Biological Dredge
Station: Rock PileDate: 3/17/2018, 1:56 PM
Conditions: 73° F, cloudless, windless
Latitude: 33° 40' 19.5" to 33° 40' 30" N
Longitude: 118° 14' 2.8" to 118° 13' 23" 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 | 2 | biodredge | released |
| Amphioxus (CA lancelet) | Branchiostoma californiense | 1 | biodredge | released |
| Anemone - Sand-rose | Urticina columbiana | 1 | biodredge | released |
| Clams - | unknown | 2 | biodredge | released |
| crabs - Rock | unknown | 1 | biodredge | released |
| Hydroid Feathers | unknown | 5 | biodredge | released |
| Kelp - Red | unknown | 10 | biodredge | released |
| Kelp - Sea Palm | unknown | 15 | biodredge | released |
| Mussel | unknown | 10 | biodredge | released |
| Sea Cucumber | unknown | 1 | biodredge | released |
| Sea Star - Armored | unknown | 3 | biodredge | released |
| Sea Stars - brittle star | unknown | 3 | biodredge | released |
| Snails - CA Frog Snail | Bursa californica | 1 | biodredge | released |
| Snails - Cone | unknown | 1 | biodredge | released |
| Snails - Moonsnail | unknown | 1 | biodredge | released |
| Stalked Tunicate | Boltenia ovifera | 3 | biodredge | released |
| Urchin - heart | unknown | 1 | biodredge | released |
| Urchin - white | unknown | 10 | biodredge | released |
| whelk - Kellet's | Kelletia kelletii | 4 | biodredge | released |
| Worms - Castle | unknown | 1 | biodredge | released |
| Worms - Polychaete | unknown | 1 | biodredge | released |
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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