Exploring photosymbiotic ecology of planktic foraminifers from chamber-by-chamber isotopic history of individual foraminifers

Haruka Takagi, Kazuyoshi Moriya, Toyoho Ishimura, Atsushi Suzuki, Hodaka Kawahata, Hiromichi Hirano

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    Evolution of photosymbiotic ecology is an important adaptation for planktic foraminifers that enhances the ecological advantage of living in oligotrophic oceans. Therefore, detecting photosymbiotic ecology in fossil species is one of the keys to understanding the paleobiodiversity dynamics of planktic foraminifers. Because foraminiferal tests record the ontogenetic history of ecological information in geochemical signatures, analyzing individual geochemical profiles with growth can reveal a species’ ecology. This study examined chamber-by-chamber stable isotopes (Î13C and Î18O) of foraminiferal individuals to identify photosymbiotic signals. We observed an ontogenetic Î13C increase of up to 2.4‰, accompanied by relatively stable, negative Î18O, in the symbiotic species Globigerinoides conglobatus and Globigerinoides sacculifer. In contrast, Î13C and Î18O showed significant positive correlation during ontogeny in the asymbiotic species Globorotalia truncatulinoides. These two ecological groups produce contrasting isotopic profiles, thereby allowing us to use our ontogenetic isotopic analyses of individual specimens to identify algal photosymbiosis in fossil foraminifers. The chamber-by-chamber isotope analyses with individual ontogeny have great advantages in analyzing rare species because only one individual is required to describe ontogenetic isotopic history. In addition to photosymbiotic identification, our methods hold great potential to provide new insight into species paleoecological studies such as the ontogenetic history of calcification depth.

    Original languageEnglish
    Pages (from-to)108-121
    Number of pages14
    JournalPaleobiology
    Volume41
    Issue number1
    DOIs
    Publication statusPublished - 2015 Mar 10

    Fingerprint

    Foraminifera
    Ecology
    foraminifera
    History
    ecology
    Isotopes
    history
    ontogeny
    fossils
    calcification
    Oceans and Seas
    stable isotopes
    fossil
    isotopes
    oceans
    identification method
    rare species
    Growth
    stable isotope
    Retaria

    ASJC Scopus subject areas

    • Agricultural and Biological Sciences(all)
    • Palaeontology
    • Ecology, Evolution, Behavior and Systematics
    • Ecology

    Cite this

    Exploring photosymbiotic ecology of planktic foraminifers from chamber-by-chamber isotopic history of individual foraminifers. / Takagi, Haruka; Moriya, Kazuyoshi; Ishimura, Toyoho; Suzuki, Atsushi; Kawahata, Hodaka; Hirano, Hiromichi.

    In: Paleobiology, Vol. 41, No. 1, 10.03.2015, p. 108-121.

    Research output: Contribution to journalArticle

    Takagi, Haruka ; Moriya, Kazuyoshi ; Ishimura, Toyoho ; Suzuki, Atsushi ; Kawahata, Hodaka ; Hirano, Hiromichi. / Exploring photosymbiotic ecology of planktic foraminifers from chamber-by-chamber isotopic history of individual foraminifers. In: Paleobiology. 2015 ; Vol. 41, No. 1. pp. 108-121.
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