Rohret Shari M.

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Rohret
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Shari M.
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  • Article
    An integrative re-evaluation of Typhlatya shrimp within the karst aquifer of the Yucatan Peninsula, Mexico
    (Nature Research, 2022-03-29) Ballou, Lauren ; Brankovits, David ; Chávez-Solís, Efraín M. ; Chávez Díaz, José M. ; Gonzalez, Brett C. ; Rohret, Shari ; Salinas, Alexa ; Liu, Arielle ; Simões, Nuno ; Alvarez, Fernando ; Miglietta, Maria Pia ; Iliffe, Thomas ; Borda, Elizabeth
    The Yucatán Peninsula, Mexico is a carbonate platform well-known for extensive karst networks of densely stratified aquifer ecosystems. This aquifer supports diverse anchialine fauna, including species of the globally distributed anchialine shrimp genus Typhlatya (Atyidae). Four species (T. campecheae, T. pearsei, T. dzilamensis and T. mitchelli) are endemic to the Peninsula, of which three are federally listed in Mexico. This first integrative evaluation (i.e., molecular, morphological, broad geographic and type locality sampling, and environmental data) of Yucatán Typhlatya reveals considerable species identity conflict in prior phylogenetic assessments, broad species ranges, syntopy within cave systems and five genetic lineages (of which two are new to science). Despite sampling from the type locality of endangered T. campecheae, specimens (and molecular data) were indistinguishable from vulnerable T. pearsei. Ancestral/divergence reconstructions support convergent evolution of a low-salinity ancestor for a post-Paleogene arc Yucatán + Cuba Typhlatya clade within the anchialine Atyidae clade. A secondary adaptation for the coastal-restricted euryhaline (2–37 psu), Typhlatya dzilamensis (unknown conservation status) was identified, while remaining species lineages were low-salinity (< 5 psu) adapted and found within the meteoric lens of inland and coastal caves. This study demonstrates the need for integrative/interdisciplinary approaches when conducting biodiversity assessments in complex and poorly studied aquifers.
  • Article
    Inhabitation of bathyal hydrocarbon seeps by early-branching benthic foraminifera: Implications for Neo-Proterozoic ecosystem functioning
    (Cushman Foundation for Foraminiferal Research, 2024-07-26) Rohret, Shari M. ; Bernhard, Joan M.
    Little is known about mechanisms allowing agglutinated and thecate (i.e., organic-walled) foraminifera associated with extreme environments to survive. Here, we present cytological observations of organic-walled and agglutinated monothalamid and milioline tubothalamids collected from sulfur-oxidizing microbial mats of Gulf of Mexico hydrocarbon seeps. This is the first ultrastructural analysis of allogromids, a basal group of organic-walled thecate foraminifera, from seeps. We show most allogromids contained numerous ingested bacteria of various forms; organelle abundance and distribution varied among their morphotypes. Saccaminids (agglutinated monothalamids) had abundant phagocytosed bacteria, including putative methanotrophic and sulfur-oxidizing bacteria, indicating foraminiferal activity in seeps. A porcelaneous tubothalamid morphotype contained phagocytosed bacteria of one morphology, suggesting food selectivity. Increasing our knowledge of the cytology and ecology of these modern representatives of early-evolving foraminifera could help elucidate their evolutionary history. Thus, we augment understanding of extremophile foraminifera, adding to our burgeoning understanding of microeukaryote protists and microfossil adaptations.