Dan van Hees

Dan van Hees
Western Washington University | WWU · Department of Biology

PhD

About

6
Publications
1,589
Reads
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63
Citations
Additional affiliations
June 2017 - present
Western Washington University
Position
  • Consultant
September 2009 - December 2011
Western Washington University
Position
  • PhD Student
Education
January 2015 - November 2018
University of Western Australia
Field of study
  • Marine Chemical Ecology
September 2009 - December 2011
Western Washington University
Field of study
  • Marine Science
August 2004 - December 2007
University of Wyoming
Field of study
  • Biology

Publications

Publications (6)
Thesis
Full-text available
Connectivity of populations through the transfer of individuals is one of the key processes for maintaining ecosystem stability and resilience of coastal ecosystems. During reproduction, dislodged seaweeds of the genus Sargassum form large pelagic surface rafts that can persist for several weeks, and potentially act as a dispersal vector. In surfac...
Article
Full-text available
Connectivity of populations through the transfer of individuals is one of the key processes for maintaining ecosystem stability and resilience of coastal ecosystems. During reproduction, dislodged seaweeds of the genus Sargassum form large pelagic surface rafts that can persist for several weeks, and potentially act as a dispersal vector. In surfac...
Article
Full-text available
Phenolic compounds are found in all brown macroalgae and function as cell wall structure, UV protection and as herbivore deterrents. The concentrations of phenolic compounds vary among taxa and between temperate and tropical ecosystems. Australasia has high concentrations of soluble phenolics compared to other regions. Presently, relationships betw...
Article
Full-text available
Macroalgal blooms are occurring in greater size and frequency and many of these blooms are composed of ulvoid green algae. Ulvoid algae can release a variety of allelopathic compounds that include reactive oxygen species (ROS), oxidants that have detrimental effects on other organisms. When algae are subjected to environmental stressors, oxidant pr...
Article
In the NE Pacific, Ulvaria obscura is a common component of “green tide” blooms. It is also the only alga known to produce dopamine, which is released into seawater on sunny days when Ulvaria is emersed and then rehydrated. To better understand the mechanisms associated with dopamine release, we experimentally determined whether light quantity and...

Questions

Question (1)
Question
I'm troubleshooting Fv/Fm measurements on dark-adapted snow algae samples in the field. We have a field season coming up in the North Cascade Mountains here in Washington State. I have an Opti-Sciences OS1p flourometer. If you have insight into the process, I would love to hear about your successes and struggles.
The unknown factors I forsee coming up are:
- Does the probe need to be submerged in the sample?
- What is the ideal "slushiness" of the sample? i.e. how much water vs. snow?
- How long to dark-adapt samples?
- How much algal tissue is necessary for accurate readings?
Thanks for your thoughts.

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Projects

Projects (2)
Project
Determine the photosynthetic capacity and ontogenetic seasonality of snow algal blooms around Mount Baker in the North Cascade Mountains. Investigate the ability to culture snow algae in laboratory conditions using minimal equipment (ie. bins and aquarium lights). Monitor developmental stage and pigment evolution during laboratory growth.
Project
Quantify the changes in chemical composition and physiology of Sargassum plants as they form floating rafts. This includes quantification of photosynthetic parameters, phenolic compounds, and pigments.