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March’s Point Great Blue Heron Nest Survey results: December 13, 2003 |
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2003 Results |
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2002 Results |
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Total Number of Nests: |
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580 |
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507 |
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Total Number of Active Nests: |
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560 |
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494 |
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Total Number of Blown Down Nests Observed: |
19 |
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14 |
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Total Number of Trees Examined: |
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333 |
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302 |
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Total Number of Nest Trees used: |
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272 |
(31 new in 2003) |
249 |
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Nest Tree Species Composition: |
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location |
tree species |
common name |
# of trees |
% of total trees |
# of active nests |
% of total nests |
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March’s Point |
Alnus rubra |
Red Alder |
155 |
57.0 |
304 |
54.3 |
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March’s Point |
Abies grandis |
Grand Fir |
30 |
11.0 |
47 |
8.4 |
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March’s Point |
Acer macrophyllum |
Big-leaf Maple |
36 |
13.2 |
119 |
21.3 |
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March’s Point |
Pseudotsuga menziesii |
Douglas-fir |
17 |
6.3 |
49 |
8.8 |
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March’s Point |
Salix sp. |
Willow |
10 |
3.7 |
16 |
2.9 |
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March’s Point |
Thuja plicata |
Western Redcedar |
17 |
6.3 |
18 |
3.2 |
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March’s Point |
Tsuga heterophylla |
Western Hemlock |
3 |
1.1 |
3 |
0.5 |
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March’s Point |
Prunus emarginata |
Bitter Cherry |
3 |
1.1 |
3 |
0.5 |
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March’s Point |
unknown species (conifer) |
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1 |
0.4 |
1 |
0.2 |
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totals |
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272 |
100 |
560 |
100 |