The effect of sediment mimicking drill cuttings on deep water rhodoliths in a flow-through system: Experimental work and modeling

Figueiredo, Márcia Feijão de; Eide, Ingvar; Reynier, Marcia Vieira; Villas-Bôas, Alexandre B.; Tâmega, Frederico Tapajós de Souza; Ferreira, Carlos Gustavo; Nilssen, Ingunn; Coutinho, Ricardo; Johnsen, Ståle

doi:10.1016/j.marpolbul.2015.04.040

Cited by 21 publications

(29 citation statements)

References 39 publications

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“…Also, rhodolith beds can be affected indirectly by discharges of drill cuttings from oil and gas activities (DAVIES et al, 2007). These activities on the Brazilian shelf adjacent to the beds result in a fine sediment cover of the algae that can cause reductions in their net primary production up to 50-70% (RIUL et al, 2008;FIGUEIREDO et al, 2015). This reduction in primary production severely impacts rhodolith-forming algae, and has high potential to compromise the establishment of associated diversity.…”

Section: Global and Local Threatsmentioning

confidence: 99%

Rhodoliths in Brazil: Current knowledge and potential impacts of climate change

et al. 2016

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Financial Support: CNPQ, CAPES, FAPESP.Rhodolith beds are important marine benthic ecosystems, representing oases of high biodiversity among sedimentary seabed environments. They are found frequently and abundantly, acting as major carbonate 'factories' and playing a key role in the biogeochemical cycling of carbonates in the South Atlantic. Rhodoliths are under threat due to global change (mainly related to ocean acidification and global warming) and local stressors, such as fishing and coastal run-off. Here, we review different aspects of the biology of these organisms, highlighting the predicted effects of global change, considering the additional impact of local stressors. Ocean acidification (OA) represents a particular threat that can reduce calcification or even promote the decalcification of these bioengineers, thus increasing the ecophysiological imbalance between calcareous and fleshy algae. OA should be considered, but this together with extreme events such as heat waves and storms, as main stressors of these ecosystems at the present time, will worsen in the future, especially if possible interactions with local stressors like coastal pollution are taken into consideration. Thus, in Brazil there is a serious need for starting monitoring programs and promote innovative experimental infrastructure in order to improve our knowledge of these rich environments, optimize management efforts and enhance the needed conservation initiatives. AbstrActDescriptors: Algae, Conservation, Brazil, Global warming, Pollution, Ocean acidification.Bancos de rodolitos formam oásis de alta biodiversidade em ambientes marinhos de fundo arenoso. Os rodolitos são formados por espécies bioconstrutoras, que fornecem abrigo e substrato para diversas e abundantes comunidades bentônicas. No Brasil esses ambientes são frequentes, representando grandes "fábricas" de carbonato com um papel fundamental no ciclo biogeoquímico do carbono no Atlântico Sul. Estes organismos e ambientes estão ameaçados pelas mudanças climáticas (principalmente a acidificação dos oceanos e o aquecimento global) e pelos estressores locais, tais como os impactos causados pela pesca e as descargas costeiras de efluentes. Neste trabalho fazemos uma revisão da taxonomia, filogenia e biologia desses organismos, com destaque para os efeitos previstos das mudanças climáticas e suas relações com estressores locais. A maioria dos estudos acerca dos efeitos das mudanças climáticas e da acidificação dos oceanos em algas calcárias relatam respostas negativas não só no crescimento e na calcificação, mas também no processo de fotossíntese, espessura da parede celular, reprodução e sobrevivência das algas. Este cenário reforça a necessidade em estabelecer uma consistente rede de trabalho para proporcionar um programa de monitoramento amplo e de longo prazo, bem como infraestrutura para avaliações experimentais de impactos locais e regionais das mudanças climáticas e dos estressores locais em bancos de rodolitos.

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Section: Global and Local Threatsmentioning

confidence: 99%

Rhodoliths in Brazil: Current knowledge and potential impacts of climate change

et al. 2016

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“…Figueiredo et al (2015) related the categorised stress levels to corresponding photosynthetic efficiency in their study with sediment coverage on Mesophyllum and Lithothamnion. The photosynthetic efficiency was measured as in vivo maximum quantum yield Fig.…”

Section: Effect Data and Impact Categoriesmentioning

confidence: 99%

“…The corresponding F PSIImax values are 0.46e0.55, 0.36e0.45, 0.26e0.35 and <0.26, respectively, implying that the two most severe stress levels were merged into one category. The corresponding sediment coverage intervals were obtained from the combined exposureeresponse relationship for photosynthetic efficiency as function of sediment coverage for the two algae species as described by Figueiredo et al (2015). Sediment coverage and photosynthetic efficiency were measured in a flow-through system varying light intensity, flow rate and added amount of sediment once a week for nine weeks.…”

Section: Effect Data and Impact Categoriesmentioning

confidence: 99%

“…2). The flow-through system used by Figueiredo et al (2015) for the exposure studies was also used in the sedimentation experiments, however, without rhodoliths in the chambers.…”

Section: Sedimentation Experimentsmentioning

confidence: 99%

“…The flow rates were 0.04, 0.07, and 0.09 m s À1 , identical to those used in Figueiredo et al (2015) and the amount of sediment added were 600, 750, 900, 1050 and 1200 g.…”

Section: Sedimentation Experimentsmentioning

confidence: 99%

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Assessing the potential impact of water-based drill cuttings on deep-water calcareous red algae using species specific impact categories and measured oceanographic and discharge data

Nilssen

Santos²,

Coutinho

et al. 2015

Marine Environmental Research

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Integrated environmental monitoring and multivariate data analysis-A case study

Eide

Westad

Nilssen

et al. 2016

Integr Environ Assess Manag

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The present article describes integration of environmental monitoring and discharge data and interpretation using multivariate statistics, principal component analysis (PCA), and partial least squares (PLS) regression. The monitoring was carried out at the Peregrino oil field off the coast of Brazil. One sensor platform and 3 sediment traps were placed on the seabed. The sensors measured current speed and direction, turbidity, temperature, and conductivity. The sediment trap samples were used to determine suspended particulate matter that was characterized with respect to a number of chemical parameters (26 alkanes, 16 PAHs, N, C, calcium carbonate, and Ba). Data on discharges of drill cuttings and water-based drilling fluid were provided on a daily basis. The monitoring was carried out during 7 campaigns from June 2010 to October 2012, each lasting 2 to 3 months due to the capacity of the sediment traps. The data from the campaigns were preprocessed, combined, and interpreted using multivariate statistics. No systematic difference could be observed between campaigns or traps despite the fact that the first campaign was carried out before drilling, and 1 of 3 sediment traps was located in an area not expected to be influenced by the discharges. There was a strong covariation between suspended particulate matter and total N and organic C suggesting that the majority of the sediment samples had a natural and biogenic origin. Furthermore, the multivariate regression showed no correlation between discharges of drill cuttings and sediment trap or turbidity data taking current speed and direction into consideration. Because of this lack of correlation with discharges from the drilling location, a more detailed evaluation of chemical indicators providing information about origin was carried out in addition to numerical modeling of dispersion and deposition. The chemical indicators and the modeling of dispersion and deposition support the conclusions from the multivariate statistics. Integr Environ Assess Manag 2017;13:387-395. © 2016 SETAC.

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The effect of sediment mimicking drill cuttings on deep water rhodoliths in a flow-through system: Experimental work and modeling

Cited by 21 publications

References 39 publications

Rhodoliths in Brazil: Current knowledge and potential impacts of climate change

Rhodoliths in Brazil: Current knowledge and potential impacts of climate change

Assessing the potential impact of water-based drill cuttings on deep-water calcareous red algae using species specific impact categories and measured oceanographic and discharge data

Integrated environmental monitoring and multivariate data analysis-A case study

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