Principles of Urban Ecology Steward T.A. Pickett Cary Institute of Ecosystem Studies.

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Presentation transcript:

Principles of Urban Ecology Steward T.A. Pickett Cary Institute of Ecosystem Studies

What’s a principle?

Components of Theory Domain Assumptions Concepts Definitions Facts Confirmed generalizations Laws Models Translation modes Hypotheses Framework Pickett et al. 2007

Senses of “urban” Broad – inclusive Narrow – specific

Goal Framework Model building

Themes Components Form Change Functioning

Components of the system

P1 Cities are about people and ecosystems. –Human ecosystems

The Ecosystem Concept Sir Arthur G. Tansley ( )

P2 Cities have multiple and changing forms.

Central Business District Transitional zone: recent immigrants, deteriorating housing, factories, abandonment Working class zone: single family tenements Residential zone: single family homes with yards and garages Commuter zone: suburbs Burgess Model

Antoni 2001

P3 Cities are mosaics extending into surroundings.

Cadenasso

Patch dynamics Applies to cities Hierarchical Gradients and fields

Pickett, Cadenasso

Social processes

P4 Planned, opportunistic, incremental, incidental.

Components of change Urban design Urban planning Topography Ecology Social-cultural Economic

P5 Urban designs as experiments. Felson, Pickett (2005)

Jordan Cove, CT Control development Traditional BMP

P6 Social, economic, cultural processes influence biophysical processes.

Grove, Burch

P7 Social, cultural, economic complexity.

Components of social complexity Property regimes Households and individuals Social status Economic status Lifestyle grouping Social identity etc.

Perceive high value of parks Perceive low value of parks Troy et al.

IKONOS Image Vegetation Parcels PROW Vegetation PROW Vegetation Private Land Vegetation Private Land Vegetation Fine Scale Analysis Grove, Troy, O’Neil-Dunne

Biophysical functions

P8 Remnant soils, waters, vegetation.

Nitrogen retention SuburbanForestedAgriculture kg N ha -1 y Inputs Atmosphere8.7 Fertilizer TOTAL Outputs Streamflow Retention Mass Percent Groffman, Belt, Fisher

P9 Biodiversity multifaceted and present.

Mocking bird Mourning dove Catbird RobinGrackle Pigeon Warren, Nilon, Wolf

Methodological principles

P10 Study-specific definition of urban.

Phoenix, Arizona Ppt: ~180 mm/yr Watershed area = 12,000km 2 Study area = 6,400 km 2 Population growth 1950 = 300, > 3 million Baltimore, Maryland Ppt: ~ 1200 mm/yr Watershed area = 17,000 km 2 Study area = Population million

P11 Abstract urban gradients.

NY CT LI NYBG VCP PBP SWP CEC MRG MLP MSP MSF HSF New York City McDonnell et al 1990

P12 Human perception as links.

Pickett, Cadenasso (2008)

Practical principles

P13 Flux of water, and water infrastructure.

N. Law and L. Band

Water principle Sites of cities Urban design Future demands.

P14 Exotic species functions.

G. Brush et al. in prep

P15 City form and shared needs –Role of elites –Non-stationary roles –Non-overlapping agency –Environmental injustice.

Boone

P16 Utility of data requires continual dialog.

Review of the principles Human ecosystem Multiple forms Extensive spatial mosaics Intention, opportunity, incidental, constraint Design as experiment Role of social pattern and process Social complexity …

Retain remnant soils, waters, vegetation Biodiversity multifaceted, value Urban definitions various Abstract gradients of urbanization Human perceptions and actions Flux of water, water infrastructure Exotics and function City form: equity and control Application through dialog.

Conclusions Transdiciplinary concern Heterogeneous, changing subject Suggests emerging framework Open to new insights Context for specific tests.