F2 East Transect – 2013

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Detailed Description

Permanent Site: F2 East Transect; Depth: 11.7 Meters (38.3 Feet); Distance from river mouth: 1.5 Kilometers (0.9 Miles) east; Pre/Post Dam Removal: 2 years post-dam removal; Lat/Long: 48.15672004,-123.54969397; Site Description: This video was taken in September, about 40 days after the video on the west transect (F2 West Transect – 2013). Substrate is mainly gravel mixed with a little cobble and an occasional boulder. Seaweed has started to return, something that was not seen on F2 -West Transect at the end of July. Small juveniles of some brown (ie. Alaria marginata at 1:12 seconds) and red seaweeds are present. This late summer growth in new seaweed was a trend also seen in 2014 at sites to the east of the river mouth (H1 – West 2014). Invertebrates are common, especially truncate softshell clams (Mya truncata) and various species of decorator crabs. Many of the rocks that used to be covered by seaweeds still have fan hydroids growing on them (0:58 seconds). The yellow blotches seen on rocks are encrusting bryozoans (0:52 seconds). Other invertebrates seen on video: sunflower sea star Pycnopodia helianthoides (0:09 seconds), blood sea star Henricia leviuscula leviuscula (2:27 seconds).


Date Taken:

Length: 00:02:38

Lat / Long: 48.156720040000 / -123.549693970000

Location Taken: US

Video Credits

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