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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 Aquac. Environ. Interact.
Volume 8 Issue Pages (down) 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 Saavedra, L.M.; Saldias, G.S.; Broitman, B.R.; Vargas, C.A.
Title Carbonate chemistry dynamics in shellfish farming areas along the Chilean coast: natural ranges and biological implications Type
Year 2021 Publication Ices Journal Of Marine Science Abbreviated Journal ICES J. Mar. Sci.
Volume 78 Issue 1 Pages (down) 323-339
Keywords HUMBOLDT CURRENT SYSTEM; OCEAN ACIDIFICATION; PHYSIOLOGICAL ENERGETICS; CONCHOLEPAS-CONCHOLEPAS; TEMPORAL VARIABILITY; SEASONAL VARIABILITY; NORTHERN PATAGONIA; CRASSOSTREA-GIGAS; PACIFIC OYSTER; CHLOROPHYLL-A
Abstract The increasing shellfish aquaculture requires knowledge about nearshore environmental variability to manage sustainably and create climate change adaptation strategies. We used data from mooring time series and in situ sampling to characterize oceanographic and carbonate system variability in three bivalve aquaculture areas located along a latitudinal gradient off the Humboldt Current System. Our results showed pH(T) <8 in most coastal sites and occasionally below 7.5 during austral spring-summer in the lower (-30 degrees S) and central (-37 degrees S) latitudes, related to upwelling. Farmed mussels were exposed to undersaturated (Omega(arag) < 1) and hypoxic (<2 ml l(-1)) waters during warm seasons at -37 degrees S, while in the higher latitude (43 degrees S) undersaturated waters were only detected during colder seasons, associated with freshwater runoff. We suggest that both Argopecten purpuratus farmed at -30 degrees S and Mytilus chilensis farmed at -43 degrees S may enhance their growth during summer due to higher temperatures, lower pCO(2), and oversaturated waters. In contrast, Mytilus galloprovincialis farmed at 37 degrees S grows better during spring-summer, following higher temperatures and high pCO(2). This knowledge is relevant for aquaculture, but it must be improved using high-resolution time series and in situ experimentation with farmed species to aid their adaptation to climate change and ocean acidification.
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 1054-3139 ISBN Medium
Area Expedition Conference
Notes WOS:000648942600027 Approved
Call Number UAI @ alexi.delcanto @ Serial 1414
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Author Vargas, C.A.; Lagos, N.A.; Lardies, M.A.; Duarte, C.; Manriquez, P.H.; Aguilera, V.M.; Broitman, B.; Widdicombe, S.; Dupont, S.
Title Species-specific responses to ocean acidification should account for local adaptation and adaptive plasticity Type
Year 2017 Publication Nature Ecology & Evolution Abbreviated Journal Nat. Ecol. Evol.
Volume 1 Issue 4 Pages (down) 7 pp
Keywords
Abstract Global stressors, such as ocean acidification, constitute a rapidly emerging and significant problem for marine organisms, ecosystem functioning and services. The coastal ecosystems of the Humboldt Current System (HCS) off Chile harbour a broad physical-chemical latitudinal and temporal gradient with considerable patchiness in local oceanographic conditions. This heterogeneity may, in turn, modulate the specific tolerances of organisms to climate stress in species with populations distributed along this environmental gradient. Negative response ratios are observed in species models (mussels, gastropods and planktonic copepods) exposed to changes in the partial pressure of CO2 (p(CO2)) far from the average and extreme P-CO2 levels experienced in their native habitats. This variability in response between populations reveals the potential role of local adaptation and/or adaptive phenotypic plasticity in increasing resilience of species to environmental change. The growing use of standard ocean acidification scenarios and treatment levels in experimental protocols brings with it a danger that inter-population differences are confounded by the varying environmental conditions naturally experienced by different populations. Here, we propose the use of a simple index taking into account the natural p(CO2) variability, for a better interpretation of the potential consequences of ocean acidification on species inhabiting variable coastal ecosystems. Using scenarios that take into account the natural variability will allow understanding of the limits to plasticity across organismal traits, populations and species.
Address [Vargas, Cristian A.] Univ Concepcion, Fac Environm Sci, Dept Aquat Syst, Concepcion 4030000, Chile, Email: crvargas@udec.cl
Corporate Author Thesis
Publisher Nature Publishing Group Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2397-334x ISBN Medium
Area Expedition Conference
Notes WOS:000417171500009 Approved
Call Number UAI @ eduardo.moreno @ Serial 809
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Author Navarrete, S.A.; Barahona, M.; Weidberg, N.; Broitman, B.R.
Title Climate change in the coastal ocean: shifts in pelagic productivity and regionally diverging dynamics of coastal ecosystems Type
Year 2022 Publication Proceedings Of The Royal Society B-Biological Sciences Abbreviated Journal Proc. R. Soc. B-Biol. Sci.
Volume 289 Issue 1970 Pages (down)
Keywords benthic-pelagic coupling; bottom-up regulation; climate change; population regulation; Humboldt Upwelling Ecosystem; stock-recruitment and storage
Abstract Climate change has led to intensification and poleward migration of the Southeastern Pacific Anticyclone, forcing diverging regions of increasing, equatorward and decreasing, poleward coastal phytoplankton productivity along the Humboldt Upwelling Ecosystem, and a transition zone around 31 degrees S. Using a 20-year dataset of barnacle larval recruitment and adult abundances, we show that striking increases in larval arrival have occurred since 1999 in the region of higher productivity, while slower but significantly negative trends dominate poleward of 30 degrees S, where years of recruitment failure are now common. Rapid increases in benthic adults result from fast recruitment-stock feedbacks following increased recruitment. Slower population declines in the decreased productivity region may result from aging but still reproducing adults that provide temporary insurance against population collapses. Thus, in this region of the ocean where surface waters have been cooling down, climate change is transforming coastal pelagic and benthic ecosystems through altering primary productivity, which seems to propagate up the food web at rates modulated by stock-recruitment feedbacks and storage effects. Slower effects of downward productivity warn us that poleward stocks may be closer to collapse than current abundances may suggest.
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 0962-8452 ISBN Medium
Area Expedition Conference
Notes WOS:000766140800008 Approved
Call Number UAI @ alexi.delcanto @ Serial 1687
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