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Author Lagos, N.A.; Benitez, S.; Grenier, C.; Rodriguez-Navarro, A.B.; Garcia-Herrera, C.; Abarca-Ortega, A.; Vivanco, J.F.; Benjumeda, I.; Vargas, C.A.; Duarte, C.; Lardies, M.A. doi  openurl
  Title Plasticity in organic composition maintains biomechanical performance in shells of juvenile scallops exposed to altered temperature and pH conditions Type
  Year 2021 Publication Scientific Reports Abbreviated Journal Sci. Rep.  
  Volume 11 Issue 1 Pages 24201  
  Keywords OCEAN ACIDIFICATION; ELEVATED-TEMPERATURE; COMPENSATORY MECHANISM; SEAWATER ACIDIFICATION; CLIMATE-CHANGE; IMPACTS; BIOMINERALIZATION; RESPONSES; MUSSELS; INTENSIFICATION  
  Abstract The exposure to environmental variations in pH and temperature has proven impacts on benthic ectotherms calcifiers, as evidenced by tradeoffs between physiological processes. However, how these stressors affect structure and functionality of mollusk shells has received less attention. Episodic events of upwelling of deep cold and low pH waters are well documented in eastern boundary systems and may be stressful to mollusks, impairing both physiological and biomechanical performance. These events are projected to become more intense, and extensive in time with ongoing global warming. In this study, we evaluate the independent and interactive effects of temperature and pH on the biomineral and biomechanical properties of Argopecten purpuratus scallop shells. Total organic matter in the shell mineral increased under reduced pH (similar to 7.7) and control conditions (pH similar to 8.0). The periostracum layer coating the outer shell surface showed increased protein content under low pH conditions but decreasing sulfate and polysaccharides content. Reduced pH negatively impacts shell density and increases the disorder in the orientation of calcite crystals. At elevated temperatures (18 degrees C), shell microhardness increased. Other biomechanical properties were not affected by pH/temperature treatments. Thus, under a reduction of 0.3 pH units and low temperature, the response of A. purpuratus was a tradeoff among organic compounds (biopolymer plasticity), density, and crystal organization (mineral plasticity) to maintain shell biomechanical performance, while increased temperature ameliorated the impacts on shell hardness. Biopolymer plasticity was associated with ecophysiological performance, indicating that, under the influence of natural fluctuations in pH and temperature, energetic constraints might be critical in modulating the long-term sustainability of this compensatory mechanism.  
  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 2045-2322 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000731322900005 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1522  
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Author Navarro, J.M.; Duarte, C.; Manriquez, P.H.; Lardies, M.A.; Torres, R.; Acuna, K.; Vargas, C.A.; Lagos, N.A. pdf  doi
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  Title Ocean warming and elevated carbon dioxide: multiple stressor impacts on juvenile mussels from southern Chile Type
  Year 2016 Publication Ices Journal Of Marine Science Abbreviated Journal ICES J. Mar. Sci.  
  Volume 73 Issue 3 Pages 764-771  
  Keywords high CO2; multiple stressors; mussels; ocean warming; scope for growth; thermal window  
  Abstract The combined effect of increased ocean warming and elevated carbon dioxide in seawater is expected to have significant physiological and ecological consequences at many organizational levels of the marine ecosystem. In the present study, juvenile mussels Mytilus chilensis were reared for 80 din a factorial combination of two temperatures (12 and 16 degrees C) and three pCO(2) levels (380, 700, and 1000 μatm). We investigated the combined effects of increasing seawater temperature and pCO(2) on the physiological performance (i.e. feeding, metabolism, and growth). Lower clearance rate (CR) occurred at the highest pCO(2) concentration (1000 μatm) compared with the control (380 μatm) and with the intermediate concentration of pCO(2) (700 μatm). Conversely, CR was significantly higher at 16 degrees C than at 12 degrees C. Significant lower values of oxygen uptake were observed in mussels exposed to 1000 μatm pCO(2) level compared with those exposed to 380 μatm pCO(2). Scope for growth (SFG) was significantly lower at the highest pCO(2) concentration compared with the control. Mussels exposed to 700 μatm pCO(2) did not show significantly different SFG from the other two pCO(2) treatments. SFG was significantly higher at 16 degrees C than at 12 degrees C. This might be explained because the experimental mussels were exposed to temperatures experienced in their natural environment, which are within the range of thermal tolerance of the species. Our results suggest that the temperature rise within the natural range experienced by M. chilensis generates a positive effect on the processes related with energy gain (i.e. feeding and absorption) to be allocated to growth. In turn, the increase in the pCO(2) level of 1000 μatm, independent of temperature, adversely affects this species, with significantly reduced energy allocated to growth (SFG) compared with the control treatment.  
  Address [Navarro, Jorge M.; Acuna, Karin] Univ Austral Chile, Fac Ciencias, Lab Costero Calfuco, Inst Ciencias Marinas & Limnol, Valdivia, Chile, Email: jnavarro@uach.cl  
  Corporate Author Thesis  
  Publisher Oxford Univ Press Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1054-3139 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000371142000025 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 587  
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