Crustacean zooplankton release copious amounts of dissolved organic matter as taurine in the ocean

Elisabeth L. Clifford, Dennis A Hansell, Marta M. Varela, Mar Nieto-Cid, Gerhard J. Herndl, Eva Sintes

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Taurine (Tau), an amino acid-like compound, is present in almost all marine metazoans including crustacean zooplankton. It plays an important physiological role in these organisms and is released into the ambient water throughout their life cycle. However, limited information is available on the release rates by marine organisms, the concentrations and turnover of Tau in the ocean. We determined dissolved free Tau concentrations throughout the water column and its release by abundant crustacean mesozooplankton at two open ocean sites (Gulf of Alaska and North Atlantic). At both locations, the concentrations of dissolved free Tau were in the low nM range (up to 15.7 nM) in epipelagic waters, declining sharply in the mesopelagic to about 0.2 nM and remaining fairly stable throughout the bathypelagic waters. Pacific amphipod-copepod assemblages exhibited lower dissolved free Tau release rates per unit biomass (0.8±0.4 μmol g-1 C-biomass h-1) than Atlantic copepods (ranging between 1.3±0.4 μmol g-1 C-biomass h-1 and 9.5±2.1 μmol g-1 C-biomass h-1), in agreement with the well-documented inverse relationship between biomass-normalized excretion rates and body size. Our results indicate that crustacean zooplankton might contribute significantly to the dissolved organic matter flux in marine ecosystems via dissolved free Tau release. Based on the release rates and assuming steady state dissolved free Tau concentrations, turnover times of dissolved free Tau range from 0.05 d to 2.3 d in the upper water column and are therefore similar to those of dissolved free amino acids. This rapid turnover indicates that dissolved free Tau is efficiently consumed in oceanic waters, most likely by heterotrophic bacteria.

Original languageEnglish (US)
JournalLimnology and Oceanography
DOIs
StateAccepted/In press - 2017

Fingerprint

taurine
dissolved organic matter
crustacean
zooplankton
Crustacea
oceans
biomass
ocean
turnover
amino acid
water column
water
open ocean
marine ecosystem
amphipod
excretion
Copepoda
body size
life cycle
Gulf of Alaska

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

Cite this

Crustacean zooplankton release copious amounts of dissolved organic matter as taurine in the ocean. / Clifford, Elisabeth L.; Hansell, Dennis A; Varela, Marta M.; Nieto-Cid, Mar; Herndl, Gerhard J.; Sintes, Eva.

In: Limnology and Oceanography, 2017.

Research output: Contribution to journalArticle

Clifford, Elisabeth L. ; Hansell, Dennis A ; Varela, Marta M. ; Nieto-Cid, Mar ; Herndl, Gerhard J. ; Sintes, Eva. / Crustacean zooplankton release copious amounts of dissolved organic matter as taurine in the ocean. In: Limnology and Oceanography. 2017.
@article{c890a4cb31e34648b9a1b7fb92846346,
title = "Crustacean zooplankton release copious amounts of dissolved organic matter as taurine in the ocean",
abstract = "Taurine (Tau), an amino acid-like compound, is present in almost all marine metazoans including crustacean zooplankton. It plays an important physiological role in these organisms and is released into the ambient water throughout their life cycle. However, limited information is available on the release rates by marine organisms, the concentrations and turnover of Tau in the ocean. We determined dissolved free Tau concentrations throughout the water column and its release by abundant crustacean mesozooplankton at two open ocean sites (Gulf of Alaska and North Atlantic). At both locations, the concentrations of dissolved free Tau were in the low nM range (up to 15.7 nM) in epipelagic waters, declining sharply in the mesopelagic to about 0.2 nM and remaining fairly stable throughout the bathypelagic waters. Pacific amphipod-copepod assemblages exhibited lower dissolved free Tau release rates per unit biomass (0.8±0.4 μmol g-1 C-biomass h-1) than Atlantic copepods (ranging between 1.3±0.4 μmol g-1 C-biomass h-1 and 9.5±2.1 μmol g-1 C-biomass h-1), in agreement with the well-documented inverse relationship between biomass-normalized excretion rates and body size. Our results indicate that crustacean zooplankton might contribute significantly to the dissolved organic matter flux in marine ecosystems via dissolved free Tau release. Based on the release rates and assuming steady state dissolved free Tau concentrations, turnover times of dissolved free Tau range from 0.05 d to 2.3 d in the upper water column and are therefore similar to those of dissolved free amino acids. This rapid turnover indicates that dissolved free Tau is efficiently consumed in oceanic waters, most likely by heterotrophic bacteria.",
author = "Clifford, {Elisabeth L.} and Hansell, {Dennis A} and Varela, {Marta M.} and Mar Nieto-Cid and Herndl, {Gerhard J.} and Eva Sintes",
year = "2017",
doi = "10.1002/lno.10603",
language = "English (US)",
journal = "Limnology and Oceanography",
issn = "0024-3590",
publisher = "American Society of Limnology and Oceanography Inc.",

}

TY - JOUR

T1 - Crustacean zooplankton release copious amounts of dissolved organic matter as taurine in the ocean

AU - Clifford, Elisabeth L.

AU - Hansell, Dennis A

AU - Varela, Marta M.

AU - Nieto-Cid, Mar

AU - Herndl, Gerhard J.

AU - Sintes, Eva

PY - 2017

Y1 - 2017

N2 - Taurine (Tau), an amino acid-like compound, is present in almost all marine metazoans including crustacean zooplankton. It plays an important physiological role in these organisms and is released into the ambient water throughout their life cycle. However, limited information is available on the release rates by marine organisms, the concentrations and turnover of Tau in the ocean. We determined dissolved free Tau concentrations throughout the water column and its release by abundant crustacean mesozooplankton at two open ocean sites (Gulf of Alaska and North Atlantic). At both locations, the concentrations of dissolved free Tau were in the low nM range (up to 15.7 nM) in epipelagic waters, declining sharply in the mesopelagic to about 0.2 nM and remaining fairly stable throughout the bathypelagic waters. Pacific amphipod-copepod assemblages exhibited lower dissolved free Tau release rates per unit biomass (0.8±0.4 μmol g-1 C-biomass h-1) than Atlantic copepods (ranging between 1.3±0.4 μmol g-1 C-biomass h-1 and 9.5±2.1 μmol g-1 C-biomass h-1), in agreement with the well-documented inverse relationship between biomass-normalized excretion rates and body size. Our results indicate that crustacean zooplankton might contribute significantly to the dissolved organic matter flux in marine ecosystems via dissolved free Tau release. Based on the release rates and assuming steady state dissolved free Tau concentrations, turnover times of dissolved free Tau range from 0.05 d to 2.3 d in the upper water column and are therefore similar to those of dissolved free amino acids. This rapid turnover indicates that dissolved free Tau is efficiently consumed in oceanic waters, most likely by heterotrophic bacteria.

AB - Taurine (Tau), an amino acid-like compound, is present in almost all marine metazoans including crustacean zooplankton. It plays an important physiological role in these organisms and is released into the ambient water throughout their life cycle. However, limited information is available on the release rates by marine organisms, the concentrations and turnover of Tau in the ocean. We determined dissolved free Tau concentrations throughout the water column and its release by abundant crustacean mesozooplankton at two open ocean sites (Gulf of Alaska and North Atlantic). At both locations, the concentrations of dissolved free Tau were in the low nM range (up to 15.7 nM) in epipelagic waters, declining sharply in the mesopelagic to about 0.2 nM and remaining fairly stable throughout the bathypelagic waters. Pacific amphipod-copepod assemblages exhibited lower dissolved free Tau release rates per unit biomass (0.8±0.4 μmol g-1 C-biomass h-1) than Atlantic copepods (ranging between 1.3±0.4 μmol g-1 C-biomass h-1 and 9.5±2.1 μmol g-1 C-biomass h-1), in agreement with the well-documented inverse relationship between biomass-normalized excretion rates and body size. Our results indicate that crustacean zooplankton might contribute significantly to the dissolved organic matter flux in marine ecosystems via dissolved free Tau release. Based on the release rates and assuming steady state dissolved free Tau concentrations, turnover times of dissolved free Tau range from 0.05 d to 2.3 d in the upper water column and are therefore similar to those of dissolved free amino acids. This rapid turnover indicates that dissolved free Tau is efficiently consumed in oceanic waters, most likely by heterotrophic bacteria.

UR - http://www.scopus.com/inward/record.url?scp=85021243730&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85021243730&partnerID=8YFLogxK

U2 - 10.1002/lno.10603

DO - 10.1002/lno.10603

M3 - Article

AN - SCOPUS:85021243730

JO - Limnology and Oceanography

JF - Limnology and Oceanography

SN - 0024-3590

ER -