Multidecadal Changes in Marine Subsurface Oxygenation Off Central Peru During the Last ca. 170 Years

Cardich, Jorge; Sifeddine, A.; Salvatteci, Renato; Romero, Dennis; Zuluaga, Francisco Javier Briceño; Graco, Michelle; Anculle, Tony; Almeida, C.; Gutiérrez, Dimitri

doi:10.3389/fmars.2019.00270

Cited by 19 publications

(44 citation statements)

References 70 publications

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“…Overall, an extreme low-oxygen, even anoxia-tolerant association was found within the OMZ core, a transitional species group was recorded around the lower boundary of the OMZ (>20 µmol kg −1 ), and a cosmopolitan and much more diverse fauna was observed outside the OMZ (e.g. Table 2; Schumacher et al, 2007;Mallon et al, 2012;Caulle et al, 2014). Gupta and Machain-Castillo (1993) 0.2-2 9-90 dysoxic 0-0.2 0-9 suboxic 0 0 anoxic Kaiho (1994) >1.5 >67.5 oxic Baas et al (1998) 0.3-1.5 13.5-67.5 suboxic 0.1-0.3 4.5-13.5 dysoxic <0.1 <4.5 anoxic Bernhard and Sen Gupta (1999) >1 >45 oxic Levin (2003) 0.1-1 5-45 dysoxic Mallon et al (2012) <0.1 <5 microxic Caulle et al 2014…”

Section: Benthic Foraminifera As An Oxygen Proxymentioning

confidence: 98%

“…This conceptual model explains the microhabitat structure of benthic foraminifera in the sediments as driven by the availability of both the organic matter and dissolved oxygen (Van der Zwaan, 1999). A growing number of publications reporting the living (rose-bengal-stained) benthic foraminiferal distributions and their ambient environmental conditions (Phleger and Soutar, 1973;Mackensen and Douglas, 1989;Sen Gupta and Machain-Castillo, 1993;Bernhard et al, 1997;den Dulk et al, 1998;Jannink et al, 1998;Levin et al, 2002;Schumacher et al, 2007;Cardich et al, 2012Cardich et al, , 2015Mallon et al, 2012;Caulle et al, 2014) showed some features in common. First, benthic foraminiferal faunas generally show a low diversity and high population density in oxygen-depleted environments; (2) most but not all living specimens in OMZs were found dwelling in the first 1 or 2 cm of the surface sediments here, even at moderate flux rates of particulate organic matter; (3) species with a thin, porous test wall (e.g.…”

Section: Benthic Foraminifera As An Oxygen Proxymentioning

confidence: 99%

“…Bolivina seminuda Dominant in different OMZs (Phleger and Soutar, 1973;Hermelin and Shimmield, 1990;Bernhard et al, 1997;Ohga and Kitazato, 1997;Gooday et al, 2000;Cardich et al, 2012;Caulle et al, 2014); tolerant to extreme low oxygen <2.5 µmol kg −1 (Mallon, 2012;Cardich et al, 2015); able to use nitrate for respiration (Piña-Ochoa et al, 2010;Glock et al, 2019); better adapted to low oxygen levels compared to other Bolivina species, e.g. B. spissa (Glock et al, 2011); suggested as dysoxic indicator (Kaiho, 1994); used as a proxy for enhanced upwelling during interglacial periods (Heinze and Wefer, 1992) and for dysoxic conditions (Tetard et al, 2017).…”

Section: Species Ecologymentioning

confidence: 99%

“…Dominant in different OMZs (Smith, 1964;Douglas and Heitman, 1979;Bernhard et al, 1997;den Dulk et al, 1998;Jannink et al, 1998;Caulle et al, 2014;Cardich et al, 2015); associated with fresh organic matter input (Caralp, 1989); suggested as dysoxic indicator (Kaiho, 1994); used as a proxy for dysoxic conditions Tetard et al, 2017) and severe hypoxia (McKay et al, 2015;Praetorius et al, 2015).…”

Section: Bulimina Exilismentioning

confidence: 99%

“…Jaccard and Galbraith, 2012;Moffitt et al, 2015;Praetorius et al, 2015). The eastern equatorial Pacific (EEP) has been the focus of various paleoceanographic studies to unravel the dynamics of surface productivity and bottom-water oxygenation (Oberhänsli Z. Erdem et al: Bottom-water deoxygenation at the Peruvian margin et al, 1990;Heinze and Wefer, 1992;Loubere, 1999;Hendy and Pedersen, 2006;Martinez and Robinson, 2010;Moffitt et al, 2014;Scholz et al, 2014;Salvatteci et al, 2016;Tetard et al, 2017;Balestra et al, 2018;Hoogakker et al, 2018;Cardich et al, 2019). The region is characterized by a strong and shallow OMZ maintained as a result of persistent upwelling (Pennington et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Bottom-water deoxygenation at the Peruvian margin during the last deglaciation recorded by benthic foraminifera

et al. 2020

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Abstract. Deciphering the dynamics of dissolved oxygen in the mid-depth ocean during the last deglaciation is essential to understand the influence of climate change on modern oxygen minimum zones (OMZs). Many paleo-proxy records from the eastern Pacific Ocean indicate an extension of oxygen-depleted conditions during the deglaciation, but the degree of deoxygenation has not been quantified to date. The Peruvian OMZ, one of the largest OMZs in the world, is a key area to monitor such changes in near-bottom-water oxygenation in relation to changing climatic conditions. Here, we analysed the potential to use the composition of foraminiferal assemblages from the Peruvian OMZ as a quantitative redox proxy. A multiple regression analysis was applied to a joint dataset of living (rose-bengal-stained, fossilizable calcareous species) benthic foraminiferal distributions from the Peruvian continental margin. Bottom-water oxygen concentrations ([O2]BW) during sampling were used as the dependant variable. The correlation was significant (R2=0.82; p<0.05), indicating that the foraminiferal assemblages are rather governed by oxygen availability than by the deposition of particulate organic matter (R2=0.53; p=0.31). We applied the regression formula to three sediment cores from the northern part of the Peruvian OMZ between 3 and 8∘ S and 997 and 1250 m water depth, thereby recording oxygenation changes at the lower boundary of the Peruvian OMZ. Each core displayed a similar trend of decreasing oxygen levels since the Last Glacial Maximum (LGM). The overall [O2]BW change from the LGM and the Holocene was constrained to 30 µmol kg−1 at the lower boundary of the OMZ.

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Section: Benthic Foraminifera As An Oxygen Proxymentioning

confidence: 98%

Section: Benthic Foraminifera As An Oxygen Proxymentioning

confidence: 99%

Section: Species Ecologymentioning

confidence: 99%

Section: Bulimina Exilismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Bottom-water deoxygenation at the Peruvian margin during the last deglaciation recorded by benthic foraminifera

et al. 2020

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Late Neogene evolution of the Peruvian margin and its ecosystems: a synthesis from the Sacaco record

Ochoa

Salas-Gismondi

DeVries

et al. 2021

Int J Earth Sci (Geol Rundsch)

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The highly productive waters of the Humboldt Current System (HCS) host a particular temperate ecosystem within the tropics, whose history is still largely unknown. The Pisco Formation, deposited during Mio-Pliocene times in the Peruvian continental margin has yielded an outstanding collection of coastal-marine fossils, providing an opportunity to understand the genesis of the HCS ecosystem. We present a comprehensive review, completed with new results, that integrates geological and paleontological data from the last 10 My, especially focusing on the southern East Pisco Basin (Sacaco area). We discuss the depositional settings of the Pisco Formation and integrate new U/Pb radiometric ages into the chronostratigraphic framework of the Sacaco sub-basin. The last preserved Pisco sediments at Sacaco were deposited ~ 4.5 Ma, while the overlying Caracoles Formation accumulated from ~ 2.7 Ma onwards. We identified a Pliocene angular unconformity encompassing 1.7 My between these formations, associated with a regional phase of uplift. Local and regional paleoenvironmental indicators suggest that shallow settings influenced by the offshore upwelling of ventilated and warm waters prevailed until the early Pliocene. We present an extensive synthesis of the late Miocene–Pleistocene vertebrate fossil record, which allows for an ecological characterization of the coastal-marine communities, an assessment of biodiversity trends, and changes in coastal-marine lineages in relation to modern HCS faunas. Our synthesis shows that: (i) typical endemic coastal Pisco vertebrates persisted up to ~ 4.5 Ma, (ii) first modern HCS toothed cetaceans appear at ~ 7–6 Ma, coinciding with a decline in genus diversity, and (iii) a vertebrate community closer to the current HCS was only reached after 2.7 Ma. The genesis of the Peruvian coastal ecosystem seems to be driven by a combination of stepwise transformations of the coastal geomorphology related to local tectonic pulses and by a global cooling trend leading to the modern oceanic circulation system.

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Biogeochemical feedbacks may amplify ongoing and future ocean deoxygenation: a case study from the Peruvian oxygen minimum zone

et al. 2022

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A new box model is employed to simulate the oxygen-dependent cycling of nutrients in the Peruvian oxygen minimum zone (OMZ). Model results and data for the present state of the OMZ indicate that dissolved iron is the limiting nutrient for primary production and is provided by the release of dissolved ferrous iron from shelf and slope sediments. Most of the removal of reactive nitrogen occurs by anaerobic oxidation of ammonium where ammonium is delivered by aerobic organic nitrogen degradation. Model experiments simulating the effects of ocean deoxygenation and warming show that the productivity of the Peruvian OMZ will increase due to the enhanced release of dissolved iron from shelf and slope sediments. A positive feedback loop rooted in the oxygen-dependent benthic iron release amplifies, both, the productivity rise and oxygen decline in ambient bottom waters. Hence, a 1% decline in oxygen supply reduces oxygen concentrations in sub-surface waters of the continental margin by 22%. The trend towards enhanced productivity and amplified deoxygenation will continue until further phytoplankton growth is limited by the loss of reactive nitrogen. Under nitrogen-limitation, the redox state of the OMZ is stabilized by negative feedbacks. A further increase in productivity and transition to sulfidic conditions is only possible if the rate of nitrogen fixation increases drastically under anoxic conditions. Such a transition would lead to a wide-spread accumulation of toxic sulfide with detrimental consequences for fishery yields in the Peruvian OMZ that currently provides a significant fraction of the global fish catch.

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Multidecadal Changes in Marine Subsurface Oxygenation Off Central Peru During the Last ca. 170 Years

Cited by 19 publications

References 70 publications

Bottom-water deoxygenation at the Peruvian margin during the last deglaciation recorded by benthic foraminifera

Bottom-water deoxygenation at the Peruvian margin during the last deglaciation recorded by benthic foraminifera

Late Neogene evolution of the Peruvian margin and its ecosystems: a synthesis from the Sacaco record

Biogeochemical feedbacks may amplify ongoing and future ocean deoxygenation: a case study from the Peruvian oxygen minimum zone

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