상세정보
Export to Refworks부가기능
Multiple Effects of Ocean Change on Crustacean Zooplankton: A Coupled Field-Laboratory Approach
상세 프로파일
| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Multiple Effects of Ocean Change on Crustacean Zooplankton: A Coupled Field-Laboratory Approach. |
| 개인저자 | McLaskey, Anna Kathleen. |
| 단체저자명 | University of Washington. Oceanography. |
| 발행사항 | [S.l.]: University of Washington., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 201 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-04B. Dissertation Abstract International |
| ISBN | 9781088303375 |
| 학위논문주기 | Thesis (Ph.D.)--University of Washington, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-04, Section: B.
Advisor: Keister, Julie E. |
| 이용제한사항 | This item must not be sold to any third party vendors.This item must not be added to any third party search indexes. |
| 요약 | In this dissertation I combine laboratory experiments and field observations across natural oceanographic gradients to investigate how crustacean zooplankton will be affected by ocean acidification (OA) and other co-occurring ocean changes. Anthropogenic emissions are increasing carbon dioxide concentrations in the atmosphere and ocean, causing declining seawater pH, increasing ocean temperatures, and decreasing dissolved oxygen concentrations. These changes have the potential to influence the metabolism, growth, and survival of crustacean zooplankton, such as copepods and krill, that act as critical prey items for higher trophic levels. Puget Sound, WA is a large coastal estuary with a wide range of pH and oxygen levels present in different areas and seasons. By coupling laboratory methods and field observations, a wide range of drivers and mechanisms of ocean change can be considered, forming a powerful research approach. In Chapters 2 and 3, I characterized the pH exposure of the copepod Calanus pacificus and the krill Euphausia pacifica in Puget Sound and reared their eggs and larvae under a range of pH conditions in the laboratory. I found that krill larvae are sensitive to reduced seawater pH and may already be affected by pH conditions in some areas of Puget Sound. In Chapter 4, I investigated the effects of elevated CO2 on the phytoplankton-copepod trophic link at two different temperatures, using the marine cryptophyte Rhodomonas salina and the calanoid copepod Acartia hudsonica. I observed complex shifts in phytoplankton fatty acid content and evidence of direct effects of CO2 on copepods, as well as indirect effects mediated through changes in the phytoplankton. In Chapter 5, I used enzyme activities as physiological indicators of how adult E. pacifica are affected by pH and oxygen in controlled laboratory conditions and across natural oceanographic gradients in Puget Sound. To characterize the high inter-individual variability displayed by this species, I used an individual-based approach that had not previously been used with these indicators. In Chapter 6, I examined the use of aminoacyl-tRNA synthetases (AARS) activity in individual krill, explored the biochemistry underlying the assay, and suggested a modification to the method. This dissertation increases our understanding of how key zooplankton taxa are affected by seawater pH and the multiple pathways by which they can be affected. Additionally, this dissertation provides a basis for understanding how E. pacifica may be affected by OA in the future. |
| 일반주제명 | Biological oceanography. Field study. |
| 언어 | 영어 |
| 바로가기 | 
: 이 자료의 원문은 한국교육학술정보원에서 제공합니다. |
