An assessment of the microbial contribution to aquatic dissolved organic nitrogen using amino acid enantiomeric ratios

Jones, Vera; Collins, Matthew J.; Penkman, Kirsty; Jaffé, Rudolf; Wolff, George A.

doi:10.1016/j.orggeochem.2004.11.008

Cited by 23 publications

(13 citation statements)

References 26 publications

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“…Enantiomeric (D vs. L) AA ratios have indicated that prokaryotes are a major source of DON in the ocean (e.g., McCarthy et al, 1998;Dittmar et al, 2001;Amon et al, 2001;Jones et al, 2005), while D/ L values are much lower in sinking particles (Dittmar et al, 2001). At the same time, d 13 C-AA patterns suggesting autotrophic source have been observed in UDOM at all depths for these same samples (McCarthy et al, 2004).…”

Section: Udom: Dtr Vs Rv In Dissolved Materialsmentioning

confidence: 59%

Amino acid nitrogen isotopic fractionation patterns as indicators of heterotrophy in plankton, particulate, and dissolved organic matter

McCarthy¹,

Benner²,

Lee³

et al. 2007

Geochimica et Cosmochimica Acta

213

262

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Section: Udom: Dtr Vs Rv In Dissolved Materialsmentioning

confidence: 59%

Amino acid nitrogen isotopic fractionation patterns as indicators of heterotrophy in plankton, particulate, and dissolved organic matter

McCarthy¹,

Benner²,

Lee³

et al. 2007

Geochimica et Cosmochimica Acta

213

262

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“…The very high %HAA-C and %HAA-N values at T10 may be attributed to the shift from N-poor vascular plant UDON to N-rich marine biomass (phytoplankton and seagrass) derived UDON. Jones et al (2005) also reported an increasing contribution of microbial-derived (peptidoglycan) HAA in UDON along a salinity gradient in the FCE by examining the D/L ratios of HAAs.…”

Section: Total Haa Compositionmentioning

confidence: 88%

Chemical characteristics of dissolved organic nitrogen in an oligotrophic subtropical coastal ecosystem

Maie

Parish

Watanabe

et al. 2006

Geochimica et Cosmochimica Acta

Self Cite

112

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“…Canal water flowing into freshwater marshes appears to contain primarily refractory DON (Lu et al, 2003), while these marshes themselves are a source of more labile [proteinaceous] DON (Lu et al, 2003;Jones et al, 2005;2006). However, it appears that most of the DON input to Everglades estuaries is relatively refractory (J. Boyer, Florida International Univ., unpubl.…”

Section: Nutrient and Dissolved Organic Matter (Dom) Dynamicsmentioning

confidence: 99%

A synthesis of long-term research by the Florida Coastal Everglades LTER Program

Childers

2006

Hydrobiologia

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This paper synthesizes research conducted during the first 5-6 years of the Florida Coastal Everglades Long-Term Ecological Research Program (FCE LTER). My objectives are to review our research to date, and to present a new central theme and conceptual approach for future research. Our research has focused on understanding how dissolved organic matter (DOM) from upstream oligotrophic marshes interacted with a marine source of the limiting nutrient, phosphorus (P), to control productivity in the oligohaline estuarine ecotone. We have been working along freshwater to marine transects in two drainage basins located in Everglades National Park (ENP). The Shark River Slough transect (SRS) has a direct connection to the Gulf of Mexico, providing this estuarine ecotone with a source of marine P. The oligohaline ecotone along our southern Everglades transect (TS/Ph), however, is separated from this marine P source by the Florida Bay estuary. We originally hypothesized an ecosystem productivity peak in the SRS ecotone, driven by the interaction of marine P and Everglades DOM, but no such productivity peak in the TS/Ph ecotone because of this lack of marine P. Our research to date has tended to show the opposite pattern, however, with many ecosystem components showing enhanced productivity in the TS/Ph ecotone, but not in the SRS ecotone. Water column P concentrations followed a similar pattern, with unexpectedly high P in the TS/Ph ecotone during the dry season. Our organic geochemical research has shown that Everglades DOM is more refractory than originally hypothesized. We have also begun to understand the importance of detrital organic matter production and transport to ecotone dynamics and as the base of aquatic food webs. Our future research will build on this substantial body of knowledge about these oligotrophic estuaries. We will direct our efforts more strongly on biophysical dynamics in the oligohaline ecotone regions. Specifically, we will be focusing on inputs to these regions from four primary water sources: freshwater Everglades runoff, net precipitation, marine inputs, and groundwater. We are hypothesizing that dry season groundwater inputs of P will be particularly important to TS/Ph ecotone dynamics because of longer water residence times in this area. Our organic geochemical, biogeochemical, and ecosystem energetics work will focus more strongly on the importance of detrital organics and will take advantage of a key Everglades Restoration project, scheduled for 2008 or 2009, that will increase freshwater inputs to our SRS transect only. Finally, we will also begin to investigate the human dimensions of restoration, and of a growing population in south Florida that will become increasingly dependent on the Everglades for critical ecosystem services (including fresh water) even as its growth presents challenges to Everglades sustainability.

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An assessment of the microbial contribution to aquatic dissolved organic nitrogen using amino acid enantiomeric ratios

Cited by 23 publications

References 26 publications

Amino acid nitrogen isotopic fractionation patterns as indicators of heterotrophy in plankton, particulate, and dissolved organic matter

Amino acid nitrogen isotopic fractionation patterns as indicators of heterotrophy in plankton, particulate, and dissolved organic matter

Chemical characteristics of dissolved organic nitrogen in an oligotrophic subtropical coastal ecosystem

A synthesis of long-term research by the Florida Coastal Everglades LTER Program

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