Deep sea biotic responses during ocean anoxia in the Southern high latitudes

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Trine Edvardsen


DKK 350,000




Internationalisation Fellowships


The project will focus on micropalaeontology, the study of microscopic fossils. The microfossils chosen for this project are the Foraminifera: small, single-celled, shell-bearing organisms living in aquatic environments around the world. Foraminifera evolved approximately 544 million years ago and have been used extensively by micropalaeontologists to study ancient climates and ecological responses to changes therein. The specific aim of this project will be to study the bottom dwelling (benthic) foraminifera extracted from samples collected during the expedition. Sampling focus will be on the time leading up to, and across the globally recognised Ocean Anoxia Event 2 (OAE2).


The high latitudes (60°-62°S) of the Earth are of critical importance for the regulation of global climate, oceanographic currents and biogeochemical cycles both today and in the past. Yet, the history of these regions is poorly known particularly from past high-CO2 time intervals such as during the Cretaceous period (145 to 65 million years ago), including the globally recognised Ocean Anoxia Event 2 (OAE2: ~94 million years ago). This represents a fundamental gap in our understanding of how high-CO2 worlds operate, and ultimately hinders our ability to predict the effects of current and future anthropogenic climate change.


I will apply traditional palaeontological methods such as taxonomy (the study of species) and assemblage characterisation to study the changes across the OAE2 interval. Known benthic responses to ocean anoxia include decreases in both diversity and abundance or even complete absence. Other responses to expect could include a higher relative abundance of juvenile forms and/or a prevalence of thinner shell walls. As benthic foraminifera live directly on or within the ocean floor, they are as such, excellent indicators of ecological conditions, such as the general stability of the environment, water temperature, salinity, concentration of dissolved oxygen, availability of calcium carbonate and other nutrients, substrate type,and wave and current activity.

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