L1 East Transect – 2012

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Detailed Description

Permanent Site: L1 East Transect; Depth: 11.0 Meters (36.2 Feet); Distance from river mouth: 2.3 Kilometers (1.4 Miles) west; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.13957527,-123.59359993; Site Description: This permanent site was only established post dam-removal after it was discovered that the degree of seaweed loss was more extensive than expected at the other permanent sites. Three sites, two further east (J1, K1) and one further west (L1) of the river mouth, were set up on former random sites known to have seaweed. Pre-dam removal conditions of the L1 area can be seen on the video ‘3MS18 (L1) West Transect – 2008’. This transect is medium depth with substrate that’s mainly fine sediment/sand/gravel with a patch of boulders in the center (0:55 seconds). Brown seaweed is still present, including acid kelp Desmarestia (0:06, 1:46 seconds), Saccharina spp. (0:26 seconds) and Costaria costata (0:35 seconds). Invertebrates seen on video: sand-rose anemone Urticina columbiana (0:09 seconds); rough piddock Zirfaea pilsbryi (siphon is two small circles to left of tape at 0:09 seconds); rainbow sea star Orthasterias koehleri (0:56 seconds); orange sea cucumber Cucumaria miniata (1:10 seconds); cushion/slime sea star Pteraster tesselatus (1:10 seconds); sunflower sea star Pycnopodia helianthoides (1:48, 2:10 seconds); giant sea cucumber Parastichopus californicus (2:01 seconds).
 

Details

Image Dimensions: 1280 x 720

Date Taken:

Length: 00:02:14

Lat / Long: 48.139575270000 / -123.593599930000

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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