Sulphur partitioning in sediments and biodeposits below mussel rafts in the Rı́a de Arousa (Galicia, NW Spain)

Otero, Xosé Luís; Anta, R. Calvo de; Macı́as, Felipe

doi:10.1016/j.marenvres.2005.10.006

Cited by 42 publications

(13 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mussel biodeposits are known to be rich in organic nitrogen, which may be used as a tracer of this type of enrichment in coastal systems (KASPAR et al, 1984;GRENZ et al, 1990). Lower values of C:N related to mussel biodeposits have also been reported by Chamberlain et al (2001), Hartstein and Rowden (2004), Otero et al (2006) and Bonetti et al (2006a). At Museu Beach, no significant differences in the C:N ratio were found between the station groups, but there were other sedimentological descriptors that presented some differences, including the poor sorting of grain sizes, higher skewness of grain distribution and the higher percentage of biodetritic carbonate.…”

Section: Discussionsupporting

confidence: 64%

“…However, a slight elevation was observed in the oldest and shallowest sector of the Alto Ribeirão culture area, suggesting the formation of a local biodeposit layer. Pronounced saliencies under shellfish cultures due to the presence of a biodeposit layer have been reported in other regions with more intensive production (MATTSON; LINDÉN, 1983;OTERO et al, 2006). The Alto Ribeirão site has relatively shallow depths associated with weak hydrodynamics which, according to Jusup et al (2007), reduces the area of particle dispersion and favors biodeposition directly beneath culture operations.…”

Section: Discussionmentioning

confidence: 88%

“…Shellfish culture has been indicated as one of the productive systems that cause the least impact on the environment, in some cases showing no or only minor alterations compared to other potential tensors in coastal areas (GRANT et al, 1995;BONETTI et al, 2006a). However, there are potential impacts of shellfish culture, and in many cases, eutrophication of the benthic layer has also been reported (MATTSON;LINDÉN, 1983;OTERO et al, 2006). Mussels are filtering feeders that release digested excretes in the form of feces and pseudofeces.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Suspended shellfish culture impacts on the benthic layer: a case study in Brazilian subtropical waters

Rudorff

Bonetti

2012

Braz. j. oceanogr.

View full text Add to dashboard Cite

This study aimed to assess benthic impacts of suspended shellfish cultures in two marine farms located in South Bay, Florianópolis (SC, Brazil). The goal was to detect changes in the benthic layer and evaluate the influence of local conditions, such as hydrodynamics and geomorphology, on the degree of impact at each site. The method included analysis of three groups of oceanographic descriptors: hydrodynamic; morpho-sedimentological (bathymetry, grain size and organic content), and ecological (foraminiferal fauna). Data sets were analyzed using geostatistical and multivariate techniques. Ecological descriptors seemed to be more effective under different environmental conditions than sedimentological variables. Those that best identified culture-related biodeposits, were: dominance of Ammonia tepida; test size; and living: total population ratio. Only slight differences were observed within and outside the culture structures. However, a greater alteration was observed at the site with weaker hydrodynamics and located in shallower depths. The conclusion is that biodeposition at studied still causes little alteration in the local benthic environment. However, local factors such as hydrodynamics and geomorphology were shown to be important in minimizing these impacts. These are criteria that should be considered in site selection programs for the development of this productive activity.
O presente trabalho investigou os impactos de cultivos suspensos de moluscos sobre a camada bêntica em duas fazendas marinhas na Baía Sul, Florianópolis (SC, Brasil). O objetivo foi detectar mudanças no ambiente de fundo e avaliar a influência de condições locais, como a hidrodinâmica e geomorfologia, no grau de impacto em cada sítio. O método empregado compreendeu análises de três grupos de descritores oceanográficos: hidrodinâmicos, morfossedimentológicos (batimetria, granulometria e constituintes orgânicos) e ecológicos (fauna foraminífera). Os dados foram analisados com técnicas geoestatísticas e multivariadas. Os descritores ecológicos aparentemente foram mais representativos sob diferentes matrizes ambientais que os sedimentológicos. Os que melhor identificaram áreas sob influência dos cultivos foram: dominância de Ammonia tepida, tamanho das testas e razão foraminíferos vivos: totais. Somente pequenas diferenças foram encontradas dentro e fora das áreas de cultivo. Não obstante, maiores graus de alteração foram observados no sítio com menor hidrodinâmica e profundidades mais rasas. Concluiu-se que o aporte dos cultivos nos sítios estudados ainda ocasiona poucas alterações no ambiente bentônico. No entanto, os fatores locais de hidrodinâmica e geomorfologia foram importantes na minimização dos impactos. Estes devem ser considerados com critérios em programas de seleção de áreas propícias para o desenvolvimento da atividade

show abstract

Section: Discussionsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Suspended shellfish culture impacts on the benthic layer: a case study in Brazilian subtropical waters

Rudorff

Bonetti

2012

Braz. j. oceanogr.

View full text Add to dashboard Cite

show abstract

“…Rates of sulfate reduction can be stimulated by increased input of OM under aquaculture net-pens (Holmer & Kristensen 1992, Holmer & Frederiksen 2007) and the transition to more hypoxic conditions is also characterized by increased sediment oxygen consumption and sediment-water fluxes of dissolved nutrients (Hall et al 1990, 1992, Holby & Hall 1991, Hargrave et al 1993, Holmer et al 2002. Increased bacterial sulfate reduction and the accumulation of metabolic by-products that form both dissolved and particle-bound sulfides such as FeS 2 (pyrite) and other metal-S complexes are underlying causes for the increase in particulate sulfides associated with benthic OM enrichment (Howarth 1979, Berner 1984, Rickard & Morse 2005, Otero et al 2006. Particulate reduced sulfides (pyrite and other types of AVS) are in themselves not toxic to benthic fauna but oxygen consumption by these reduced compounds in surface sediments and direct toxic effects can lead to hypoxic stress on fauna (Theede 1973, Gray 1981, Rosenberg et al 1992, Nilsson & Rosenberg 2000, Gray et al 2002.…”

Section: Enrichment Effects On Benthic Quality and Biodiversity Indicesmentioning

confidence: 99%

Empirical relationships describing benthic impacts of salmon aquaculture

Hargrave

2010

Aquacult. Environ. Interact.

View full text Add to dashboard Cite

Benthic organic enrichment due to sedimentation of waste feed and fecal matter released from salmon and other marine finfish aquaculture facilities has traditionally been measured by observing changes in benthic macrofauna assemblages. Sediment oxygen consumption, dissolved nutrient fluxes and variables such as redox potentials (normalized to hydrogen potential, Eh NHE ) and dissolved 'free' sulfides (Σ S 2 -, HS -, H 2 S) (S) are also sensitive chemical indicators of benthic enrichment effects. Hypoxic or anoxic sediments are formed when high rates of organic matter (OM) sedimentation stimulate anaerobic metabolic processes such as sulfate reduction. General changes in Eh NHE , S, OM flux and indices of macrofauna diversity in sediments as a result of increased organic enrichment around salmon aquaculture sites have been described in numerous studies. Some of the results are summarized here in empirical regressions that relate changes in sediment chemical and benthic biological variables to increased OM supply. The equations are descriptive of the data for salmon aquaculture sites where the studies were performed and further investigations are required to determine if the relationships provide general quantitative expressions for changes in sediment geochemical conditions and macrofauna community structure due to benthic organic enrichment.

show abstract

“…The good correlation observed between the biomarkers in both crabs and clams incubated under field conditions suggests that these locations suffer the stress of non-measured variables which, in the case of site D, could be related to the proximity of aquaculture infrastructures (mussel culture). Other authors (Otero et al, 2006), have described the negative impacts of these mussel aquaculture, including: the discharge of a large volume of biodeposits containing high concentrations of nutrients; the release of drugs and pesticides into the environment; an increase in sedimentation and accumulation of organic matter and an increase in the concentration of nutrients in sediments and waters (mainly N and P). Negative effects on wild populations of animals have also been observed, ranging from genetic interaction and disease transmission, to changes in the composition of the structure of benthic fauna due to a change from oxic to anoxic conditions (Otero et al, 2006).…”

Section: Factor #2mentioning

confidence: 99%

A weight of evidence approach for quality assessment of sediments impacted by an oil spill: The role of a set of biomarkers as a line of evidence

Morales‐Caselles

Riba

DelValls

2009

Marine Environmental Research

View full text Add to dashboard Cite

To cite this version:Carmen Morales-Caselles, Inmaculada Riba, Carmen Sarasquete, T. Ángel Delvalls. A weight of evidence approach for quality assessment of sediments impacted by an oil spill: The role of a set of biomarkers as a line of evidence. Marine Environmental Research, Elsevier, 2008, 67 (1) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. In an attempt to incorporate both line of evidence (LOE) and classical weight of 25 evidence (WOE) approaches for the assessment of sediment quality, a set of biomarkers 26 ACCEPTED MANUSCRIPT 1 A WEIGHT OF EVIDENCE APPROACH FOR QUALITY ASSESSMENT OF 1 SEDIMENTS IMPACTED BY AN OIL SPILL: THE ROLE OF A SET OF 2 BIOMARKERS AS A LINE OF EVIDENCEwere analyzed in target tissues of two invertebrate species after 28 days of exposure to 27 sediments impacted by oil (derived from the tanker Prestige, 2002). The integration of 28 biomarkers with sediment contamination, acute toxicity and benthic alteration 29 parameters provides an "early warning" tool which not only indicates the environmental 30 quality of an area, but also constitutes an advisory tool for potential ecological risks. 31The selected biomarkers provide information about the first biological responses due to 32 the presence of contaminants in the environment providing predictable reports about 33 further effects to the ecosystem. The present study demonstrates that the use of a set of 34 biomarkers as part of a WOE approach designed to assess contaminated sediments 35 contributes added value to the classical LOE and allows characterisation of the 36 environmental status of the studied area in a more precise and accurate way. 37

show abstract

Sulphur partitioning in sediments and biodeposits below mussel rafts in the Rı́a de Arousa (Galicia, NW Spain)

Cited by 42 publications

References 41 publications

Suspended shellfish culture impacts on the benthic layer: a case study in Brazilian subtropical waters

Suspended shellfish culture impacts on the benthic layer: a case study in Brazilian subtropical waters

Empirical relationships describing benthic impacts of salmon aquaculture

A weight of evidence approach for quality assessment of sediments impacted by an oil spill: The role of a set of biomarkers as a line of evidence

Contact Info

Product

Resources

About