F1 West Transect – 2014

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Detailed Description

Permanent Site: F1 West Transect; Depth: 6.6 Meters (21.6 Feet); Distance from river mouth: 1.3 Kilometers (0.8 Miles) east; Pre/Post Dam Removal: 3 years post-dam removal; Lat/Long: 48.15292999, -123.55078602; Site Description: This video is a good example of a site that is actively being covered in sandy sediment from the dam removals. Only the western most 6 meters of the transect has the former gravel substrate mixed with sand, woody debris and dead bivalve shells (0:04-0:27 seconds). Substrate then converts to pure sand. Algae is gone except for some reds who are attached to boulders (2:52, 3:16 seconds) or cobble buried by only a shallow layer of sand (1:14 seconds). A good view of the edge of the encroaching sand can be seen on the left of the transect tape at 0:57 seconds where some algae remains as opposed to the pure sand on the right of the tape (1:02 seconds). A small speckled sanddab fish, a species common on sandy substrate, is seen at 2:35 seconds. Invertebrates are scarce. 
 

Details

Date Taken:

Length: 00:03:34

Lat / Long: 48.152929990000 / -123.550786020000

Location Taken: US

Video Credits

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

Transcript

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