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Copepod nauplii use phosphorus from bacteria, creating a short circuit in the microbial loop
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.ORCID iD: 0000-0003-4738-9714
2019 (English)In: Ecology Letters, ISSN 1461-023X, E-ISSN 1461-0248Article in journal (Refereed) Epub ahead of print
Abstract [en]

In subtropical oceans phytoplankton carbon: phosphorus (C : P) ratios are high, and these ratios are predicted to increase further with rising ocean temperatures and stratification. Prey stoichiometry may pose a problem for copepod zooplankton nauplii, which have high phosphorus demands due to rapid growth. We hypothesised that nauplii meet this demand by consuming bacteria. Naupliar bacterial and phytoplankton carbon and phosphorus ingestion, assimilation and incorporation were traced using P-33 and C-14 radioisotopes. Bacterial carbon was incorporated four times less efficiently into biomass than phytoplankton carbon. In contrast, bacterial and phytoplankton phosphorus were incorporated at similar efficiencies, and bacteria could meet a substantial amount of naupliar phosphorus requirements. As parts of the ocean become more oligotrophic, bacteria could help sustain naupliar growth and survival under suboptimal stoichiometric conditions. Thus, nauplii may be a shortcut for phosphorus from the microbial loop to the classical food web.

Place, publisher, year, edition, pages
WILEY , 2019.
Keywords [en]
Carbon, ecological stoichiometry, food quality, marine, phytoplankton, subtropics
National Category
Microbiology
Identifiers
URN: urn:nbn:se:umu:diva-162336DOI: 10.1111/ele.13332ISI: 000478617300001PubMedID: 31270952OAI: oai:DiVA.org:umu-162336DiVA, id: diva2:1343296
Note

2019-08-16: Granskad /EJo

Available from: 2019-08-16 Created: 2019-08-16 Last updated: 2019-08-16

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Faithfull, Carolyn L.

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