Biological Dredge
Station: Rock PileDate: 10/24/2020, 10:21:00 AM
Conditions: 61°F, sunny, no clouds, no wind
Latitude: 33° 40' 19" N to 33° 40' 24" N
Longitude: 118° 13' 13" W to 118° 13' 18" W
Sediment Desc: Gravel to boulder sized rocks (siltstones)
Flora & Fauna:
| Common Name | Scientific Name | Total Captured | Method of Take | Disposition |
| Algae - Coraline Red | Calliarthron cheilosporioides | 10+ | biodredge | released |
| Chiton | unknown | 2 | biodredge | released |
| Clams - acorn | unknown | 10+ | biodredge | released |
| coral - cup | unknown | 10+ | biodredge | released |
| crabs - Rock | unknown | 1 | biodredge | released |
| Hydroid Feathers | unknown | 10+ | biodredge | released |
| Kelp - Red | unknown | 10+ | biodredge | released |
| Kelp - Sea Palm | unknown | 10+ | biodredge | released |
| Mussel | unknown | 10+ | biodredge | released |
| Sea Star - Armored | Astropecten armatus | 5 | biodredge | released |
| Sea Stars - brittle star | unknown | 3 | biodredge | released |
| Sponge | unknown | 10+ | biodredge | released |
| Stalked Tunicate | unknown | 5 | biodredge | released |
| Urchin - white | unknown | 3 | biodredge | released |
| whelk - Kellet's | Kelletia kelletii | 4 | biodredge | released |
| Worms - Polychaete | unknown | 10+ | biodredge | released |
This video was taken on this trip and shows how the biodredge is use and some of the organisms recovered. You're not hearing things - literally! There is no audio for the video due to a technical snafu . . .
Kelp does not put down roots in the sediments on the seafloor. Instead, it anchors itself onto rocks. Many organisms make these rocks their own. The area on the San Pedro shelf called the "Rock Pile" is where the coastline used to be 10,000 years ago. As the planet warmed and the ice sheets melted, sealevels rose, covering this rocky coastline with seawater.
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Nothing goes to waste in the ocean. Everything is used or resused. The hard parts of organisms either dissolve back into the water (shells, etc.), become a part of the rock record (fossils), or are reused (shells for hermit crabs, safe places to lay eggs, etc.).
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Below are some pictures of the organisms we collected during this biodredge. All organisms were returned to the ocean.
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