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SDSU Highlights

SDSU College of Sciences Feature

Ka Mwee Paw and Angel Sanchez finished their internship with Lauren Strope and Gabby Kalbach this summer. Big thanks to Ka Mwee and Angel for their help attaching oyster sensors, participating in field work, feeding oysters, and hanging out with us at CMIL. We can’t wait to hear where their future adventures take them.

Read more about their internship experiences here: https://cmi.sdsu.edu/summer-semester-2022/

I had to give a remote talk for a symposium on Open Hardware at the annual Society for Integrative and Comparative Biology (SICB) meeting in January 2022, so here’s a copy for general consumption. In this talk, I discuss the approach and some of the tools (hardware and software) we use to develop specialized data logger devices for tracking how mussels and oysters are performing in estuaries and the wave-swept intertidal zone.

We have a new open access paper published in Scientific Reports that discusses differences in estimates of community-level productivity (photosynthesis vs. respiration) in tide pools. We carried out this work in southeastern Alaska on an intertidal rocky shore, where individual tide pools that become isolated from the ocean at low tide can serve as little contained communities. We estimated net production by measuring dissolved oxygen change within the pools under normal daylight conditions, during night time conditions, and under artificial dark conditions during the day. To create artificial dark conditions, we covered the tidepool with an opaque black tarp for at least 30 minutes, and then made oxygen measurements after that dark incubation.

We found that our estimates of net productivity in the community are very much affected by the dark incubation method used (plastic tarp during the day versus middle of the night), and that this affect appears to be tied to initial oxygen levels and water temperature, both of which change quite a bit during the course of the day. As a result, methods used to estimate community productivity should be approached with caution to make sure that you’re getting a reasonable measurement.

The paper can be accessed for free here: https://doi.org/10.1038/s41598-021-04685-8

Bracken, M.E.S., L.P. Miller, S.E. Mastroni, S.M. Lira and C.J.B. Sorte (2022)  Accounting for variation in temperature and oxygen availability when quantifying marine ecosystem metabolism. Scientific Reports 12, 825

Typically, measuring ocean wave conditions can require some fairly expensive equipment, or relies on distant wave buoys or computer models that may not give the best picture of your local field site. We designed the Open Wave Height Logger to provide researchers with a low-cost and long-duration pressure sensor data logger that could be used to reconstruct wave heights and sea state. The results of this project are available in our open access paper published in Limnology and Oceanography: Methods.

The electronic circuit board designs are made freely available, as well as the software to run the device, which is derived from the Arduino open source hardware project. The sensor and batteries get housed in a homemade PVC plumbing pipe housing. More information can be found on the project’s Github repository and at http://owhl.org which contains a wealth of information on all of the assembly, programming, and deployment methods we’ve come up with during the course of this project.

The Journal of Experimental Biology highlighted our paper on the interaction between limpet temperature stress and susceptibility to oystercatcher predation. The news article is available here: https://jeb.biologists.org/content/223/7/jeb224923

The paper that this work is based on is available here: https://jeb.biologists.org/content/223/7/jeb213595. This work was done in collaboration with Rachel Pound and Professor Jennifer Burnaford at CSU Fullerton as part of Rachel’s M.Sc. project. Felicia King helped with the design of the limpet force transducer that we used to estimate the force exerted by the pecking oystercatcher.