Thesis
Diverse taxa of zooplankton inhabit hypoxic waters during both day and night in a temperate eutrophic lake
Washington State University
Master of Science (MS), Washington State University
2018
Handle:
https://hdl.handle.net/2376/100830
Abstract
As the frequency and intensity of hypoxic events increase in both fresh and marine waters, understanding the ecological effects of such events becomes more important. The extant literature reports varying effects of hypolimnetic hypoxia on the vertical distribution and diel vertical migration (DVM) of zooplankton, with some but not all taxa reported to avoid hypoxic waters. We studied the vertical distribution and DVM of diverse zooplankton taxa throughout three seasons over two years (2014 and 2015) in Lacamas Lake, Washington, USA. We observed hypoxia (< 2 mg L-1 DO) in the hypolimnion of Lacamas Lake during five of six sampling periods, during which zooplankton often inhabited hypoxic waters (h-metric - defined as the proportion of a zooplankton population residing within hypoxic waters - ranged from h=0.14-1.00, with overall mean of h=0.66). Moreover, we observed a lack of DVM in most taxa on most occasions. We attribute these variations in residency within hypoxic waters to taxonspecific physiological tolerances, though the exact mechanisms at play remain to be fully elucidated. Nevertheless, the common residency in hypoxic waters and the lack of DVM by diverse zooplankton taxa that we observed may have implications for food web dynamics in Lacamas Lake and other water bodies.
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Details
- Title
- Diverse taxa of zooplankton inhabit hypoxic waters during both day and night in a temperate eutrophic lake
- Creators
- Sean Timothy Nolan
- Contributors
- Gretchen Rollwagen-Bollesn (Degree Supervisor)Stephen M. Bollens (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Environment, School of the (CAHNRS)
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525055001842
- Language
- English
- Resource Type
- Thesis