finish pva. begin habitat fragmentation and loss wed. mar. 16
TRANSCRIPT
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Finish PVA.Begin Habitat
Fragmentation and LossWed. Mar. 16
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PVA Output
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Orangutans and PVA --1000 yr MVP
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Isle Royale NP Wolves and PVA
Failure
Hindcast PVA "predicted" 1980's management practices and conditions would yield populations greater than the MVP.
• Parvovirus
• Prey decline
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Types of PVAs
Count-based PVAno real demographic data – population parameters
are based on whole populations.
Demographic (Stage-Based) PVA
Multi-site PVAs (some types are spatially explicit)
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Rules of Use
1. Use the PVA consistent with available high quality data.
2. Understand the workings of canned models
3. Provide confidence intervals
4. Relative gauge –decline? steady? increase?
5. Don't go too far, especially in generational terms.
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Critiques of PVAs
Uncertainties in the data – carried forward!
Requirement for very high quality data sets
Emphasis on a single species – this is usually not the real issue in conservation (it can be, however).
Use in determining whether or not a species will drop below its "ecologically functional population size."
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Habitat Degradation and Loss
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Land Use History in New
England
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Results of Land Use in New England
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Agroecology 101
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Loss of Native Vegetation in the USA
What is the single greatest cause of diversity loss in native plant diversity in the US?Why are some areas less touched?
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Forms of Habitat
Degradation
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Land Use Intensity and Species Loss in Africa
Why do bird populations seem to do a bit better, relatively speaking.
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Documenting Habitat Loss
Note recent trend to loss of wetlands and tropical lands and even some desert.
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Conservation Risk Index
(by WWF and TNC)
CRI =
CRI = Converted/Preserved
Critical = CRI>25 + >50% conversionEndangered = CRI>10 + >40%Vulnerable = CRI>2 + >20%
Critical = 64Endangered = 80Vulnerable = 161
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At- Risk Plant Diversity Hotspots
Map generated by conservation international
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Endangered Ecoregions
Critical = CRI>25 + >50% conversionEndangered = CRI>10 + >40%Vulnerable = CRI>2 + >20%
Critical = 64 (dark grey)Endangered = 80 (medium grey)Vulnerable = 161 (light grey)
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Some Examples of Habitat Degradation and Loss
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Habitat Conversion:Clear Cutting
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"Clear-Cutting"
in Forests
and Oceans
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Damage from
Trawlingwww.skytruth.org
Trails tend to persist many hours
http://archives.starbulletin.com/2008/02/25/news/story01.html
http://i.livescience.com/images/080220-trawling-plumes-02.jpg
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Trawls
http://app2.iris.usm.maine.edu/gulfofmaine-censusdev/wp-content/images/Technology/STPCOImage04b.jpg
Bar Trawl
http://app2.iris.usm.maine.edu/gulfofmaine-censusdev/wp-content/images/Technology/STPCOImage01b.jpg
Otter Trawl
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Habitat Conversion:The South Florida Example
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http://fpc.dos.state.fl.us/r
http://farm6.static.flickr.com/
Draining and Managing the "Glades"
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http://en.wikipedia.org/wiki/File:USGS_Northern_Everglades_image_2001_.jpg
Effects of Dikes and
Canals
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http://thisisbeirut.files.wordpress.com/2010/09/
Natural and Agricultural Zones