Landscapes Forest and Global Change - ESA - Escola Superior ...

K. L. Martin & P.C. Goebel 2010. Impact of hemlock decline on successional pathways and ecosystem function
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Figure 1: USDA Forest Service 2009 map of hemlock woolly adelgid spread across the range of T.
canadensis. Study sites have been added with a star, moving west to east: Ohio, West Virginia, and
Virginia.
Table 1: Comparisons of richness and diversity in Tsuga canadensis ravines at three transects centered
upslope at 10, 30, and 50 m from headwater streams in Ohio, USA. Comparisons of means were
calculated with one-way analysis of variance. Significant results are indicated: ** α = 0.05, * α = 0.1.
Sub-canopy species richness F = 3.87, P = 0.037; Sub-canopy diversity F = 3.10, P = 0.066; Sub-canopy
functional richness F = 3.02, P = 0.070; Canopy species richness F = 2.57, P = 0.100; Canopy functional
richness F= 3.95, P = 0.035. In all cases d.f.= 2. Means separation as determined by Tukey’s test is
indicated by letters.
10 m 30 m 50 m
Sapling species richness 1.63 ± 0.18 2.5± 0.68 2.38± 0.50
Sapling species diversity 0.20 ± 0.06 0.40 ± 0.19 0.42 ± 0.17
Percent saplings Tsuga canadensis 93.6 ± 2.3 86.6 ± 6.5 77.0 ± 10.4
Sub-canopy species richness** 2.50 ± 0.38 a 3.38 ± 0.38 ab 4.13 ± 0.48 b
Sub-canopy species diversity* 0.48 ± 0.14 a 0.58 ± 0.08 ab 0.93 ± 0.17 b
Sub-canopy functional richness* 2.50 ± 0.48 a 3.25 ± 0.37 ab 3.88 ± 0.13 b
Sub-canopy functional diversity* 0.40 ± 0.14 a 0.45 ± 0.11 ab 0.81 ±0.13 b
Canopy species richness* 4.00 ± 0.27 a 4.63 ± 0.32 ab 5.13 ± 0.44 b
Canopy species diversity 1.22 ± 0.09 1.23 ± 0.10 1.31 ± 0.11
Canopy functional richness** 3.63 ± 0.26 a 4.13 ± 0.23 ab 4.11 ±0.26 b
Canopy functional diversity 1.14 ± 0.09 1.11 ± 0.09 1.11 ± 0.08
Forest Landscapes and Global Change-New Frontiers in Management, Conservation and Restoration. Proceedings of the IUFRO Landscape Ecology
Working Group International Conference, September 21-27, 2010, Bragança, Portugal. J.C. Azevedo, M. Feliciano, J. Castro & M.A. Pinto (eds.)
2010, Instituto Politécnico de Bragança, Bragança, Portugal.