H1 East Transect – 2013
Permanent Site: H1 East Transect; Depth: 5.4 Meters (Feet 17.8); Distance from river mouth: 2.4 Kilometers (1.5 Miles) east; Pre/Post Dam Removal: 2 years post-dam removal; Lat/Long: 48.1479177,-123.53472865; Site Description: This is a shallow site and one of the farthest removed from the effects of the sediment plume outside of the control sites. Substrate is still mainly gravel with some sand and cobble. This video includes footage from surveys conducted both on August 16 and August 30. During the first survey, the majority of the seaweeds seen were reds (0:11, 0:29 seconds) with a few brown seaweeds, mainly the perennial seaweed Pterygophora californica (0:20, 0:45 seconds) and Saccharina spp. (0:52 seconds). However, on August 30 (0:57 seconds) many other small brown seaweeds were now growing (1:02 seconds). The three-ribbed kelp Cymathere triplicata, that was absent during the first survey, numbered 75 plants and the seaweed Alaria marginata (1:09 seconds) increased from 2 to 53 plants. Bull kelp Nereocystis luetkeana (1:15 seconds) was present. Horse clams (Tresus capax) were still abundant as well as very small (~2-3 cm), juvenile Dungeness crabs (Metacarcinus magister). Invertebrates seen on video: red rock crab Cancer productus (0:21 seconds). USGS diver Steve Rubin is seen surveying at 1:49 seconds.