Water column particulate matter: A key contributor to phosphorus regeneration in a coastal eutrophic environment, the Chesapeake Bay

Li, Jiying; Reardon, Patrick N.; McKinley, James P.; Joshi, Sadhna; Bai, Yuge; Bear, Kristi; Jaisi, Deb P.

doi:10.1002/2016jg003572

Cited by 15 publications

(13 citation statements)

References 60 publications

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“…S2–S4 for all profiles for the entire sampling period). PolyP and TPP decreased with depth in the water column, indicating remineralization of organic P and polyP during particle settling 29 . The loss of polyP through particle settling and degrading, calculated as the difference between the surface and the bottom divided by the surface concentrations, averaged 53 ± 13% and 80 ± 13% at sites 9031 and 1001, respectively, higher than the loss of TPP estimated in range of 23 ± 13% and 50 ± 22%, respectively (Table S2; recycling efficiencies of TPP and polyP are significantly different (t-test, p < 0.001for both sites)).…”

Section: Resultsmentioning

confidence: 93%

Picoplankton accumulate and recycle polyphosphate to support high primary productivity in coastal Lake Ontario

Plouchart

Zastepa

et al. 2019

Sci Rep

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Phytoplankton can accumulate polyphosphate (polyP) to alleviate limitation of essential nutrient phosphorus (P). Yet polyP metabolisms in aquatic systems and their roles in P biogeochemical cycle remain elusive. Previously reported polyP enrichment in low-phosphorus oligotrophic marine waters contradicts the common view of polyP as a luxury P-storage molecule. Here, we show that in a P-rich eutrophic bay of Lake Ontario, planktonic polyP is controlled by multiple mechanisms and responds strongly to seasonal variations. Plankton accumulate polyP as P storage under high-P conditions via luxury uptake and use it under acute P stress. Low phosphorus also triggers enrichment of polyP that can be preferentially recycled to attenuate P lost. We discover that picoplankton, despite their low production rates, are responsible for the dynamic polyP metabolisms. Picoplankton store and liberate polyP to support the high primary productivity of blooming algae. PolyP mechanisms enable efficient P recycling on ecosystem and even larger scales.

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Section: Resultsmentioning

confidence: 93%

Picoplankton accumulate and recycle polyphosphate to support high primary productivity in coastal Lake Ontario

Plouchart

Zastepa

et al. 2019

Sci Rep

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“…One of the potential reasons for this variation could be the dominance of different sources or composition of particulates in upstream and downstream regions of the creek. Among P o species, phytate is a dominant compound in upstream and ditch sites but monoesters and diesters, reported to be major P o compounds in the Chesapeake Bay, , are most likely candidates in the mouth of the creek.…”

Section: Resultsmentioning

confidence: 99%

“…Questions on the ultimate fate of NaOH–P i and HNO 3 –P i pools after export from the East Creek watershed (to the Chesapeake Bay) and subsequent processes including deposition, remobilization, and remineralization is out of scope for the creek stretch studied. These processes, however, have been included in other recent studies. ,, The finding that these pools remained largely recalcitrant to biological cycling in the main channel is significant for two main reasons. First, their isotopic signatures can be utilized for source tracking since they fall out of the range of isotopic equilibrium.…”

Section: Resultsmentioning

confidence: 99%

“…These processes, however, have been included in other recent studies. 26,31,32 The finding that these pools remained largely recalcitrant to biological cycling in the main channel is significant for two main reasons. First, their isotopic signatures can be utilized for source tracking since they fall out of the range of isotopic equilibrium.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Stable Isotopes and Bayesian Modeling Methods of Tracking Sources and Differentiating Bioavailable and Recalcitrant Phosphorus Pools in Suspended Particulate Matter

Mingus

Liang

Massoudieh

et al. 2018

Environ. Sci. Technol.

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Understanding the sources of different phosphorus (P) pools and their bioavailability under imposed biogeochemical environments in a watershed is limited largely due to the lack of appropriate methods. In this research, phosphate oxygen isotope ratios and Bayesian modeling on fingerprinting elements were applied as two novel methods to identify sources and relative recalcitrancy of particulate P pools suspended in water in the continuum of sources from land to the mouth of a coastal estuary to the Chesapeake Bay. Comparative analyses of sizes, relative ratios, and oxygen isotope values of particulate P pools in the creek water suggested that the NaHCO 3 −P pool was bioavailable, whereas NaOH−P and HCl−P pools were recalcitrant during P transport along the creek. Agricultural field soil, streambank, and river bottom sediments were major sources of particulate P and their contributions varied significantly at the headwater and downstream regions of the creek. Bayesian modeling based on fingerprinting elements suggested that tides played a major role in forming particulate matter from estuarine sources at the creek mouth region and importing it upstream. These findings provide new insights into the origin and fate of particulate P and the fidelity of isotope and fingerprinting methods in source tracking of P in tidally influenced watersheds.

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“…Apparently, an important reason for that is the different composition of refractory and mobile fractions. Humic substances have a higher proportion of nitrogen; easily degradable "organic" fractions have a higher proportion of phosphorus (Nausch and Nausch, 2011), part of which, in oxic conditions, can be associated with iron-humic complexes as well as phosphates adsorbed on particles (e.g., Ylöstalo et al, 2016;Li et al, 2017). Unfortunately, the existing information on organic nutrients, especially on their degradability is rather fragmentary (e.g., Hoikkala et al, 2015;KnudsenLeerbeck et al, 2017;Seidel et al, 2017).…”

Section: Degradability Of Organic Nutrientsmentioning

confidence: 99%

Large-Scale Nutrient Dynamics in the Baltic Sea, 1970–2016

Savchuk

2018

Front. Mar. Sci.

120

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The Baltic Sea is one of the world's marine areas well-covered by both long-term observations and oceanographic studies. It is also a large coastal area in which eutrophication had already been recognized half a century ago. While the mechanisms of eutrophication are largely understood, several features are less recognized and sometimes neglected, including: (a) natural and anthropogenic North-South and East-West nutrient gradients within the drainage basin and marine ecosystems; (b) the compensatory potential of the interconnectivity between the Baltic Sea basins; (c) long nutrient residence times and high buffer capacity of the system, resulting in slow responses to nutrient load reductions. Particularly important is the interaction of (d) naturally occurring saltwater inflows sporadically ventilating deep water layers and (e) a partly man-made intensification of biological oxygen consumption. Resulting redox alterations of biogeochemical nitrogen and phosphorus cycles are locked in a "vicious circle" that promotes cyanobacterial nitrogen fixation, thereby hindering nitrogen load reduction and sustaining an elevated trophic state. This tight coupling of natural environmental variation and human impacts complicates both scientific studies and management recommendations. Our primary objective is to describe all these features and mechanisms with the best available data on nutrient loads, and unique estimates of the basin-wide nutrient pools. These data are presented as both long-term time series and empirical nutrient budgets. The analysis is supplemented by results of biogeochemical modeling. A second, more practical objective is to make these time series available to the community.

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Water column particulate matter: A key contributor to phosphorus regeneration in a coastal eutrophic environment, the Chesapeake Bay

Cited by 15 publications

References 60 publications

Picoplankton accumulate and recycle polyphosphate to support high primary productivity in coastal Lake Ontario

Picoplankton accumulate and recycle polyphosphate to support high primary productivity in coastal Lake Ontario

Stable Isotopes and Bayesian Modeling Methods of Tracking Sources and Differentiating Bioavailable and Recalcitrant Phosphorus Pools in Suspended Particulate Matter

Large-Scale Nutrient Dynamics in the Baltic Sea, 1970–2016

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