Chromotypes of Globigerinoides ruber in surface sediments from the north-western coast of the Bay of Bengal

Bhattacharjee, Dola; Sharma, Charu; Bhadury, Punyasloke

doi:10.1017/s1755267213001097

Cited by 8 publications

(2 citation statements)

References 20 publications

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“…The pink chromotype disappeared from the Indian Ocean ca. 120 kyr BP (Thompson et al, ), although it has recently been reported in modern Indian Ocean sediments (Bhattacharjee et al, ).…”

Section: Introductionmentioning

confidence: 97%

Considerations for Globigerinoides ruber (White and Pink) Paleoceanography: Comprehensive Insights From a Long‐Running Sediment Trap

Richey

Thirumalai

Khider

et al. 2019

Paleoceanog and Paleoclimatol

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We present a detailed analysis of the seasonal distribution, size, morphological variability, and geochemistry of co‐occurring pink and white chromotypes of Globigerinoides ruber from a high‐resolution (1–2 weeks) and long‐running sediment trap time series in the northern Gulf of Mexico. We find no difference in the seasonal flux of the two chromotypes. Although flux of G. ruber is consistently lowest in winter, the flux‐weighted signal exported to marine sediments represents mean annual conditions in the surface mixed layer. We observe the same morphological diversity among pink specimens of G. ruber as white. Comparison of the oxygen and carbon isotopic composition (δ18O and δ13C) of two morphotypes (sensu stricto and sensu lato) of pink G. ruber reveals the isotopes to be indistinguishable. The test size distribution within the population varies seasonally, with the abundance of large individuals increasing (decreasing) with increasing (decreasing) sea surface temperature. We find no systematic offsets in the Mg/Ca and δ18O of co‐occurring pink and white G. ruber. The sediment trap data set shows that the Mg/Ca‐temperature sensitivity for both chromotypes is much lower than the canonical 9%/°C, which can likely be attributed to the secondary influence of both salinity and pH on foraminiferal Mg/Ca. Using paired Mg/Ca and δ18O, we evaluate the performance of a suite of published equations for calculating sea surface temperature, sea surface salinity, and isotopic composition of seawater (δ18Osw), including a new salinity‐δ18Osw relationship for the northern Gulf of Mexico from water column observations.

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“…The pink chromotype disappeared from the Indian Ocean ca. 120 kyr BP (Thompson et al, ), although it has recently been reported in modern Indian Ocean sediments (Bhattacharjee et al, ).…”

Section: Introductionmentioning

confidence: 97%

Considerations for Globigerinoides ruber (White and Pink) Paleoceanography: Comprehensive Insights From a Long‐Running Sediment Trap

Richey

Thirumalai

Khider

et al. 2019

Paleoceanog and Paleoclimatol

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“…Thompson et al (1979) showed that the pink chromotype is geographically restricted to the Atlantic Ocean and its marginal seas (Caribbean and Mediterranean Sea), having disappeared from the Indo-Pacific at approximately 120 ka. However, Bhattacharjee et al (2013) reported pink specimens from surface sediments in the north-western Bay of Bengal (Indian Ocean), attributing its re-emergence to the number of climate-driven environmental changes in the area. Morard et al (2019) recently assigned the pink and white variants to G. ruber ruber and G. ruber albus, respectively.…”

Section: Introductionmentioning

confidence: 99%

Globigerinoides rublobatus – a new species of Pleistocene planktonic foraminifera

Latas¹,

Pearson²,

Poole³

et al. 2023

J. Micropalaeontol.

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Abstract. We describe Globigerinoides rublobatus n. sp., a new morphospecies of fossil planktonic foraminifera, from the Pleistocene sediments (∼810 ka) of the Indian Ocean and Pacific Ocean. We use image analysis and morphometry of 860 specimens from International Ocean Discovery Program Site U1483 in the tropical Indian Ocean to document morphological variability in the new morphospecies and related taxa, and we also report it from Pacific Ocean Site U1486 for the first time. The new morphospecies combines characteristics typical of Globigerinoides conglobatus (Brady, 1879) and Globigerinoides ruber (d'Orbigny, 1839), with which it co-occurs, but is distinct from both. Morphometric data indicate that G. rublobatus n. sp. is closer to G. conglobatus, potentially signalling an evolutionary affinity. We find that Globigerinoides rublobatus n. sp. occurs as two variants, a pigmented (pink) form and a non-pigmented (white) form. The non-pigmented forms are on average ∼50 % larger than the pigmented forms. This is so far only the third instance of fossil planktonic foraminifera known to exhibit this pink pigmentation. We regard the pink and white forms as variants of a single morphospecies and suggest the pink form may represent a later evolutionary adaptation.

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Modern benthic foraminiferal assemblages from the world’s largest deltaic mangrove ecosystem, the Sundarbans

et al. 2015

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Chromotypes of Globigerinoides ruber in surface sediments from the north-western coast of the Bay of Bengal

Cited by 8 publications

References 20 publications

Considerations for Globigerinoides ruber (White and Pink) Paleoceanography: Comprehensive Insights From a Long‐Running Sediment Trap

Considerations for Globigerinoides ruber (White and Pink) Paleoceanography: Comprehensive Insights From a Long‐Running Sediment Trap

Globigerinoides rublobatus – a new species of Pleistocene planktonic foraminifera

Modern benthic foraminiferal assemblages from the world’s largest deltaic mangrove ecosystem, the Sundarbans

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