(IMAGE) Technical University of Munich (TUM) Caption The observations over a period of 200 years confirm the general trend of a decline in habitat specialist species despite the fact that these are the target of nature conservation measures. Credit Photo: TUM/ J. Habel Usage Restrictions Must use photo credit as indicated. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.