These authors contributed equally to this work.
Response of deep-sea biodiversity to abrupt deglacial and Holocene climate changes in the North Atlantic Ocean
Article first published online: 20 APR 2014
© 2014 John Wiley & Sons Ltd
Global Ecology and Biogeography
Volume 23, Issue 9, pages 957–967, September 2014
How to Cite
Yasuhara, M., Okahashi, H., Cronin, T. M., Rasmussen, T. L. and Hunt, G. (2014), Response of deep-sea biodiversity to abrupt deglacial and Holocene climate changes in the North Atlantic Ocean. Global Ecology and Biogeography, 23: 957–967. doi: 10.1111/geb.12178
Editor: Michael A. Rex
- Issue published online: 13 AUG 2014
- Article first published online: 20 APR 2014
- Smithsonian Postdoctoral Fellowship
- Smithsonian Marine Science Network Postdoctoral Fellowship
- Japan Society for the Promotion of Science Postdoctoral Fellowships for Research Abroad
- Abrupt climate change;
- decadal–centennial time-scales;
- deep sea;
- deepwater circulation;
- species diversity;
Little is known about how marine biodiversity responds to oceanographic and climatic changes over the decadal to centennial time-scales which are most relevant for predicted climate changes due to greenhouse gas forcing. This paper aims to reveal decadal–centennial scale deep-sea biodiversity dynamics for the last 20,000 years and then explore potential environmental drivers.
The North Atlantic Ocean.
We investigated deep-sea benthic microfossil records to reveal biodiversity dynamics and subsequently applied comprehensive ecological modelling to test possible environmental factors (i.e. surface productivity, seasonality of productivity or deepwater circulation related to bottom-water temperature) that may have influenced deep-sea biodiversity over these time-scales.
Deep-sea biodiversity changed synchronously with stadial–interstadial climate changes over the last 20,000 years across a large area of the North Atlantic in both ostracod crustaceans and foraminiferan protozoa (in spite of their different dispersal abilities). Species diversity rapidly increased during abrupt stadial events during the last deglacial and the Holocene interglacial periods. These include the well-known Heinrich 1, the Younger Dryas and the 8.2 ka events when the strength of Atlantic Meridional Overturning Circulation (AMOC) decreased. There is also evidence for quasi-cyclic changes in biodiversity at a c. 1500-year periodicity, consistent with the well-known ‘1500-year climatic cycle’. Statistical analyses revealed that AMOC variability (probably specifically the variability in AMOC-driven bottom-water temperature) is correlated with deep-sea biodiversity.
Our finding of a significant AMOC–diversity relationship may indicate pervasive control of the diversity of deep-sea benthic species by rapidly changing climate, specifically bottom-water temperature, over decadal to centennial time-scales. Our results, based on highly resolved fossil records, may portend pervasive, synchronous and sudden ecosystem responses to human-induced changes to climate and ocean circulation in this century.