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

Highly replicated sampling reveals no diurnal vertical migration but stable species-specific vertical habitats in planktonic foraminifera
Highly replicated sampling reveals no diurnal vertical migration but stable species-specific vertical habitats in planktonic foraminifera
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.
0142-7873
127-141
Meilland, Julie
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Siccha, Michael
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Weinkauf, Manuel F G
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Jonkers, Lukas
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Morard, Raphael
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Baranowski, Ulrike
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Baumeister, Adrian
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Bertlich, Jacqueline
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Brummer, Geert-jan
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Debray, Paul
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Fritz-endres, Theresa
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Groeneveld, Jeroen
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Magerl, Leonard
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Munz, Philipp
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Rillo, Marina C.
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Schmidt, Christiane
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Takagi, Haruka
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Theara, Gurjit
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Kucera, Michal
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Meilland, Julie
ef0c3ebf-8970-452e-9520-9995e090dcc0
Siccha, Michael
a24d539b-2b4d-40a1-a07f-8687323a154a
Weinkauf, Manuel F G
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Jonkers, Lukas
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Morard, Raphael
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Baranowski, Ulrike
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Baumeister, Adrian
7b8ec94f-d6f0-49c4-ba73-83c1e07c91b3
Bertlich, Jacqueline
27126c8d-58f8-439c-acc5-1f19e7f4e841
Brummer, Geert-jan
a9357df3-e5b4-4678-92f9-e6ed537040a5
Debray, Paul
339fc581-5cfc-405a-9487-ba5a4455afcd
Fritz-endres, Theresa
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Groeneveld, Jeroen
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Magerl, Leonard
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Munz, Philipp
cd2adb0e-d01e-4ed1-a94b-5516ad43b996
Rillo, Marina C.
07ef3ed2-cf06-4d61-8c10-1acd1420ff43
Schmidt, Christiane
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Takagi, Haruka
15d23fd3-1e02-401c-87ee-5e261f8e54a6
Theara, Gurjit
f6c94769-ac20-4b51-8453-8cea2b0b644f
Kucera, Michal
60f5b0d0-b552-45f9-96c0-f4a7004643ba

Meilland, Julie, Siccha, Michael, Weinkauf, Manuel F G, Jonkers, Lukas, Morard, Raphael, Baranowski, Ulrike, Baumeister, Adrian, Bertlich, Jacqueline, Brummer, Geert-jan, Debray, Paul, Fritz-endres, Theresa, Groeneveld, Jeroen, Magerl, Leonard, Munz, Philipp, Rillo, Marina C., Schmidt, Christiane, Takagi, Haruka, Theara, Gurjit and Kucera, Michal (2019) Highly replicated sampling reveals no diurnal vertical migration but stable species-specific vertical habitats in planktonic foraminifera. Journal of Plankton Research, 41 (2), 127-141. (doi:10.1093/plankt/fbz002).

Record type: Article

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.

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Accepted/In Press date: 20 January 2019
e-pub ahead of print date: 25 February 2019
Published date: March 2019

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Local EPrints ID: 431411
URI: https://eprints.soton.ac.uk/id/eprint/431411
ISSN: 0142-7873
PURE UUID: 4423d06d-5957-438f-a84d-d280e1f32c3d

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Date deposited: 31 May 2019 16:30
Last modified: 31 May 2019 16:30

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Contributors

Author: Julie Meilland
Author: Michael Siccha
Author: Manuel F G Weinkauf
Author: Lukas Jonkers
Author: Raphael Morard
Author: Ulrike Baranowski
Author: Adrian Baumeister
Author: Jacqueline Bertlich
Author: Geert-jan Brummer
Author: Paul Debray
Author: Theresa Fritz-endres
Author: Jeroen Groeneveld
Author: Leonard Magerl
Author: Philipp Munz
Author: Marina C. Rillo
Author: Christiane Schmidt
Author: Haruka Takagi
Author: Gurjit Theara
Author: Michal Kucera

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