The University of Southampton
University of Southampton Institutional Repository

Diurnal variability in alkaline phosphatase activity and the potential role of zooplankton

Diurnal variability in alkaline phosphatase activity and the potential role of zooplankton
Diurnal variability in alkaline phosphatase activity and the potential role of zooplankton
Daily light–dark cycles drive the circadian rhythm of many ocean processes including photosynthesis, gene expression, and zooplankton diel vertical migration (DVM). In phosphate deplete surface ocean regions, microbes produce metalloenzymes, such as alkaline phosphatases (AP), to access dissolved organic phosphorus. Here, we provide novel evidence of diurnal variation in AP activity (APA) in the subtropical North Atlantic using two independent datasets, with APA being two‐ to three‐fold higher at night. We demonstrate that zooplankton are a source of AP and postulate that zooplankton DVM is a source of enhanced AP in the surface waters at night, with reduction or degradation of AP during the day. Our results challenge the current assumption that APA is linear over a 24‐h period. While future ocean scenarios predict intensification and expansion of oceanic phosphate limitation, our findings indicate a role for zooplankton in regenerating phosphate that is currently missing in conceptual and numerical models.
Alkaline Phosphatase, Zooplankton, North Atlantic
Davis, Clare E.
65fc2085-7fe4-4af4-b4de-32c06d98c8e7
Lohan, Maeve
6ca10597-2d0f-40e8-8e4f-7619dfac5088
Tuerena, Robyn E.
c555b076-1072-4702-94ba-2f4292ff032e
Cerdan Garcia, Elena
7171170a-2128-4369-87c3-cffddea2e414
Tagliabue, Alessandro
23ecb1dd-3cf4-46eb-b059-637a04f2439b
Woodward, Malcolm
e90435b9-a070-40a0-a2ef-89b35a7b7541
Mahaffey, Claire
6c868a01-2c9b-48b0-ae08-9ecf6b870032
Davis, Clare E.
65fc2085-7fe4-4af4-b4de-32c06d98c8e7
Lohan, Maeve
6ca10597-2d0f-40e8-8e4f-7619dfac5088
Tuerena, Robyn E.
c555b076-1072-4702-94ba-2f4292ff032e
Cerdan Garcia, Elena
7171170a-2128-4369-87c3-cffddea2e414
Tagliabue, Alessandro
23ecb1dd-3cf4-46eb-b059-637a04f2439b
Woodward, Malcolm
e90435b9-a070-40a0-a2ef-89b35a7b7541
Mahaffey, Claire
6c868a01-2c9b-48b0-ae08-9ecf6b870032

Davis, Clare E., Lohan, Maeve, Tuerena, Robyn E., Cerdan Garcia, Elena, Tagliabue, Alessandro, Woodward, Malcolm and Mahaffey, Claire (2019) Diurnal variability in alkaline phosphatase activity and the potential role of zooplankton. Limnology and Oceanography Letters. (doi:10.1002/lol2.10104).

Record type: Article

Abstract

Daily light–dark cycles drive the circadian rhythm of many ocean processes including photosynthesis, gene expression, and zooplankton diel vertical migration (DVM). In phosphate deplete surface ocean regions, microbes produce metalloenzymes, such as alkaline phosphatases (AP), to access dissolved organic phosphorus. Here, we provide novel evidence of diurnal variation in AP activity (APA) in the subtropical North Atlantic using two independent datasets, with APA being two‐ to three‐fold higher at night. We demonstrate that zooplankton are a source of AP and postulate that zooplankton DVM is a source of enhanced AP in the surface waters at night, with reduction or degradation of AP during the day. Our results challenge the current assumption that APA is linear over a 24‐h period. While future ocean scenarios predict intensification and expansion of oceanic phosphate limitation, our findings indicate a role for zooplankton in regenerating phosphate that is currently missing in conceptual and numerical models.

Text
Davis_et_al-2019-Limnology_and_Oceanography_Letters - Version of Record
Available under License Creative Commons Attribution.
Download (1MB)

More information

Accepted/In Press date: 11 February 2019
e-pub ahead of print date: 10 March 2019
Keywords: Alkaline Phosphatase, Zooplankton, North Atlantic

Identifiers

Local EPrints ID: 429878
URI: https://eprints.soton.ac.uk/id/eprint/429878
PURE UUID: d0fec334-8b27-430f-a670-bcd392ca90fe
ORCID for Elena Cerdan Garcia: ORCID iD orcid.org/0000-0002-0409-7722

Catalogue record

Date deposited: 08 Apr 2019 16:30
Last modified: 09 Apr 2019 00:26

Export record

Altmetrics

Contributors

Author: Clare E. Davis
Author: Maeve Lohan
Author: Robyn E. Tuerena
Author: Alessandro Tagliabue
Author: Malcolm Woodward
Author: Claire Mahaffey

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×