Seasonal Fluctuations in the Nutritional Value of Particulate Organic Matter in A Lagoon

Pusceddu, Antonio; Serra, Emilio; Sanna, Ornella; Fabiano, M.

doi:10.1080/02757549608039099

Cited by 34 publications

(14 citation statements)

References 27 publications

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“…However, few differences were observed in comparison to seston loads reported in other south Mediterranean areas (Tucci et al, 1996). By contrast, POC and PON values were similar or lower than those reported in other Mediterranean lagoons (Pusceddu et al, 1996) but much higher than those reported in the open sea (Fabian0 et al, 1996). Principal component analysis highlighted the presence of two key descriptors (chemical/trophic as organic matter descriptors and chemical/physical factors-Tab.…”

Section: The Effects Of Wind and Vegetation Cover On Water Column Feacontrasting

confidence: 56%

“…Under these conditions, the ability of phytoplankton to use inorganic nutrients very rapidly may, in fact, allow for a high rate of growth, independently of the total biomass (Goldman, 1979). In this study, total suspended matter concentrations were lower when compared to other Mediterranean lagoons (Pusceddu et al, 1996) or shallow water environments which are both characterized by large water column mixing and sediment resuspension (such as in the northern Adriatic, Sorokin et al, 1996). However, few differences were observed in comparison to seston loads reported in other south Mediterranean areas (Tucci et al, 1996).…”

Section: The Effects Of Wind and Vegetation Cover On Water Column Feacontrasting

confidence: 45%

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Spatial and Temporal Changes of Suspended Matter in Relation to Wind and Vegetation Cover in A Mediterranean Shallow Coastal Environment

Sarà

Leonardi²,

Mazzola

1999

Chemistry and Ecology

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Seasonal and spatial changes in seston, (POC), particulate organic carbon, (PON) particulate organic nitrogen and chlorophyll-a concentrations were studied on a monthly basis in a Mediterranean shallow coastal area (Stagnone di Marsala, Western Sicily) in order to gather information on factors controlling particulate organic matter distribution and composition. Seston concentration and composition were connected to the main physicochemical and biological driving factors, such as temperature, salinity, dissolved oxygen, wind-speed and biomass of submerged vegetation. The Stagnone di Marsala is characterized by high temperatures with strong seasonality (range: 11 ~ 28"C), while values ranged from 33 to 45 salinity. Total suspended organic matter concentrations (by ignition loss) ranged from 2mgl-I (in summer) to 12mgl-' (in winter) and chlorophyll-a concentrations from0.02 to 2 pgl-'. Despitea low POC/PONratios (rangingfrom 5 to 1 I), the ratio of POC to chlorophyll (CHL-a) displayed very high values (annual average of 647). The data reported in this study, highlighting the oligotrophy of the Stagnone di Marsala area, indicate that the trophic state of the basin was controlled by different degrees of wind exposure (mean monthly wind velocity at exposed sites ranged between 4.2 and 6.7m s- ') and by gradients in vegetation cover. These two Factors induced clear changes in the concentration and composition of the suspended particles, but played a different role in exposed and sheltered areas. Exposed areas with limited vegetation were characterized by large resuspension processes and wide temperature and salinity fluctuations caused by wind induced turbulence. In these areas, autotrophic biomass (as chlorophyll-a), due to phytoplankton and/or re-suspended microphytobenthos, appeared to play an important 152 G. S A a et al.role in enhancing the quality of the organic particles. By contrast, in sheltered areas which were characterized by large amounts of plant detritus, the autotrophic biomass (mostly phytoplankton) was almost negligible and the availability of the suspended organic particles to consumers appeared to be dependent largely upon the bacterial ageing of vascular organic detritus.

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Section: The Effects Of Wind and Vegetation Cover On Water Column Feacontrasting

confidence: 56%

Section: The Effects Of Wind and Vegetation Cover On Water Column Feacontrasting

confidence: 45%

Spatial and Temporal Changes of Suspended Matter in Relation to Wind and Vegetation Cover in A Mediterranean Shallow Coastal Environment

Sarà

Leonardi²,

Mazzola

1999

Chemistry and Ecology

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“…Coastal lagoons are characterized by a large environmental variability occurring on different spatial and temporal scales both in the water column (Pusceddu et al, 1996(Pusceddu et al, , 1999Mistri et al, 2002) and sediments (Giordani et al, 1997;Lardicci et al, 1997;Viaroli et al, 2001). In addition, similarly to other coastal marine ecosystems, they are increasingly affected by nutrient and organic matter overenrichment, often as a direct (e.g.…”

Section: Introductionmentioning

confidence: 97%

Relationships Between Chemical Characteristics of Sediments and Macrofaunal Communities in the Cabras Lagoon (Western Mediterranean, Italy)

et al. 2005

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The Cabras lagoon is a large and shallow transitional system which periodically suffers from dystrophic events leading to massive losses of its biological resources. Excessive organic matter (OM) and sulphur compounds in sediments are often claimed to be major environmental co-factors triggering these events. However, still limited information is available on their relationships with benthic macrofaunal communities in coastal lagoons. In order to assess these relationships, we conducted monthly field investigations between 2001 and 2002, at three regularly-spaced stations set between the inlet and the mouth of the Cabras lagoon. Results showed reduced conditions of sediments, worsening during the warm season. This was consistent with very high OM contents, up to >20%, with annual means of 14-16%. Organic pollution-tolerant taxa, such as Tubificidae nc, Neanthes succinea and Polydora ciliata, dominated poor macrofaunal communities. Results of multivariate analysis indicated significant differences in both environmental variables and macrofaunal community structure and species composition between stations and through different periods. This study documented for the first time in a coastal lagoon that inorganic reduced sulphur pools (acid volatile sulphide and chromium reduced sulphur) of sediments are leading ('best-matchingÕ) environmental factors influencing the spatial and temporal distribution of macrofaunal abundance and biomass. We conclude that impoverished macrofaunal communities in the Cabras lagoon may show a slight recovery during winter-spring, but tend to regress to an early stage of faunal succession in late summer. We suggest that the combination of excessive amounts of sedimentary organic matter and high temperatures tends to lead to anoxic conditions especially in relatively deeper and more saline waters. These events may concur to periodic increase of production rates of toxic hydrogen sulphide in sediments, which rapidly diffuses to the water column with deleterious effects both on the benthic and pelagic components of the lagoon ecosystem.

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“…a river: Admiraal et al 1992, the eutrophic Bay of Biscay: Bode & Fernández 1992, a eutrophic lake: Søn-dergaard et al 1995). It was similar to an equally shallow lagoon at the coast of the Mediterranean Sea, where only 13% of energy was available through phytoplankton (Pusceddu et al 1996). Because other planktonic microorganisms contributed even less to total biomass, the 'non-organism' POM contributed 75% in the bodden chain, a value rarely observed (Simon et al 1990).…”

Section: Pom Composition In the Eutrophic Bodden Systemmentioning

confidence: 73%

Seston particles along a eutrophication gradient in coastal waters of the Southern Baltic Sea: Significance of detritus and transparent mucoid material

Schumann¹,

Rentsch²,

Görs³

et al. 2001

Mar. Ecol. Prog. Ser.

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Exposed to over 30 yr of continuous eutrophication, the Darß-Zingst bodden chain, a shallow tideless estuary accumulated large amounts of particulate organic matter (POM). We sampled along the eutrophication gradient throughout the vegetation period 1996, in order to assess POM properties. Besides parameters describing the chemical composition, such as C/N ratio, protein content and protein:carbohydrate ratio, particles were microscopically analysed. From the volumes of non-transparent, nucleic acid-containing (fluorescently labelled by propidium iodide) and organic particles (stained with DTAF), the percentages of detrital and transparent mucoid material were derived. Ten to 63% of particulate organic carbon (POC) in the bodden system consisted of carbon from bacteria, phytoplankton and protozoans. Of the total organic particle volume, up to 46% were microorganisms. Although detritus volume averaged 14%, maximum values of 68% could be determined. Most of the organic particle volume consisted to 64% of transparent mucoid matter, which is an important carbon compartment in material cycling (e.g. settling substrate). At higher POC concentrations the chemically unidentified material as well as the mucoid matter were quantitatively more important compared to the mesotrophic Baltic Sea station, where the portion of detritus (62% on average) was much higher. The microscopically derived quantification of detrital and mucoid matter provides additional information on the suitability of seston as settling substrate, its age, origin and physical properties. Since the riverine water input into the bodden system is small and its POC concentration lower compared to the bodden itself, most of the estuarine POM was obviously produced locally. Detritus from submersed macrophytes did not occur before the end of the vegetation period in October and thus cannot contribute significantly to the POM analysed in this study. The high amounts of POM in the bodden system probably originate mainly from pelagic primary production. The sedimentation of POM, its processing in and frequent resuspension from the several mm-thick flocculent sediment layers, seems to be the main source for the high amount of mucoid particles.

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Seasonal Fluctuations in the Nutritional Value of Particulate Organic Matter in A Lagoon

Cited by 34 publications

References 27 publications

Spatial and Temporal Changes of Suspended Matter in Relation to Wind and Vegetation Cover in A Mediterranean Shallow Coastal Environment

Spatial and Temporal Changes of Suspended Matter in Relation to Wind and Vegetation Cover in A Mediterranean Shallow Coastal Environment

Relationships Between Chemical Characteristics of Sediments and Macrofaunal Communities in the Cabras Lagoon (Western Mediterranean, Italy)

Seston particles along a eutrophication gradient in coastal waters of the Southern Baltic Sea: Significance of detritus and transparent mucoid material

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