Eutrophication, structure and dynamics of a marine coastal system: results of ten-year monitoring along the Emilia-Romagna coast (Northwest Adriatic Sea)

Vollenweider, Richard A.; Rinaldi, A.; Montanari, G.

doi:10.1016/b978-0-444-89990-3.50014-6

Cited by 75 publications

(57 citation statements)

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“…The effects of eutrophication on the coastal environment worldwide are well documented (Vollenweider et al 1992;Philip and Alan 2010). Nitrogen and phosphorous loading from point and nonpoint sources can altered the global biogeochemistry and the most common effect on aquatic environment are perceived as increased in primary production (Smith et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Assessment of trophic change and its probable impact on tropical estuarine environment (the Kodungallur-Azhikode estuary, India)

Jayachandran

Nandan

2011

Mitig Adapt Strateg Glob Change

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The cumulative effects of global change, including climate change, increased population density and domestic waste disposal, effluent discharges from industrial processes, agriculture and aquaculture will likely continue and increases the process of eutrophication in estuarine environments. Eutrophication is one of the leading causes of degraded water quality, water column hypoxia/anoxia, harmful algal bloom (HAB) and loss of habitat and species diversity in the estuarine environment. The present study attempts to characterize the trophic condition of coastal estuary using a simple tool; trophic index (TRIX) based on a linear combination of the log of four state variables with supplementary index Efficiency Coefficient (Eff. Coeff.) as a discriminating tool. Numerically, the index TRIX is scaled from 0 to10, covering a wide range of trophic conditions from oligotrophic to eutrophic. Study area Kodungallur-Azhikode Estuary (KAE) was comparatively shallow in nature with average depth of 3.6±0.2 m. Dissolve oxygen regime in the water column was ranged from 4.7±1.3 mgL Comparisons over different spatial and temporal scales in the KAE and study observed that, estuary experiencing high productivity by the influence of high degree of eutrophication; an annual average of 6.91 TRIX was noticed in the KAE and seasonal highest was observed during pre monsoon period (7.15) and lowest during post monsoon period (6.51). In the spatial scale station V showed high value 7.37 and comparatively low values in the station VI (6.93) and station VII (6.96) and which indicates eutrophication was predominant in land cover area with comparatively high water residence time. Eff. Coeff. values in the KAE ranges from −2.74 during monsoon period to the lowest of −1.98 in pre monsoon period. Present study revealed that trophic state of the estuary under severe stress and the restriction of autochthonous and allochthonous nutrient loading should be keystone in mitigate from eutrophication process.

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Section: Introductionmentioning

confidence: 99%

Assessment of trophic change and its probable impact on tropical estuarine environment (the Kodungallur-Azhikode estuary, India)

Jayachandran

Nandan

2011

Mitig Adapt Strateg Glob Change

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“…Blooms frequently occur, especially close to the Italian coast, due to the water circulation patterns, which confine the nutrient-enriched waters near the coast (Franco and Michelato, 1992;Zavatarelli et al, 1998). Blooms are produced by few species, such as the diatoms Skeletonema costatum, Thalassiosira decipiens, Chaetoceros spp., Pseudo-nitzschia delicatissima, and the dinoflagellates Glenodinium lenticula, Prorocentrum spp., Lingulodinium polyedrum, Scrippsiella trochoidea, Gymnodinium sp., Gonyaulax fragilis and Alexandrium tamarense (e.g., Boni et al, 1986;Vollenweider et al, 1992). Dinoflagellates are most abundant in JuneeJuly, once the spring bloom of diatoms has left relatively nutrient-poor conditions in the waters.…”

Section: Introductionmentioning

confidence: 99%

“…Few studies consider the analyses of organicwalled dinoflagellate cyst (dinocyst) assemblages in this area as tools to reconstruct primary productivity in the sediments (Sangiorgi et al, 2001). Nevertheless, dinocysts preserved in sediments are the remains of a conspicuous group of primary producers especially in this basin (Vollenweider et al, 1992) and they have shown to be good indicators of (paleo-)productivity changes not only in this basin (Sangiorgi and Donders, 2004), but also in other geographical settings (e.g., Dale et al, 1999;Matsuoka, 1999). Frustules of diatoms, which are the main primary producers, are easily dissolved in the water column or in the sediments (Pusˇkaric et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

“…Several authors (Vollenweider et al, 1992;Bernardi Aubry et al, 2004 for an overview) have studied phytoplankton distribution in the North Adriatic Sea. They show that the phytoplankton population is composed of hundreds of species, the majority of which are dinoflagellates, even if, as expected in nutrient-enriched systems, the community structure is dominated by diatoms over most of the year.…”

Section: Introductionmentioning

confidence: 99%

“…These rivers carry large amounts of nutrients and allochthonous organic matter to the sea (e.g., Bortoluzzi et al, 1984;Provini et al, 1992;Pettine et al, 1998). High primary productivity characterizes the area (e.g., Vollenweider et al, 1992;Penna et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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The distribution of sterols and organic-walled dinoflagellate cysts in surface sediments of the North-western Adriatic Sea (Italy)

Sangiorgi

Fabbri

Comandini

et al. 2005

Estuarine, Coastal and Shelf Science

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The distributions of sterols and organic-walled dinoflagellate cysts (dinocysts) in five NW Adriatic Sea surface sediment samples were investigated. Samples are representative of areas differently influenced by freshwater inputs, mainly coming from the Po River. All the investigated samples exhibit the same suite of principal sterols, with cholest-5-en-3b-ol (cholesterol), 4a,23,24-trimethyl-5a-cholest-22E-en-3b-ol (dinosterol), 24-ethylcholest-5-en-3b-ol (sitosterol) and 24-methylcholesta-5,22E-dien-3b-ol (brassicasterol or epibrassicasterol) displaying the highest concentrations and relative abundances. The distribution of sterols in the samples is not related to their distance from the coast and/or with the C/N ratios and suggests a prevalent input of marine, autochthonous organic matter in the surface sediments. In particular, the high abundance of dinosterol underlines the importance of dinoflagellate productivity in this area and its contribution to the organic matter in sediments. However, absolute and relative abundances of dinosterol do not follow the trend observed for dinocyst concentrations in the investigated samples, with the exception of Spiniferites spp. cysts and cysts produced by Gonyaulax species.

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Eutrophication of the Marine Environment

Ménesguen¹

2014

The Land‐Sea Interactions

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Eutrophication, structure and dynamics of a marine coastal system: results of ten-year monitoring along the Emilia-Romagna coast (Northwest Adriatic Sea)

Cited by 75 publications

References 4 publications

Assessment of trophic change and its probable impact on tropical estuarine environment (the Kodungallur-Azhikode estuary, India)

Assessment of trophic change and its probable impact on tropical estuarine environment (the Kodungallur-Azhikode estuary, India)

The distribution of sterols and organic-walled dinoflagellate cysts in surface sediments of the North-western Adriatic Sea (Italy)

Eutrophication of the Marine Environment

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