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Evaluation and Application of Amino Acid Carbon and Nitrogen Isotope Proxies for Reconstructing Past Plankton Ecosystem Change
Evaluation and Application of Amino Acid Carbon and Nitrogen Isotope Proxies for Reconstructing Past Plankton Ecosystem Change
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103824
- ISBN
- 9798288887918
- DDC
- 560
- 서명/저자
- Evaluation and Application of Amino Acid Carbon and Nitrogen Isotope Proxies for Reconstructing Past Plankton Ecosystem Change
- 발행사항
- [Sl] : University of California, Santa Cruz, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 243 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Includes supplementary digital materials.
- 주기사항
- Advisor: McCarthy, Matthew.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Santa Cruz, 2025.
- 초록/해제
- 요약Application of compound-specific amino acid carbon and nitrogen isotope proxies to paleoceanographic archives can offer detailed insight into nutrient cycling and plankton ecosystem variability prior to modern observations. Amino acid proxies offer a number of benefits as a complementary alternative to traditional biomarker, microfossil or bulk carbon and nitrogen isotope proxies, including rich information potential and applicability not only to sediments where organic molecules and microfossils are directly preserved, but also to high-resolution living archives like deep-sea coral and bivalves that record the isotopic signatures of dietary organic matter. Prior work demonstrated the great potential of amino acid isotope proxies for reconstructing past climate-driven changes, offering unparalleled insight into plankton ecosystem trophic structure, as well as the carbon and nitrogen isotopic values and community composition of phytoplankton that form the base of marine food webs. However, amino acid isotopes currently represent a rapidly-evolving frontier in paleoceanography, and many open questions remain about how to best interpret and understand these records. In this dissertation, I present work from three distinct chapters focused on application and evaluation of amino acid carbon and nitrogen isotope proxies for paleoceanographic and paleoecological applications.In Chapter 1, I applied amino acid carbon and nitrogen isotopes to the skeletons of long-lived deep-sea bamboo coral from the central California margin to assess bamboo coral trophic ecology and reconstruct past climate-driven biogeochemical change on the California margin since the pre-Industrial period. Comparison of the amino acid isotope signatures of skeletal protein to local sediment traps and major marine organic matter endmembers indicate feeding directly on exported sinking particles, validating bamboo coral as archives of surface plankton ecosystem processes. The 200-year reconstruction reveals unexpected relationships between the Pacific Decadal Oscillation, a major multidecadal mode of climate variability, and plankton ecosystem dynamics at our study site on the central California margin. Finally, as the first deep-sea coral amino acid δ15N reconstruction from an upwelling margin, this work lays the foundation for future paleoceanographic work in highly productive coastal upwelling ecosystems.In Chapter 2, I investigated the drivers of a puzzling observation from my work in Chapter 1 and other previous amino acid isotope paleoceanographic reconstructions. In all these reconstructions, an unexpected strong negative relationship is observed between proxies for plankton trophic ecology and δ15N of primary production, suggesting the possibility of inherent coupling. The results from a newly developed mass-balance biogeochemical modeling approach show that the observed coupling is likely explained by phytoplankton recycled nutrient uptake. This finding has critical implications for accurate interpretation of amino acid δ15N proxies in paleoceanographic records, suggesting that food web and nitrogen recycling processes likely play an underappreciated role in driving δ15N values of marine primary production.In Chapter 3, I performed a validation study to assess the accuracy of the essential amino acid \uD835\uDEFF13C "fingerprinting" technique for reconstructing phytoplankton community composition and tracing primary producer sources of carbon through food webs. For this work, I applied essential amino acid carbon isotope "fingerprinting" techniques to suspended particulate organic matter collected over a one-year period in northern Monterey Bay. Although lab-cultured endmembers show distinct isotopic signatures, Bayesian endmember mixing analysis fails to accurately reconstruct the known community composition from independent microscopy-based estimates. This study has important implications for future applications of essential amino acid \uD835\uDEFF13C fingerprinting in both food web and paleo studies, demonstrating that endmember separation does not necessarily translate into accurate estimates of community composition.
- 일반주제명
- Paleoecology
- 일반주제명
- Chemical oceanography
- 일반주제명
- Paleoclimate science
- 키워드
- Deep-sea coral
- 키워드
- Isotope ecology
- 키워드
- Paleoceanography
- 키워드
- Trophic ecology
- 기타저자
- University of California, Santa Cruz Ocean Sciences
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■007cr#unu||||||||
■020 ▼a9798288887918
■035 ▼a(MiAaPQ)AAI32047490
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a560
■1001 ▼aPugsley, Genevieve.▼0(orcid)0000-0002-6673-6948
■24510▼aEvaluation and Application of Amino Acid Carbon and Nitrogen Isotope Proxies for Reconstructing Past Plankton Ecosystem Change
■260 ▼a[Sl]▼bUniversity of California, Santa Cruz▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a243 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aIncludes supplementary digital materials.
■500 ▼aAdvisor: McCarthy, Matthew.
■5021 ▼aThesis (Ph.D.)--University of California, Santa Cruz, 2025.
■520 ▼aApplication of compound-specific amino acid carbon and nitrogen isotope proxies to paleoceanographic archives can offer detailed insight into nutrient cycling and plankton ecosystem variability prior to modern observations. Amino acid proxies offer a number of benefits as a complementary alternative to traditional biomarker, microfossil or bulk carbon and nitrogen isotope proxies, including rich information potential and applicability not only to sediments where organic molecules and microfossils are directly preserved, but also to high-resolution living archives like deep-sea coral and bivalves that record the isotopic signatures of dietary organic matter. Prior work demonstrated the great potential of amino acid isotope proxies for reconstructing past climate-driven changes, offering unparalleled insight into plankton ecosystem trophic structure, as well as the carbon and nitrogen isotopic values and community composition of phytoplankton that form the base of marine food webs. However, amino acid isotopes currently represent a rapidly-evolving frontier in paleoceanography, and many open questions remain about how to best interpret and understand these records. In this dissertation, I present work from three distinct chapters focused on application and evaluation of amino acid carbon and nitrogen isotope proxies for paleoceanographic and paleoecological applications.In Chapter 1, I applied amino acid carbon and nitrogen isotopes to the skeletons of long-lived deep-sea bamboo coral from the central California margin to assess bamboo coral trophic ecology and reconstruct past climate-driven biogeochemical change on the California margin since the pre-Industrial period. Comparison of the amino acid isotope signatures of skeletal protein to local sediment traps and major marine organic matter endmembers indicate feeding directly on exported sinking particles, validating bamboo coral as archives of surface plankton ecosystem processes. The 200-year reconstruction reveals unexpected relationships between the Pacific Decadal Oscillation, a major multidecadal mode of climate variability, and plankton ecosystem dynamics at our study site on the central California margin. Finally, as the first deep-sea coral amino acid δ15N reconstruction from an upwelling margin, this work lays the foundation for future paleoceanographic work in highly productive coastal upwelling ecosystems.In Chapter 2, I investigated the drivers of a puzzling observation from my work in Chapter 1 and other previous amino acid isotope paleoceanographic reconstructions. In all these reconstructions, an unexpected strong negative relationship is observed between proxies for plankton trophic ecology and δ15N of primary production, suggesting the possibility of inherent coupling. The results from a newly developed mass-balance biogeochemical modeling approach show that the observed coupling is likely explained by phytoplankton recycled nutrient uptake. This finding has critical implications for accurate interpretation of amino acid δ15N proxies in paleoceanographic records, suggesting that food web and nitrogen recycling processes likely play an underappreciated role in driving δ15N values of marine primary production.In Chapter 3, I performed a validation study to assess the accuracy of the essential amino acid \uD835\uDEFF13C "fingerprinting" technique for reconstructing phytoplankton community composition and tracing primary producer sources of carbon through food webs. For this work, I applied essential amino acid carbon isotope "fingerprinting" techniques to suspended particulate organic matter collected over a one-year period in northern Monterey Bay. Although lab-cultured endmembers show distinct isotopic signatures, Bayesian endmember mixing analysis fails to accurately reconstruct the known community composition from independent microscopy-based estimates. This study has important implications for future applications of essential amino acid \uD835\uDEFF13C fingerprinting in both food web and paleo studies, demonstrating that endmember separation does not necessarily translate into accurate estimates of community composition.
■590 ▼aSchool code: 0036.
■650 4▼aPaleoecology
■650 4▼aChemical oceanography
■650 4▼aPaleoclimate science
■653 ▼aAmino acid isotopes
■653 ▼aDeep-sea coral
■653 ▼aIsotope ecology
■653 ▼aPacific Decadal Oscillation
■653 ▼aPaleoceanography
■653 ▼aTrophic ecology
■690 ▼a0426
■690 ▼a0403
■690 ▼a0653
■71020▼aUniversity of California, Santa Cruz▼bOcean Sciences.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0036
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358273▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
