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    An ectobiont-bearing foraminiferan, Bolivina pacifica, that inhabits microxic pore waters : cell-biological and paleoceanographic insights

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    Bernhard Goldstein Bowser REVISION with figs.pdf (2.715Mb)
    Date
    2009-08-17
    Author
    Bernhard, Joan M.  Concept link
    Goldstein, Susan T.  Concept link
    Bowser, Samuel S.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3913
    As published
    https://doi.org/10.1111/j.1462-2920.2009.02073.x
    Abstract
    The presence of tests (shells) in foraminifera could be taken as an indicator that this protist taxon is unlikely to possess ectosymbionts. Here, however, we describe an association between Bolivina pacifica, a foraminiferan with a calcareous test, and a rod-shaped microbe (bacterium or archaeon) that is directly associated with the pores of the foraminiferan’s test. In addition to these putative ectosymbionts, B. pacifica has previously undescribed cytoplasmic plasma membrane invaginations (PMIs). These adaptations (i.e., PMIs, ectobionts), along with the clustering of mitochondria under the pores and at the cell periphery, suggest active exchange between the host and ectobiont. The B. pacifica specimens examined were collected from sediments overlain by oxygen-depleted bottom waters (0.7 μM) of the Santa Barbara Basin (SBB; California, USA). An ultrastructural comparison between B. pacifica from the SBB and a congener (Bolivina cf. B. lanceolata) collected from well-oxygenated sediments (Florida Keys) suggests that PMIs, ectobionts, and peripherally distributed mitochondria are all factors that promote inhabitation of microxic environments by B. pacifica. The calcitic δ13C signatures of B. pacifica and a of co-occurring congener (B. argentea) that lacks ectobionts differ by >1.5‰, raising the possibility that the presence of ectobionts can affect incorporation of paleoceanographic proxies.
    Description
    Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of John Wiley & Sons for personal use, not for redistribution. The definitive version was published in Environmental Microbiology 12 (2010): 2107-2119, doi:10.1111/j.1462-2920.2009.02073.x.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Bernhard, Joan M., Goldstein, Susan T., Bowser, Samuel S., "An ectobiont-bearing foraminiferan, Bolivina pacifica, that inhabits microxic pore waters : cell-biological and paleoceanographic insights", 2009-08-17, https://doi.org/10.1111/j.1462-2920.2009.02073.x, https://hdl.handle.net/1912/3913
     
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