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Title: | Photosymbiosis in planktonic foraminifera across the Paleocene-Eocene thermal maximum | Authors: | Shaw, Jack O. D'HAENENS, Simon Thomas, Ellen Norris, Richard D. Lyman, Johnnie A. Bornemann, Andre Hull, Pincelli M. |
Issue Date: | 2021 | Publisher: | CAMBRIDGE UNIV PRESS | Source: | PALEOBIOLOGY, 47 (4) , p. 632 -647 | Abstract: | Under stress, corals and foraminifera may eject or consume their algal symbionts ("bleach"), which can increase mortality. How bleaching relates to species viability over warming events is of great interest given current global warming. We use size-specific isotope analyses and abundance counts to examine photosymbiosis and population dynamics of planktonic foraminifera across the Paleocene-Eocene thermal maximum (PETM, similar to 56 Ma), the most severe Cenozoic global warming event. We find variable responses of photosymbiotic associations across localities and species. In the NE Atlantic (DSDP Site 401) PETM, photosymbiotic clades (acarininids and morozovellids) exhibit collapsed size-delta C-13 gradients indicative of reduced photosymbiosis, as also observed in Central Pacific (ODP Site 1209) and Southern Ocean (ODP Site 690) acarininids. In contrast, we find no significant loss of size-delta C-13 gradients on the New Jersey shelf (Millville) or in Central Pacific morozovellids. Unlike modern bleaching-induced mass mortality, populations of photosymbiont-bearing planktonic foraminifera increased in relative abundance during the PETM. Multigenerational adaptive responses, including flexibility in photosymbiont associations and excursion taxon evolution, may have allowed some photosym-biotic foraminifera to thrive. We conclude that deconvolving the effects of biology on isotope composition on a site-by-site basis is vital for environmental reconstructions. | Notes: | Shaw, JO (corresponding author), Yale Univ, Dept Earth & Planetary Sci, 21 Sachem St, New Haven, CT 06511 USA. jack.shaw@yale.edu; pincelli.hull@yale.edu; ellen.thomas@yale.edu; rnorris@ucsd.edu; johnnielyman@gmail.com; andre.boniemann@bgr.de; pincelli.hull@yale.edv |
Document URI: | http://hdl.handle.net/1942/36282 | ISSN: | 0094-8373 | e-ISSN: | 1938-5331 | DOI: | 10.1017/pab.2021.7 | ISI #: | WOS:000723750300007 | Rights: | The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society. 0094-8373/21 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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S0094837321000075jra 632..647.pdf Restricted Access | Published version | 838.39 kB | Adobe PDF | View/Open Request a copy |
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