Gyrotactic phytoplankton in laminar and turbulent flows: A dynamical systems approach Massimo Cencini, Guido Boffetta, Matteo Borgnino and Filippo De Lillo Eur. Phys. J. E, 42 3 (2019) 31 Published online: 20 March 2019 DOI: 10.1140/epje/i2019-11792-0