Phytoplankton community composition and biomass in the oligotrophic Gulf of Mexico

E Selph, Karen; Swalethorp, Rasmus; R Stukel, Michael; B Kelly, Thomas; N Knapp, Angela; Fleming, Kelsey; Hernandez, Tabitha; R Landry, Michael

doi:10.1093/plankt/fbab006

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i

Phytoplankton community composition and biomass in the oligotrophic Gulf of Mexico

2021
By E Selph, Karen ; Swalethorp, Rasmus ; R Stukel, Michael ; ...
Source: Journal of Plankton Research, 2021; fbab006

[PDF-1.81 MB]

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Journal Title:

Journal of Plankton Research
Personal Author:

E Selph, Karen ; Swalethorp, Rasmus ; R Stukel, Michael ; B Kelly, Thomas ; N Knapp, Angela ; ... More +

E Selph, Karen ; Swalethorp, Rasmus ; R Stukel, Michael ; B Kelly, Thomas ; N Knapp, Angela ; Fleming, Kelsey ; Hernandez, Tabitha ; R Landry, Michael Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; NMF (National Marine Fisheries Service) ; NOS (National Ocean Service) ; NCCOS (National Centers for Coastal Ocean Science) ; JIMAR (Joint Institute for Marine and Atmospheric Research)

OAR (Oceanic and Atmospheric Research) ; NMF (National Marine Fisheries Service) ; NOS (National Ocean Service) ; NCCOS (National Centers for Coastal Ocean Science) ; JIMAR (Joint Institute for Marine and Atmospheric Research) Less -
Description:

Biomass and composition of the phytoplankton community were investigated in the deep-water Gulf of Mexico (GoM) at the edges of Loop Current anticyclonic eddies during May 2017 and May 2018. Using flow cytometry, high-performance liquid chromatography pigments and microscopy, we found euphotic zone integrated chlorophyll a of ~10 mg m−2 and autotrophic carbon ranging from 463 to 1268 mg m−2, dominated by picoplankton (<2 μm cells). Phytoplankton assemblages were similar to the mean composition at the Bermuda Atlantic Time-series Study site, but differed from the Hawaii Ocean Times-series site. GoM phytoplankton biomass was ~2-fold higher at the deep chlorophyll maximum (DCM) relative to the mixed layer (ML). Prochlorococcus and prymnesiophytes were the dominant taxa throughout the euphotic zone; however, other eukaryotic taxa had significant biomass in the DCM. Shallower DCMs were correlated with more prymnesiophytes and prasinophytes (Type 3) and reduced Prochlorococcus. These trends in ML and DCM taxonomic composition likely reflect relative nutrient supply—with ML populations relying on remineralized ammonium as a nitrogen source, and the taxonomically diverse DCM populations using more nitrate. These spatially separated phytoplankton communities represent different pathways for primary production, with a dominance of picoplankton in the ML and more nano- and microplankton at the DCM.
Keywords:

[+]

Phytoplankton Prochloron Prymnesium
Source:

Journal of Plankton Research, 2021; fbab006
DOI:

https://doi.org/10.1093/plankt/fbab006
Document Type:

Journal Article
Funding:

Grant no. NA15OAR4320071 ; Grant no. NA16NMF4320058

Grant no. NA15OAR4320071 ; Grant no. NA16NMF4320058 Less -
Place as Subject:

Mexico, Gulf of
Rights Information:

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Submitted
Main Document Checksum:

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urn:sha256:a18129c2555d77a53134472fd7fadea52f282bee3a558d40772f3ee105c07d4b
Download URL:

https://repository.library.noaa.gov/view/noaa/34220/noaa_34220_DS1.pdf
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Phytoplankton community composition and biomass in the oligotrophic Gulf of Mexico

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