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L1 West Transect – 2013

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Detailed Description

Permanent Site: L1 West Transect; Depth: 11.2 Meters (36.9 Feet); Distance from river mouth: 2.3 Kilometers (1.4 Miles) west; Pre/Post Dam Removal: 2 years post-dam removal; Lat/Long: 48.13957527,-123.59427175; Site Description: This transect is medium depth. The first 20 meters contains scattered boulders (0:08 seconds). Where there are no boulders, substrate is now mainly fine sediment/sand/mud covered in a layer of brown diatoms (1:50 seconds). Seaweed is gone except for the Agarum fimbriatum growing on boulders (0:09, 0:21 seconds) which are also covered in articulated coralline algae (0:24 seconds). Several species of feather duster tubeworms (1:07, 1:32 seconds) are abundant as are truncate softshell clams Mya truncata (small siphons at 0:29 seconds). Invertebrates seen on video: hairy triton snail Fusitriton oregonensis (0:27, 1:05 seconds); vermillion sea star Mediaster aequalis (0:28seconds); staghorn bryozoan Heteropora pacifica (yellow clumps on boulder at 0:38 seconds); sunflower sea star Pycnopodia helianthoides (0:48 seconds); giant sea cucumber Parastichopus californicus (0:51 seconds); geoduck Panopea generosa (large siphon on right at 1:08 seconds); sand-rose anemone Urticina columbiana (1:13 seconds); rock scallop Crassadoma gigantean (orange crescent shape on left at 1:16 seconds).




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