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Physical-Biological Coupling of Krill Drives Blue Whale Foraging at Submesoscales
Physical-Biological Coupling of Krill Drives Blue Whale Foraging at Submesoscales
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104745
- ISBN
- 9798290652412
- DDC
- 612
- 서명/저자
- Physical-Biological Coupling of Krill Drives Blue Whale Foraging at Submesoscales
- 발행사항
- [Sl] : Stanford University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 153 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Advisor: Goldbogen, Jeremy.
- 학위논문주기
- Thesis (Ph.D.)--Stanford University, 2024.
- 초록/해제
- 요약To sustain their extreme body size, blue whales (Balaenoptera musculus) rely on consuming large quantities of small-bodied prey. Their primary prey (i.e., krill, Euphausia spp.), however, is unevenly distributed in the environment and is often aggregated into dynamic, ephemeral patches. Patchiness occurs across a range of hierarchical scales, but there is mounting evidence that submesoscale (i.e., 10 km) ocean processes play a critical yet understudied role in structuring marine ecosystems, especially in the context of predator-prey interactions and their cascading trophic consequences. This dissertation leverages novel technologies at the intersection of biologging, hydroacoustics and remote sensing to inform our understanding of krill patch formation and how blue whales find and feed on them.In Chapter 1, I measure blue whale movement and foraging performance concurrently with empirically-derived surface current features to evaluate how habitat selection influences feeding rates of a marine predator. The findings reveal a consistent functional relationship in which blue whales disproportionately foraged within dynamic aggregative submesoscale features at both the regional and feeding site scales across seasons, regions, and years. This study directly links submesoscale oceanic features to predator feeding rates and represents a significant advance in our understanding of how animals optimize foraging performance in dynamic oceanic environments. Further, the strong associations between foraging performance and aggregative features found here provide an important mechanistic explanation for increased energy gain among predators at mesoscale features demonstrated in previous research. Finally, these results link ephemeral ocean features to predator feeding performance, which could improve our understanding and dynamic management of critical habitat for this threatened species in near real-time.In Chapter 2, I build upon the results from Chapter 1 to examine whether the aggregative surface current features that are important to blue whales also show a similar relationship with krill and multiple predator aggregations. This study evaluates physical-biological coupling among oceanographic features, acoustically detected prey fields, and cetacean sightings in the Central California region. The results show that aggregative surface current features, represented by Lagrangian coherent structures (LCS) integrated over temporal scales between 2 and 10 days, were associated with increased subsurface seawater density, krill density, and baleen whale presence. The link between physical oceanography, krill density and predator distributions found here suggests that submesoscale processes, which lie between the fine and mesoscales explored in previous studies, serve as a critical scale for energy flux and nutrient transfer across trophic levels. This study represents a significant advance in our understanding of the mechanisms that drive patchiness in dynamic oceanic environments and is a first step to help inform effective management and conservation goals in this productive ecosystem.In Chapter 3 I ask, how do blue whales find submesoscale aggregative features that contain higher densities of krill? This study uses high-resolution tag data to investigate the periods immediately preceding the onset of feeding bouts to better understand the search behaviors blue whales use to find krill at the submesoscale. The results show that blue whales transition from tortuous movement to directed movement toward feeding locations at a range of approximately 1.62 km to the krill patch.
- 일반주제명
- Physiology
- 일반주제명
- Plankton
- 일반주제명
- Kinematics
- 일반주제명
- Software
- 일반주제명
- Investigations
- 일반주제명
- Writing
- 일반주제명
- Whales & whaling
- 일반주제명
- Funding
- 일반주제명
- Foraging behavior
- 일반주제명
- Ecosystems
- 일반주제명
- Visualization
- 일반주제명
- Birds
- 일반주제명
- Chlorophyll
- 일반주제명
- Ecosystem biology
- 기타저자
- Stanford University.
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798290652412
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■035 ▼a(MiAaPQ)Stanfordxf589kv7039
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a612
■1001 ▼aFahlbusch, James Andrew.
■24510▼aPhysical-Biological Coupling of Krill Drives Blue Whale Foraging at Submesoscales
■260 ▼a[Sl]▼bStanford University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a153 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aAdvisor: Goldbogen, Jeremy.
■5021 ▼aThesis (Ph.D.)--Stanford University, 2024.
■520 ▼aTo sustain their extreme body size, blue whales (Balaenoptera musculus) rely on consuming large quantities of small-bodied prey. Their primary prey (i.e., krill, Euphausia spp.), however, is unevenly distributed in the environment and is often aggregated into dynamic, ephemeral patches. Patchiness occurs across a range of hierarchical scales, but there is mounting evidence that submesoscale (i.e., 10 km) ocean processes play a critical yet understudied role in structuring marine ecosystems, especially in the context of predator-prey interactions and their cascading trophic consequences. This dissertation leverages novel technologies at the intersection of biologging, hydroacoustics and remote sensing to inform our understanding of krill patch formation and how blue whales find and feed on them.In Chapter 1, I measure blue whale movement and foraging performance concurrently with empirically-derived surface current features to evaluate how habitat selection influences feeding rates of a marine predator. The findings reveal a consistent functional relationship in which blue whales disproportionately foraged within dynamic aggregative submesoscale features at both the regional and feeding site scales across seasons, regions, and years. This study directly links submesoscale oceanic features to predator feeding rates and represents a significant advance in our understanding of how animals optimize foraging performance in dynamic oceanic environments. Further, the strong associations between foraging performance and aggregative features found here provide an important mechanistic explanation for increased energy gain among predators at mesoscale features demonstrated in previous research. Finally, these results link ephemeral ocean features to predator feeding performance, which could improve our understanding and dynamic management of critical habitat for this threatened species in near real-time.In Chapter 2, I build upon the results from Chapter 1 to examine whether the aggregative surface current features that are important to blue whales also show a similar relationship with krill and multiple predator aggregations. This study evaluates physical-biological coupling among oceanographic features, acoustically detected prey fields, and cetacean sightings in the Central California region. The results show that aggregative surface current features, represented by Lagrangian coherent structures (LCS) integrated over temporal scales between 2 and 10 days, were associated with increased subsurface seawater density, krill density, and baleen whale presence. The link between physical oceanography, krill density and predator distributions found here suggests that submesoscale processes, which lie between the fine and mesoscales explored in previous studies, serve as a critical scale for energy flux and nutrient transfer across trophic levels. This study represents a significant advance in our understanding of the mechanisms that drive patchiness in dynamic oceanic environments and is a first step to help inform effective management and conservation goals in this productive ecosystem.In Chapter 3 I ask, how do blue whales find submesoscale aggregative features that contain higher densities of krill? This study uses high-resolution tag data to investigate the periods immediately preceding the onset of feeding bouts to better understand the search behaviors blue whales use to find krill at the submesoscale. The results show that blue whales transition from tortuous movement to directed movement toward feeding locations at a range of approximately 1.62 km to the krill patch.
■590 ▼aSchool code: 0212.
■650 4▼aPhysiology
■650 4▼aPlankton
■650 4▼aKinematics
■650 4▼aSoftware
■650 4▼aInvestigations
■650 4▼aWriting
■650 4▼aWhales & whaling
■650 4▼aFunding
■650 4▼aForaging behavior
■650 4▼aEcosystems
■650 4▼aVisualization
■650 4▼aEndangered & extinct species
■650 4▼aBirds
■650 4▼aChlorophyll
■650 4▼aEcosystem biology
■690 ▼a0719
■71020▼aStanford University.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0212
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358741▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


