Fish scales in sediments from off Callao, central Peru

Díaz-Ochoa, Javier; Lange, Carina B.; Pantoja, Silvio; Lange, Gert J. de; Gutiérrez, Dimitri; Muñoz, Práxedes; Salamanca, Marco

doi:10.1016/j.dsr2.2008.09.015

Cited by 25 publications

(20 citation statements)

References 52 publications

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“…4), which represent similar values to those yielded in previous studies in this bay Vargas et al, 2004;Caniupán et al, 2009, Díaz-Ochoa et al, 2011. Moreover, these values are within the range of those reported for other high-productivity areas in Chile (Thamdrup and Canfield, 1996), and Perú Díaz-Ochoa et al, 2009;Gutiérrez et al, 2011). Research carried out by Valdés et al (2009) and Guiñez et al (2010) in relation to the surface sediments collected at various depths in Mejillones Bay show that the total organic carbon percentage of deep-ocean sediments is particularly sensitive to OMZ intensification.…”

Section: Upwelling Productivity and Oxidizing Markerssupporting

confidence: 90%

Anchovy population and ocean-climatic fluctuations in the Humboldt Current System during the last 700years and their implications

Guíñez

Valdés

Sifeddine

et al. 2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Upwelling Productivity and Oxidizing Markerssupporting

confidence: 90%

Anchovy population and ocean-climatic fluctuations in the Humboldt Current System during the last 700years and their implications

Guíñez

Valdés

Sifeddine

et al. 2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…For instance, off Callao (Peru-Chile Current System) the analysis of a sediment core dated with 210 Pb and 14 C revealed an interval between the late 13th century and the mid-19th century when the strength of the oxygen minimum zone (OMZ) appears to have weakened (Díaz-Ochoa et al, 2009). Concomitantly, fish scale recovery during this interval was minimal (Díaz-Ochoa et al, 2009), similar to what has been recently reported for the area off Pisco in Peru Salvatteci et al, 2012).…”

Section: Introductionsupporting

confidence: 56%

“…Concomitantly, fish scale recovery during this interval was minimal (Díaz-Ochoa et al, 2009), similar to what has been recently reported for the area off Pisco in Peru Salvatteci et al, 2012). Despite the alteration of fish scale integrity by the fluctuation in OMZ strength, which makes species specific paleo-reconstructions difficult (Emeis et al, 2010), the affected sediment horizons may still contain fragmented scales and bones (Díaz-Ochoa et al, 2008) that can be used as proxies for the abundance of fish communities inhabiting the water column.…”

Section: Introductionmentioning

confidence: 49%

Solid phase phosphorus species and preservation of fish remains in marine sediments of areas of high primary productivity and oxygen seasonality (36°S, central South Chile)

Díaz-Ochoa

Pantoja

2014

Geochem. J.

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The main input of phosphorus to the ocean is associated with river runoff, while this element leaves the marine system via burial in the sediments. Solid phase P accumulation is a function of bottom water and surface sediment oxygenation. Theory predicts that suboxic/anoxic sediments act as a source of phosphate, which is released from organic matter and iron oxides, while authigenic precipitation and biogenic apatite preservation are both favored in a phosphate saturated environment. In this paper, we present the results of solid phase phosphorus speciation in sediments collected in central south Chile on the continental shelf off Concepción. This area is characterized by very high biological productivity and the formation of a strong oxygen minimum zone during summer. We found that total solid phase P was dominated by inorganic phases (60%), mostly comprised by iron-bound P and biogenic apatite P. As expected, biogenic apatite P and iron-bound P were negatively correlated and reflected bottom water oxygen fluctuations during the period analyzed (February-September 2009). The biogenic apatite (fish debris) preservation potential was negatively correlated with bottom water dissolved oxygen and its burial averaged 16% of water column's fish production estimated with a trophic dynamic-model that included SeaWIFS-MODIS satellite primary productivity estimations. In spite of intrusions of oxygen in the water column evidenced by the thinning of the oxygen minimum layer in autumn-winter, bottom waters remained suboxic during the studied period and appear to have favored biogenic apatite P (P fish ) preservation. This finding supports the potential of P fish as a paleotracer for fish abundance in areas previously not considered because of the lack of laminated sediments.

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“…The pronounced change in the biogeochemical regime from low productivity during the LIA to higher productivity during the transitional and modern period thereafter is documented by several sedimentary records from the eastern equatorial Pacific (EEP) region and has been dated at ∼ AD 1820 Gutierrez et al, 2009;Díaz-Ochoa et al, 2009Salvatteci et al, 2014a). Similarly, both cores M771-470 from 11 • S and B0405-6 from 14 • S off Pisco show the characteristic coeval pronounced increase in bSi and total N content (Fig.…”

Section: Evolution Of Surface Water Productivity and Nutrient Utilisamentioning

confidence: 96%

Nutrient utilisation and weathering inputs in the Peruvian upwelling region since the Little Ice Age

et al. 2015

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Abstract. For this study two sediment cores from the Peruvian shelf covering the time period between the Little Ice Age (LIA) and present were examined for changes in productivity (biogenic opal concentrations (bSi)), nutrient utilisation (stable isotope compositions of silicon (δ 30 Si opal ) and nitrogen (δ 15 N sed )), as well as in ocean circulation and material transport (authigenic and detrital radiogenic neodymium (ε Nd ) and strontium ( 87 Sr / 86 Sr) isotopes).For the LIA the proxies recorded weak primary productivity and nutrient utilisation reflected by low average bSi concentrations of ∼ 10 %, δ 15 N sed values of ∼ 5 ‰ and intermediate δ 30 Si opal values of ∼ 0.9 ‰. At the same time, the radiogenic isotope composition of the detrital sediment fraction indicates dominant local riverine input of lithogenic material due to higher rainfall in the Andean hinterland. These patterns were most likely caused by permanent El Niño-like conditions characterised by a deeper nutricline, weak upwelling and low nutrient supply. At the end of the LIA, δ 30 Si opal dropped to low values of +0.6 ‰ and opal productivity reached its minimum of the past 650 years. During the following transitional period of time the intensity of upwelling, nutrient supply and productivity increased abruptly as marked by the highest bSi contents of up to 38 %, by δ 15 N sed of up to ∼ 7 ‰, and by the highest degree of silicate utilisation with δ 30 Si opal reaching values of +1.1 ‰. At the same time, detrital ε Nd and 87 Sr / 86 Sr signatures documented increased wind strength and supply of dust to the shelf due to drier conditions. Since about 1870, productivity has been high but nutrient utilisation has remained at levels similar to the LIA, indicating significantly increased nutrient availability.Comparison between the δ 30 Si opal and δ 15 N sed signatures suggests that during the past 650 years the δ 15 N sed signature in the Peruvian upwelling area has to a large extent been controlled by surface water utilisation and not, as previously assumed, by subsurface nitrogen loss processes in the water column, which only had a significant influence during modern times (i.e. since ∼ AD 1870).

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Fish scales in sediments from off Callao, central Peru

Cited by 25 publications

References 52 publications

Anchovy population and ocean-climatic fluctuations in the Humboldt Current System during the last 700years and their implications

Anchovy population and ocean-climatic fluctuations in the Humboldt Current System during the last 700years and their implications

Solid phase phosphorus species and preservation of fish remains in marine sediments of areas of high primary productivity and oxygen seasonality (36°S, central South Chile)

Nutrient utilisation and weathering inputs in the Peruvian upwelling region since the Little Ice Age

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