Mar 19 Vegetation Structure: Controls, Patterns, Consequences
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1 Mar 19 Vegetation Structure: Controls, Patterns, Consequences
2 Landscape Patterns
3 Human Land Use Effects
4 Topics Stand Level Description of vegetation structure Drivers Consequences Landscape Level Habitat fragmentation defined Basis in island biogeography Ecological consequences Next Week: Variation among biomes Stand level forest structure and consequences for biodiversity Forest fragmentation effects
5 Stand-Level Vegetation Structure Vegetation Structure Distribution of vegetation biomass horizontally and vertically.
6 Stand-Level Vegetation Structure Vegetation Structure Distribution of vegetation biomass horizontally and vertically. Canopy Cover Percent cover of by height class or vegetation strata (canopy, subcanopy, shrub layer, understory)
7 Stand-Level Vegetation Structure Vegetation Structure Distribution of vegetation biomass horizontally and vertically. Canopy Cover Percent cover of by height class or vegetation strata (canopy, subcanopy, shrub layer, understory)
8 Stand-Level Vegetation Structure Vegetation Structure Distribution of vegetation biomass horizontally and vertically. Canopy Cover Percent cover of vegetation strata (canopy, subcanopy, shrub layer, understory, or by height class Foliage height diversity Distribution of canopy cover among forest strata expressed as a diversity index. H is low H is high H is intermediate
9 Stand-Level Vegetation Structure Vegetation Structure Distribution of vegetation biomass horizontally and vertically. Canopy Cover Percent cover of vegetation strata (canopy, subcanopy, shrub layer, understory, or by height class Foliage height diversity Distribution of canopy cover among forest strata. Stem density by size class
10 Stand-Level Vegetation Structure Vegetation Structure Distribution of vegetation biomass horizontally and vertically. Canopy Cover Percent cover of vegetation strata (canopy, subcanopy, shrub layer, understory, or by height class Foliage height diversity Distribution of canopy cover among forest strata. Stem density by size class Snag and coarse woody debris density by size class and decomposition class.
11 Seral Stage Stand-Level Vegetation Structure - Drivers
12 Stand-Level Vegetation Structure - Drivers Natural Disturbance
13 Growth Rates Stand-Level Vegetation Structure - Drivers Coastal Redwood forest Boreal forest
14 Stand-Level Vegetation Structure - Drivers Land Management Ecological forestry Ecological forestry uses silviculture to mimic natural disturbance and maintain withinstand and landscape structure. Traditional clearcut forestry
15 Stand-Level Vegetation Structure - Consequences Microclimate Decomposition and nutrient cycling Forest Productivity Fuel Loads and fire behavior
16 Biodiversity Stand-Level Vegetation Structure - Consequences
17 Habitat Fragmentation and Edge Effects
18 Habitat Fragmentation: Breaking up of habitat into smaller pieces More Specifically: Reduction in habitat area Cadiz township, WI Curtis 1956 Decrease in patch size (increase in edge effects) Increase in distance among patches (change in connectivity)
19 MacArthur and Wilson A theory of island biogeography. Princeton Press.
20 Species Area Relationship
21 Species Area Relationship S=cA z number of species=intercept*area slope
22 Smaller islands have fewer species than large islands. Why?
23 MacArthur and Wilson Theory of Island Biogeography
24 Small island Large island S 2 MacArthur and Wilson Theory of Island Biogeography
25 Near island Far island S 2 MacArthur and Wilson Theory of Island Biogeography
26 MacArthur and Wilson Theory of Island Biogeography
27 Implications for Habitat Islands?
28 Habitat as islands? If habitats in an inhospitible matrix act as islands, then we expect smaller, more isolated habitat patches hold fewer species.
29 Ecological Consequences of Fragmentation Reduction in habitat area - reduction in population sizes; - decreased habitat heterogeneity.
30 Ecological Consequences of Fragmentation Reduction in habitat area - reduction in population sizes; Figure 2. Relation critical reserve size and female home range size calculated for 10 species of large carnivore. r 2 = 0.84, F 1,8 = 42.1, P < ) Critical reserve size estimated by using the logistic regression models to predict the area at which populations persisted with a probability of 50%. (Woodroffe and Ginsberg 1998)
31 Ecological Consequences of Fragmentation Reduction in habitat area - reduction in population sizes; - decreased habitat heterogeneity.
32 Ecological Consequences of Fragmentation Reduction in habitat area - reduction in population sizes; decreased habitat heterogeneity. Reduction in Patch Size - Increasing edge effects
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34 Hypotheses about edge effects
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37 Hypotheses about edge effects
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40 Bird distributions across clearcut/forest edges
41 Case Study Eastern Deciduous Forest: Where have the Birds Gone?
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45 Ecological Consequences of Fragmentation Reduction in habitat area - reduction in population sizes; decreased habitat heterogeneity. Reduction in Patch Size - Increasing edge effects Patch Isolation - Less exchange of organisms
46 Ecological Consequences of Fragmentation Patch Isolation - Less exchange of organisms Theobald et al. 2011
47 Management of Landscape Pattern Natural disturbance vs traditional forestry and ecological forestry
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