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Author Lagos, N.A.; Benitez, S.; Duarte, C.; Lardies, M.A.; Broitman, B.R.; Tapia, C.; Tapia, P.; Widdicombe, S.; Vargas, C.A.
Title Effects of temperature and ocean acidification on shell characteristics of Argopecten purpuratus: implications for scallop aquaculture in an upwelling-influenced area Type
Year 2016 Publication Aquaculture Environment Interactions Abbreviated Journal (up) Aquac. Environ. Interact.
Volume 8 Issue Pages 357-370
Keywords Calcification; Shell growth; Scallop farming; Upwelling; Chile
Abstract Coastal upwelling regions already constitute hot spots of ocean acidification as naturally acidified waters are brought to the surface. This effect could be exacerbated by ocean acidification and warming, both caused by rising concentrations of atmospheric CO2. Along the Chilean coast, upwelling supports highly productive fisheries and aquaculture activities. However, during recent years, there has been a documented decline in the national production of the native scallop Argopecten purpuratus. We assessed the combined effects of temperature and pCO(2)-driven ocean acidification on the growth rates and shell characteristics of this species farmed under the natural influence of upwelling waters occurring in northern Chile (30 degrees S, Tongoy Bay). The experimental scenario representing current conditions (14 degrees C, pH similar to 8.0) were typical of natural values recorded in Tongoy Bay, whilst conditions representing the low pH scenario were typical of an adjacent upwelling area (pH similar to 7.6). Shell thickness, weight, and biomass were reduced under low pH (pH similar to 7.7) and increased temperature (18 degrees C) conditions. At ambient temperature (14 degrees C) and low pH, scallops showed increased shell dissolution and low growth rates. However, elevated temperatures ameliorated the impacts of low pH, as evidenced by growth rates in both pH treatments at the higher temperature treatment that were not significantly different from the control treatment. The impact of low pH at current temperature on scallop growth suggests that the upwelling could increase the time required for scallops to reach marketable size. Mortality of farmed scallops is discussed in relation to our observations of multiple environmental stressors in this upwelling-influenced area.
Address [Lagos, Nelson A.; Benitez, Samanta] Univ Santo Tomas, Fac Ciencias, Ctr Invest & Innovac Cambio Climat, Santiago 8370003, Chile, Email: nlagoss@santotomas.cl
Corporate Author Thesis
Publisher Inter-Research Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1869-215x ISBN Medium
Area Expedition Conference
Notes WOS:000377605600030 Approved
Call Number UAI @ eduardo.moreno @ Serial 630
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Author Lardies, MA.; Caballero, P.; Duarte, C.; Poupin, M.J.
Title Geographical Variation in Phenotypic Plasticity of Intertidal Sister Limpet's Species Under Ocean Acidification Scenarios Type
Year 2021 Publication Frontiers in Marine Science Abbreviated Journal (up) Front. Mar. Sci.
Volume 8 Issue Pages 647087
Keywords METABOLIC-RATE; CLIMATE-CHANGE; SEAWATER ACIDIFICATION; CARBONIC-ACID; HIGH PCO(2); MARINE; IMPACTS; CALCIFICATION; TEMPERATURE; RESPONSES
Abstract Ocean Acidification (OA) can have pervasive effects in calcifying marine organisms, and a better understanding of how different populations respond at the physiological and evolutionary level could help to model the impacts of global change in marine ecosystems. Due to its natural geography and oceanographic processes, the Chilean coast provides a natural laboratory where benthic organisms are frequently exposed to diverse projected OA scenarios. The goal of this study was to assess whether a population of mollusks thriving in a more variable environment (Talcaruca) would present higher phenotypic plasticity in physiological and morphological traits in response to different pCO(2) when compared to a population of the same species from a more stable environment (Los Molles). To achieve this, two benthic limpets (Scurria zebrina and Scurria viridula) inhabiting these two contrasting localities were exposed to ocean acidification experimental conditions representing the current pCO(2) in the Chilean coast (500 mu atm) and the levels predicted for the year 2100 in upwelling zones (1500 (mu atm). Our results show that the responses to OA are species-specific, even in this related species. Interestingly, S. viridula showed better performance under OA than S. zebrina (i.e., similar sizes and carbonate content in individuals from both populations; lower effects of acidification on the growth rate combined with a reduction of metabolism at higher pCO2). Remarkably, these characteristics could explain this species' success in overstepping the biogeographical break in the area of Talcaruca, which S. zebrina cannot achieve. Besides, the results show that the habitat factor has a strong influence on some traits. For instance, individuals from Talcaruca presented a higher growth rate plasticity index and lower shell dissolution rates in acidified conditions than those from Los Molles. These results show that limpets from the variable environment tend to display higher plasticity, buffering the physiological effects of OA compared with limpets from the more stable environment. Taken together, these findings highlight the key role of geographic variation in phenotypic plasticity to determine the vulnerability of calcifying organisms to future scenarios of OA.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2296-7745 ISBN Medium
Area Expedition Conference
Notes WOS:000651384500001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1383
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Author Martel, S.I.; Fernandez, C.; Lagos, N.A.; Labra, F.A.; Duarte, C.; Vivanco, J.F.; Garcia-Herrera, C.; Lardies, M.A.
Title Acidification and high-temperature impacts on energetics and shell production of the edible clam Ameghinomya antiqua Type
Year 2022 Publication Frontiers in Marine Science Abbreviated Journal (up) Front. Mar. Sci.
Volume 9 Issue Pages 972135
Keywords ecophysiology; ocean warming; metabolic depression; decalcification; artisanal fisheries; infaunal bivalves
Abstract Warming and ocean acidification are currently critical global change drivers for marine ecosystems due to their complex and irreversible effects on the ecology and evolution of marine communities. Changes in the chemistry and the temperature of the ocean impact the biological performance of marine resources by affecting their energy budget and thus imposing energetic restrictions and trade-offs on their survival, growth, and reproduction. In this study, we evaluated the interplaying effects of increased pCO(2) levels and temperature on the economically relevant clam Ameghinomya antiqua, an infaunal bivalve inhabiting a wide distributional range along the coast of Chile. Juvenile clams collected from southern Chile were exposed to a 90-day experimental set-up emulating the current and a future scenario projeced to the end of the current century for both high pCO(2)/low-pH and temperature (10 and 15 degrees C) projected for the Chilean coast. Clams showed physiological plasticity to different projected environmental scenarios without mortality. In addition, our results showed that the specimens under low-pH conditions were not able to meet the energetic requirements when increased temperature imposed high maintenance costs, consequently showing metabolic depression. Indeed, although the calcification rate was negative in the high-pCO(2) scenario, it was the temperature that determined the amount of shell loss. These results indicate that the studied clam can face environmental changes for short-term periods modifying energetic allocation on maintenance and growth processes, but with possible long-term population costs, endangering the sustainability of an important benthic artisanal fisheries resource.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2296-7745 ISBN Medium
Area Expedition Conference
Notes WOS:000862307200001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1684
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Author Bustamante, M.; Rienzo, A.; Osorio, R.; Lefranc, E.; Duarte, M.; Herrera, E.; Lefranc, G.
Title Algorithm for Processing Mammography: Detection of Microcalcifications Type
Year 2018 Publication Ieee Latin America Transactions Abbreviated Journal (up) IEEE Latin Am. Trans.
Volume 16 Issue 9 Pages 2460-2466
Keywords Breast cancer; Image processing; Microcalcifications; X-ray image
Abstract A new algorithm based in Creme Filter, is proposed for breast cancer detection. The images obtained show micro calcifications with better contrast, allowing a better prognosis. The algorithm has only one parameter free, that permitting to observe texture when parameter is changed.
Address [Bustamante, M.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago, Chile, Email: Miguel.bustamante@uai.cl;
Corporate Author Thesis
Publisher Ieee-Inst Electrical Electronics Engineers Inc Place of Publication Editor
Language Spanish Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1548-0992 ISBN Medium
Area Expedition Conference
Notes WOS:000480361900021 Approved
Call Number UAI @ eduardo.moreno @ Serial 1042
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Author Osores, S.J.A.; Lagos, N.A.; Martin, V.S.; Manriquez, P.H.; Vargas, C.A.; Torres, R.; Navarro, J.M.; Poupin, M.J.; Saldias, G.S.; Lardies, M.A.
Title Plasticity and inter-population variability in physiological and life-history traits of the mussel Mytilus chilensis: A reciprocal transplant experiment Type
Year 2017 Publication Journal Of Experimental Marine Biology And Ecology Abbreviated Journal (up) J. Exp. Mar. Biol. Ecol.
Volume 490 Issue Pages 1-12
Keywords Salinity; Ocean acidification; Estuaries; Heat shock protein; Ingestion rate; Metabolism; Calcification; Aquaculture
Abstract Geographically widespread species must cope with environmental differences between habitats. Information concerning geographic variations in response to climate variability is critical because many morphological, life history and physiological traits show variation across space. Reciprocal transplant experiments have shown to be relevant to evaluate the role of phenotypic plasticity and potential local adaptation in ecophysiological responses when coping with environmental variability. In this study, we characterize through reciprocal transplant experiments the reaction norms of morphological, biochemical, physiological and life-history traits between two intertidal populations of the socioeconomically important mussel Mytilus chilensis, inhabiting contrasting local environments (estuarine vs coastal habitats). We found a gradient in phenotypic plasticity with plastic trait responses in metabolic, ingestion and clearance rates, and in HsP(70) gene expression, and some traits with responses more canalized as growth and calcification rates. This emphasizes that responses not only vary across different local populations but also in different traits in M. chilensis, thus it is difficult to establish an overall trend of the responses at integrated organismal level. Moreover, the synergistic interaction of factors such as salinity and carbonate system parameters evaluated make it necessary to study the response at the population level with emphasis on benthic species important in aquaculture. Finally, field studies such as this one are useful for documenting the patterns of traits variation that occur in nature, identifying possible causes of such variation, and generating testable hypotheses for future controlled experiments. (C) 2017 Elsevier B.V. All rights reserved.
Address [Osores, Sebastian J. A.; Josefina Poupin, M.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Diagonal Torres 2640, Santiago, Chile, Email: marco.lardies@uai.cl
Corporate Author Thesis
Publisher Elsevier Science Bv Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0022-0981 ISBN Medium
Area Expedition Conference
Notes WOS:000397698200001 Approved
Call Number UAI @ eduardo.moreno @ Serial 716
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Author Ramajo, L.; Prado, L.; Rodriguez-Navarro, A.B.; Lardies, M.A.; Duarte, C.M.; Lagos, N.A.
Title Plasticity and trade-offs in physiological traits of intertidal mussels subjected to freshwater-induced environmental variation Type
Year 2016 Publication Marine Ecology Progress Series Abbreviated Journal (up) Mar. Ecol.-Prog. Ser.
Volume 553 Issue Pages 93-109
Keywords Calcification; Shell periostracum; Metabolism; Local adaptation; Central Chile; Perumytilus purpuratus
Abstract Environmental gradients play an important role in shaping geographic variability in coastal marine populations. Thus, the ability of organisms to cope with these changes will depend on their potential to acclimatize, or adapt, to these new environmental conditions. We investigated the spatial variability in biological responses shown by Perumytilus purpuratus mussels collected from 2 intertidal areas experiencing contrasting freshwater input influences (river-influenced vs. marine conditions). To highlight the role of plasticity and adaptive potential in biological responses, we performed a reciprocal-transplant experiment and measured relevant phenotypic traits including mortality, growth, calcification, metabolism, and chemical composition of the shell periostra cum. We determined that mussels exposed to river-influenced conditions had increased metabolic rates and reduced growth rates, as compared to mussels experiencing marine conditions (p < 0.05). While the energy investment strategies of the 2 local populations resulted in similar net calcification rates, these rates decreased significantly when mussels were transplanted to the river-influenced site. Stressful conditions at the river-influenced site were evidenced by decreased survivorship across treatments. Freshwater inputs modify the organic composition of the shell periostracum through a significant reduction in polysaccharides. Although our field experiment did not identify specific environmental factors underlying these contrasting phenotypic changes, the results imply that plasticity plays a strong role when P. purpuratus is exposed to some combination of natural (e.g. salinity) and anthropogenic influences (e.g. pollution), and that the lack of exposure to freshwater may promote less tolerant mussels with greater potential for local adaptation.
Address [Ramajo, Laura; Duarte, Carlos M.] CSIC UIB, Inst Mediterraneo Estudios Avanzados IMEDEA, Global Change Dept, C Miquel Marques 21, Esporles 07190, Mallorca, Spain, Email: nlagoss@ust.cl
Corporate Author Thesis
Publisher Inter-Research Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0171-8630 ISBN Medium
Area Expedition Conference
Notes WOS:000383800600007 Approved
Call Number UAI @ eduardo.moreno @ Serial 659
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Author Bustamante, M.; Lefranc, G.
Title Degradation Model Of Breast Imaging By Dispersed Radiation Type
Year 2011 Publication Proceedings Of The Romanian Academy Series A-Mathematics Physics Technical Sciences Information Science Abbreviated Journal (up) Proc. Rom. Acad. Ser. A-Math. Phys.
Volume 12 Issue 4 Pages 347-352
Keywords Mammogram; Microcalcification; Computer Vision; Cancer analysis
Abstract This paper presents a model of interaction of radiation on breast, based on Bosso's filter. This model is used to improve mammographic images for early cancer diagnosis, to be more accurate and to detect cluster of microcalcifications. The model is based on degradation of breast image produced by dispersed radiation using the Bosso's filter, developed earlier.
Address [Bustamante, Miguel] Univ Adolfo Ibanez, Fac Ingn, Recreo, Chile, Email: miguel.bustamante@uai.cl
Corporate Author Thesis
Publisher Editura Acad Romane Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1454-9069 ISBN Medium
Area Expedition Conference
Notes WOS:000298771700012 Approved
Call Number UAI @ eduardo.moreno @ Serial 189
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