A few months ago, Manu introduced me to the foldscope in Stinson Beach, CA! Here are some movies of the organisms we collected.
- Sand crabs respond to waves by coming out of the sand to feed on plankton. After the wave has passed, they burrow back into the sand. Here, Manu is disturbing the water to simulate a wave, so we can collect some crabs in a frisbee for our foldscope.
2. We also found some shrimp, and looked at the embryos. The embryos had an interesting slit on one side.
3. This movie shows some different cell types in an adult shrimp. We found epithelial cell layers, circulating hemolymph, and a beating heart!
4. As Manu explains here, even in a very small volume of water, we found microplastic pollution.
5. Finally, we found some female sand crabs that were protecting clutches of eggs. The eggs were beautiful when viewed with the foldscope! We could see cellularized developing embryos, and we also saw that there was some kind of mesh holding the clutch of eggs together. We aren’t sure what the fibers are made of, but it was a cool (and unexpected) observation!