Phytoplankton DON uptake
نویسنده
چکیده
DON as a source of bioavailable nitrogen for phytoplankton D. A. Bronk, J. H. See, P. Bradley, and L. Killberg Department of Physical Sciences, The College of William and Mary, Virginia Institute of Marine Science, P.O. Box 1346, Gloucester Point, VA 23062, USA Geo-Marine Inc., 550 East 15th Street, Plano, TX 75074, USA Received: 26 June 2006 – Accepted: 14 July 2006 – Published: 7 August 2006 Correspondence to: D. A. Bronk ([email protected])
منابع مشابه
Limnol. Oceanogr., 44(3), 1999, 573–585
15N tracer techniques were used to measure rates of NH and NO uptake, dissolved organic nitrogen (DON) 1 2 4 3 release resulting from both ammonium (NH ) and nitrate (NO ) uptake, and NH regeneration at discrete depths 1 2 1 4 3 4 throughout the euphotic zone in Monterey Bay, California, at a site, H3, outside the plume of direct upwelling influence. In March 1993, 94% of the inorganic nitrogen...
متن کاملDON as a source of bioavailable nitrogen for phytoplankton
Relative to inorganic nitrogen, concentrations of dissolved organic nitrogen (DON) are often high, even in regions believed to be nitrogen-limited. The persistence of these high concentrations led to the view that the DON pool was largely refractory and therefore unimportant to plankton nutrition. Any DON that was utilized was believed to fuel bacterial production. More recent work, however, in...
متن کاملUtilization of inorganic and organic nitrogen by bacteria in marine systems1
The relative contribution of various inorganic and organic forms of nitrogen to the nitrogen requirements of picoplankton was examined with 15N tracers. Size fractionation was used to measure uptake by < l-pm size microorganisms, and inhibitors of protein synthesis were used to separate procaryotic from eucaryotic nitrogen uptake, Picoplankton utilized mainly ammonium and amino acids and only n...
متن کاملQuantifying the production of dissolved organic nitrogen in headwater streams using 15N tracer additions
Most nitrogen (N) assimilation in lake and marine ecosystems is often subsequently released via autochthonous dissolved organic nitrogen (DON) production, but autochthonous DON production has yet to be quantified in flowing waters. We measured in-stream DON production following 24 h 15N-nitrate (NO{3 ) tracer additions in 36 headwater streams, a subset of sites from the second Lotic Intersite N...
متن کاملLimnol. Oceanogr., 44(6), 1999, 1477–1485
Access to bioavailable nitrogen often limits primary production in marine and freshwater ecosystems. Around 70% of nitrogen transported by rivers worldwide consists of dissolved organic nitrogen (DON), but its bioavailability has been poorly investigated. To assess the potential bacterial growth on DON, we developed a bioassay employing natural DON and bacterial inocula in medium manipulated to...
متن کامل