Matches in SemOpenAlex for { <https://semopenalex.org/work/W2022691835> ?p ?o ?g. }
- W2022691835 endingPage "19" @default.
- W2022691835 startingPage "1" @default.
- W2022691835 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 224:1-19 (2001) - doi:10.3354/meps224001 Benthic metabolism and nutrient regeneration on the continental shelf of Eastern Massachusetts, USA Charles S. Hopkinson Jr.*, Anne E. Giblin, Jane Tucker The Ecosystems Center, Marine Biological Laboratory, Woods Hole, Massachusetts 02543, USA *E-mail: chopkins@mbl.edu ABSTRACT: Benthic metabolism and nutrient cycling were examined in depositional sediments of Broad Sound, Massachusetts Bay, Stellwagen Basin and Cape Cod Bay between 1990 and 1994 in water 16 to 76 m deep. Bottom water nitrate and dissolved oxygen concentrations were typically <10 µM and >70% of saturation. Sediment organic content was uniformly low at all sites ranging from 1.3 to 2.1% carbon and 0.1 to 0.3% nitrogen. Sediment chlorophyll a and phaeopigment concentrations averaged ca 2 and 15 ug cm-3 respectively. Porewater nutrients and sediment-to-water fluxes of O2, dissolved inorganic carbon (DIC), NH4+, NO2- + NO3-, urea, PO43-, N2O and dissolved silicon (DSi), were measured in cores from 4 stations, 4 to 6 times a year, for 2 yr, in order to examine seasonal and annual patterns. An additional 8 sites were examined over several years in late summer in order to examine spatial patterns. Average benthic community respiration ranged from 10.6 to 14.3 mmol O2 m-2 d-1or 12.1 to 29.8 mmol C m-2 d-1 . Within regions, respiration was highest in Broad Sound, followed by Massachusetts Bay, Cape Cod Bay and Stellwagen Basin. Sediments were sources of inorganic N. Annual average dissolved inorganic nitrogen (DIN) fluxes ranged from 0.5 to 1.8 mmol N m-2 d-1. For all stations, the flux of DIN was dominated by NH4+. The importance of NO3- fluxes relative to NH4+ increased with increasing depth. For example, in late summer the relative importance of NO3- fluxes increased from 0 to 44% of total DIN flux between Broad Sound (<24 m) and Stellwagen Basin (75 m). Fluxes of N2O and urea were always extremely small (<0.1% of DIN). Seasonal cycles, which in general tracked bottom-water temperature and phytoplankton sedimentation, were very strong for respiration (O2 and DIC) but not for fluxes of NO3-, urea, N2O, and PO43-. Annual variation in benthic respiration was ca 25%, similar to that for primary production. Inorganic nutrient fluxes often varied in excess of 100% between years. Sediment mixing or porewater advection is thought to contribute to high nutrient flux variability. C, N, and P flux stoichiometry deviated substantially from the Redfield ratios, suggesting strong phosphorus retention by sediments and large nitrogen removal via denitrification. DSi fluxes were relatively high, which we attribute to focusing of biogenic material in these depositional sediments. Denitrification exceeded total DIN flux, averaging 1.9 and 1.3 mmol N m-2 d-1 in Massachusetts Bay and Stellwagen Basin respectively. The percentage of remineralized N that was denitrified increased with increasing water depth (from 60 to 72% for 35 and 75 m water). Denitrification was supported almost exclusively by coupled nitrification and denitrification. The benthic community decomposed 12 to 22% of overlying water primary production but only provided 3 to 8% of the phytoplankton inorganic N requirement. KEY WORDS: Benthic metabolism · Benthic nutrient regeneration · Porewater nutrients · Denitrification · Cape Cod Bay · Gulf of Maine · Massachusetts Bay Full text in pdf format NextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 224. Online publication date: December 18, 2001 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2001 Inter-Research." @default.
- W2022691835 created "2016-06-24" @default.
- W2022691835 creator A5024409014 @default.
- W2022691835 creator A5029580927 @default.
- W2022691835 creator A5070641707 @default.
- W2022691835 date "2001-01-01" @default.
- W2022691835 modified "2023-10-13" @default.
- W2022691835 title "Benthic metabolism and nutrient regeneration on the continental shelf of Eastern Massachusetts, USA" @default.
- W2022691835 cites W132238745 @default.
- W2022691835 cites W1491619236 @default.
- W2022691835 cites W1525438857 @default.
- W2022691835 cites W1560861127 @default.
- W2022691835 cites W1576460556 @default.
- W2022691835 cites W1604309689 @default.
- W2022691835 cites W1840520335 @default.
- W2022691835 cites W1968652393 @default.
- W2022691835 cites W1972519647 @default.
- W2022691835 cites W1973501599 @default.
- W2022691835 cites W1973817031 @default.
- W2022691835 cites W1981067832 @default.
- W2022691835 cites W1986776254 @default.
- W2022691835 cites W1988209349 @default.
- W2022691835 cites W1991315594 @default.
- W2022691835 cites W1997155802 @default.
- W2022691835 cites W1997175326 @default.
- W2022691835 cites W1999740995 @default.
- W2022691835 cites W2003656598 @default.
- W2022691835 cites W2009460074 @default.
- W2022691835 cites W2013278565 @default.
- W2022691835 cites W2023126621 @default.
- W2022691835 cites W2027534364 @default.
- W2022691835 cites W2036613883 @default.
- W2022691835 cites W2037896054 @default.
- W2022691835 cites W2038445638 @default.
- W2022691835 cites W2046674379 @default.
- W2022691835 cites W2048013704 @default.
- W2022691835 cites W2050484163 @default.
- W2022691835 cites W2052609735 @default.
- W2022691835 cites W2053065602 @default.
- W2022691835 cites W2054607151 @default.
- W2022691835 cites W2054645658 @default.
- W2022691835 cites W2056036282 @default.
- W2022691835 cites W2068948322 @default.
- W2022691835 cites W2075435443 @default.
- W2022691835 cites W2077440397 @default.
- W2022691835 cites W2081329861 @default.
- W2022691835 cites W2081366882 @default.
- W2022691835 cites W2086152595 @default.
- W2022691835 cites W2087070363 @default.
- W2022691835 cites W2088750926 @default.
- W2022691835 cites W2098820984 @default.
- W2022691835 cites W2098915178 @default.
- W2022691835 cites W2099290206 @default.
- W2022691835 cites W2105961523 @default.
- W2022691835 cites W2120393286 @default.
- W2022691835 cites W2153161933 @default.
- W2022691835 cites W2508357169 @default.
- W2022691835 cites W2887736385 @default.
- W2022691835 cites W2911298789 @default.
- W2022691835 cites W3020841357 @default.
- W2022691835 cites W38928156 @default.
- W2022691835 cites W392563981 @default.
- W2022691835 cites W2096365814 @default.
- W2022691835 cites W2336543615 @default.
- W2022691835 doi "https://doi.org/10.3354/meps224001" @default.
- W2022691835 hasPublicationYear "2001" @default.
- W2022691835 type Work @default.
- W2022691835 sameAs 2022691835 @default.
- W2022691835 citedByCount "75" @default.
- W2022691835 countsByYear W20226918352012 @default.
- W2022691835 countsByYear W20226918352013 @default.
- W2022691835 countsByYear W20226918352014 @default.
- W2022691835 countsByYear W20226918352015 @default.
- W2022691835 countsByYear W20226918352016 @default.
- W2022691835 countsByYear W20226918352017 @default.
- W2022691835 countsByYear W20226918352019 @default.
- W2022691835 countsByYear W20226918352020 @default.
- W2022691835 countsByYear W20226918352021 @default.
- W2022691835 countsByYear W20226918352022 @default.
- W2022691835 countsByYear W20226918352023 @default.
- W2022691835 crossrefType "journal-article" @default.
- W2022691835 hasAuthorship W2022691835A5024409014 @default.
- W2022691835 hasAuthorship W2022691835A5029580927 @default.
- W2022691835 hasAuthorship W2022691835A5070641707 @default.
- W2022691835 hasBestOaLocation W20226918351 @default.
- W2022691835 hasConcept C110872660 @default.
- W2022691835 hasConcept C111368507 @default.
- W2022691835 hasConcept C115880899 @default.
- W2022691835 hasConcept C127313418 @default.
- W2022691835 hasConcept C142796444 @default.
- W2022691835 hasConcept C151730666 @default.
- W2022691835 hasConcept C164638232 @default.
- W2022691835 hasConcept C184751465 @default.
- W2022691835 hasConcept C18903297 @default.
- W2022691835 hasConcept C2776384668 @default.
- W2022691835 hasConcept C2816523 @default.
- W2022691835 hasConcept C39432304 @default.
- W2022691835 hasConcept C83042747 @default.