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Oxygenation of anoxic sediments triggers hatching of zooplankton eggs
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (Centre for Ecology and Evolution in Microbial model Systems (EEMiS))
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (Centre for Ecology and Evolution in Microbial model Systems (EEMiS))
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (Centre for Ecology and Evolution in Microbial model Systems (EEMiS))ORCID iD: 0000-0002-9622-3318
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (MPEA ; Zooplankton Ecology)ORCID iD: 0000-0002-3740-5998
2015 (English)In: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 282, no 1817, 20152025Article in journal (Refereed) Published
Abstract [en]

Many coastal marine systems have extensive areas with anoxic sediments and it is not well known how these conditions affect the benthic-pelagic coupling. Zooplankton lay their eggs in the pelagic zone, and some sink and lie dormant in the sediment, before hatched zooplankton return to the water column. In this study, we investigated how oxygenation of long-term anoxic sediments affects the hatching frequency of dormant zooplankton eggs. Anoxic sediments from the brackish Baltic Sea were sampled and incubated for 26 days with constant aeration whereby, the sediment surface and the overlying water were turned oxic. Newly hatched rotifers and copepod nauplii (juveniles) were observed after 5 and 8 days, respectively. Approximately 1.5 × 105 nauplii per m-2 emerged from sediment turned oxic compared to 0.02 × 105 m-2 from controls maintained anoxic. This study demonstrated that re-oxygenation of anoxic sediments activated a large pool of buried zooplankton eggs, strengthening the benthic-pelagic coupling of the system. Modelling of the studied anoxic zone suggested that a substantial part of the pelagic copepod population can derive from hatching of dormant eggs. We suggest that this process should be included in future studies to understand population dynamics and carbon flows in marine pelagic systems.

Place, publisher, year, edition, pages
2015. Vol. 282, no 1817, 20152025
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-46523DOI: 10.1098/rspb.2015.2025ISI: 000363485700018PubMedID: 26468249OAI: oai:DiVA.org:lnu-46523DiVA: diva2:857307
Available from: 2015-09-28 Created: 2015-09-28 Last updated: 2016-11-30Bibliographically approved

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