Assessing Phytoplankton Nutritional Status and Potential Impact of Wet Deposition in Seasonally Oligotrophic Waters of the Mid-Atlantic Bight

P. N. Sedwick, P. W. Bernhardt, M. R. Mulholland, R. G. Najjar, L. M. Blumen, B. M. Sohst, C. Sookhdeo, B. Widner

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

To assess phytoplankton nutritional status in seasonally oligotrophic waters of the southern Mid-Atlantic Bight, and the potential for rain to stimulate primary production in this region during summer, shipboard bioassay experiments were performed using natural seawater and phytoplankton collected north and south of the Gulf Stream. Bioassay treatments comprised iron, nitrate, iron + nitrate, iron + nitrate + phosphate, and rainwater. Phytoplankton growth was inferred from changes in chlorophyll a, inorganic nitrogen, and carbon-13 uptake, relative to unamended control treatments. Results indicated the greatest growth stimulation by iron + nitrate + phosphate, intermediate growth stimulation by rainwater, modest growth stimulation by nitrate and iron + nitrate, and no growth stimulation by iron. Based on these data and analysis of seawater and atmospheric samples, nitrogen was the proximate limiting nutrient, with a secondary limitation imposed by phosphorus. Our results imply that summer rain events increase new production in these waters by contributing nitrogen and phosphorus, with the availability of the latter setting the upper limit on rain-stimulated new production.

Original languageEnglish (US)
Pages (from-to)3203-3211
Number of pages9
JournalGeophysical Research Letters
Volume45
Issue number7
DOIs
StatePublished - Apr 16 2018

Fingerprint

phytoplankton
nutritional status
wet deposition
nitrates
nitrate
stimulation
iron
rain
water
bioassay
rainwater
nitrogen
summer
phosphorus
phosphates
phosphate
Gulf Stream
seawater
carbon 13
inorganic carbon

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Sedwick, P. N. ; Bernhardt, P. W. ; Mulholland, M. R. ; Najjar, R. G. ; Blumen, L. M. ; Sohst, B. M. ; Sookhdeo, C. ; Widner, B. / Assessing Phytoplankton Nutritional Status and Potential Impact of Wet Deposition in Seasonally Oligotrophic Waters of the Mid-Atlantic Bight. In: Geophysical Research Letters. 2018 ; Vol. 45, No. 7. pp. 3203-3211.
@article{d7c0f95d94374d9ea88a8180f58051c4,
title = "Assessing Phytoplankton Nutritional Status and Potential Impact of Wet Deposition in Seasonally Oligotrophic Waters of the Mid-Atlantic Bight",
abstract = "To assess phytoplankton nutritional status in seasonally oligotrophic waters of the southern Mid-Atlantic Bight, and the potential for rain to stimulate primary production in this region during summer, shipboard bioassay experiments were performed using natural seawater and phytoplankton collected north and south of the Gulf Stream. Bioassay treatments comprised iron, nitrate, iron + nitrate, iron + nitrate + phosphate, and rainwater. Phytoplankton growth was inferred from changes in chlorophyll a, inorganic nitrogen, and carbon-13 uptake, relative to unamended control treatments. Results indicated the greatest growth stimulation by iron + nitrate + phosphate, intermediate growth stimulation by rainwater, modest growth stimulation by nitrate and iron + nitrate, and no growth stimulation by iron. Based on these data and analysis of seawater and atmospheric samples, nitrogen was the proximate limiting nutrient, with a secondary limitation imposed by phosphorus. Our results imply that summer rain events increase new production in these waters by contributing nitrogen and phosphorus, with the availability of the latter setting the upper limit on rain-stimulated new production.",
author = "Sedwick, {P. N.} and Bernhardt, {P. W.} and Mulholland, {M. R.} and Najjar, {R. G.} and Blumen, {L. M.} and Sohst, {B. M.} and C. Sookhdeo and B. Widner",
year = "2018",
month = "4",
day = "16",
doi = "10.1002/2017GL075361",
language = "English (US)",
volume = "45",
pages = "3203--3211",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "7",

}

Assessing Phytoplankton Nutritional Status and Potential Impact of Wet Deposition in Seasonally Oligotrophic Waters of the Mid-Atlantic Bight. / Sedwick, P. N.; Bernhardt, P. W.; Mulholland, M. R.; Najjar, R. G.; Blumen, L. M.; Sohst, B. M.; Sookhdeo, C.; Widner, B.

In: Geophysical Research Letters, Vol. 45, No. 7, 16.04.2018, p. 3203-3211.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Assessing Phytoplankton Nutritional Status and Potential Impact of Wet Deposition in Seasonally Oligotrophic Waters of the Mid-Atlantic Bight

AU - Sedwick, P. N.

AU - Bernhardt, P. W.

AU - Mulholland, M. R.

AU - Najjar, R. G.

AU - Blumen, L. M.

AU - Sohst, B. M.

AU - Sookhdeo, C.

AU - Widner, B.

PY - 2018/4/16

Y1 - 2018/4/16

N2 - To assess phytoplankton nutritional status in seasonally oligotrophic waters of the southern Mid-Atlantic Bight, and the potential for rain to stimulate primary production in this region during summer, shipboard bioassay experiments were performed using natural seawater and phytoplankton collected north and south of the Gulf Stream. Bioassay treatments comprised iron, nitrate, iron + nitrate, iron + nitrate + phosphate, and rainwater. Phytoplankton growth was inferred from changes in chlorophyll a, inorganic nitrogen, and carbon-13 uptake, relative to unamended control treatments. Results indicated the greatest growth stimulation by iron + nitrate + phosphate, intermediate growth stimulation by rainwater, modest growth stimulation by nitrate and iron + nitrate, and no growth stimulation by iron. Based on these data and analysis of seawater and atmospheric samples, nitrogen was the proximate limiting nutrient, with a secondary limitation imposed by phosphorus. Our results imply that summer rain events increase new production in these waters by contributing nitrogen and phosphorus, with the availability of the latter setting the upper limit on rain-stimulated new production.

AB - To assess phytoplankton nutritional status in seasonally oligotrophic waters of the southern Mid-Atlantic Bight, and the potential for rain to stimulate primary production in this region during summer, shipboard bioassay experiments were performed using natural seawater and phytoplankton collected north and south of the Gulf Stream. Bioassay treatments comprised iron, nitrate, iron + nitrate, iron + nitrate + phosphate, and rainwater. Phytoplankton growth was inferred from changes in chlorophyll a, inorganic nitrogen, and carbon-13 uptake, relative to unamended control treatments. Results indicated the greatest growth stimulation by iron + nitrate + phosphate, intermediate growth stimulation by rainwater, modest growth stimulation by nitrate and iron + nitrate, and no growth stimulation by iron. Based on these data and analysis of seawater and atmospheric samples, nitrogen was the proximate limiting nutrient, with a secondary limitation imposed by phosphorus. Our results imply that summer rain events increase new production in these waters by contributing nitrogen and phosphorus, with the availability of the latter setting the upper limit on rain-stimulated new production.

UR - http://www.scopus.com/inward/record.url?scp=85044870767&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85044870767&partnerID=8YFLogxK

U2 - 10.1002/2017GL075361

DO - 10.1002/2017GL075361

M3 - Article

AN - SCOPUS:85044870767

VL - 45

SP - 3203

EP - 3211

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 7

ER -