sites in our study was a
direct consequence of the year-long surveythat provided a better detection of species
without conspicuous behavioral or song char-
acteristics, such as owls, or of those that use
the forest only occasionally or specialize in
rare microhabitats (e.g., freshwater edges).
Factors affecting forest bird assemblages in the Cape
Horn Biosphere Reserve. The habitat with the
highest avian abundance was shrubland,
which differs from findings on Chiloe Island
where more individuals were recorded at for-241
i
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Ippi, Silvina; Anderson, Christopher B.; Rozzi, Ricardo, 1960- & Elphick, Chris S. Annual Variation of Abundance and Composition in Forest Bird Assemblages on Navarino Island, Cape Horn Biosphere Reserve, Chile, article, 2009; [Caracas, Venezuela]. (https://digital.library.unt.edu/ark:/67531/metadc97951/m1/11/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT College of Arts and Sciences.