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个人简介
I investigate the impact of changes in environment and climate on living organisms on various time scales, from millions of years to decades, with my focus on benthic foraminifera (eukaryotic unicellular organisms). I study their assemblages, as well as trace element and stable isotopic composition of their shells. Foraminifera live in salt or at least brackish water, so I concentrate on the oceans, from the deep sea up to tidal salt marshes. The deep sea is the largest habitat on Earth, supports a high diversity of organisms, but is one of the least known. I study foraminifera from the deep sea floor, using samples from the International Ocean Discovery Program. I am interested in understanding the development of high-diversity deep-sea faunas through periods of major climate change and mass extinction, such as the mass extinction by meteorite impact at the end of the Cretaceous (66 million years ago), which did not affect benthic foraminifera significantly. I have spent years, but am still working on, benthic faunas in the early Cenozoic extreme warm climates (Paleocene through middle Eocene), specifically looking at the effects of ocean acidification, deoxygenation, and warming (metabolic effects) during the Paleocene-Eocene Thermal Maximum deep-sea extinction and faunal. changes during other hyperthermals events. I am also looking at deep-sea benthic foraminifera during the establishment of the Antarctic ice sheet at the end of the Eocene - beginning of the Oligocene, when the Antarctic ice sheet reached sea level, and during the middle Miocene warm period followed by intensification of glaciation.
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crossref(2024)
Scienceno. 6684 (2024)
crossref(2023)
Johan C. Varekamp, Christina Cauley,Stephen C. Kuehn, Sabrina Koetter, Haley Brumberger,Ellen Thomas
Abstracts with programs - Geological Society of America (2023)
Earth and planetary science letters (2023): 118304-118304
From the Guajira Desert to the Apennines, and from Mediterranean Microplates to the Mexican Killer Asteroid: Honoring the Career of Walter Alvarezpp.449-470, (2022)
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作者统计
#Papers: 266
#Citation: 27357
H-Index: 63
G-Index: 165
Sociability: 7
Diversity: 0
Activity: 1
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