A Bird’s Eye View of Habitat 04-17-07... · 2019-08-27 · A Bird’s Eye View of Habitat Putting...
Transcript of A Bird’s Eye View of Habitat 04-17-07... · 2019-08-27 · A Bird’s Eye View of Habitat Putting...
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A Bird’s Eye View of Habitat
Putting the pieces together
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Restoration Ecology
• Using what science has learned about living things and their interactions with their environment to re-create habitats that have been lost due to human activities.
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Revegetation
• Revegetation projects are classified as one of the following:– Reclamation: Returning disturbed land to a productive
state; The process of rehabilitating disturbed lands, or converting unproductive lands to productive uses.
• Productive?
– Restoration: The return of an ecosystem or habitat to its original community structure, natural complement of species, and natural functions
– How are these different?
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Restoration Ecology
• The science (and art) of healing scars left by human activities such as– Mining– Grazing– Agriculture– Dams
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Restoration Ecology
• In order to restore vegetation and animals we have to look at all the components of the biotic and abiotic conditions at a site– Soils, topography, water drainage, etc…
• This includes the overall landscape that surrounds the restoration and the spatial arrangement of the site and other similar areas
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Restoration Ecology
• Any good restoration project must take landscape scale issues into consideration
• Also, must be monitored to determine success
• If we build it, will “they” come?
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Landscape Ecology• Landscape =
– A large area or region that contains a patchwork (or mosaic) of different vegetation or ecosystem types
– A group of interacting ecosystems occupying adjacent geographical areas
• Examples:– The San Pedro River watershed– Yellowstone National Park– The Phoenix Metropolitan area
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San Pedro River, SE Arizona
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Yellowstone National Park
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Landscape Ecology• Studies the influence of spatial arrangement of
ecosystems on ecological processes (and vice versa)– How do ecological processes determine landscape
pattern?• E.g., How does fire form patterns in vegetation?
– How does landscape pattern influence ecological processes?
• E.g., How does the composition and arrangement of patches affect the ability of a predator to find food?
• Often uses Geographic Information Systems (GIS) as a tool
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Terms to Describe Landscape Pattern
• Patch– a contiguous area covered by one ecosystem or
vegetation type
• Matrix– the background or dominant ecosystem or land-use
type in a landscape
• Corridor– a linear strip of habitat that may link different patches
and act as a conduit for movement of organisms
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Agricultural Matrix
Riparian Corridor
Woodland Patch
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Effects of Land Use Change on Landscape Pattern
Human land use often fragments intact habitats
Ex: Cadiz township, Wisconsin (1831-1950)
(forest in green, cleared in white)
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Restoration can connect fragments
Forest expansion with agricultural abandonment in a New England landscape
(forest in black)(from Foster 1992)
Effects of Land Use Change on Landscape Pattern
1830 1900
19651938
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Edge vs. Interior Habitat• Fragmentation increases edge and
decreases interior habitat– Edge = the zone of habitat near the boundary
between one patch type and another– Interior = the zone of habitat that is on the inside of
a patch, far from the edge
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What effects does forest fragmentation have on birds in the eastern US?
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Landscape Maps for Exercise 1 40%
60%
20%
10%
80%
Gray cells = forest
White cells = cleared
KEY:
10% = % of forest cleared
40%40%
60%60%
20%20%
10%10%
80%80%
Gray cells = forest
White cells = cleared
KEY:
10% = % of forest cleared
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Species rules for Exercise 1
Ovenbird• Edge-avoiding, forest interior species• Rule: only forest cells that do not
share a border with cleared cells
10% cleared, 90 forest cells remainX X X X X X X X XX X X X X XX X X XX X XX X X X X
X X X X XX X X X X X X
X X X X X X X XX X X X X X XX X X X X X X X X
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Species rules for Exercise 1
Indigo Bunting• Forest edge exploiter• Rule: only forest cells that do
share a border with cleared cells
10% cleared, 90 forest cells remainX
X X XX X X XX X X X X
X X XX X X X
X XX X
X XX
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Species rules for Exercise 1
Red-eyed Vireo• Area-sensitive forest species, no
edge response• Rule: forest patches composed of at
least 3 contiguous cells
50% cleared, 50 forest cells remainX X X
XXX X
X X X X XX X X X X X X X X
X X X X XX X X X X
X X X XX X X X X
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Species rules for Exercise 1
Red-shouldered Hawk• Area-sensitive forest species, no
edge response• Rule: forest patches composed of at
least 9 contiguous cells
50% cleared, 50 forest cells remain
XX X
X X X X XX X X X X X X X X
X X X X XX X X
X X XX X X
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Species rules for Exercise 1
Eastern Meadowlark• Open habitat (grassland) species, edge
avoider• Rule: only cleared cells that do not
share a border with a forest cell
50% cleared, 50 forest cells remainX
X XX
X
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0
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# ce
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OvenbirdVireoHawkBuntingMeadowlark
Changes in Habitat Availability with Forest Fragmentation
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Changes in Habitat Availability with Forest Fragmentation
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Changes in Habitat Availability with Forest Fragmentation
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Changes in Habitat Availability with Forest Fragmentation
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Changes in Habitat Availability with Forest Fragmentation
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Changes in Habitat Availability with Forest Fragmentation
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Changes in Habitat Availability with Forest Fragmentation
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% F
ores
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ls S
uita
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OvenbirdVireoHawkBunting
% of Remaining Forest Cells that are Suitable Habitat
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Implications• Species differ in response to fragmentation
based on their habitat preferences and other ecological characteristics
• Fragmentation reduces area of a particular habitat, but proportionally causes a much greater loss of interior habitat
• There may be thresholds of % habitat loss beyond which big changes in habitat suitability occur
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50%
50%
50%50%
50%
50%
BA
DC
E F
Landscape Maps for
Exercise 2
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Implications• The spatial pattern of habitat loss has a
strong effect on habitat suitability and populations of different species.
• How would you manage the forest to maintain the most habitat for all species?