Macroalgae Mediation of Dissolved Organic Nitrogen Fluxes in a Temperate Coastal Lagoon

Tyler, Anna Christina; McGlathery, Karen J.; Anderson, Iris C.

doi:10.1006/ecss.2001.0801

Cited by 141 publications

(89 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Decomposing macroalgal mats contribute significant amounts of organic matter to the sediments (Trimmer et al 2000, Tyler et al 2003, and this temporarily increases nutrient retention in the sediments, although over a shorter time scale than for seagrasses. Tyler et al (2001) reported that dissolved N release rates from sediments following the collapse of a macroalgal bloom (650 g [dry weight] m -2 ) were sufficient to completely mineralize the macroalgal biomass within 2 wk. Burial and retention rates may even be reduced before a major shift in plant communities occurs.…”

Section: Fate Of Plant-bound Nutrientsmentioning

confidence: 99%

Eutrophication in shallow coastal bays and lagoons: the role of plants in the coastal filter

McGlathery

Sundbäck²,

Anderson³

2007

Mar. Ecol. Prog. Ser.

498

341

View full text Add to dashboard Cite

Section: Fate Of Plant-bound Nutrientsmentioning

confidence: 99%

Eutrophication in shallow coastal bays and lagoons: the role of plants in the coastal filter

McGlathery

Sundbäck²,

Anderson³

2007

Mar. Ecol. Prog. Ser.

498

341

View full text Add to dashboard Cite

“…Studies have shown that DON can be a significant pool of N in temperate estuarine systems (Gardner and Hanson 1979, Valiela and Teal 1979, Burdige and Martens 1988, Burdige and Zheng 1998, Tyler et al 2001, Guldberg et al 2002, Verity 2002; however, this pool is rarely quantified into its refractory and bioavailable fractions. DON is especially important since changes in land use, eutrophication, and coastal development have been related to increases in water column nutrients, with the greatest increases in the form of DON (Verity 2002).…”

Section: Don Assimilationmentioning

confidence: 99%

Nitrogen Uptake by Native and Invasive Temperate Coastal Macrophytes: Importance of Dissolved Organic Nitrogen

Mozdzer

Zieman

McGlathery

2010

Estuaries and Coasts

View full text Add to dashboard Cite

We investigated if the success of the invasive common reed Phragmites australis could be attributed to a competitive ability to use dissolved organic nitrogen (DON) when compared to the dominant macrophyte Spartina alterniflora in tidal wetlands. Short-term nutrient uptake experiments were performed in the laboratory on two genetic lineages of Phragmites (native and introduced to North America) and S. alterniflora. Our results provide the first evidence for direct assimilation of DON by temperate marsh plants and indicate that amino acids are assimilated intact by all plant types at similar rates. Both Phragmites lineages had significantly greater urea-N assimilation rates than S. alterniflora, and the affinity for dissolved inorganic nitrogen (DIN) species was the greatest in native Phragmites > introduced Phragmites > S. alterniflora. Field studies demonstrated uptake of both DON and DIN in similar proportion as those determined in the laboratory experiments. Based on these uptake rates, we estimate that DON has the potential to account for up to 47% of N demand for Phragmites plants, and up to 24% for S. alterniflora plants. Additionally, we suggest that differences in N uptake between native and introduced Phragmites lineages explain one mechanism for the success of the introduced type under increasingly eutrophic conditions.

show abstract

“…However, there is evidence that some forms of DON (amino acids, e.g. glycine, glutamic acid and urea) can be broken down by bacteria and macroalgae (Tyler et al 2001). Furthermore, Wiegner et al (2006) have also demonstrated that ∼23% of the DON in rivers in eastern USA is bio-available.…”

Section: Fluxes To the Gbr Lagoonmentioning

confidence: 99%

Flood water quality and marine sediment and nutrient loads from the Tully and Murray catchments in north Queensland, Australia

Wallace

Stewart

Hawdon

et al. 2009

Mar. Freshwater Res.

View full text Add to dashboard Cite

Abstract. Current estimates of sediment and nutrient loads from the Tully-Murray floodplain to the Great Barrier Reef lagoon are updated by taking explicit account of flood events. New estimates of flood discharge that include over-bank flows are combined with direct measurements of sediment and nutrient concentrations in flood waters to calculate the loads of sediment and nutrient delivered to the ocean during 13 floods that occurred between 2006 and 2008. Although absolute concentrations of sediment and nutrients were quite low, the large volume of water discharged during floods means that they make a large contribution (30-50%) to the marine load. By not accounting for flood flows correctly, previous estimates of the annual average discharge are 15% too low and annual loads of nitrogen and phosphorus are 47% and 32% too low respectively. However, because sediments may be source-limited, accounting for flood flows simply dilutes their concentration and the resulting annual average load is similar to that previously estimated. Flood waters also carry more dissolved organic nitrogen than dissolved inorganic nitrogen and this is the opposite of their concentrations in river water. Consequently, dissolved organic nitrogen loads to the ocean may be around twice those previously estimated from riverine data.

show abstract

Macroalgae Mediation of Dissolved Organic Nitrogen Fluxes in a Temperate Coastal Lagoon

Cited by 141 publications

References 62 publications

Eutrophication in shallow coastal bays and lagoons: the role of plants in the coastal filter

Eutrophication in shallow coastal bays and lagoons: the role of plants in the coastal filter

Nitrogen Uptake by Native and Invasive Temperate Coastal Macrophytes: Importance of Dissolved Organic Nitrogen

Flood water quality and marine sediment and nutrient loads from the Tully and Murray catchments in north Queensland, Australia

Contact Info

Product

Resources

About