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  1. AU="Vargas, Cristian A"
  2. AU="Kramer, Mordechai"
  3. AU="Ben Mustapha, Imen"
  4. AU="Kong, Xueqian"
  5. AU="Phan, Ngoc Minh Hien"
  6. AU="Khan, Tazeen"
  7. AU="Adzhubei, Ivan A"
  8. AU="Alicia Reyes-Arellano"
  9. AU="L. Marcus Wilhelmsson"
  10. AU=Filocamo Giovanni
  11. AU="Andrea Terán-Valdez"
  12. AU=Cleverley Joanne AU=Cleverley Joanne
  13. AU="Feng, Shiguang"
  14. AU="De Falco, Antonio"
  15. AU="Plenter, R J"
  16. AU="Malarz, Janusz"

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Treffer 1 - 10 von insgesamt 42

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  1. Artikel: Upper environmental pCO2 drives sensitivity to ocean acidification in marine invertebrates

    Vargas, Cristian A.

    Nature climate change

    2022  Band 12, Heft 2, Seite(n) 200

    Sprache Englisch
    Dokumenttyp Artikel
    ZDB-ID 2614383-5
    ISSN 1758-678x
    Datenquelle Current Contents Ernährung, Umwelt, Agrar

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  2. Artikel ; Online: Long term environmental variability modulates the epigenetics of maternal traits of kelp crabs in the coast of Chile.

    Baldanzi, Simone / Saldías, Gonzalo S / Vargas, Cristian A / Porri, Francesca

    Scientific reports

    2022  Band 12, Heft 1, Seite(n) 18806

    Abstract: The methylation of DNA is an environmentally inducible epigenetic mechanism reflecting the short-term ecological and environmental background of populations. Marine invertebrate populations, which spread along a latitudinal cline, are particularly ... ...

    Abstract The methylation of DNA is an environmentally inducible epigenetic mechanism reflecting the short-term ecological and environmental background of populations. Marine invertebrate populations, which spread along a latitudinal cline, are particularly suitable for profiling DNA methylation, due to the heterogenous environmental conditions experienced. We used the MSAP (Methylation Sensitive Amplified Polymorphism) technique to investigate the natural variation in DNA methylation of different female's tissues (muscle, gonads, and gills) and early-stage eggs from five populations of the kelp crab Taliepus dentatus, distributed along a latitudinal cline in the coast of Chile. We assessed whether, (1) the distribution of DNA methylation profiles can be associated with the temporal variability of long term (18 years) climatologies (sea surface temperature, turbidity and productivity) and (2) the epigenetic diversity of eggs is related to the population-level phenotypic variability of several maternal investment traits (egg volume, egg weight, egg lipids and fecundity). The DNA methylation of eggs correlated positively and negatively with the long term variability in productivity and sea surface temperature, respectively. Furthermore, the diversity of DNA methylation of eggs correlated positively with the population-level phenotypic variability of several maternal investment traits, suggesting a key role of epigenetic mechanisms in generating phenotypic variability at population level for this species. We provide evidence of a strong link between the temporal variability of long term climatologies with the epigenetic profiles of key early ontogenetic traits associated with the maternal investment of kelp crabs. These modulating mechanisms can hence contribute early to phenotypic variability at population levels in response to local and past environmental fluctuation.
    Mesh-Begriff(e) Animals ; Female ; Brachyura/genetics ; Chile ; DNA Methylation ; Epigenesis, Genetic ; Epigenomics ; Kelp
    Sprache Englisch
    Erscheinungsdatum 2022-11-05
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-23165-1
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel ; Online: Physical-chemical factors influencing the vertical distribution of phototrophic pico-nanoplankton in the Oxygen Minimum Zone (OMZ) off Northern Chile: The relative influence of low pH/low O

    Piscoya, Edson / von Dassow, Peter / Aldunate, Montserrat / Vargas, Cristian A

    Marine environmental research

    2022  Band 180, Seite(n) 105710

    Abstract: The vertical distribution of phytoplankton is of fundamental importance in the structure, dynamic, and biogeochemical pathways in marine ecosystems. Nevertheless, what are the main factors determining this distribution remains as an open question. Here, ... ...

    Abstract The vertical distribution of phytoplankton is of fundamental importance in the structure, dynamic, and biogeochemical pathways in marine ecosystems. Nevertheless, what are the main factors determining this distribution remains as an open question. Here, we evaluated the relative influence of environmental factors that might control the coexistence and vertical distribution of pico-nanoplankton associated with the OMZ off northern Chile. Our results showed that in the upper layer Synechococcus-like cells were numerically important at all sampling stations. Pico-nano eukaryotes and phototrophic nanoflagellates (PNF) also showed high abundances in the upper layer decreasing in abundance down to the upper oxycline, while only Prochlorococcus showed high abundances under oxycline and within the oxygen-depleted layer. Statistical analyses evidenced that temperature, oxygen, and carbonate chemistry parameters (pH and dissolved inorganic carbon, DIC) influenced significantly the vertical distribution of phototrophic pico-nanoplankton. Additionally, we experimentally-evaluated the combined effect of low pH/low O
    Mesh-Begriff(e) Chile ; Ecosystem ; Hydrogen-Ion Concentration ; Oxygen/metabolism ; Seawater/chemistry
    Chemische Substanzen Oxygen (S88TT14065)
    Sprache Englisch
    Erscheinungsdatum 2022-07-31
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 1502505-6
    ISSN 1879-0291 ; 0141-1136
    ISSN (online) 1879-0291
    ISSN 0141-1136
    DOI 10.1016/j.marenvres.2022.105710
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  4. Artikel: Physical-chemical factors influencing the vertical distribution of phototrophic pico-nanoplankton in the Oxygen Minimum Zone (OMZ) off Northern Chile: The relative influence of low pH/low O2 conditions

    Piscoya, Edson / von Dassow, Peter / Aldunate, Montserrat / Vargas, Cristian A.

    Marine environmental research. 2022 Sept., v. 180

    2022  

    Abstract: The vertical distribution of phytoplankton is of fundamental importance in the structure, dynamic, and biogeochemical pathways in marine ecosystems. Nevertheless, what are the main factors determining this distribution remains as an open question. Here, ... ...

    Abstract The vertical distribution of phytoplankton is of fundamental importance in the structure, dynamic, and biogeochemical pathways in marine ecosystems. Nevertheless, what are the main factors determining this distribution remains as an open question. Here, we evaluated the relative influence of environmental factors that might control the coexistence and vertical distribution of pico-nanoplankton associated with the OMZ off northern Chile. Our results showed that in the upper layer Synechococcus-like cells were numerically important at all sampling stations. Pico-nano eukaryotes and phototrophic nanoflagellates (PNF) also showed high abundances in the upper layer decreasing in abundance down to the upper oxycline, while only Prochlorococcus showed high abundances under oxycline and within the oxygen-depleted layer. Statistical analyses evidenced that temperature, oxygen, and carbonate chemistry parameters (pH and dissolved inorganic carbon, DIC) influenced significantly the vertical distribution of phototrophic pico-nanoplankton. Additionally, we experimentally-evaluated the combined effect of low pH/low O₂ conditions on a nanophytoplankton species, the haptophyte Imantonia sp. Under control conditions (pH = 8.1; O₂ = 287.5 μM, light = 169.6 μEm⁻²s⁻¹), Imantonia sp. in vivo fluorescence increased over fifty times, inducing supersaturated O₂ conditions (900 μM) and an increasing pH (8.5), whereas upon an experimental treatment mimicking OMZ conditions (pH = 7.5; O₂ = 55.6 μM; light = 169.6 μEm⁻²s⁻¹), in vivo fluorescence declined dramatically, suggesting that Imantonia sp. did not survive. Although preliminary, our study provides evidence about the role of low pH/low O₂ conditions on the vertical distribution of nanophytoplankton, which deserve future attention through both fieldwork and more extended experimental experiences.
    Schlagwörter Haptophyta ; Prochlorococcus ; carbonates ; eukaryotic cells ; fluorescence ; inorganic carbon ; oxygen ; pH ; phytoplankton ; research ; spatial distribution ; temperature ; Chile
    Sprache Englisch
    Erscheinungsverlauf 2022-09
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ZDB-ID 1502505-6
    ISSN 1879-0291 ; 0141-1136
    ISSN (online) 1879-0291
    ISSN 0141-1136
    DOI 10.1016/j.marenvres.2022.105710
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  5. Artikel ; Online: Antagonistic interplay between pH and food resources affects copepod traits and performance in a year-round upwelling system.

    Aguilera, Victor M / Vargas, Cristian A / Dam, Hans G

    Scientific reports

    2020  Band 10, Heft 1, Seite(n) 62

    Abstract: Linking pH/ ... ...

    Abstract Linking pH/pCO
    Mesh-Begriff(e) Animals ; Body Size ; Carbon Dioxide/chemistry ; Chlorophyll/chemistry ; Chlorophyll/metabolism ; Copepoda/growth & development ; Copepoda/metabolism ; Ecosystem ; Female ; Hydrogen-Ion Concentration ; Ovum/physiology ; Seasons ; Seawater/chemistry ; Temperature
    Chemische Substanzen Chlorophyll (1406-65-1) ; Carbon Dioxide (142M471B3J)
    Sprache Englisch
    Erscheinungsdatum 2020-01-09
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-019-56621-6
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  6. Artikel ; Online: Priorities for progress towards Sustainable Development Goal 14 'Life below water'.

    Lubchenco, Jane / Camp, Emma F / Vargas, Cristian A / Belhabib, Dyhia / Anna, Zuzy / Amon, Diva J / Metaxas, Anna / Harden-Davies, Harriet

    Nature ecology & evolution

    2023  Band 7, Heft 10, Seite(n) 1564–1569

    Mesh-Begriff(e) Water ; Sustainable Development
    Chemische Substanzen Water (059QF0KO0R)
    Sprache Englisch
    Erscheinungsdatum 2023-10-03
    Erscheinungsland England
    Dokumenttyp Journal Article
    ISSN 2397-334X
    ISSN (online) 2397-334X
    DOI 10.1038/s41559-023-02208-4
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  7. Artikel ; Online: Differential gene expression analysis in the scallop Argopecten purpuratus exposed to altered pH and temperature conditions in an upwelling-influenced farming area

    Benítez, Samanta / Figueroa, Alvaro / Lagos, Nelson A. / Silva, Andrea X. / Duarte, Cristian / Vargas, Cristian A. / Lardies, Marco A. / Cárdenas, Leyla

    Comparative Biochemistry and Physiology - Part D: Genomics and Proteomics. 2023 Mar., v. 45 p.101046-

    2023  

    Abstract: Increased carbon dioxide in the atmosphere and its absorption across the ocean surface will alter natural variations in pH and temperature levels, occurring in coastal upwelling ecosystems. The scallop Argopecten purpuratus, one of the most economically ... ...

    Abstract Increased carbon dioxide in the atmosphere and its absorption across the ocean surface will alter natural variations in pH and temperature levels, occurring in coastal upwelling ecosystems. The scallop Argopecten purpuratus, one of the most economically important species farmed in northern Chile, has been shown to be vulnerable to these environmental drivers. However, the regulatory responses at the gene-level of scallops to these climate stressors remain almost unknown. Consequently, we used an orthogonal experimental design and RNAseq approach to analyze the acute effects of variability in pH and temperature on gene expression in the muscle tissue of A. purpuratus. In respect to control conditions (pH ~ 8.0/ 14 °C), the influence of low pH (~ 7.7) and temperature (14 °C) induced the activation of several genes associated with apoptotic signaling pathways and protein localization to plasma membrane. Elevated temperature (18 °C) and pH (~8.0) conditions increased the expression of transcripts associated with the activation of muscle contraction, regulation, and sarcomere organization effects on muscle tissue. In scallops exposed to low pH and elevated temperature, the genes expressed were differentially associated with the oxidation-reduction process, signal translation, and positive regulation of GTPase activity. These results indicated that the differentially expressed genes under the experimental conditions tested are mainly related to the mitigation of cellular damage and homeostasis control. Our results add knowledge about the function of the adductor muscle in response to stressors in scallops. Furthermore, these results could help in the identification of molecular biomarkers of stress necessary to be integrated into the aquaculture programs for the mitigation of climate change.
    Schlagwörter Argopecten purpuratus ; absorption ; apoptosis ; aquaculture ; biomarkers ; carbon dioxide ; climate ; climate change ; experimental design ; gene expression ; gene expression regulation ; genomics ; guanosinetriphosphatase ; homeostasis ; muscle contraction ; muscles ; pH ; plasma membrane ; proteomics ; sarcomeres ; scallops ; temperature ; Chile ; RNAseq approach ; Upwelling
    Sprache Englisch
    Erscheinungsverlauf 2023-03
    Erscheinungsort Elsevier Inc.
    Dokumenttyp Artikel ; Online
    ZDB-ID 2212119-5
    ISSN 1878-0407 ; 1744-117X
    ISSN (online) 1878-0407
    ISSN 1744-117X
    DOI 10.1016/j.cbd.2022.101046
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  8. Artikel ; Online: Differential gene expression analysis in the scallop Argopecten purpuratus exposed to altered pH and temperature conditions in an upwelling-influenced farming area.

    Benítez, Samanta / Figueroa, Álvaro / Lagos, Nelson A / Silva, Andrea X / Duarte, Cristian / Vargas, Cristian A / Lardies, Marco A / Cárdenas, Leyla

    Comparative biochemistry and physiology. Part D, Genomics & proteomics

    2022  Band 45, Seite(n) 101046

    Abstract: Increased carbon dioxide in the atmosphere and its absorption across the ocean surface will alter natural variations in pH and temperature levels, occurring in coastal upwelling ecosystems. The scallop Argopecten purpuratus, one of the most economically ... ...

    Abstract Increased carbon dioxide in the atmosphere and its absorption across the ocean surface will alter natural variations in pH and temperature levels, occurring in coastal upwelling ecosystems. The scallop Argopecten purpuratus, one of the most economically important species farmed in northern Chile, has been shown to be vulnerable to these environmental drivers. However, the regulatory responses at the gene-level of scallops to these climate stressors remain almost unknown. Consequently, we used an orthogonal experimental design and RNAseq approach to analyze the acute effects of variability in pH and temperature on gene expression in the muscle tissue of A. purpuratus. In respect to control conditions (pH ~ 8.0/ 14 °C), the influence of low pH (~ 7.7) and temperature (14 °C) induced the activation of several genes associated with apoptotic signaling pathways and protein localization to plasma membrane. Elevated temperature (18 °C) and pH (~8.0) conditions increased the expression of transcripts associated with the activation of muscle contraction, regulation, and sarcomere organization effects on muscle tissue. In scallops exposed to low pH and elevated temperature, the genes expressed were differentially associated with the oxidation-reduction process, signal translation, and positive regulation of GTPase activity. These results indicated that the differentially expressed genes under the experimental conditions tested are mainly related to the mitigation of cellular damage and homeostasis control. Our results add knowledge about the function of the adductor muscle in response to stressors in scallops. Furthermore, these results could help in the identification of molecular biomarkers of stress necessary to be integrated into the aquaculture programs for the mitigation of climate change.
    Mesh-Begriff(e) Animals ; Ecosystem ; Temperature ; Pectinidae/genetics ; Aquaculture ; Gene Expression Profiling ; Hydrogen-Ion Concentration
    Sprache Englisch
    Erscheinungsdatum 2022-12-01
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2212119-5
    ISSN 1878-0407 ; 1744-117X
    ISSN (online) 1878-0407
    ISSN 1744-117X
    DOI 10.1016/j.cbd.2022.101046
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  9. Artikel: Contrasting land-uses in two small river basins impact the colored dissolved organic matter concentration and carbonate system along a river-coastal ocean continuum

    Curra-Sánchez, Elizabeth D. / Lara, Carlos / Cornejo-D'Ottone, Marcela / Nimptsch, Jorge / Aguayo, Mauricio / Broitman, Bernardo R. / Saldías, Gonzalo S. / Vargas, Cristian A.

    Science of the total environment. 2022 Feb. 01, v. 806

    2022  

    Abstract: Human activities have led to an increase in land use change, with effects on the structure and functioning of ecosystems. The impact of contrasting land uses along river basins on the concentration of colored dissolved organic matter (CDOM) reaching the ... ...

    Abstract Human activities have led to an increase in land use change, with effects on the structure and functioning of ecosystems. The impact of contrasting land uses along river basins on the concentration of colored dissolved organic matter (CDOM) reaching the coastal zone, and its relationship with the carbonate system of the adjacent coastal ocean, is poorly known. To understand the relationship between land use change, CDOM and its influence on the carbonate system, two watersheds with contrasting land uses in southern Chile were studied. The samples were collected at eight stations between river and adjacent coastal areas, during three sampling campaigns in the austral summer and spring. Chemical and biological samples were analyzed in the laboratory according to standard protocols. Landsat 8 satellite images of the study area were used for identification and supervised classification using remote sensing tools. The Yaldad River basin showed 82% of native forest and the Colu River basin around 38% of grassland (agriculture). Low total alkalinity (AT) and Dissolved Inorganic Carbon (DIC), but high CDOM proportions were typically observed in freshwater. A higher CDOM and humic-like compounds concentration was observed along the river-coastal ocean continuum in the Yaldad basin, characterized by a predominance of native forests. In contrast, nutrient concentrations, AT and DIC, were higher in the Colu area. Low CaCO₃ saturation state (ΩAᵣ < 2) and even undersaturation conditions were observed at the coastal ocean at Yaldad. A strong negative correlation between AT, DIC and ΩAᵣ with CDOM/fDOM, suggested the influence of terrestrial material on the seawater carbon chemistry. Our results provide robust evidence that land uses in river basins can influence CDOM/fDOM proportion and its influence on the carbonate chemistry of the adjacent coastal, with potential implications for the shellfish farming activity in this region.
    Schlagwörter Landsat ; alkalinity ; basins ; coasts ; color ; environment ; forests ; freshwater ; grasslands ; humans ; inorganic carbon ; land use change ; rivers ; seawater ; shellfish ; spring ; summer ; watersheds ; Chile
    Sprache Englisch
    Erscheinungsverlauf 2022-0201
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2021.150435
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  10. Artikel ; Online: Upwelling modulation of functional traits of a dominant planktonic grazer during "warm-acid" El Niño 2015 in a year-round upwelling area of Humboldt Current.

    Aguilera, Victor M / Escribano, Ruben / Vargas, Cristian A / González, M Teresa

    PloS one

    2019  Band 14, Heft 1, Seite(n) e0209823

    Abstract: Climate change is expected to exacerbate upwelling intensity and natural acidification in Eastern Boundaries Upwelling Systems (EBUS). Conducted between January-September 2015 in a nearshore site of the northern Humboldt Current System directly exposed ... ...

    Abstract Climate change is expected to exacerbate upwelling intensity and natural acidification in Eastern Boundaries Upwelling Systems (EBUS). Conducted between January-September 2015 in a nearshore site of the northern Humboldt Current System directly exposed to year-round upwelling episodes, this study was aimed at assessing the relationship between upwelling mediated pH-changes and functional traits of the numerically dominant planktonic copepod-grazer Acartia tonsa (Copepoda). Environmental temperature, salinity, oxygen, pH, alkalinity, chlorophyll-a (Chl), copepod adult size, egg production (EP), and egg size and growth were assessed through 28 random oceanographic surveys. Agglomerative clustering and multidimensional scaling identified three main di-similitude nodes within temporal variability of abiotic and biotic variables: A) "upwelling", B) "non-upwelling", and C) "warm-acid" conditions. Nodes A and B represented typical features within the upwelling phenology, characterized by the transition from low temperature, oxygen, pH and Chl during upwelling to higher levels during non-upwelling conditions. However, well-oxygenated, saline and "warm-acid" node C seemed to be atypical for local climatology, suggesting the occurrence of a low frequency oceanographic perturbation. Multivariate (LDA and ANCOVA) analyses revealed upwelling through temperature, oxygen and pH were the main factors affecting variations in adult size and EP, and highlighted growth rates were significantly lower under node C. Likely buffering upwelling pH-reductions, phytoplankton biomass maintained copepod reproduction despite prevailing low temperature, oxygen and pH levels in the upwelling setting. Helping to better explain why this species is among the most recurrent ones in these variable yet productive upwelling areas, current findings also provide opportune cues on plankton responses under warm-acid conditions, which are expected to occur in productive EBUS as a consequence of climate perturbations.
    Mesh-Begriff(e) Animals ; Biomass ; Chlorophyll A/analysis ; Climate Change ; Copepoda/growth & development ; Copepoda/physiology ; Ecosystem ; El Nino-Southern Oscillation/adverse effects ; Hydrogen-Ion Concentration ; Phytoplankton/growth & development ; Plankton/growth & development ; Population Dynamics ; Salinity ; Seasons ; Temperature
    Chemische Substanzen Chlorophyll A (YF5Q9EJC8Y)
    Sprache Englisch
    Erscheinungsdatum 2019-01-14
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0209823
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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