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Title

Highly replicated sampling reveals no diurnal vertical migration but stable species-specific vertical habitats in planktonic Foraminifera

Authors
Meilland, Julie
Siccha, Michael
Jonkers, Lukas
Morard, Raphaël
Baranowski, Ulrike
Baumeister, Adrian
Bertlich, Jacqueline
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Published in Journal of Plankton Research. 2019, vol. 41, no. 2, p. 127-141
Abstract Diurnal vertical migration (DVM) is a widespread phenomenon in the upper ocean, but it remains unclear to what degree it also involves passively transported micro- and meso-zooplankton. These organisms are difficult to monitor by in situ sensing and observations from discrete samples are often inconclusive. Prime examples of such ambiguity are planktonic foraminifera, where contradictory evidence for DVM continues to cast doubt on the stability of species vertical habitats, which introduces uncertainties in geochemical proxy interpretation. To provide a robust answer, we carried out highly replicated randomized sampling with 41 vertically resolved plankton net hauls taken within 26 hours in a confined area of 400 km2 in the tropical North Atlantic, where DVM in larger plankton occurs. Manual enumeration of planktonic foraminifera cell density consistently reveals the highest total cell concentrations in the surface mixed layer (top 50 m) and analysis of cell density in seven individual species representing different shell sizes, life strategies and presumed depth habitats reveals consistent vertical habitats not changing over the 26 hours sampling period. These observations robustly reject the existence of DVM in planktonic foraminifera in a setting where DVM occurs in other organisms.
Keywords Planktonic ForaminiferaPatchinessVertical migrationEcology
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Research group Sedimentology, Biostratigraphy and Micropaleontology
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MEILLAND, Julie et al. Highly replicated sampling reveals no diurnal vertical migration but stable species-specific vertical habitats in planktonic Foraminifera. In: Journal of Plankton Research, 2019, vol. 41, n° 2, p. 127-141. doi: 10.1093/plankt/fbz002 https://archive-ouverte.unige.ch/unige:115794

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Deposited on : 2019-04-08

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