Pachauri, R. K. & Meyer, L. A. Intergovernmental panel on climate change (IPCC). In Climate Change 2014: Synthesis Report. Contribution of Working Groups I, II and III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (2014).
Feely, R. A., Sabine, C. L., Hernández-Ayon, J. M., Ianson, D. & Hales, B. Evidence for upwelling of corrosive “acidified” water onto the continental shelf. Science 320, 1490–1492 (2008).
Escribano, R., Hidalgo, P. & Krautz, C. Zooplankton associated with the oxygen minimum zone system in the northern upwelling region of Chile during March 2000. Deep Sea Res. II 56, 1083–1094 (2009).
Paulmier, A. & Ruiz-Pino, D. Oxygen minimum zones (OMZs) in the modern ocean. Prog. Oceanogr. 80, 113–128 (2009).
Ulloa, O., Canfield, D. E., DeLong, E. F., Letelier, R. M. & Stewart, F. J. Microbial oceanography of anoxic oxygen minimum zones. Proc. Natl. Acad. Sci. 109, 15996–16003 (2012).
Thamdrup, B., Dalsgaard, T. & Revsbech, N. P. Widespread functional anoxia in the oxygen minimum zone of the eastern South Pacific. Deep Sea Res. I 65, 36–45 (2012).
Chan, F. et al. Emergence of anoxia in the California current large marine ecosystem. Science 319, 920–920 (2008).
Diaz, R. J. & Rosenberg, R. Spreading dead zones and consequences for marine ecosystems. Science 321, 926–929 (2008).
Friederich, G. E., Ledesma, J., Ulloa, O. & Chavez, F. P. Air–sea carbon dioxide fluxes in the coastal southeastern tropical Pacific. Prog. Oceanogr. 79, 156–166 (2008).
Feely, R. A. et al. The combined effects of ocean acidification, mixing, and respiration on pH and carbonate saturation in an urbanized estuary. Estuar. Coast. Shelf Sci. 88, 442–449 (2010).
Torres, R. et al. Air-sea CO2 fluxes along the coast of Chile: From CO2 outgassing in central northern upwelling waters to CO2 uptake in southern Patagonian fjords. J. Geophys. Res. 116, C09006. https://doi.org/10.1029/2010JC006344 (2011).
Vargas, C. A. et al. Influences of riverine and upwelling waters on the coastal carbonate system off Central Chile and their ocean acidification implications. J. Geophys. Res. Biogeosci. 121, 15. https://doi.org/10.1002/2015JG003213 (2016).
Vargas, C. A. et al. Species-specific responses to ocean acidification should account for local adaptation and adaptive plasticity. Nat. Ecol. Evol. 1, 0084. https://doi.org/10.1038/s41559-017-0084 (2017).
Booth, J. A. et al. Natural intrusions of hypoxic, low pH water into nearshore marine environments on the California coast. Cont. Shelf Res. 45, 108–115 (2012).
Forward, R. B. Diel vertical migration: zooplankton photobiology and behaviour. Oceanogr. Mar. Biol. Annu. Rev 26, 1–393 (1988).
Cohen, J. H. & Forward, R. B. Jr. Zooplankton diel vertical migration: A review of proximate control. Oceanogr. Mar. Biol. Ann. Rev 47, 77–110 (2009).
Brinton, E. Vertical migration and avoidance capability of euphausiids in the California current. Limnol. Oceanogr. 12, 451–483 (1967).
McQuinn, I. H., Dion, M. & St. Pierre, J.-F. The acoustic multifrequency classification of two sympatric euphausiid species (Meganyctiphanes norvegica and Thysanoessa raschii), with empirical and SDWBA model validation. ICES J. Mar. Sci. 70, 636–649 (2013).
Tremblay, N. & Abele, D. Response of three krill species to hypoxia and warming: An experimental approach to oxygen minimum zones expansion in coastal ecosystems. Mar. Ecol. 37, 179–199 (2016).
Ambriz-Arreola, I. et al. Vertical pelagic habitat of euphausiid species assemblages in the Gulf of California. Deep Sea Res. I 123, 75–89 (2017).
Cooper, H. L., Potts, D. & Paytan, A. Metabolic responses of the North Pacific krill, Euphausia pacifica, to short- and long-term pCO2 exposure. Mar. Biol. 163, 207 (2016).
Seibel, B. A., Schneider, J. L., Kaartvedt, S., Wishner, K. F. & Daly, K. L. Hypoxia tolerance and metabolic suppression in Oxygen Minimum Zone euphausiids: Implications for ocean deoxygenation and biogeochemical cycles. Integr. Comp. Biol. 56, 510–523 (2016).
Barry, J. P., Hall-Spencer, J. M. & Tyrrell, T. In Guide to Best Practices for Ocean Acidification Research and Data Reporting (eds. Riebesell, U., Fabry, V. J., Hansson, L. & Gattuso, J. P.) 53–66 (Publications Office of the European Union, 2010).
Paulmier, A., Ruiz-Pino, D., Garçon, V. & Farías, L. Maintaining of the eastern south Pacific oxygen minimum zone (OMZ) off Chile. Geophys. Res. Lett. 33, L20601 (2006).
Stramma, L., Johnson, G. C., Sprintall, J. & Mohrholz, V. Expanding oxygen-minimum zones in the tropical oceans. Science 320, 655–658 (2008).
Gilly, W. F., Beman, J. M., Litvin, S. Y. & Robison, B. H. Oceanographic and biological effects of shoaling of the oxygen minimum zone. Ann. Rev. Mar. Sci. 5, 393–420 (2013).
Garcia-Robledo, E. et al. Cryptic oxygen cycling in anoxic marine zones. Proc. Natl. Acad. Sci. USA 114, 8319–8324 (2017).
Bianchi, D., Galbraith, E. D., Carozza, D. A., Mislan, K. A. S. & Stock, C. A. Intensification of open-ocean oxygen depletion by vertically migrating animals. Nat. Geosci. 6, 545–548 (2013).
Wishner, K. F. et al. Ocean deoxygenation and zooplankton: Very small oxygen differences matter. Sci. Adv. 4, eaa518 (2018).
Kawaguchi, S. et al. Will krill fare well under Southern Ocean acidification?. Biol. Lett. 7, 288–291 (2011).
Sperfeld, E., Mangor-Jensen, A. & Dalpadado, P. Effect of increasing seawater pCO2 on the northern Atlantic krill species Nyctiphanes couchii. Mar. Biol. 165, 116. https://doi.org/10.1007/s00227-018-3370-7 (2014).
Cooper, H. L., Potts, D. C. & Paytan, A. Effects of elevated pCO2 on the survival, growth, and moulting of the Pacific krill species, Euphausia pacifica. ICES J. Mar. Sci. 74, 1005–1012. https://doi.org/10.1093/icesjms/fsw021 (2017).
Ericson, J. A. et al. Adult Antarctic krill proves resilient in a simulated high CO2 ocean. Commun. Biol. 1, 190 (2018).
Opstad, I. et al. Effects of high pCO2 on the northern krill Thysanoessa inermis in relation to carbonate chemistry of its collection area, Rijpfjorden. Mar. Biol. 165, 116 (2018).
Powers, E. B. The physiology of the respiration of fishes relation to the hydrogen ion concentration of the medium. J. Gen. Physiol. 4, 305–317 (1922).
Mayol, E., Ruiz-Halpern, S., Duarte, C. M., Castilla, J. C. & Pelegrí, J. L. Coupled CO2 and O2-driven compromises to marine life in summer along the Chilean sector of the Humboldt Current System. Biogeosciences 9, 1183–1194 (2012).
González, H. E., Ortiz, V. C. & Sobarzo, M. The role of faecal material in the particulate organic carbon flux in the northern Humboldt Current, Chile (23 S), before and during the 1997–1998 El Niño. J. Plankton Res. 22, 499–529 (2000).
González, H. E. et al. Carbon fluxes within the epipelagic zone of the Humboldt Current System off Chile: The significance of euphausiids and diatoms as key functional groups for the biological pump. Progr. Oceanogr. 83, 217–227 (2009).
Dagg, M. J., Jackson, G. A. & Checkley, D. M. The distribution and vertical flux of fecal pellets from large zooplankton in Monterey Bay and coastal California. Deep Sea Res. 94, 72–86 (2014).
Sato, M., Dower, J. F., Kunze, E. & Dewey, R. Second-order seasonal variability in diel vertical migration timing of euphausiids in a coastal inlet. Mar. Ecol. Prog. Ser. 480, 39–56 (2013).
Platt, S. A. & Sanislow, C. A. Norm-of-reaction: Definition and misinterpretation of animal research. J. Comp. Psychol. 102, 254–261 (1988).
Wishner, K. F., Outram, D. M., Seibel, B. A., Daly, K. & Williams, R. L. Zooplankton in the Eastern Tropical North Pacific: Boundary effects of oxygen minimum zone expansion. Deep Sea Res. I 79, 122–140 (2013).
Dickson, A. G., Afghan, J. D. & Anderson, G. C. Reference materials for oceanic CO2 analysis: A method for the certification of total alkalinity. Mar. Chem. 80, 185–197 (2003).
Pierrot, D.E., Lewis, E. & Wallace, D.W.R. MS Excel program developed for CO2system calculations. Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy (2006). https://cdiac.ornl.gov/ftp/co2sys.
Mehrbach, C., Culberson, C., Hawley, J. & Pytkovicz, R. Measurement of the apparent dissociation constants of carbonic acid in seawater at atmospheric pressure. Limnol. Oceanogr. 18, 897–907 (1973).
Dickson, A. G. & Millero, F. J. A comparison of the equilibrium constants for the dissociation of carbonic acid in seawater media. Deep Sea Res. 34, 1733–1743 (1987).
Dickson, A. G. Standard potential of the reaction: AgCl(s) + 12 H 2 (g) 1⁄4 Ag(s) + HCl (aq), and the standard acidity constant of the ion HSO in synthetic seawater from 273.15 to 318.15 K. J. Chem. Thermodyn. 22, 113–127 (1990).
Mitson, R. B. Underwater noise of research vessels: Review and recommendations. ICES Coop. Res. Rep. 209, 61 (1995).
Simrad. Simrad ER60 scientific echo sounder manual. Reference Manual. Release 2.2.0, Kongsberg Maritime AS, Norway, 226 (2008).
Mair, A., Fernandes, P., Lebourges-Dhaussy, A. & Brierley, A. An investigation into the zooplankton composition of a prominent 38-khz scattering layer in the North Sea. J. Plank. Res. 27, 623–633 (2005).
Cade, D. E. & Benoit-Bird, K. J. Depths, migration rates and environmental associations of acoustic scattering layers in the Gulf of California. Deep Sea Res. I 102, 78–89 (2015).
Sato, M. et al. Impacts of moderate hypoxia on fish and zooplankton prey distributions in a coastal fjord. Mar. Ecol. Prog. Ser 560, 57–72 (2016).
Pérez-Santos, I. et al. Turbulence and hypoxia contribute to dense biological scattering layers in a Patagonian fjord system. Ocean Sci. 14, 1185–1206 (2018).
Díaz-Astudillo, M., Cáceres, M. & Landaeta, M. Zooplankton structure and vertical migration: Using acoustics and biomass to compare stratified and mixed fjord systems. Cont. Shelf Res 148, 208–218 (2017).
MacLennan, D. N., Fernandez, P. G. & Dalen, J. A consistent approach to definitions and symbols in fisheries acoustics, ICES. J. Mar. Sci. 59, 365–369 (2002).
Ballón, M. et al. Is there enough zooplankton to feed forage fish populations off Peru? An acoustic (positive) answer. Prog. Oceanogr. 91, 360–381 (2011).
Clarke, K.R. & Gorley, R.N. PRIMER v7: User Manual/Tutorial PRIMER-E: Plymouth (2015).
Kloser, R. J., Ryan, T., Sakov, P., Williams, A. & Koslow, J. A. Species identification in deep water using multiple acoustic frequencies. Can. J. Fish. Aquat. Sci. 59, 1065–1077 (2002).
Werner, T. & Buchholz, F. Diel vertical migration behaviour in Euphausiids of the northern Benguela current: Seasonal adaptations to food availability and strong gradients of temperature and oxygen. J. Plankton Res. 35, 792–812 (2013).
Bertrand, A., Ballón, M. & Chaigneau, A. Acoustic observation of living organisms reveals the upper limit of the oxygen minimum zone. PLoS ONE 5(4), e10330 (2010).
McLaskey, A. K. et al. Development of Euphausia pacifica (krill) larvae is impaired under pCO2 levels currently observed in the Northeast Pacific. Mar. Ecol. Prog. Ser. 555, 65–78 (2016).
Flores, H. et al. Impact of climate change on Antarctic krill. Mar. Ecol. Prog. Ser. 458, 1–19 (2012).
Brewer, P. G. & Peltzer, E. T. Limits to marine life. Science 324, 347–348 (2009).
Montgomery, D. W. et al. Rising CO2 enhances hypoxia tolerance in a marine fish. Sci. Rep. 9, 15152 (2019).
Kiko, R., Hauss, H., Buchholz, F. & Melzner, F. Ammonium excretion and oxygen respiration of tropical copepods and euphausiids exposed to oxygen minimum zone conditions. Biogeosciences 13, 2241–2255 (2016).
Antezana, T. Adaptive behaviour of Euphausia mucronata in relation to the oxygen minimum layer of the Humboldt Current. In Oceanography of the Eastern Pacific (ed. J. Farber), vol. 2, 29–40 (2002).
Torres, J. J. & Childress, J. J. Relationship of oxygen consumption to swimming speed in Euphausia pacifica. Mar. Biol. 74, 79–86 (1983).
Anderson, M.J., Gorley R.N. & Clarke K.R. PERMANOVA+ for PRIMER: Guide to Software and Statistical Methods. PRIMER-E: Plymouth, UK (2008)
Hansen, H.P. & Koroleff, F. Determination of nutrients. In Methods sof Seawater Analysis (eds. K. Grasshoff, K. Kremling & M. Ehrhardt) 159–228 https://doi.org/10.1002/9783527613984.ch10 (2007).
Tremblay, N., Hünerlage, K. & Werner, T. Hypoxia tolerance of 10 Euphausiid species in relation to vertical temperature and oxygen gradients. Front. Physiol. 11, 248. https://doi.org/10.3389/fphys.2020.00248 (2020).
Tremblay, N., Gómez-Gutiérrez, J., Zenteno-Savín, T., Robinson, C. & Sánchez-Velascoa, L. Role of oxidative stress in seasonal and daily vertical migration of three krill species in the Gulf of California. Limnol. Oceanogr. 55, 2570–2584 (2010).
Herrera, I. et al. Vertical variability of Euphausia distinguenda metabolic rates during diel migration into the oxygen minimum layer of the Eastern Tropical Pacific off Mexico. J. Plankton Res. 41, 165–176 (2019).
Hernández-León, S., Calles, S. & Fernández de Puelles, M. L. The estimation of metabolism in the mesopelagic zone: Disentangling deep-sea zooplankton respiration. Progr. Oceanogr. 178, 102163 (2019).
Hernández-León, S. et al. Carbon export through zooplankton active flux in the Canary Current. J. Mar. Syst. 189, 12–21 (2019).
Baker, A. de C., Boden, B.P. & Brinton, E. A Practical Guide to the Euphausiids of the World. British Museum (Natural History), London, 96 pp. (1990).
Alegría, N., Arana, P.M. & Sepúlveda, A. Hydroacoustic survey around Elephant Island (Sub-area 48.1) and South Orkney Islands (Subarea 48.2), austral summer 2016. 2017 IEEE/OES Acoustics in Underwater Geosciences Symposium (RIO Acoustics), 5 pp. (2017).
Ryan, T. E., Downie, R. A., Kloser, R. J. & Keith, G. Reducing bias due to noise and attenuation in open-ocean echo integration data. ICES J. Mar. Sci. 72, 2482–2493 (2015).
De Robertis, A. & Higginbottom, I. A post-processing technique to estimate the signal-to-noise ratio and remove echosounder background noise. ICES J. Mar. Sci. 64, 1282–1291 (2007).
Hewitt, R. P. & Demer, D. A. The use of acoustic sampling to estimate the dispersion and abundance of euphausiids, with an emphasis on Antarctic krill (Euphausia superba). Fish. Res. 47, 215–229 (2000).
Watkins, J. & Brierley, A. Verification of the acoustic techniques used to identify Antarctic krill. ICES J. Mar. Sci. 59, 1326–1336 (2002).
Simmonds, E. & MacLennan, D. Observation and measurement of fish. In Fisheries Acoustics: Theory and Practice (ed. Pitcher, T. J.) 163–215 (Blackwell Science, Oxford, UK, 2005).
Reiss, C. S., Cossio, A. M., Loeb, V. & Demer, D. A. Variations in the biomass of Antarctic krill (Euphausia superba) around the South Shetland Islands, 1996–2006. ICES J. Mar. Sci. 65, 497–508 (2008).
Santora, J. A. et al. Submarine canyons represent an essential habitat network for krill hotspots in a Large Marine Ecosystem. Sci. Rep. 8, 7579 (2018).
Hartin, C. A., Bond-Lamberty, B., Patel, P. & Mundra, A. Ocean acidification over the next three centuries using a simple global climate carbon-cycle model: projections and sensitivities. Biogeosciences 13, 4329–4342 (2016).
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