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Impact of benthic algae on dissolved...

Tyler, Anna Christina.

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Impact of benthic algae on dissolved organic nitrogen in a temperate, coastal lagoon.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Impact of benthic algae on dissolved organic nitrogen in a temperate, coastal lagoon./
作者:	Tyler, Anna Christina.
面頁冊數:	237 p.
附註:	Adviser: Karen J. McGlathery.
Contained By:	Dissertation Abstracts International63-03B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3044887
ISBN:	0493587780

Impact of benthic algae on dissolved organic nitrogen in a temperate, coastal lagoon.
Tyler, Anna Christina.

Impact of benthic algae on dissolved organic nitrogen in a temperate, coastal lagoon. - 237 p.

Adviser: Karen J. McGlathery.

Thesis (Ph.D.)--University of Virginia, 2002.

Coastal lagoons are a common land-margin feature world-wide. The shallow nature of lagoons leads to substantial benthic-pelagic coupling and dominance by benthic autotrophs. Increased inputs of nitrogen (N) from coastal watersheds may cause nuisance macroalgal blooms. However, little is known about the dynamics of dissolved organic nitrogen (DON), an important component (50–95%) of the total dissolved N (TDN) pool. The objectives of this dissertation were to: (1) quantify benthic-pelagic fluxes of specific dissolved organic and inorganic N (DIN) compounds along an environmental gradient in Hog Island Bay, an algal-dominated lagoon at the Virginia Coast Reserve LTER site, (2) determine how uptake and release by benthic macro- and microalgae impacts DON cycling and (3) estimate the turnover and retention of N by macroalgae.

ISBN: 0493587780Subjects--Topical Terms:

545717
Biogeochemistry.

Impact of benthic algae on dissolved organic nitrogen in a temperate, coastal lagoon.
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245 1 0 $a Impact of benthic algae on dissolved organic nitrogen in a temperate, coastal lagoon.
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500 $a Adviser: Karen J. McGlathery.
500 $a Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1137.
502 $a Thesis (Ph.D.)--University of Virginia, 2002.
520 $a Coastal lagoons are a common land-margin feature world-wide. The shallow nature of lagoons leads to substantial benthic-pelagic coupling and dominance by benthic autotrophs. Increased inputs of nitrogen (N) from coastal watersheds may cause nuisance macroalgal blooms. However, little is known about the dynamics of dissolved organic nitrogen (DON), an important component (50–95%) of the total dissolved N (TDN) pool. The objectives of this dissertation were to: (1) quantify benthic-pelagic fluxes of specific dissolved organic and inorganic N (DIN) compounds along an environmental gradient in Hog Island Bay, an algal-dominated lagoon at the Virginia Coast Reserve LTER site, (2) determine how uptake and release by benthic macro- and microalgae impacts DON cycling and (3) estimate the turnover and retention of N by macroalgae.
520 $a Sediment-water column DON fluxes were highly variable but comparable to DIN fluxes; fluxes of individual compounds (urea and dissolved free and combined amino acids [DFAA, DCAA]) often proceeded concomitantly in different directions. Where sediment metabolism was net autotrophic due to microalgal activity, TDN fluxes, mostly comprised of DIN, urea and DFAA, were directed into the sediments. Heterotrophic sediments, particularly beneath macroalgal mats, were a net source of TDN, mostly as DIN. Isolated crashes of dense macroalgal mats resulted in an order of magnitude increase in DIN and DON release. When present, living macroalgae controlled benthic-pelagic coupling by intercepting DIN, urea and DFAA fluxes and releasing DON, mostly as DCAA. Separate estimates from <super>15</super>N isotope dilution field experiments showed that macroalgae release &sim;50% of total N uptake. <italic>Ulva lactuca</italic> took up DIN, urea and DFAA throughout the lagoon, but DON uptake was only important where DIN was low. In the laboratory, urea and AA uptake rates were consistently higher for <italic>U. lactuca</italic> than for <italic>Gracilaria tikvahiae </italic>. Uptake and <super>15</super>N and <super>13</super>C assimilation rates varied for individual amino acids, suggesting different uptake mechanisms. Overall, macroalgae act as a conduit whereby both organic and inorganic N are taken up, transformed, and re-released to the water column on short time scales (minutes-hours). Benthic algae thus clearly influence benthic-pelagic coupling and the retention of N moving across the land-sea interface.
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650 4 $a Biology, Ecology. $3 1017726
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