H1 East Transect – April 2017

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Detailed Description

Permanent Site: H1 East Transect; Depth: 5.5 Meters (18.0 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 coverage of the sea floor has increased from 10% in March to 60% in just 28 days. Large reds (0:11, 1:06 seconds) as well as six species of brown seaweeds were present. Three species were very abundant; Alaria marginata (0:23, 0:27 seconds), three-ribbed kelp Cymathere triplicata (1:15 seconds) and the perennial seaweed Pterygophora californica, whose fronds had grown very long (0:16-0:21 seconds). 


Date Taken:

Length: 00:02:03

Location Taken: Elwha River, WA, US

Video Credits

Editor: Nancy Elder, Fishery Biologist, Marrowstone Marine Field Station, (nelder@usgs.gov)