406 lect11 2008 exctinctionetc...
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Lecture 11, 30 Sept 2008Extinction
Conservation BiologyECOL 406R/506R
University of ArizonaFall 2008
Bonine & Epps
Lab Friday-Sunday 17-19 October (leave 1230 Friday [west side BSE], return 1830h on Sunday)Hat, water bottle, food [plate, cup, utensils?], snacks, $?, sunscreen, close-toed shoes, layers, pants, binos, (cooler?, jug), ID/VISA- Readings on Course Website
506 meet at 1505h today
Upcoming ReadingsThurs 02 October: Primack pp 109-117; Thomas & Reid 2007 Tues 07 October: Primack Chs 5&6; Dodo excerpt; Panther PVA (skim)Thurs 09 October: xxConservation Genetics
-Tues Seminar-Writing Prompts-506 today? Thurs? Primack Ch5,
Harper et al. 2008
NO LAB 31 OCTOBER
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Study Abroad Information Opportunities, Fall 2008
Study Abroad (S.A.) Open HouseFriday, Oct. 3, 2008
S.A. Office, 11am-1pm
S.A. Fall FairWednesday, Nov. 5, 2008
UA Mall, 10am-2pm
Study Abroad Info Sessions :
EUROPEThursday, September 4th
12-1pm Student Union Agave RoomAUSTRALIA, NEW ZEALAND & FIJI
Wednesday, September 10th12-1pm Student Union Agave Room
AFRICAMonday, September 15th
12-1pm Student Union Agave RoomPUERTO RICO & GUATEMALA
Tuesday, September 16th12-1pm Student Union Copper Room
ITALYThursday, September 18th
12-1pm Student Union Agave RoomSPAIN
Tuesday, September 23rd12-1pm Student Union Copper RoomUNITED KINGDOM & IRELAND
Thursday, September 25th12-1pm Student Union Agave Room
GREECE and TURKEYWednesday, November 19th
3-4pm Student Union Ventana Room
http://sustainability.arizona.edu/http://www.eebweb.arizona.edu/news/monday_seminar_new.asp
http://snr.arizona.edu/
02 October
at El Saguarito(Park and Mabel)
2nd
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There's only two days left to submit your Campus Ecology Fellowship application. Apply by Wednesday,October 1, 2008 for the opportunity to make your campus a better place, while building your resume.National Wildlife Federation's Campus Ecology program awards fellowship grants to undergraduate and graduate students who are committed to reduce their campus carbon footprint; projects including: greenhouse gas inventories, climate action plans, energy conservation and efficiency, habitat restoration, convening climate action gatherings and more will be considered.Grant awards:Up to $2,000 for Undergraduate StudentsUp to $5,000 for Graduate StudentsDeadline: October 1, 2008Next Deadline: November 15, 2008Visit www.nwf.org/fellows for details about the Campus Ecology Fellowship program.Sincerely,
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Q3 Recently, including yesterday evening, the president and other government officials have warned of impending economic crisis unless $700 billion of your tax dollars are quickly used to purchase "toxic debt". Do you believe conservation of biodiversity is best served by this $700 billion bailout, best served by not spending your tax dollars on this bailout, or best served by some alternative economic solution? Explain and justify. (Due by midnight Thurs 02 Oct as .DOC attachment to MJ ([email protected]) via email. Note that this is your last opportunity to turn in a “September” Assignment. See your syllabus for details.)
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Threats to Biodiversity
Habitat Lossdestruction, fragmentation, degradation
Global Climate ChangeOverexploitationInvasivesDisease
SYNERGY
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Extinction Risk…
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6th?
Extinction Risk…
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Extinction Risk…Extinct…
Extinct in the WildEcologically Extinct
Locally ExtinctExtirpated
Vulnerable, Threatened, ENDANGERED
(vs. Extant)
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9Van Dyke 2003
3 step loss of biodiversity (Rosenzweig)
1. Endemics2. Sink populations3. Stochasticity
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Modelling Extinction Risk
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Extinction Risk
Amphibians
1. Wetland Habitat2. Terrestrial Habitat
wood frog (Rana sylvatica)&
spotted salamander (Ambystoma maculatum)
Harper et al. 2008
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Extinction Risk
Clean Water Act
1. Connected?2. Navigable?
State Laws and Buffers= 30m in Massachusetts
Need 290m (salamander) or 1000m (frog)?
Harper et al. 2008
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Modelling Extinction RiskAll models are wrong, some models are useful.
Data!
Life History StagesLife TablesDemographicsHabitat needsHabitat qualityStochasticity (e.g., hydroperiod)
Harper et al. 2008
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Modelling Extinction Risk
Why only model females?Age of first reproduction?Life span?Clutch size?Fecundity?
Model Robustness(many iterations with different parameter values)
Harper et al. 2008
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Modelling Extinction Risk
All models are wrong, some models are useful.
Data!
-Density (& Carrying Capacity [K])-Ecology
(study of distribution and abundance of organisms)-Natural History
Harper et al. 2008
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ModellingExtinction Risk(20 years out)
Frog
Salamander
Harper et al. 2008
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Other Considerations/Conclusions
To maintain (95% probability over 20 years)salamander populations need 100-165m buffer (habitat size) and less than 5% decrease in adult mortality (habitat quality).
Frogs more reliant on immigration (and habitat!)
Harper et al. 2008
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Other Considerations/Conclusions
Metapopulations
Immigration/Extinction
Habitat Degradation vs. Loss
Need Habitat and Connectivity
Longer life-span relies on greater adult survivorship
Ecoystem Complexity, Links
Harper et al. 2008
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1- Island Biogeography
2- Metapopulations
3- Habitat Heterogeneity
4- Disturbance
5- Genetic Diversity (MVP, PVA, Small Populations)
Paradigms In Conservation
20Zug et al. 2001
Biogeographic Realms
Holarctic
Gondwana
(Pangaea)
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1. Island BiogeographyQuammen Excerpt from Song of the Dodo (p.52-55)
LyellWallaceDarwin
MacArthurWilson
Frogs vs. Birds
Oceanic vs. Continental
Size, Age, Distance
dispersal
succession
~equilibrium
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Tarbuck and Lutgens 1999
Dispersal
Vicariance
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23Pough et al. 2004
- Plate tectonics- Climate (glaciation, drought)- Sea level
Islands, especially Continental, affected by:
Connectivity
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VanDyke 2003
Equilibrium Theory of Island Biogeography
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Equilibrium Theory of Island Biogeography
•Habitat Fragmentation
•Reserve Design
•Predictions vs. Observations
•Missing Factors-Rescue Effect-Habitat Suitability-Sink vs. Source-Habitat Heterogeneity-Species Interactions
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27http://www.rit.edu/~rhrsbi/GalapagosPages/mockingbird.html
Adaptive Radiation
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Pough et al. 2004
Galapagos
Humboldt Current
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Daphne Major
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http://www.rit.edu/~rhrsbi/GalapagosPages/DarwinFinch.htm
l
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Fernandina
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HolarcticGondwana
Pangaea
Laurasia
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Alfred Wegener, winter 1912-1913
Crustal Plates moving 1-12 cm / year
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Plate Tectonics – not fully accepted until 1960s
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35Campbell 1993
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Pough et al. 2004
Wallace’s Line
Weber’s LineSulawesi
Sunda shelf Sahul Shelf
Alfred Russel Wallace(1823 - 1913)
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Pough et al. 2004
Dispersal Ability
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Pough et al. 2004
Dispersal Ability (Isolation by Distance)
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2. Metapopulation:
“Spatially disjunct groups of individuals with some demographic or genetic connection”
“largely independent yet interconnected by migration”
1. All local populations must be prone to extinction2. Persistence of entire population requires recolonization of individual sites.
(See p.193 in VanDyke text)
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Source
Sink
b vs. d
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Juggling Balls, Oranges, and Mites:
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Hydrothermal Vents Lowland Leopard Frogs(thanks to Don Swann)
Metapopulation:
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4 km
Distribution of Lowland Leopard Frogs in Rincon Mountains, 1996-2001
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Metapopulation Dynamics
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Chytrid Fungus
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3. Habitat Heterogeneity
Conserve Bigger Area?
Conserve More Diverse Habitats?
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4. Disturbances
-Endogenous-Exogenous
An SUV is seen covered by sand as residents walk to their homes to inspect the damage by hurricane Ivan Wednesday, Sept. 22, 2004 in Pensacola Beach, Fla. Beach residents were allowed to see their homes for the first time since the hurricane. (AP Photo/Alan Diaz)
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Habitat Heterogeneity and Disturbance
- Tree Fall in Forest- Fire- Beaver Dam on Stream
Climax Community vs. Shifting Mosaic
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Intermediate Disturbance Hypothesis
“supercompetitors”“succession reset”