clarifying myths about caribbean cities and using vegetation for … · 2018-03-22 · reptiles)...
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Clarifying Myths About Caribbean Cities and Using Vegetation for
Making Them Adaptable and Resilient to Extreme Events
Ariel E. Lugo
USDA Forest Service
Contributions from Alonso Ramírez, Omar Pérez Reyes, Olga Ramos González, Sebastián
Martinuzzi, Thomas J. Brandeis, Gabriela Morales Nieves, and natural and social scientists
in San Juan ULTRA
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Carbon Sequestration
Air Pollution Removal
Avoided Energy Use
Avoided Emissions
Total
Bilio
ns
of US D
ollars
per
Yea
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Annual Economic Contribution of US Urban Forests
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Climatic data from PRISM and MODIS Global Evapotranspiration Project (MOD16). ORNL DAAC - NASA Global 1km Forest Canopy Height (Simard et al., 2011). Data summarized within 50 km radius from urban centers.
Periurban (50 km) forest height (m)
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1. Low Area of Vegetation
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1. Low Area of Vegetation 2. The Polluted River Had to be Depauperate in Species
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Actual Field Work
• Uncovered 120 taxa of aquatic organisms (fish [12 species], insects, crustaceans, other invertebrates, reptiles)
• High fish biomass • A rare sponge (Spongilla laba) • A shrimp species thought extinct
(Palaemon pandaliformis) but actually common in this river.
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1. Low Area of Vegetation 2. The Polluted River Had to be Depauperate in Species 3. The City is Biologically and Ecologically Homogenized
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Urban Forest Inventories for San Juan:
Brandeis et al. 2014
• In 6.34 ha sampled at random in 2011: 86 tree and shrub species
• In 6.68 ha sampled at random in 2001: 75 tree and shrub species
• Shannon-Wiener Diversity index of 3.277 and 3.101, respectively (not bad!)
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1936
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1952
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2010
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1. Low Area of Vegetation 2. The Polluted River Had to be Depauperate in Species 3. The City is Biologically and Ecologically Homogenized 4. Ecology Alone Can Solve the Flooding Problem
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1. Low Area of Vegetation 2. The Polluted River Had to be Depauperate in Species 3. The City is Biologically and Ecologically Homogenized 4. Ecology Alone Can Solve the Flooding Problem 5. The City is a Simple System
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A SOCIAL-ECOLOGICAL-TECHNOLOGICAL SYSTEM (SETS)
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Rising Sea Level
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Category and Unit Total Number
Percent Functioning
Banks (number of branches) 313 0
Containers (dispatched daily at ports) 1,400 0
Gasoline Stations (number) 1,100 40
Post Offices (number) 132 0
Pharmacies (number) 1045 0
Roads (miles) 5,073 8
Supermarkets (number tracked) 456 0
Telecommunication Antennas (number) 2,671 <10
Telecommunication Towers (number) 1,619 20
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0 10 20 30 40 50 60 70 80 90 100 110 120 130
Leve
l of Ser
vice
in P
erce
nt
Days Post-María
Cell Phone Potable Water Electric Power Gas Station
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How did Urban Forests do?
• Those trees that were planted in the wrong place perished.
• Urban forests experienced similar effects as rural forests and they recovered as fast.
• The city was hotter because of the loss of forest canopy and leaves.
• People recognized the importance of vegetation for water quality and advocated reforestation.
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Moving Forward: María Was An Experiment That Can Benefit
Other Countries
• Complex adaptive system’s thinking along the lines of SETS.
• A focus on learning.
• Increased participation.
• Inclusivity, connectivity, and transparency.
• Polycentric governance.
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Surprised by Deforestation
¿Questions?
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Generalized Surficial Geology (Webb and Gomez Gomez 1998)
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353
544
2291
1293
725
100 245
615
879 1001
546
69
0
500
1000
1500
2000
2500A
rea o
f C
over
(ha)
AllGreen
Forest
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Social-Ecological-Technological (SETS) Effects of María
• Changed the social, ecological and technological conditions under which systems had to function.
• Set organisms, institutions & organizations in motion.
• Reduced the connectivity among all subsystems, isolating their components and retarding recovery.
• Increased heterogeneity of conditions. • Induced creativity and innovation (legal and illegal). • Exposed social and technolgical weaknesses,
particularly governance. • Few weaknesses in forests.
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The Anthropocene Challenges Cities
• By exposing them to novel changing conditions.
• This includes extreme events such as heat islands, rising sea levels, intense rainfalls, long-lasting droughts, stronger hurricanes.
• Extreme events expose the weaknesses of our social-ecological and technological systems (SETS).
• They test our adaptability and resilience.