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#Foraminifera

2 posts2 participants0 posts today
Lukas VFN 🇪🇺

Ancient marine organism's dual-layer structure reveals both past and present ocean environments phys.org/news/2025-02-ancient-

A cosmopolitan calcifying benthic #foraminifera in agglutinated disguise as a geochemical recorder of coastal environments pnas.org/doi/10.1073/pnas.2413

"This species has a remarkable hidden feature—an inner shell made of calcium carbonate beneath its outer layer of gathered particles... [this] made them an excellent recorder of environmental conditions."

#Protists#Microbes
Niels de Winter

Exploring macroevolutionary links in multi-species #planktonic #foraminifera Mg∕Ca and stable #oxygen #isotope from 15 Ma to recent @EGU_BioGeo bg.copernicus.org/articles/22/

bg.copernicus.orgExploring macroevolutionary links in multi-species planktonic foraminiferal Mg∕Ca and δ18O from 15 Ma to recentAbstract. The ratio of the trace element Mg over Ca (Mg/Ca) and the oxygen isotopic composition (δ18O) of foraminiferal calcite are widely employed for reconstructing past ocean temperatures, although geochemical signals are also influenced by several other factors that vary temporally and spatially. Here, we analyse a global dataset of Mg/Ca and δ18O data of 59 middle Miocene to recent species of planktonic foraminifera from a wide range of depth habitats, many of which have never been analysed before for Mg/Ca. We investigate the extent to which Mg/Ca and δ18O covary through time and space and identify several sources of mismatch between the two proxies. Once the data are adjusted for long-term non-thermal factors, Mg/Ca and δ18O are overall positively correlated in a way consistent with temperature being the dominant controller through both space and time and across many different species, including deep dwellers. However, we identify several species with systematic offsets in Mg/Ca values, to which multispecies calibrations should be applied with caution. We can track the appearance of such offsets through ancestor-descendent species over the last 15 Myr and propose that the emergence of these offsets may be the geochemical expression of evolutionary innovations. We find that virtually all of the Mg/Ca- and δ18O-derived temperatures from the commonly used genera Globigerinoides and Trilobatus are within uncertainty of each other, highlighting the utility of these species for paleoceanographic reconstructions. Our results highlight the potential of leveraging information from species lineages to improve sea surface temperature reconstruction from planktonic foraminifera over the Cenozoic.
Lukas VFN 🇪🇺

New research on #protists sheds light on #DeepSea energy sources whoi.edu/press-room/news-relea

Array of metabolic pathways in kleptoplastidic #foraminifera supports #chemoautotrophy in dark, euxinic seafloor sediments academic.oup.com/ismej/article by Fatma Gomaa et al.

"This species takes up unrelated organism’s #chloroplasts — #organelles that perform #photosynthesis... We know #kleptoplasty is happening here, but we needed to understand why this foraminifer is so successful in the dark, without oxygen"

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