H1 East Transect – 2015

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Detailed Description

Permanent Site: H1 East Transect; Depth: 5.5 Meters (Feet 18.2); Distance from river mouth: 2.4 Kilometers (1.5 Miles) east; Pre/Post Dam Removal: 4 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. Seaweed growth of both reds (0:30, 1:53 seconds) and browns was profuse. Density of seaweeds appears to be at pre-dam removal levels. Nine different species of brown seaweeds are present, including Alaria marginata (0:13, 0:23 seconds), three-ribbed kelp Cymathere triplicata (0:08, 0:20 seconds), acid kelp Desmarestia (0:30, 2:26seconds), Saccharina spp. (1:43 seconds) and the perennial seaweed Pterygophora californica (2:54 seconds). Horse clams (Tresus capax) were still abundant. No invertebrates are seen on video due to the dense seaweed cover.


Date Taken:

Length: 00:03:16

Lat / Long: 48.147917700000 / -123.534728650000

Location Taken: US

Video Credits

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