1. Editorial: Understanding urban ecosystems: A new frontier for science and education

   • Charles H. Nilon
   • Alan R. Berkowitz
   • Karen S. Hollweg

   OriginalPaper Pages: 3 - 4

2. The seed bank of a restored tidal freshwater marsh in Washington, DC

   • Andrew H. Baldwin
   • Ellen F. Derico

   OriginalPaper Pages: 5 - 20

3. Occurrence of breeding bird species in urban parks: Effects of park structure and broad-scale variables

   • Jukka Jokimäki

   OriginalPaper Pages: 21 - 34

4. Modelling changes in dimensions, health status, and arboricultural implications for urban trees

   • J.C. Banks
   • C.L. Brack
   • R.N. James

   OriginalPaper Pages: 35 - 43

5. Structural elements as barriers against wear in urban woodlands

   • S. Lehvävirta

   OriginalPaper Pages: 45 - 56

6. Is there a need for a theory of urban ecology?

   • Jari Niemelä

   OriginalPaper Pages: 57 - 65