Inorganic nitrogen uptake kinetics and whole-plant nitrogen budget in the seagrass Zostera noltii

Alexandre, Ana; Silva, João; Bouma, Tjeerd J.; Santos, Rui

doi:10.1016/j.jembe.2011.03.008

Cited by 45 publications

(59 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This partitioning of DIN incorporation depending on the nutrient and the shoot vegetative module has been previously described for Z. marina (Short and McRoy, 1984;Pedersen and Borum, 1992;Hemminga et al, 1994) and other seagrass species (Lee and Dunton, 1999a;Hasegawa et al, 2005;Alexandre et al, 2011). In our study, the preference for NH 4 + over NO 3 − by leaves was reflected by the generally higher leaf V max , K m and α for NH 4 + than for NO 3 − .…”

Section: Din Acquisition By Z Marina In Sqbsupporting

confidence: 86%

“…3 for these plants. It is worth noticing that, as commonly observed in this type of studies (see Terrados and Williams 1997;Alexandre et al, 2011Alexandre et al, , 2013Villazán et al, 2013), in some experiments uptake rates did not reach saturation as predicted by the Michaelis-Menten model (Fig. 2).…”

Section: Experimental Uptake Kineticssupporting

confidence: 69%

“…4A, B). This uncommon response resulted from the higher values of leaf V max (40-102 μmol N g −1 DW h −1 ) and K m (50-210 μM) for NH 4 + observed in Z. marina in SQB, compared to those measured in other seagrasses, including Z. marina from other sites (Thursby and Harlin, 1982;Lee and Dunton, 1999a;Alexandre et al, 2011). Since NH 4 + pulses usually occur in SQB as a result of sediment resuspension (Hernández-Ayón et al, 2004), it is likely that eelgrass is adapted to exploit this valuable nutrient source.…”

Section: Din Acquisition By Z Marina In Sqbmentioning

confidence: 95%

“…6-9 mg L −1 and 7.9-8.1, respectively). Although belowground tissues of Z. marina are exposed to a mostly anoxic environment in SQB, rhizomes and roots in these experimental incubations were maintained in partially oxygenated seawater; however previous studies show no effects of rhizosphere oxygenation on the NH 4 + and NO 3 − uptake rates of leaves or belowground tissues (Alexandre et al, 2010(Alexandre et al, , 2011. One entire plant was incubated per chamber, and leaf biomass was 0.5-0.9 g DW in the upper compartment, whereas the belowground biomass in the lower compartment was 0.1-0.4 and 0.05-0.2 g DW for rhizomes and roots, respectively.…”

Section: Din Uptake Kineticsmentioning

confidence: 96%

“…However, the difference between V amb and N demand could also suggest that part of the assimilated nitrogen is not incorporated into the plant biomass (e.g. may be released as exudates of dissolved organic nitrogen-DON; Romero et al, 2006); alternatively, it could be indicative of an overestimation of DIN uptake derived from limitations inherent to our experimental conditions (Stapel et al, 1996;Alexandre et al, 2011). Nevertheless, the nitrogen content, %N, measured in plant tissues in February and June were generally above the value of 1.82% suggested by Duarte (1990) as the threshold level below which seagrasses could be N-limited.…”

Section: Din Acquisition By Z Marina In Sqbmentioning

confidence: 99%

See 4 more Smart Citations

Dissolved inorganic nitrogen uptake kinetics and δ15N of Zostera marina L. (eelgrass) in a coastal lagoon with oyster aquaculture and upwelling influence

Sandoval‐Gil

Camacho-Ibar

Ávila-López

et al. 2015

Journal of Experimental Marine Biology and Ecology

View full text Add to dashboard Cite

Section: Din Acquisition By Z Marina In Sqbsupporting

confidence: 86%

Section: Experimental Uptake Kineticssupporting

confidence: 69%

Section: Din Acquisition By Z Marina In Sqbmentioning

confidence: 95%

Section: Din Uptake Kineticsmentioning

confidence: 96%

Section: Din Acquisition By Z Marina In Sqbmentioning

confidence: 99%

See 3 more Smart Citations

Dissolved inorganic nitrogen uptake kinetics and δ15N of Zostera marina L. (eelgrass) in a coastal lagoon with oyster aquaculture and upwelling influence

Sandoval‐Gil

Camacho-Ibar

Ávila-López

et al. 2015

Journal of Experimental Marine Biology and Ecology

View full text Add to dashboard Cite

Dissolved organic nitrogen: A relevant, complementary source of nitrogen for the seagrass Zostera marina

Alexandre

Hill

Jones

et al. 2015

Limnology & Oceanography

Self Cite

View full text Add to dashboard Cite

Dissolved organic nitrogen (DON) forms a significant pool of bioavailable N in the water column (62%) and in sediments of Ria Formosa lagoon (53%). We assessed the uptake rates of inorganic and organic nitrogen and its interactions in the seagrass Zostera marina, and further explored the possibility of seagrasses to use complex organic substrates (peptides). Uptake rates by leaves and roots were quantified in choice-uptake experiments where plants were exposed to mixed N solutions containing both 15 N inorganic (ammonium 1 nitrate) and 13 C 15 N organic (alanine 1 trialanine) nitrogen at field-relevant concentrations, and compared with uptake rates

show abstract

Meadow trophic status regulates the nitrogen filter function of tropical seagrasses in seasonally eutrophic coastal waters

Thomsen

Herbeck

Viana

et al. 2023

Limnology & Oceanography

View full text Add to dashboard Cite

The nutrient filter function is an important ecosystem service of seagrass meadows that mitigates the consequences of coastal eutrophication. In northeast Hainan in China, large seagrass areas were lost due to chronic eutrophication induced by untreated pond aquaculture effluents. However, in adjacent areas, seagrasses could survive due to seasonal exposure (i.e., not chronic) to eutrophication only. In a way, the conditions in these areas represent a transitional environment which allows investigating the effect of eutrophication on seagrass performance and their nitrogen uptake capacity. We tested how a 4‐week in situ nutrient enrichment affected inorganic nitrogen uptake rates of a multispecies seagrass meadow in eutrophic and non‐eutrophic seasons, in light and in darkness. All species maintained nitrogen uptake in the dark and preferred ammonium over nitrate. In the eutrophic season, the seagrass leaf biomass and growth were lower resulting in a lower nitrogen filter capacity. Among the species present, Cymodocea rotundata and Cymodocea serrulata covered 48% and 45%, respectively, of their daily nitrogen demand for leaf growth through leaf uptake from the water column, while it was only 30% for Thalassia hemprichii, the last remaining species in meadows degraded by eutrophication, as deduced from previous studies. It indicates that a multispecies seagrass meadow has a higher nitrogen filter capacity than a monospecific T. hemprichii meadow. By reducing seagrass diversity and, hence, the nitrogen filter function, eutrophication triggers a self‐reinforcing process. Once the nitrogen filtering capacity of a seagrass meadow is exhausted, further eutrophication and seagrass loss are expected.

show abstract

Inorganic nitrogen uptake kinetics and whole-plant nitrogen budget in the seagrass Zostera noltii

Cited by 45 publications

References 20 publications

Dissolved inorganic nitrogen uptake kinetics and δ15N of Zostera marina L. (eelgrass) in a coastal lagoon with oyster aquaculture and upwelling influence

Dissolved inorganic nitrogen uptake kinetics and δ15N of Zostera marina L. (eelgrass) in a coastal lagoon with oyster aquaculture and upwelling influence

Dissolved organic nitrogen: A relevant, complementary source of nitrogen for the seagrass Zostera marina

Meadow trophic status regulates the nitrogen filter function of tropical seagrasses in seasonally eutrophic coastal waters

Contact Info

Product

Resources

About