Heterotrophic bacteria in the northern Adriatic Sea: seasonal changes and ectoenzyme profile

Zaccone, Renata; Caruso, Gabriella; Calı̀, C.

doi:10.1016/s0141-1136(02)00089-2

Cited by 67 publications

(58 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Aminopeptidase activity was more intense closer to the estuary, consistent with the spatial pattern of variation in colony counts. The parallel effect was not observed in β-glucosidase activity, an attribute less common to marine bacteria than aminopeptidase (Zaccone et al 2002). However, and similar our observations from the vicinity of the sewage outfall, there was a significant decrease in the coupling between β-glucosidase activity and glucose incorporation with increasing distance from the mouth of the estuary.…”

supporting

confidence: 81%

“…This can result from the combined effects of the direct discharge of heterotrophic bacteria and stimulation of the autochthonous community by the release of sewage-derived organic substrates. Aminopeptidase activity is usually closely related to bacterial abundance (Cunha et al 2000, Zaccone et al 2002. This activity has been reported to be largely unresponsive to some external effects, namely the influence of a fish farm effluent (Brown & Goulder 1999), but it can be inhibited by ammonia, nitrate or toxicants present in treated sewage (Montuelle & Vollat 1998).…”

Section: Spatial Patterns Of Bacterioplankton Abundance and Activitymentioning

confidence: 99%

See 1 more Smart Citation

Influence of an estuarine plume and marine sewage outfall on the dynamics of coastal bacterioplankton communities

Almeida¹

2006

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

Marine bacterioplankton in the coastal region off Aveiro (NW Portugal) develop under the influence of the plume of a mesotrophic estuarine system (Ria de Aveiro) and, more recently, under the influence of the discharges of a marine sewage outfall (S. Jacinto). In an attempt to compare the degree of disturbance introduced by these 2 features to the abundance of sewage bacteria and heterotrophic activity of natural bacterioplankton, water samples were collected at 10 offshore and nearshore locations. Rates of ectoenzymatic activity and monomer incorporation were determined as proxies for potential heterotrophic activity of natural bacterial communities. ATP and chl a concentrations were used as estimates of the total abundance of phytoplankton. Faecal coliforms and total colony counts were used as indicators of sewage bacteria contamination. However, ATP, chl a, faecal coliforms, total colony counts, aminopeptidase activity and the maximum rate of leucine incorporation (leucine Vm) correlated negatively with linear distance to the mouth of the estuary, establishing the estuarine plume as an importance source of disturbance. Chl a, aminopeptidase activity and total colony counts also correlated negatively with linear distance to the sewage outfall, but no significant impact on the concentration of faecal bacteria could be detected. Compliance with the European Union Bathing Water Directive 76/160/EEC was achieved in 97% of samples. The ratio between β-glucosidase activity (polymer degradation) and glucose incorporation (monomer uptake) increased as the distance from the mouth of the estuary and from the sewage outfall increased. This indicates that, in addition to inputs of bacteria and nutrients, changes in the quality of the available organic substrates and/or sewage-related toxic effects may impose a shift in the functioning of heterotrophic bacterioplankton communities in this costal area. KEY WORDS: Marine bacterioplankton · Marine outfall · Estuarine plume · Coastal ocean Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 44: [253][254][255][256][257][258][259][260][261][262] 2006 Ocean disposal is one of the most common strategies for eliminating wastewater a few kilometres from the coastline in order to relieve the anthropogenic pressure inside estuarine systems. However, outfall discharges of untreated or partially treated wastewater into the ocean have often been associated with contamination of the water and sediments by faecal bacteria (Edwards et al. 1988, Paul et al. 1997, Obiri-Danso & Jones 1999, Delille & Gleizon 2003, Hughes 2003, Hughes & Thompson 2004 and coliphages (Paul et al. 1997). From a different perspective, organic and inorganic substrates discharged through sewage outfall are also an issue of concern and involve wider spatial ranges. Their impacts are found to cause changes in the size and structure of phytoplankton communities (Soltan et al. 2001, Parnell 2003 and of soft sediment faunal assemblages (Morris & Keough 2002).Bacter...

show abstract

supporting

confidence: 81%

Section: Spatial Patterns Of Bacterioplankton Abundance and Activitymentioning

confidence: 99%

Influence of an estuarine plume and marine sewage outfall on the dynamics of coastal bacterioplankton communities

Almeida¹

2006

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

show abstract

“…A moderate negative correlation (r = -0.51) was found between the total dissolved oxygen (O2) and salinity, which means that the total oxygen content decreased slightly with increasing salinity [15].…”

Section: Discussionmentioning

confidence: 99%

Salinity and Physicochemical Water Parameters of the Lower Flow of Neretva River

Ivanković

Petrović

et al. 2017

e-GFOS

View full text Add to dashboard Cite

Abstract:The lower flow of the Neretva River (delta) covers approximately 20.000 hectares. This is a unique, humid Mediterranean area with a number of important and protected wetland habitats and is a ornithological, ichthyology, and botanical reserve. By measuring the physico-chemical parameters at 20 locations, the water quality was determined with special attention to the occurrence of salinity. Increasing salinity of the Neretva water was found, owing to inflow reduction groundwater of the river Trebišnjica and the uncontrolled deepening of the Neretva riverbed. During a one-year monitoring period, field tests were conducted of significant maritime impacts on water quality. The physical parameters were the measured temperature, conductivity, electrical resistance, salinity, chemical quantity of dissolved oxygen (expressed as a percentage, mg L-1), the oxygen pressure in water, and the pH value. The values of the above parameters were measured in the field with WTW multiparameter instruments.Keywords: the Neretva River; lower flow; salinity; water quality SALINITET I FIZIČKO-KEMIJSKI POKAZATELJI KVALITETE VODE DONJEG TOKA RIJEKE NERETVESažetak: Donji tok rijeke Neretve (delta) obuhvaća oko 20.000 hektara. To je jedinstveno vlažno mediteransko područje s brojnim važnim i zaštićenim močvarnim, ornitološkim, ihtiološkim i botaničkim rezervatima. Mjerenjem fizičko-kemijskih pokazatelja kvalitete vode na 20 lokacija, posebna pozornost dana je pojavi povišenog saliniteta. Porast saliniteta u neretvanskom bazenu uzrokovan je smanjenim dotokom podzemnih voda rijeke Trebišnjice i nekontroliranim produbljivanjem korita rijeke Neretve. Tijekom jednogodišnjeg monitoringa izvedena su terenska mjerenja važnog maritimnog utjecaja na kvalitetu vode. Mjereni su fizički pokazatelji -temperatura, električna vodljivost, električna otpornost i salinitet, a od kemijskih -količina otopljenog kisika izražena kao %, mg L-1 i tlak otopljenog kisika u vodi te pH vrijednost. Mjerenja su izvedena na terenu s kombiniranim WTW višeparametarskim instrumentima.

show abstract

“…Bacteria associated with the marine sponge Haliclona sp have also been reported producing phosphatase enzyme [24]. Zaccone [25] opinioned that bacteria play a key role in the P cycle and that phosphatase was widespread in marine bacteria. Some bacteria associated with D. granulosa were found to produce urease enzyme in our study.…”

Section: Discussionmentioning

confidence: 99%

Sponge-associated bacteria of Lakshadweep coral reefs, India: resource for extracellular hydrolytic enzymes

Feby¹,

Nair²

2010

ABB

View full text Add to dashboard Cite

Sponges (Phylum: Porifera) is one of the major groups in the Lakshadweep coral reefs. These sponges harbor diverse bacteria with metabolic potentiality. From biodiversity to biotechnological prospecting, scientific investigations related to sponge associated microorganisms have expanded, but remain rather limited to few geographic locations. In this study, culturable bacteria associated with two demosponges viz Dysidea granulosa, Sigmadocia fibulata and the ambient water were screened for commercially important enzymes such as amylase, protease, gelatinase, lipase, deoxyribonucleic, phosphatase and urease. Amylase and phosphatase were the predominant enzymes produced by >80% of sponge-associated bacteria compared to the ambient water. Nearly 50% of the sponge-associated bacteria expressed multiple enzymatic activities (> 4) with variation in the percentage of expression of individual enzymes. More than 65% of the culturable heterotrophic bacteria associated with sponges were Gammaproteobacteria. The order Vibrionales was the main source for multiple enzyme production. Sponge associated bacteria formed more closely related clusters than the water isolates based upon their activity pattern. High recovery of sponge-associated bacteria with multiple enzymatic activities suggest that these versatile bacteria are yet unexploited potential for bioprospecting.

show abstract

Heterotrophic bacteria in the northern Adriatic Sea: seasonal changes and ectoenzyme profile

Cited by 67 publications

References 25 publications

Influence of an estuarine plume and marine sewage outfall on the dynamics of coastal bacterioplankton communities

Influence of an estuarine plume and marine sewage outfall on the dynamics of coastal bacterioplankton communities

Salinity and Physicochemical Water Parameters of the Lower Flow of Neretva River

Sponge-associated bacteria of Lakshadweep coral reefs, India: resource for extracellular hydrolytic enzymes

Contact Info

Product

Resources

About