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Ramajo, L.; Marba, N.; Prado, L.; Peron, S.; Lardies, M.A.; Rodriguez-Navarro, A.B.; Vargas, C.A.; Lagos, N.A.; Duarte, C.M. |
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Title |
Biomineralization changes with food supply confer juvenile scallops (Argopecten purpuratus) resistance to ocean acidification |
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Year |
2016 |
Publication |
Global Change Biology |
Abbreviated Journal |
Glob. Change Biol. |
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Volume |
22 |
Issue |
6 |
Pages |
2025-2037 |
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Keywords |
food; natural variability; ocean acidification; periostracum; protein expression; resistance; tolerance |
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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. |
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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 |
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Wiley-Blackwell |
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English |
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ISSN |
1354-1013 |
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Notes |
WOS:000378721700004 |
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Call Number |
UAI @ eduardo.moreno @ |
Serial |
642 |
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Author |
Ramajo, L.; Prado, L.; Rodriguez-Navarro, A.B.; Lardies, M.A.; Duarte, C.M.; Lagos, N.A. |
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Title |
Plasticity and trade-offs in physiological traits of intertidal mussels subjected to freshwater-induced environmental variation |
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Year |
2016 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
Mar. Ecol.-Prog. Ser. |
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Volume |
553 |
Issue |
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Pages |
93-109 |
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Keywords |
Calcification; Shell periostracum; Metabolism; Local adaptation; Central Chile; Perumytilus purpuratus |
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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. |
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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 |
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Publisher |
Inter-Research |
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English |
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ISSN |
0171-8630 |
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Notes |
WOS:000383800600007 |
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Call Number |
UAI @ eduardo.moreno @ |
Serial |
659 |
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Author |
Ramajo, L.; Rodriguez-Navarro, A.B.; Duarte, C.M.; Lardies, M.A.; Lagos, N.A. |
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Title |
Shifts in shell mineralogy and metabolism of Concholepas concholepas juveniles along the Chilean coast |
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Year |
2015 |
Publication |
Marine And Freshwater Research |
Abbreviated Journal |
Mar. Freshw. Res. |
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Volume |
66 |
Issue |
12 |
Pages |
1147-1157 |
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Keywords |
calcium carbonate; metabolism; ocean acidification; temperature |
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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. |
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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 |
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Publisher |
Csiro Publishing |
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Language |
English |
Summary Language |
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Original Title |
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Abbreviated Series Title |
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Series Volume |
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Edition |
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ISSN |
1323-1650 |
ISBN |
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Notes |
WOS:000366105500008 |
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Call Number |
UAI @ eduardo.moreno @ |
Serial |
561 |
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