期刊
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 288, 期 1953, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rspb.2021.0863
关键词
K; Pg; biological pump; planktic foraminifera; ecosystem function; ecology
资金
- Natural Environment Research Council (NERC)
- Royal Society University Fellowships
- ERC grant PAst Links in the Evolution of Ocean's Global ENvIronment and Ecology (PALEOGENiE)
The study reveals that the impact at the Cretaceous/Palaeogene (K/Pg) boundary fundamentally disrupted the ocean's biological pump and plankton size and diversity. Surprisingly, the recovery of ecological traits occurred much later than the recovery of the biological pump.
The ocean biological pump is the mechanism by which carbon and nutrients are transported to depth. As such, the biological pump is critical in the partitioning of carbon dioxide between the ocean and atmosphere, and the rate at which that carbon can be sequestered through burial in marine sediments. How the structure and function of planktic ecosystems in the ocean govern the strength and efficiency of the biological pump and its resilience to disruption are poorly understood. The aftermath of the impact at the Cretaceous/Palaeogene (K/Pg) boundary provides an ideal opportunity to address these questions as both the biological pump and marine plankton size and diversity were fundamentally disrupted. The excellent fossil record of planktic foraminifera as indicators of pelagic-biotic recovery combined with carbon isotope records tracing biological pump behaviour, show that the recovery of ecological traits (diversity, size and photosymbiosis) occurred much later (approx. 4.3 Ma) than biological pump recovery (approx. 1.8 Ma). We interpret this decoupling of diversity and the biological pump as an indication that ecosystem function had sufficiently recovered to drive an effective biological pump, at least regionally in the South Atlantic.
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