Preliminary Data on DMS Concentration in Seawater Samples Collected from the La Spezia Gulf (Ligurian Sea)

Boniforti, R.; Emaldi, P.; Ferraroli, R.; Maspero, Matteo; Nair, R.R.; Novo, A.

doi:10.1007/978-94-017-1261-3_17

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…DMS concentrations measured in the less eutrophic Niel Bay, with an annual mean value of 20 nM, are closer to levels mentioned in the literature. However, these values are still higher than concentrations encountered in the global oceans (between 0.5 and 10 nM) (Kettle et al, 1999), in the Gulf of La Spezia and in the Venice Lagoon (around 16 nM) (Boniforti et al, 1993;Moret et al, 2000). At both sites, DMS concentrations were often lower than DMSP d concentrations.…”

Section: Discussionmentioning

confidence: 71%

Comparison of β-dimethylsulfoniopropionate (DMSP) levels in two mediterranean ecosystems with different trophic levels

et al. 2006

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β-dimethylsulfoniopropionate (DMSP) and dimethylsulfide (DMS) concentrations were recorded from September 1999 to September 2000 in two geographically close ecosystems, differently affected by eutrophication: the Little Bay of Toulon and the Niel Bay (N.W. Mediterranean Sea, France). Little Bay had higher nutrient levels ([NO 3 − ] max. = 30.3 μM; [PO 4 3− ] max. = 0.46 μM) and higher chlorophyll a concentrations ([chl a] mean = 2.4 μg/L) compared to Niel Bay ([NO 3 − ] max. = 19.7 μM; [PO 4 − ] max. = 0.17 μM; [chl a] mean = 0.4 μg/L). In the two sites, we measured dissolved (DMSP d b 0.2 μm) and particulate DMSP (DMSP p N 0.2 μm) concentrations. The DMSP p was particularly analysed in the 0.2-5, 5-90 and N90 μm fractions. In the eutrophicated Little Bay, DMSP d concentrations showed a clear seasonality with high values from January to March (124-148 nM). The temporal profile of the DMSP p concentrations was similar, peaking in February-March (38-59 nM). In the less eutrophic Niel Bay, DMSP p concentrations were much lower (6-9 nM in March-April), whereas DMSP d concentrations were relatively high (110-92 nM in February-March). DMS concentrations were elevated from the end of the winter to the spring in Little Bay, ranging from 3 nM in October to 134 nM in March. In the less eutrophic Niel Bay, lower DMS levels were observed, generally not exceeding 20 nM. Each particulate fraction (0.2-5; 5-90; N90 μm) contained less DMSP in Niel Bay than in Little Bay. At both sites, the 5-90 μm fraction made up most of the DMSP p . This 5-90 μm fraction consisted of microphytoplankton, principally Dinophyceae and Bacillariophyceae.The 5-90 μm biomass calculated from cell biovolumes, was more abundant in Little Bay where the bloom at the end of the winter (165 μg/L in March) occurred at the same time as the DMSP peaks. The estimated DMSP p to biomass ratio for the 5-90 μm fraction was always higher in Little Bay than in Niel Bay. This suggests that the high DMSP levels recorded in Little Bay were not only due to a large Dinophyceae presence in this ecosystem. Indeed, the peak of DMSP p to biomass ratio obtained from cell biovolumes (0.23 nmol/μg in March) was consistent with the proliferation of Alexandrium minutum. This Dinophyceae species may account for between 50% (2894 cells/L) and 63% (4914 cells/L) of the total phytoplankton abundance in the Little Bay of Toulon.

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Section: Discussionmentioning

confidence: 71%

Comparison of β-dimethylsulfoniopropionate (DMSP) levels in two mediterranean ecosystems with different trophic levels

et al. 2006

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“…In the channel between Palmaria and Tino Islands, the water flows mostly westward reaching a velocity of 80 cm S-' . Nutrient concentratlons are significantly higher inside the Gulf of La Spezia (Cattini et al 1992) than in the oligotrophic waters off the islands (Boniforti et al 1993).…”

Section: Methodsmentioning

confidence: 99%

Patterns of bioconstruction in the cheilostome bryozoan Schizoporella errata:the influence of hydrodynamics and associated biota

Cocito¹,

Ferdeghini²,

Morri³

et al. 2000

Mar. Ecol. Prog. Ser.

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In the region of La Spezia (Ligurian Sea, Italy), the bryozoan Schzoporella errata forms sizeable buildups, termed 'giant colonies' or 'compound colonies' by previous investigators. Buildups were encrusting (up to 40 cm wide) with flat or bumpy surfaces in an exposed site, and erect (more than 20 cm high) branching anastornosed structures in a semi-exposed and in a sheltered site. The buildup architecture was significantly different in the 3 sites, with hlgher vertical development and number of branches per dm2 in the sheltered site. The internal structure of the buildups was also different: densely packed, extensive laminated sheets developed in the sheltered site; loosely packed, concentric sheets alternating with small cavities filled with sediment and shells of associated organisms were found in the semi-exposed and exposed sites. Functional groups could be recognised among the biota associated with S. errata buildups. The constructional pattern was interpreted as resulting from both interactions with other organisms and hydrodynamic conditions. While in the exposed site S. errata showed no vertical growth, in the sheltered site soft-bodied erect organisms formed the frame around which S. errata deposited a multilayered structure, which eventually caused the death and disappearance of the immured organisms. Breakage of branch tips by episodic disturbance and repeated binding through a complex array of budding patterns by S. errata resulted in tall buildups which preserved no trace of the soft-bodied organisms. Because of the role they played, these may therefore be defined as 'ghost frame-builders'. KEY WORDS: Bryozoa. Bioconstruction. Growth forms. Hydrodynamics. Associated biota. Mediterranean Sea

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“…These data cor- respond to a group of representative cases selected among a larger data set constituting the first DMS and DMSPd measurements ever reported in such a broad area of the Mediterranean Sea (Simo et al unpubl.). Previous determinations of dimethylated sulfur in this region were mostly restricted to nearby coastal areas in the Ligurian Sea (Nguyen et al 1978, Belviso et al 1993, Boniforti et al 1993. DMS concentrations were locally highest at coastal sites where elevated inputs of continental-derived nutrients and organic matter occur, i.e.…”

Section: Dms Dmspd and Dmso Concentrations In Surface Seawatersmentioning

confidence: 99%

Occurrence and transformation of dissolved dimethyl sulfur species in stratified seawater (western Mediterranean Sea)

Simo¹,

Grimalt²,

Pedrós-Alió³

et al. 1995

Mar. Ecol. Prog. Ser.

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Dimethyl sulfide (DMS), dissolved dimethylsulfoniopropionate (DMSPd) and dimethylsulfoxide (DMSO) were measured in Mediterranean seawater. In the open surface waters of late spring to early summer, DMSO (18 nM) was the main methylated sulfur compound and dominated over DMS (1.7 nM) by 1 order of magnitude. Conversely, DMSPd occurred at lower concentrations (0.55 nM) than DMS. The higher abundance of DMS over DMSPd, the poor correlation between surface DMS and chlorophyll a, and microscopic examination of the algal populations suggest that DMS essentially originated from decompos~tion of the DMSP, generated in a late decay phase of the spring phytoplankton development. On the other hand, the vertical profile of the dissolved dimethyl sulfur species and the depth distribution of both biological DMS production and consumption rates point to the concurrence of the biogenic cycles of DMS and carbon. Thus, highest DMS production occurs near the subsurface chlorophyll maximum in coincidence with the water column layers of highest microbial heterotrophic activity. Finally, the high DMSO concentrations suggest that this species may act as a major nonvolatile dimethyl sulfur pool in these waters.

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Preliminary Data on DMS Concentration in Seawater Samples Collected from the La Spezia Gulf (Ligurian Sea)

Cited by 6 publications

References 10 publications

Comparison of β-dimethylsulfoniopropionate (DMSP) levels in two mediterranean ecosystems with different trophic levels

Comparison of β-dimethylsulfoniopropionate (DMSP) levels in two mediterranean ecosystems with different trophic levels

Patterns of bioconstruction in the cheilostome bryozoan Schizoporella errata:the influence of hydrodynamics and associated biota

Occurrence and transformation of dissolved dimethyl sulfur species in stratified seawater (western Mediterranean Sea)

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