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H1 West Transect – 2012

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Detailed Description

Permanent Site: H1 West Transect; Depth: 5.0 Meters (Feet 16.4); Distance from river mouth: 2.4 Kilometers (1.5 Miles) east; Pre/Post Dam Removal: 10 months 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. Density of seaweed has greatly decreased. Alaria marginata (1:03, 1:34 seconds) and the perennial seaweed Pterygophora californica (0:13, 0:17 seconds) are still present but the three-ribbed kelp Cymathere triplicata was almost all gone. Invertebrates were scarce except for horse clams (Tresus capax). Invertebrates seen on video: blood sea star Henricia leviuscula leviuscula (0:34 seconds); glassy plume hydroid Plumularia setacea (orange growth to right of tape at 1:41 seconds).




Public Domain.