F1 East Transect – 2017

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Detailed Description

Permanent Site: F1 East Transect; Depth: 6.6 Meters (21.5 Feet); Distance from river mouth: 1.3 Kilometers (0.8 Miles) east; Pre/Post Dam Removal: 6 years post-dam removal; Lat/Long: 48.15292999, -123.55011402; Site Description: This is a shallow site. Substrate remains predominantly sand, but patches of gravel were present (0:39 seconds) as well as cobble onto which large seaweed was attached 0:24 seconds). Eight species of brown seaweed were found. The perennial seaweed Pterygophora californica (0:09, 1:11 seconds) was common. Four other species (three-ribbed kelp Cymathere triplicata (1:22 seconds), Alaria marginata (1:18, 1:34 seconds), acid kelp Desmarestia (1:31 seconds) and Saccharina, though not abundant, were large in size. These larger seaweeds are usually attached to gravel-cobble substrates, indicating that the sandy substrate might be just a thin layer on the surface. A large school of Pacific sand lance (Ammodytes hexapterus) (1:40 seconds) was present as were their frequent predators, starry flounders (Platichthys stellatus) (1:57 seconds). No invertebrates were seen.


Date Taken:

Length: 00:02:11

Location Taken: Elwha River, WA, US

Video Credits

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