Media type: E-Article Title: Die relative Wirksamkeit von Zeitgebern Contributor: Hoffmann, Klaus imprint: Springer Science and Business Media LLC, 1969 Published in: Oecologia Language: German DOI: 10.1007/bf00416981 ISSN: 0029-8519; 1432-1939 Keywords: Ecology, Evolution, Behavior and Systematics Origination: Footnote: