title: Phytoplankton growth after a century of dormancy illuminates past resilience to catastrophic darkness.
abstract: Photosynthesis evolved in the oceans more than 3 billion years ago and has persisted throughout all major extinction events in Earth's history. The most recent of such events is linked to an abrupt collapse of primary production due to darkness following the Chicxulub asteroid impact 65.5 million years ago. Coastal phytoplankton groups (particularly dinoflagellates and diatoms) appear to have been resilient to this biotic crisis, but the reason for their high survival rates is still unknown. Here we show that the growth performance of dinoflagellate cells germinated from resting stages is unaffected by up to a century of dormancy. Our results clearly indicate that phytoplankton resting stages can endure periods of darkness far exceeding those estimated for the Cretaceous-Paleogene extinction and may effectively aid the rapid resurgence of primary production in coastal areas after events of prolonged photosynthesis shut-down.
authors.affiliation: Marine Biological Section, Department of Biology, Faculty of Science, University of Copenhagen, Øster Farimagsgade 2D, 1353 CPH-K, Denmark. sribeiro@bio.ku.dk
authors.forename: Sofia
authors.initials: S
authors.lastname: Ribeiro
authors.forename: Terje
authors.initials: T
authors.lastname: Berge
authors.forename: Nina
authors.initials: N
authors.lastname: Lundholm
authors.forename: Thorbjørn J
authors.initials: TJ
authors.lastname: Andersen
authors.forename: Fátima
authors.initials: F
authors.lastname: Abrantes
authors.forename: Marianne
authors.initials: M
authors.lastname: Ellegaard
mesh_terms: D005075:Biological Evolution; D003624:Darkness; D004141:Dinoflagellida / Q000235:genetics / Q000254:growth & development* / Q000502:physiology / Q000528:radiation effects*; D017753:Ecosystem; D008027:Light; D010839:Phytoplankton / Q000235:genetics / Q000254:growth & development* / Q000502:physiology / Q000528:radiation effects*