Benthic community metabolism and microbial dynamics in the Gulf of Trieste (Northern Adriatic Sea)

Herndl, G. J.; Peduzzi, Peter; Fanuko, Neda

doi:10.3354/meps053169

Cited by 70 publications

(23 citation statements)

References 31 publications

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“…A strong relation between TOM and depth was also reported in a previous study carried out along the nearby coastline of Monte San Bartolo (Covazzi- Harriague and Bittoni 2003). These findings were in accordance with the frequently observed greater retention of sediment-bound organic matter and microorganisms in the finest sediments (Herndl et al 1989;Van Duyl and Kop 1994;Albertelli et al 1999;Covazzi Harriague et al 2006). Both the structure and abundance of meiofaunal and macrofaunal communities resulted as being significantly different between inshore and offshore stations, especially when the interaction of season was considered.…”

Section: Discussionsupporting

confidence: 77%

Benthic communities along a littoral of the Central Adriatic Sea (Italy)

et al. 2009

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Bacteria, meio-and macrofauna were investigated at different depths in a coastal area of the Central Adriatic Sea, yielding information about the composition and abundance of the benthic community. In particular, 14 nematode genera were recorded for the first time in the Upper Adriatic Sea. All communities resulted as being significantly different between inshore and offshore stations, especially when the season interaction was considered. Sediment grain size seemed to be the main natural variable, along with trophic resources, affecting the distribution and composition of these benthic components, whilst there was no clear evidence of competition for food sources and predatory pressure between the communities. Meiofauna appeared the most useful community for detecting disturbances and river influences. In particular, the lowest copepod abundance in the shallow waters seemed to be related to a greater anthropogenic disturbance inshore, whilst meiofaunal abundance and diversity together with the nematode maturity index suggest the influence of the Foglia and Metauro rivers and the small stream Arzilla.

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Section: Discussionsupporting

confidence: 77%

Benthic communities along a littoral of the Central Adriatic Sea (Italy)

et al. 2009

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“…Significance of bacteria in the seagrass system Bacterial densities in Prelo Bay were high when compared to other coastal areas (De Flaun & Mayer 1983, Meyer-Reil 1983, Montagna et al 1983, Herndl et al 1989, Delille et al 1990, Ferrara-Guerrero & Bianchi 1990, Amon & Herndl 1991, Albertelli et al 1992 and bacterial biomass was a significant fraction (on average 6.23 %) of the sedimentary organic carbon. This value appears to be similar to those reported for deep-sea sediments (on average 9.5 %; ) but high if compared to other areas of the Ligurian Sea (3.5%; Fabiano .…”

Section: Discussionmentioning

confidence: 99%

Seasonal and inter-annual variation of bacteria in a seagrass bed of the Mediterranean Sea: relationship with labile organic compounds and other environmental factors

Danovaro¹,

Fabiano²

1995

Aquat. Microb. Ecol.

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Seasonal and inter-annual variations in density and biomass of benthic bacteria were examined in the surface sediments of a Mediterranean seagrass bed [Posidonia oceanica (L.) Delile] in the Gulf of Marconi (northwestern Mediterranean Sea) from January 1990 to January 1992. Bacterial parameters were compared to changes in elemental (organic C and total N) and biochemical (lipids, proteins, carbohydrates) composition of sediment organic matter, as well as to photosynthetic pigments. Bacterial density and biomass were high and exhibited marked seasonal variations with highest values in late spring. Bacterial biomass was positively correlated with temperature and negatively correlated with chlorophyll a content. By contrast no correlations were found with the bulk of organic carbon or nitrogen. In the year-to-year comparison the seasonal patterns of bacterial density were similar. However, bacterial parameters showed significant inter-annual variations. Such changes may be related to different organic matter composition and availability or to competition with microphytobenthos for inorganic nutrient uptake. These data evidence that, whereas temperature might be the most important factors controlling bacterial seasonality, the qual~ty of organic matter (sedimentary protein content coupled to C/N values) may be an important factor for explaining the ~nter-annual variations.

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“…Other studies of sediment O2 uptake rates at similar latitudes have shown temperature variations with a Q,,, of 2 to 3 (Jsrgensen 1977, Kanneworff & Christensen 1986, Hall et al 1989, Herndl et al 1989). There was a significant increase in the diffusive 0, uptake, 345 to 504 pm01 m-, h-', in March-April 1988 in response to the settling of the spring phytoplankton bloom.…”

Section: Seasonal Dynamics Of Oxygenmentioning

confidence: 99%

Microelectrode studies of seasonal oxygen uptake in a coastal sediment: role of molecular diffusion

Rasmussen¹,

Jørgensen²

1992

Mar. Ecol. Prog. Ser.

337

260

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Oxygen uptake rates and microdistributions of 0, in sediment of Aarhus Bay, Denmark. were studied over a year. Oxygen uptake was determined in the laboratory by 3 methods: (a) total O2 uptake in closed cores, (b) O2 flux through the diffusive boundary layer and (c) O2 consumption within the oxic surface zone. The O2 consumption rates in the oxic surface layer, calculated from (b) and (C) using molecular diffusion coefficients of 02, closely agreed and accounted for 70 % of the total O2 uptake. The O2 uptake rates strongly depended on in situ O2 concentrations in the overlying seawater. which in the bay varied from 100 % air saturation during winter to 23 ' X, during summer. The potentially higher O2 respiration during the summer months was counteracted by a lower O2 concentration in the bottom water, which led to a small seasonal variation in 0, uptake. Depth of the oxic sediment zone reached 5.1 mm during winter, narrowed down rapidly to a few mm upon settling of a spring phytoplankton bloom, and was only 1.2 mm during summer. Modeling of O2 consumption from O2 microprofiles showed zero-order kinetics, i.e. constant 0, consumption rates throughout the oxic zone during winter. Enhanced O2 consumption was found at the oxic-anoxic interface during summer, presumably due to reducing solutes which diffused up from anoxic layers Sediment 0, uptake was impeded by 3 to 5 % during winter and by 12 to 16 "L during summer due to transport resistance through the 300 pm thick diffusive boundary layer. Results demonstrate the importance of the boundary layer for sediment O2 uptake and its regulation.

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Benthic community metabolism and microbial dynamics in the Gulf of Trieste (Northern Adriatic Sea)

Cited by 70 publications

References 31 publications

Benthic communities along a littoral of the Central Adriatic Sea (Italy)

Benthic communities along a littoral of the Central Adriatic Sea (Italy)

Seasonal and inter-annual variation of bacteria in a seagrass bed of the Mediterranean Sea: relationship with labile organic compounds and other environmental factors

Microelectrode studies of seasonal oxygen uptake in a coastal sediment: role of molecular diffusion

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