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Author Aguilera, V.M.; Vargas, C.A.; Lardies, M.A.; Poupin, M.J. pdf  doi
openurl 
  Title Adaptive variability to low-pH river discharges in Acartia tonsa and stress responses to high PCO2 conditions Type Journal Article
  Year 2016 Publication Marine Ecology-An Evolutionary Perspective Abbreviated Journal Mar. Ecol.-Evol. Persp.  
  Volume 37 Issue 1 Pages 215-226  
  Keywords Adaptive variability; copepods; low pH; ocean acidification; river discharges  
  Abstract Environmental transitions leading to spatial physical-chemical gradients are of ecological and evolutionary interest because they are able to induce variations in phenotypic plasticity. Thus, the adaptive variability to low-pH river discharges may drive divergent stress responses [ingestion rates (IR) and expression of stress-related genes such as Heat shock protein 70 (Hsp70) and Ferritin] in the neritic copepod Acartia tonsa facing changes in the marine chemistry associated to ocean acidification (OA). These responses were tested in copepod populations inhabiting two environments with contrasting carbonate system parameters (an estuarine versus coastal area) in the Southern Pacific Ocean, and assessing an insitu and 96-h experimental incubation under conditions of high pressure of CO2 (PCO2 1200ppm). Adaptive variability was a determining factor in driving variability of copepods' responses. Thus, the food-rich but colder and corrosive estuary induced a traits trade-off expressed as depressed IR under insitu conditions. However, this experience allowed these copepods to tolerate further exposure to high PCO2 levels better, as their IRs were on average 43% higher thanthose of the coastal individuals. Indeed, expression of both the Hsp70 and Ferritin genes in coastal copepods was significantly higher after acclimation to high PCO2 conditions. Along with other recent evidence, our findings confirm that adaptation to local fluctuations in seawater pH seems to play a significant role in the response of planktonic populations to OA-associated conditions. Facing the environmental threat represented by the inter-play between multiple drivers of climate change, this biological feature should be examined in detail asa potential tool for risk mitigation policies in coastal management arrangements.  
  Address [Aguilera, Victor M.] Univ Antofagasta, Inst Ciencias Nat Alexander von Humboldt, Ave Univ Antofagasta 02800,POB 170, Antofagasta, Chile, Email: victor.aguilera@uantof.cl  
  Corporate Author Thesis  
  Publisher Wiley-Blackwell Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0173-9565 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000370133500015 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 590  
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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. pdf  doi
openurl 
  Title Plasticity and inter-population variability in physiological and life-history traits of the mussel Mytilus chilensis: A reciprocal transplant experiment Type Journal Article
  Year 2017 Publication Journal Of Experimental Marine Biology And Ecology Abbreviated Journal 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 no  
  Call Number UAI @ eduardo.moreno @ Serial 716  
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Author Ramajo, L.; Marba, N.; Prado, L.; Peron, S.; Lardies, M.A.; Rodriguez-Navarro, A.B.; Vargas, C.A.; Lagos, N.A.; Duarte, C.M. pdf  doi
openurl 
  Title Biomineralization changes with food supply confer juvenile scallops (Argopecten purpuratus) resistance to ocean acidification Type Journal Article
  Year 2016 Publication Global Change Biology Abbreviated Journal Glob. Change Biol.  
  Volume 22 Issue 6 Pages 2025-2037  
  Keywords food; natural variability; ocean acidification; periostracum; protein expression; resistance; tolerance  
  Abstract Future ocean acidification (OA) will affect physiological traits of marine species, with calcifying species being particularly vulnerable. As OA entails high energy demands, particularly during the rapid juvenile growth phase, food supply may play a key role in the response of marine organisms to OA. We experimentally evaluated the role of food supply in modulating physiological responses and biomineralization processes in juveniles of the Chilean scallop, Argopecten purpuratus, that were exposed to control (pH similar to 8.0) and low pH (pH similar to 7.6) conditions using three food supply treatments (high, intermediate, and low). We found that pH and food levels had additive effects on the physiological response of the juvenile scallops. Metabolic rates, shell growth, net calcification, and ingestion rates increased significantly at low pH conditions, independent of food. These physiological responses increased significantly in organisms exposed to intermediate and high levels of food supply. Hence, food supply seems to play a major role modulating organismal response by providing the energetic means to bolster the physiological response of OA stress. On the contrary, the relative expression of chitin synthase, a functional molecule for biomineralization, increased significantly in scallops exposed to low food supply and low pH, which resulted in a thicker periostracum enriched with chitin polysaccharides. Under reduced food and low pH conditions, the adaptive organismal response was to trade-off growth for the expression of biomineralization molecules and altering of the organic composition of shell periostracum, suggesting that the future performance of these calcifiers will depend on the trajectories of both OA and food supply. Thus, incorporating a suite of traits and multiple stressors in future studies of the adaptive organismal response may provide key insights on OA impacts on marine calcifiers.  
  Address [Ramajo, Laura; Marba, Nuria] Inst Mediterraneo Estudios Avanzados CSIC UIB, Global Change Dept, C Miquel Marques 21, Esporles 07190, Islas Baleares, Spain, Email: lramajo@imedea.uib-csic.es  
  Corporate Author Thesis  
  Publisher Wiley-Blackwell Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1354-1013 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000378721700004 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 642  
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Author Ramajo, L.; Rodriguez-Navarro, A.B.; Duarte, C.M.; Lardies, M.A.; Lagos, N.A. pdf  doi
openurl 
  Title Shifts in shell mineralogy and metabolism of Concholepas concholepas juveniles along the Chilean coast Type Journal Article
  Year 2015 Publication Marine And Freshwater Research Abbreviated Journal Mar. Freshw. Res.  
  Volume 66 Issue 12 Pages 1147-1157  
  Keywords calcium carbonate; metabolism; ocean acidification; temperature  
  Abstract Along the west coast of South America, from the tropical zone to the Patagonian waters, there is a significant latitudinal gradient in seawater temperature, salinity and carbonate chemistry. These physical-chemical changes in seawater induce morphological and physiological responses in calcifying organisms, which may alter their energy budget and calcification processes. In this study, we study the organism energy maintenance (i.e. metabolic rate) and mineralogical composition of the shell of the juvenile marine snails Concholepas concholepas (Gastropoda: Muricidae), collected from benthic populations located similar to 2000km apart, varies across geographic regions along the Chilean coast. We found that in juvenile snails, the calcite:aragonite ratio in the pallial shell margin (i.e. newly deposited shell) increase significantly from northern to southern populations and this increase in calcite precipitation in the shell of juveniles snails was associated with a decrease in oxygen consumption rates in these populations. Our result suggests that calcite secretion may be favoured when metabolic rates are lowered, as this carbonate mineral phase might be less energetically costly for the organism to precipitate. This result is discussed in relation to the natural process such as coastal upwelling and freshwater inputs that promote geographic variation in levels of pH and carbonate saturation state in seawater along the Chilean coast.  
  Address [Ramajo, Laura; Duarte, Carlos M.] CSIC UIB, Inst Mediterraneo Estudios Avanzados IMEDEA, Global Change Dept, E-07190 Esporles, Islas Baleares, Spain, Email: lramajo@imedea.uib-csic.es  
  Corporate Author Thesis  
  Publisher Csiro Publishing Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1323-1650 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000366105500008 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 561  
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Author Torres, R.; Manriquez, P.H.; Duarte, C.; Navarro, J.M.; Lagos, N.A.; Vargas, C.A.; Lardies, M.A. pdf  url
openurl 
  Title Evaluation of a semi-automatic system for long-term seawater carbonate chemistry manipulation Type Journal Article
  Year 2013 Publication Revista Chilena De Historia Natural Abbreviated Journal Rev. Chil. Hist. Nat.  
  Volume 86 Issue 4 Pages 443-451  
  Keywords carbonate chemistry manipulation; ocean acidification  
  Abstract The assessment of the effects of Ocean Acidification (OA) on marine life has received increasing attention in recent marine research. On a mesocosmic scale, the CO2 levels in seawater can be manipulated to evaluate experimentally the consequences of OA on marine organisms (vertebrates and invertebrates). An ideal manipulation of carbonate chemistry should mimic exactly the changes to carbonate chemistry, which will occur in years to come. Although some methods have been described in the literature, here we describe in detail a simple, robust and inexpensive system to produce CO2-enriched seawater by bubbling the seawater with air-CO2 mixtures. The system uses mass flow controllers (MFC) to blend atmospheric air with pure CO2 to produce two pCO(2) levels. The air-CO2 mixtures are delivered continuously to seawater equilibration reservoirs, and simultaneously to an infrared CO2 analyser to verify CO2 levels in the air-CO2 mixture delivered to the equilibration tanks. We monitored both pH and total alkalinity in the equilibration reservoirs over a period of one year in order to document the long-term performance of this system for simulating the future carbonate chemistry of seawater in a coastal laboratory. System performance was sufficient to maintain three contrasting (e.g., 397, 709 and 1032 matm) and relatively constant (the coefficient of variability was 11 %, 9 % and 9 % respectively) seawater pCO(2) during a year-long monitoring.  
  Address [Torres, Rodrigo] CIEP, Coyhaique, Chile, Email: rtorres@ciep.cl  
  Corporate Author Thesis  
  Publisher Soc Biolgia Chile Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0716-078x ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000332750700006 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 359  
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