GAIA is available online at www.ingentaconnect.com www.oekom.de | B 54649 | ISSN 0940-5550 | GAIAEA 17/S1,81–176 (2008) S1 | 2008 ÖKOLOGISCHE PERSPEKTIVEN FÜR WISSENSCHAFT UND GESELLSCHAFT ECOLOGICAL PERSPECTIVES FOR SCIENCE AND SOCIETY PROTECTED AREAS AND BIODIVERSITY CONSERVATION q SPECIAL ISSUE: r r