Primary plankton production, respiration and nitrification in a shallow temperate estuary during summer

Iriarte, Arantza; Madariaga, Iosu; Diez-Garagarza, Felix; Revilla, Marta; Orive, Emma

doi:10.1016/s0022-0981(96)02672-x

Cited by 57 publications

(37 citation statements)

References 45 publications

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“…Although these studies report variable N:C ratios and concerns about the validity of using 1 fixed ratio in a fluctuating environment, many other studies continue to report nitrification rates in nitrogen units based on the 14 C method and converted with a ratio provided by those studies referred to above: e.g. Indrebo et al(1979), Joye et al (1999), , and de Bie et al (2002) used the N:C ratio of Billen (1976); Berounsky & Nixon (1990, Iriarte et al (1997) and Iriarte et al (1998) used the N:C ratio of Owens (1986);and Jiang & Bakken (1999a) used the ratio from Belser (1984).…”

Section: Discussionmentioning

confidence: 99%

Comparison of nitrifier activity versus growth in the Scheldt estuarya turbid, tidal estuary in northern Europe

Andersson¹,

Brion²,

Middelburg³

2006

Aquat. Microb. Ecol.

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Nitrifier activity and growth were measured in the Scheldt estuary over a salinity gradient. Measurements were made during all 4 seasons using 15 N enriched ammonium and 14 C labeled carbon incorporation. Established conversion ratios are often used to convert the growth of nitrifiers (measured as the incorporation of carbon) to nitrifying activity (i.e. oxidation of ammonium to nitrate). Our study demonstrated that the conversion of growth rates to nitrifying activity induces uncertainty because activity and growth of nitrifiers may be uncoupled. The C:N conversion ratio appears to be oxygen and temperature dependent. We advocate the use of 15 N stable isotope techniques to study nitrification: this technique measures the actual activity of nitrifiers without the disadvantages involved in using inhibitors, and thus allows light inhibition to be measured.

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Section: Discussionmentioning

confidence: 99%

Comparison of nitrifier activity versus growth in the Scheldt estuarya turbid, tidal estuary in northern Europe

Andersson¹,

Brion²,

Middelburg³

2006

Aquat. Microb. Ecol.

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“…Laws (1991) suggested a PQ of 1.1F0.1 for growth on ammonia and a PQ of 1.4F0.1 for growth on nitrate. However, apparent PQ's substantially higher than expected from considerations of the N source assimilated by phytoplankton have been frequently measured, for instance, Oviatt et al (1986) estimated PQ values as high as 5.0 and Iriarte et al (1996) obtained a mean PQ of 2.2. In this study, a somewhat more standard PQ value of 1.2 was used according to Vollenweider (1974), Geider andOsborne (1989) and Laws (1991).…”

Section: Discussionmentioning

confidence: 98%

The influence of incubation periods on photosynthesis–irradiance curves

Macedo

Duarte

Ferreira

2002

Journal of Experimental Marine Biology and Ecology

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In phytoplankton primary production studies, samples for the determination of photosynthesis versus irradiance relationship ( P -I) are usually incubated at several irradiance levels during a fixed time period, commonly 2 -4 h. However, it is not clear if the use of this fixed incubation time is appropriate to study the P -I relationship in any given ecosystem. The aim of this work was to study the influence of incubation time on the P -I relationship in natural phytoplankton populations from three different coastal ecosystems: an open coastal area, an estuary, and a coastal lagoon. Physical and chemical variables, phytoplankton biomass, species composition, and P -I curves were analysed. The results showed that, in the coastal area and in the estuary, P -I relationships were time dependent, whereas in the coastal lagoon different incubation periods produced the same P -I curve. An underestimation of daily primary production, ranging from 13% to 42.5%, was calculated when data from standard incubation times (2 -4 h) were used in ecosystems where P -I curves present a dynamic time-dependent behaviour. This work suggests that the response of the P -I curves to the incubation time varies with the characteristics of the ecosystem and is related to the light regime to which phytoplankton cells are adapted. D

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“…The both facts in terms of excessive ammonia could selectively inhibit NOB activities, leading to the lower potential and actual rates of the NO 2 − oxidation relative to those of the ammonia oxidation. In natural waters, nitrifying bacteria are inclined to be associated with suspended and settled particles, rather than free, unattached flotation in the water column (Lusby et al 1998;Stehr et al 1995;Iriarte et al 1996;de Bie et al 2002). Being particulate attached, the nitrifying bacteria not only had a longer residence time (Soetaert and Herman 1995;de Bie et al 2002) but also could be effectively protected against the attack of adverse environmental factors (Hagopian and Riley 1998), such as excessive ammonia.…”

Section: Discussionmentioning

confidence: 99%

Adverse Effects of Ammonia on Nitrification Process: the Case of Chinese Shallow Freshwater Lakes

Chen

Cao

Song

et al. 2009

Water Air Soil Pollut

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Nitrification is a process in which ammonia is oxidized to nitrite (NO 2 − ) that is further oxidized to nitrate (NO 3 − ). The relations between these two steps and ambient ammonia concentrations were studied in surface water of Chinese shallow lakes with different trophic status. For the oxidations of both ammonia and NO 2 − , more eutrophic lakes generally showed significantly higher potential and actual rates, which was linked with excessive ammonia concentrations. Additionally, both potential and actual rates for ammonia oxidation were higher than those for NO 2 − oxidation in the more eutrophic lakes, while in the lakes with lower trophic status, both potential and actual rates for ammonia oxidation were almost equivalent to those for NO 2 − oxidation. This can be explained by the excessive unionized ammonia (NH 3 ) concentration that inhibits nitrite-oxidizing bacteria in the more eutrophic lakes. The laboratory experiment with different ammonia concentrations, using the surface water in a eutrophic lake, showed that ammonia oxidation rates were proportional to the ammonia concentrations, but NO 2 − oxidation rates did not increase in parallel. Furthermore, NO 2 − oxidation was less associated with particles in natural water of the studied lakes. Without effective protection, it would be selectively inhibited by the excessive ammonia in hypereutrophic lakes, resulting in NO 2 − accumulation.Shortly, the increased concentrations of ammonia cause a misbalance between the NO 2 − -producing and the NO 2 − -consuming processes, thereby exacerbating the lake eutrophication.

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Primary plankton production, respiration and nitrification in a shallow temperate estuary during summer

Cited by 57 publications

References 45 publications

Comparison of nitrifier activity versus growth in the Scheldt estuarya turbid, tidal estuary in northern Europe

Comparison of nitrifier activity versus growth in the Scheldt estuarya turbid, tidal estuary in northern Europe

The influence of incubation periods on photosynthesis–irradiance curves

Adverse Effects of Ammonia on Nitrification Process: the Case of Chinese Shallow Freshwater Lakes

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Primary plankton production, respiration and nitrification in a shallow temperate estuary during summer

Cited by 57 publications

References 45 publications

Comparison of nitrifier activity versus growth in the Scheldt estuarya turbid, tidal estuary in northern Europe

Comparison of nitrifier activity versus growth in the Scheldt estuarya turbid, tidal estuary in northern Europe

The influence of incubation periods on photosynthesis–irradiance curves

Adverse Effects of Ammonia on Nitrification Process: the Case of Chinese Shallow Freshwater Lakes

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Comparison of nitrifier activity versus growth in the Scheldt estuarya turbid, tidal estuary in northern Europe

Comparison of nitrifier activity versus growth in the Scheldt estuarya turbid, tidal estuary in northern Europe