Hannah Marie Carroll

Hannah Marie Carroll
University of California, Los Angeles | UCLA · Department of Earth Planetary and Space Sciences (EPSS)

Doctor of Philosophy

About

21
Publications
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Introduction
I received my B.Sc. in Environmental Science from University of Washington Tacoma in 2008 under the guidance of Dr. Bonnie Becker. I received my Ph.D. with a double major in Ecology and Evolutionary Biology/Environmental Science in May 2020. I was co-advised by Dr. Lynn Clark and Dr. Alan Wanamaker. I am a late Quaternary paleoecologist. My work uses multiproxy methods to explore questions of community ecology and climate over the last ~20,000 years.

Publications

Publications (21)
Article
Full-text available
Elemental ratios in biogenic marine calcium carbonates are widely used in geobiology, environmental science, and paleoenvironmental reconstructions. It is generally accepted that the elemental abundance of biogenic marine carbonates reflects a combination of the abundance of that ion in seawater, the physical properties of seawater, the mineralogy...
Article
Full-text available
Trophic dynamics and conceptual niche spaces of top piscivores were assessed using stable isotope analysis following the introduction of hybrid striped bass Morone saxatilis (Walbaum) × Morone chrysops (Rafinesque) into an established reservoir fishery devoid of gizzard shad, Dorosoma cepedianum (Lasueur). Hybrid striped bass were initially stocked...
Article
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Patterns of vegetation distribution at regional to subcontinental scales can inform understanding of climate. Delineating ecoregion boundaries over geologic time is complicated by the difficulty of distinguishing between prairie types at broad spatial scales using the pollen record. Pollen ratios are sometimes employed to distinguish between vegeta...
Article
Stable isotopes in natural materials provide a powerful way to study energy flow in many systems and are widely used in fields such as archaeology, ecology, forensics, geochemistry, geology, oceanography, palaeoecology and palaeoclimatology. Based on the manner in which stable isotopes fractionate in natural systems, they allow scientists to addres...
Preprint
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Carbonate clumped isotope geochemistry has primarily focused on mass spectrometric determination of m/z 47 CO2 for geothermometry, but theoretical calculations and recent experiments indicate paired analysis of the m/z 47 (13C18O16O) and m/z 48 (12C18O18O) isotopologues (referred to as Δ47 and Δ48) can be used to study non-equilibrium isotope fract...
Article
Evolutionary biologists have long sought to disentangle phylogenetic relationships among taxa spanning the tree of life, an increasingly important task as anthropogenic influences accelerate population declines and species extinctions, particularly in insects. Phylogenetic analyses are commonly used to identify unique evolutionary lineages, to clar...
Preprint
Full-text available
Key Points: • We implement Bayesian methods for calibrating the carbonate 'clumped' isotope thermometer and reconstructing temperatures • Ordinary least squares linear and Bayesian regressions recover true regression parameters with the highest accuracy and precision • Bayesian temperature reconstructions are generally more precise and accurate th...
Article
Full-text available
Rationale: Clumped isotope geochemistry examines the pairing or clumping of heavy isotopes in molecules and provides information about the thermodynamic and kinetic controls on their formation. The first clumped isotope measurements of carbonate minerals were first published 15 years ago, and since then, interlaboratory offsets have been observed,...

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