Urban ecological systems: scientific foundations and a decade of progress

Area of Science:

• Urban Ecology
• Environmental Science
• Ecosystem Studies

Background:

• Urban ecological studies have expanded significantly in recent decades.
• These studies examine cities, suburbs, and exurbs, with historical roots in the early to mid-20th century.

Purpose of the Study:

• To apply the state factor approach (climate, substrate, organisms, relief, time) to differentiate urban from non-urban areas.
• To identify heterogeneity within metropolitan areas and review key findings for each state factor.
• To note emerging
• urban syndromes
• and the utility of integrative tools like the human ecosystem framework and watersheds.

Main Methods:

• Utilizing the state factor approach to analyze urban environmental characteristics.
• Reviewing key findings related to climate, substrate, organisms, relief, and time in urban settings.
• Synthesizing information from land change science and ecological urban design.

Main Results:

• The state factor approach effectively differentiates urban from non-urban environments and reveals intra-metropolitan heterogeneity.
• Tentative "urban syndromes" are emerging for soils, streams, wildlife, and plants, alongside ecosystem function homogenization (e.g., soil organic carbon).
• Integrative tools like ecosystem approaches, human ecosystem frameworks, and watersheds are valuable for synthesizing multi-factor information.

Conclusions:

• Urban ecology is a growing field with established frameworks for analysis.
• Understanding the organismal component, including human social organization, is crucial for urban environmental actions.
• Despite advancements, pressing research needs remain in urban ecological studies.