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Shaw, Jack O; D'haenens, Simon; Thomas, Ellen; Norris, Richard D; Lyman, Johnnie A; Bornemann, André; Hull, Pincelli M (2018): Photosymbiosis in planktonic foraminifera across the Palaeocene-Eocene Thermal Maximum. PANGAEA, (DOI registration in progress), Supplement to: Shaw, JO et al. (submitted): Photosymbiosis in planktonic foraminifera across the Palaeocene-Eocene Thermal Maximum. Proceedings of the Royal Society of London

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Under stress, corals and foraminifera are known to 'bleach' by ejecting algal symbionts, a response that can lead to increased mortality. Similar responses are thought to have occurred in the past, but how they relate to the viability of species through global warming events and how common they might have been is unknown. Here we provide a detailed examination of photosymbiosis and population dynamics of planktonic foraminifera across the Palaeocene-Eocene Thermal Maximum (PETM, ~56 Ma), the most severe hyperthermal event of the Cenozoic. We find a variable response of photosymbiotic associations across localities, including: a collapse in the carbon isotopic signal of photosymbiosis at two sites (NE Atlantic DSDP Site 401 and Central Pacific ODP Site 1209), no significant change on the New Jersey shelf (Millville), and a lack of significant symbiotic signal prior to and during the event in the Southern Ocean (Site 690). Variable symbiont and depth habitat responses across sites emphasize the need for site-specific baselines for paleoceanographic reconstructions. Remarkably, in contrast to modern bleaching-induced mass mortality, populations of photosymbiont-bearing planktonic foraminifera did relatively well during the PETM, perhaps due to flexibility in symbiont associations (rather than bleaching) and the relatively protracted nature of the event.
Median Latitude: 27.443662 * Median Longitude: 59.368125 * South-bound Latitude: -65.160667 * West-bound Longitude: -8.810300 * North-bound Latitude: 47.427500 * East-bound Longitude: 158.506080
Date/Time Start: 1976-06-06T00:00:00 * Date/Time End: 2001-09-23T04:30:00
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