Media type: E-Article Title: Circulation of water as a main factor influencing the development of helmets in Daphnia cucullata Sars Contributor: Hrbáček, Jaroslav Published: Springer Science and Business Media LLC, 1959 Published in: Hydrobiologia, 13 (1959) 1-2, Seite 170-185 Language: English DOI: 10.1007/bf00046216 ISSN: 0018-8158; 1573-5117 Keywords: Aquatic Science Origination: Footnote: