Influence of surface ocean density on planktonic foraminifera calcification

Zarkogiannis, Stergios D.; Antonarakou, Assimina; Tripati, Aradhna; Kontakiotis, George; Mortyn, P. Graham; Drinia, Hara; Greaves, Mervyn

doi:10.1038/s41598-018-36935-7

Cited by 34 publications

(32 citation statements)

References 69 publications

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“…However, the absolute G. bulloides shell mass values for specimens 300-350 µm in size reported here for a tropical Atlantic site are low compared with the North Atlantic records [48,50]. This is consistent with the influence of seawater densities on shell weights [7], as the lowest sea surface density values are found in the tropical waters, where salinity is lowest due to excess rainfall associated with the intertropical convergence zone, and increases toward the poles [51]. At higher latitudes, G. bulloides shell weight changes by around one-third over glacial-interglacial cycles [3,50,52], and a similar variability in test weight is seen through the Pliocene glacial-interglacial cycles at a similar location [48].…”

Section: Discussionsupporting

confidence: 86%

“…The same applies with the reconstructed densities of the water column that reveal lighter waters during the glacial and denser waters after MIS 6.1. Following the previous study [7], shell weights were plotted against the reconstructed seawater density values and a significant (R 2 = 0.43, p < 0.05, n = 12) relationship between these parameters was verified (Figure 5d), which becomes even more significant (R 2 = 0.74, p < 0.01, n = 12) if the (upper right) two heaviest (most contaminated by clay infillings) samples are omitted. It is evident that these two samples of excessive shell weights deviate from the resulting regression line.…”

Section: Resultsmentioning

confidence: 99%

“…Through the years, changes in planktonic foraminifera shell weights have been linked to different biotic and abiotic parameters such as dissolution [2], carbonate ion concentration [3], optimum growth conditions [4], phosphate concentrations [5], temperature [6], or salinity [1], and thus the various studies have used foraminifera shell weights each time as a different proxy. Recent studies have shown that planktonic foraminifera can alter their shell mass according to ambient seawater density [7] and that the degree of this alteration in time is a function of latitude [8].…”

Section: Introductionmentioning

confidence: 99%

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Evidence of Stable Foraminifera Biomineralization during the Last Two Climate Cycles in the Tropical Atlantic Ocean

Zarkogiannis

Antonarakou

Fernández

et al. 2020

JMSE

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Planktonic foraminiferal biomineralization intensity, reflected by the weight of their shell calcite mass, affects global carbonate deposition and is known to follow climatic cycles by being increased during glacial stages and decreased during interglacial stages. Here, we measure the dissolution state and the mass of the shells of the planktonic foraminifera species Globigerina bulloides from a Tropical Eastern North Atlantic site over the last two glacial–interglacial climatic transitions, and we report no major changes in plankton calcite production with the atmospheric pCO2 variations. We attribute this consistency in foraminifera calcification to the climatic and hydrological stability of the tropical regions. However, we recorded increased shell masses midway through the penultimate deglaciation (Termination II). In order to elucidate the cause of the increased shell weights, we performed δ18O, Mg/Ca, and μCT measurements on the same shells from a number of samples surrounding this event. Compared with the lighter ones, we find that the foraminifera of increased weight are internally contaminated by sediment infilling and that their shell masses respond to local surface seawater density changes.

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Section: Discussionsupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evidence of Stable Foraminifera Biomineralization during the Last Two Climate Cycles in the Tropical Atlantic Ocean

Zarkogiannis

Antonarakou

Fernández

et al. 2020

JMSE

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“…Based on calibration between SNW in core-top sediments and bottom-water Δ[CO 3 2− ] in the equatorial Pacific, size-normalized test weights have served as a proxy for deep seawater [CO 3 2− ] (e.g., Broecker & Clark, 2001;Qin et al, 2017). In contrast, the test area density (μg μm −2 ) of foraminifera, which is the ratio of the weight of a test to its projected area, is a more rigorous size-standardized proxy than SNW, and it is also employed as a proxy of calcification intensity controlled by sea surface conditions (e.g., Moy et al, 2009;Weinkauf et al, 2013;Zarkogiannis et al, 2019). Sea surface conditions where foraminifera calcify can influence the thickness of foraminiferal test walls (Marshall et al, 2013) and bulk density (Iwasaki et al, 2019), which implies that the initial weights of foraminiferal tests differ depending on growth conditions as suggested in Barker and Elderfield (2002); thus, the test weight proxies SNW and test area density may be affected by not only dissolution at the deep seafloor but also calcification at the sea surface.…”

Section: Introductionmentioning

confidence: 99%

Micro‐CT Scanning of Tests of Three Planktic Foraminiferal Species to Clarify DissolutionProcess and Progress

Iwasaki

Kimoto

Okazaki

et al. 2019

Geochem Geophys Geosyst

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Evaluation of foraminiferal test dissolution in deep-sea sediments facilitates reconstruction of seawater chemistry. Here we observed test dissolution processes of the planktic foraminifera Trilobatus sacculifer, Globigerinoides ruber, and Neogloboquadrina dutertrei from midlatitudes of the western North Pacific; in these three species, we tested the ability of a new dissolution index using data from X-ray micro-computed tomography scanning. Although the dissolution process of foraminiferal tests differed slightly among species, dissolution of all species was equally assessed by the calcite density distribution (%Low-CT-number calcite volume) calculated from the CT number histogram. In T. sacculifer and G. ruber, the test area density, a conventional proxy for assessing test condition based on weight measurement, is affected by variations in the thickness of the outermost chamber wall; thus, this conventional proxy can be affected by sea surface conditions during test calcification. In contrast, the relationship between the %Low-CT-number calcite volume of tests and the deep seawater calcite saturation state suggests that X-ray micro-computed tomography scanning is applicable for evaluating the intensity of foraminiferal test dissolution at the undersaturated deep seafloor in this area and is an invaluable proxy for detecting deep seawater carbonate ion concentration changes on glacialinterglacial timescales.

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“…Densitas perairan (kombinasi dengan suhu dan salinitas) berkontribusi terhadap sebaran (dispersal) dari larva planktonis biota laut (Marsh et al, 2001). Lebih lanjut, densitas perairan dapat mempengaruhi proses kalsifikasi cangkang plankton foraminifera (Zarkogiannis et al, 2019).…”

Section: Analisis Pca Parameter Fisika Oseanografis Perairanunclassified

Biodiversitas Zooplankton di Perairan Pesisir Pulau Keffing pada Musim Peralihan II, Kabupaten Seram Bagian Timur

Mulyadi

Lekalette

2020

J. Kel. Trop.

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Zooplankton has an important role in thropic ecology at coastal area. According to their ecological function as the first consumer, zooplankton linked between producers (phytoplankton) and other marine organisms in the higher thropic level. The abundance of zooplankton in coastal area can be indicate as secondary productivity and as a food source for fisheries. This study aims to examine the biodiversity of zooplankton in coastal area of Keffing Island, Eastern Seram regency. Sampling was conducted in November 2017 during November (transitional season II) using NORPAC net (mesh size 300 micrometer) with vertical hauling from 10 meter of deep to the surface water. Samples were preserved with 4% formaldehyde and identify in the laboratory. The results showed that the biodiversity of zooplankton during transitional season II was 28 species, which copepods are the dominant taxa (13 species, 46.43% of total zooplankton). The total abundance of zooplankton is 351-1190 individu/m3, which Oncaea sp, Eucalanus sp and Corycaeus sp are abundant. Study biodiversity in coastal area of Keffing Island is important to support fisheries management programs. Avalaibility of data on the composition and abundance of zooplankton can be used as baseline data of secondary productivity and potency of natural food source in coastal area. Zooplankton mempunyai peranan penting dalam jejaring ekologi perairan pesisir. Posisinya sebagai konsumen pertama akan menghubungkan antara produsen dalam hal ini fitoplankton dengan biota pada tingkat tropik level di atasnya. Kelimpahan zooplankton di suatu perairan dapat menggambarkan produktivitas sekunder dan potensialitas pakan alami dari sumberdaya perikanan di suatu perairan. Penelitian ini bertujuan untuk mengkaji biodiversitas zooplankton di perairan pesisir Pulau Keffing, Seram Bagian Timur (SBT). Penelitian ini dilakukan pada bulan November 2017 (musim peralihan II). Pengambilan sampel dilakukan dengan menggunakan jaring NORPAC (mata jaring 300 mikrometer), ditarik secara vertikal dari kedalaman 10 meter menuju permukaan. Sampel dipreservasi menggunakan formalin 4%, dan diidentifikasi di laboratorium. Hasil penelitian menunjukkan bahwa biodiversitas zooplankton selama musim peralihan II sebanyak 28 jenis. Komposisi jenis copepoda mendominasi dengan 13 jenis (46,43% dari total komposisi zooplankton). Kelimpahan Total zooplankton berkisar antara 351-1190 ind/m3. zooplankton yang melimpah dari jenis Oncaea sp., Eucalanus sp. dan Corycaeus sp. Kajian tentang biodiversitas zooplankton di pesisir Pulau Keffing sangat penting untuk mendukung program pengelolaan sumberdaya perikanan. Ketersediaan data komposisi dan kelimpahan zooplankton dapat digunakan sebagai data dasar produktivitas sekunder dan potensi pakan alami di perairan.

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Influence of surface ocean density on planktonic foraminifera calcification

Cited by 34 publications

References 69 publications

Evidence of Stable Foraminifera Biomineralization during the Last Two Climate Cycles in the Tropical Atlantic Ocean

Evidence of Stable Foraminifera Biomineralization during the Last Two Climate Cycles in the Tropical Atlantic Ocean

Micro‐CT Scanning of Tests of Three Planktic Foraminiferal Species to Clarify DissolutionProcess and Progress

Biodiversitas Zooplankton di Perairan Pesisir Pulau Keffing pada Musim Peralihan II, Kabupaten Seram Bagian Timur

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