نتایج جستجو برای: foraminifer
تعداد نتایج: 296 فیلتر نتایج به سال:
Benthic foraminifera are single-celled eukaryotes that make a protective organic, agglutinated or calcareous test. Some agglutinated, single-chambered taxa, including Psammophaga Arnold, 1982, retain mineral particles in their cytoplasm, but the selective mechanism of accumulation is not clear. Here, we report the ability of a foraminiferal species to select and accumulate zircons and other hea...
Some shallow water benthic foraminifera are able to retain functional chloroplasts (kleptoplasts) from their food source, i.e. diatoms. Here we assessed the functionality of the kleptoplast xanthophyll cycle (XC, i.e. the main diatom short-term photo-regulation mechanism) and we surveyed Haynesina germanica kleptoplast pigment composition over time and at different light regimes. Six common dia...
The sulfur content of planktonic and benthic foraminifera was measured in specimens recovered from deep-sea sediment cores and individuals grown in culture. A new method for measuring sulfur in foraminiferal calcium carbonate was developed, employing a high-resolution inductively coupled plasma-mass spectrometer. The sulfur measurements, expressed as sulfur-to-calcium (S/Ca) ratios in the foram...
The timing of the separation Lake Bafa from Aegean Sea and subsequent transition to a freshwater lake is matter debate, uncertainty intervals proposed dates for these changes are quite wide in latest study that utilizes state-of-the-art techniques. By proposing new approach form hierarchical Bayesian change point analysis analyzing paleoenvironmental data, this aims provide objectively selected...
Coiling direction is a basic characteristic of trochospiral planktic foraminifera. Modifications in the coiling within ancient foraminiferal populations may reflect important changes evolution or environment, yet they remain scarcely discussed. Here we investigate fluctuations Morozovella assemblages from sections that span interval peak Cenozoic warmth, Early Eocene Climatic Optimum (EECO; ~53...
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