Microphytobenthic primary production as 14C uptake in sublittoral sediments of the Gulf of Trieste (northern Adriatic Sea): Methodological aspects and data analyses

Cibic, Tamara; Blasutto, Oriana; Burba, N.; Umani, Serena Fonda

doi:10.1016/j.ecss.2007.09.005

Cited by 24 publications

(12 citation statements)

References 43 publications

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“…After 45 min, carbon incorporation was stopped by adding 200 µL of HCl 5N (final HCl concentration 0.11N) (Cibic and Virgilio, 2010). Subsequently, samples were treated as described in detail by Cibic et al (2008). At each station, the highest GPP value obtained from the light gradient was used.…”

Section: Gross Primary Production (Gpp) Oxygen Consumption and Bentmentioning

confidence: 99%

“…GPP was estimated in the laboratory from 14 C-incubation of slurries (Cibic et al, 2008). At each station, 10 cm 3 of homogenized surface sediment was sucked up with a syringe, resuspended in 190 mL of overlying filtered seawater (0.2 µm filter) and inoculated with 20 µCi (0.74 MBq) of NaH 14 CO 3 (DHI, Denmark) (Steemann-Nielsen, 1952).…”

Section: Gross Primary Production (Gpp) Oxygen Consumption and Bentmentioning

confidence: 99%

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The Port of Trieste (Northern Adriatic Sea)—A Case Study of the “Ecosystem Approach to Management”

et al. 2017

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This study is a rare example of "the ecosystem approach to management" that has been carried out for the purpose of providing practical support to decision-makers in managing a Site of National Interest (SIN) where activities such as fishing, aquaculture and swimming are restricted. Benthic ecosystem functioning was assessed to verify whether it would be possible to exclude the less contaminated part from the SIN and its legislative constraints. At five macrosites subjected to diversified industrialization and anthropization, we evaluated the structural characteristics of the sediments, both heterotrophic and phototrophic communities, and the main processes of production, transformation and consumption of organic matter at seven stations, plus a reference site. Along the north-eastern boundary of the bay, the port, shipbuilding and iron foundry areas, characterized by high levels of contaminants, low macrozoobenthic diversity, major organic contents (up to 51.1 mgC g −1 ) and higher numbers of hydrocarbon degrading bacteria (up to 5,464 MPN g dry −1 ), differed significantly (R ANOSIM = 0.463, p = 2.9%) from the other areas (stations). Oxygen consumption (−15.22 ± 1.59 mgC m −2 ) prevailed over primary production and the trophic state was net heterotrophic. In contrast, on the other side of the harbor (residential area/center bay), contamination levels were below the legal limits and both the microalgal and macrobenthic communities displayed higher biodiversity. Higher macrofaunal abundances (up to 753 ± 174.7 ind.m −2 ), primary production rates (up to 58.60 ± 8.41 mgC m −2 ) and exoenzymatic activities were estimated. nMDS and SIMPROF analyses performed on benthic communities significantly separated the most contaminated stations from the other ones. Overall, by applying this holistic approach, a better environmental situation was highlighted along the southern boundary of the bay and according to these results this part of the bay could be excluded from the SIN. However, further sampling is required along a finer sampling grid in the less contaminated side of the port in order to confirm these first results. Our work is one of the first case studies where such an ecosystem approach has been applied to a port area, in order to provide practical support to decision-makers involved in the spatial planning of harbor zones.

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Section: Gross Primary Production (Gpp) Oxygen Consumption and Bentmentioning

confidence: 99%

Section: Gross Primary Production (Gpp) Oxygen Consumption and Bentmentioning

confidence: 99%

The Port of Trieste (Northern Adriatic Sea)—A Case Study of the “Ecosystem Approach to Management”

et al. 2017

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“…MPB is generally assumed not to be limited by nutrients resources, since it can obtain them from both the overlying water column and the sediment pore water pool, the latter often being considered an inexhaustible source of nutrients (Cibic et al. ). However, a dependence of the MPB activity on the availability of inorganic nutrients in the water column, such as nitrate and phosphate, has been previously found (Granéli and Sundbäck , Sundbäck et al.…”

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confidence: 99%

Water column dissolved silica concentration limits microphytobenthic primary production in intertidal sediments

Bohórquez

Calenti

García‐Robledo

et al. 2019

Journal of Phycology

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Primary production of microphytobenthos (MPB) contributes significantly to the total production in shallow coastal environments. MPB is a diverse community in which diatoms are usually the main microalgal group. Diatoms require N, P, and other nutrients as with other autotrophs, but in addition require silicate to create their outer cell wall. Therefore, dissolved silica (DSi) might be a potential limiting factor for benthic primary production in areas with reduced freshwater input. To test this hypothesis, a microcosm experiment was conducted using intact sediment cores collected from an intertidal mudflat in the Bay of Cádiz and supplied with increasing concentrations of DSi (0, 5, 10, 25, and 45 μmol · L−1). After 7 d of enrichment, we determined chlorophyll a and c (Chl a, c) contents, metabolic rates (Net [Pn] and Areal Gross [PgA] Production and Light [RL] and Dark [RD] Respiration), as well as fluxes of inorganic nutrients across the sediment‐water interface. Chl a and c contents increased significantly with respect to the initial conditions but no differences between treatments were found. Both Pn and PgA showed a saturating‐like pattern with silicate concentration, reaching maximum rates at a DSi concentration of 45 μmol · L−1. The addition of DSi also resulted in an increase of DSi and ammonium uptake by the sediment, which was significantly higher in light than in darkness. Our results clearly show that water column DSi concentrations have a direct impact on benthic primary production, also controlling other related processes such as inorganic nutrient fluxes.

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“…Samples were incubated in a thermostatic chamber at in situ temperature under a gradient of light intensities (20,30,50,100,200 ) and after 45 min, carbon incorporation was stopped by adding 200 μl of 5 N HCl (final HCl concentration: 0.11 N) (Cibic & Virgilio 2010). Subsequently, samples were treated as described in detail by Cibic et al (2008). PP s refers to data obtained at in situ light conditions, whereas PP p refers to the potential PP, i.e.…”

Section: Pp Of Mpbmentioning

confidence: 99%

Benthic ecosystem functioning in hydrocarbon and heavy-metal contaminated sediments of an Adriatic lagoon

Cibic¹,

Franzo²,

Celussi³

et al. 2012

Mar. Ecol. Prog. Ser.

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Sediment samples were collected in 4 sites along a salinity gradient (between 0.2 and 27.3) of the Aussa River (Marano Lagoon, northern Adriatic Sea, Italy) and a decreasing gradient of industrial contamination downstream (from Stn A1 to Stn A4) to assess how a riverine-lagoonal system responds to chemical contamination by applying an integrative measure of its benthic ecological properties. Benthic biodiversity (primary producers, meiofauna, macrofauna) along with other structural and functional parameters were related to contamination. Meiofaunal abundance varied between 176 ± 65 and ~4000 ind. 10 cm −2 downstream. The macrofaunal composition shifted from one composed exclusively of chironomid larvae to a typically lagoonal one. At Stn A1, the benthic microalgal abundance exceeded 500 000 cells cm −3 and seemed unaffected by contamination. In the freshwater-impacted site, primary production was one order of magnitude higher than in the more saline one (7.20 and 0.60 µg C cm −3 h −1, respectively). High organic carbon enrichment (65 mg C g dry −1) at Stn A2 probably caused the highest community respiration, estimated by O 2 microprofiles, along with the highest exoenzymatic activities (β-glucosidase, leucine aminopeptidase and lipase). The 4 investigated sites were well separated by principal component analysis along a decreasing gradient of organic load. An extremely active microbial community in the contaminated site ensured high production and degradation rates. Correct assessment of the benthic ecosystem functioning in polluted areas may represent a useful tool for transitional system management in order to plan environmental interventions in a rational way.

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Microphytobenthic primary production as 14C uptake in sublittoral sediments of the Gulf of Trieste (northern Adriatic Sea): Methodological aspects and data analyses

Cited by 24 publications

References 43 publications

The Port of Trieste (Northern Adriatic Sea)—A Case Study of the “Ecosystem Approach to Management”

The Port of Trieste (Northern Adriatic Sea)—A Case Study of the “Ecosystem Approach to Management”

Water column dissolved silica concentration limits microphytobenthic primary production in intertidal sediments

Benthic ecosystem functioning in hydrocarbon and heavy-metal contaminated sediments of an Adriatic lagoon

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