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H1 East Transect – June 2017

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Detailed Description

Permanent Site: H1 East Transect; Depth: 5.4 Meters (17.6 Feet); Distance from river mouth: 2.4 Kilometers (1.5 Miles) east; Pre/Post Dam Removal: 6 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 remains mainly gravel with some sand, cobble and an occasional boulder. In 2017 surveys were conducted monthly for 6 months (Feb-July) to observe seaweed growth throughout the main growing season. During this month the seaweed growth is profuse, covering 100% of the sea floor. Large reds (0:56, 2:33 seconds) as well as six species of brown seaweeds were present. Two species were very abundant; Alaria marginata (1:02, 1:43 seconds) and three-ribbed kelp Cymathere triplicata (0:26, 0:37 seconds) The perennial seaweed Pterygophora californica (1:15 seconds) was also present with long, healthy fronds.




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