H1 West Transect – 2016

Download Video
Right-click and save to download

Detailed Description

Permanent Site: H1 West Transect; Depth: 5.7 Meters (18.7 Feet); Distance from river mouth: 2.4 Kilometers (1.5 Miles) east; Pre/Post Dam Removal: 5 years post-dam removal; Lat/Long: 48.14803012,-123.53535558; 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 (0:58 seconds) and browns is profuse and appears to be at pre-dam removal levels. Seven different species of brown seaweeds are present with the three most abundant being Alaria marginata (0:32, 0:52 seconds), three-ribbed kelp Cymathere triplicata (0:27, 1:52 seconds) and the perennial seaweed Pterygophora californica (0:08, 1:00 seconds). Woody debris was also present (1:46 seconds). Horse clams (Tresus capax) were still abundant. No invertebrates are seen on video due to the dense seaweed cover.


Date Taken:

Length: 00:02:03

Lat / Long: 48.148030120000 / -123.535355580000

Location Taken: US

Video Credits

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