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Pahavit's Universe

pahavit
Date: 3-21-2013 12:27 AM
Subject: National Wildlife Refuge - Ravenswood Trail
Security: Public
Tags:balloon, bird, bottle, cone, crash barrier, dumbarton bridge, eastern mud snail, feather, field trip, ilyanassa, insect, marsh, power lines, raven, rust, shotgun shell, sign, snail, trash, wildlife refuge
National Wildlife Refuge - Ravenswood Trail


On Saturday D. and I went to the flat trails at the Don Edwards San Francisco Bay National Wildlife Refuge, and I took some pics.


A raven perches on a communication antenna with a huge wad of something in its beak.





Power lines.







It's low tide.





As we set out along a levee we find a lot of trash.















A look at a former salt evaporation pond.





Non-native Eastern mud snails (Ilyanassa obsoleta) crawl around in the mud.





Willets probe in the mud for things to eat.





The mild afternoon sun on the cool exposed mud causes steam to rise.





The Dumbarton Bridge.





There is a lot of rubble alongside the bay edge of the levee.





A flock of egrets circles over the bay.





More rubble, some of it very rusty.











A tiny wasp visits an oxalis blossom





Gumplant is a common sight in the salt marshes.





In an up-ended concrete cylinder at the edge of the bay I find a little sea garden, a tiny ecosystem created by high tides washing over its rim twice a day.  There is seaweed and little organisms, including crabs.







A Clark's grebe floats in the bay.





Feathers.







This field trip is brought to you by the letter C.





A security camera below the Dumbarton Bridge has night-vision and motion-detection abilities, and a little windshield wiper on its main lens.





In the mud next to the bridge I find a piece of Hindu iconography, an object with a cobra, a trident and the Om symbol.  I have to wonder how on earth it got there. 





Crash barriers near the bridge.





A can of construction marking paint lies on the ground near the bridge, which recently underwent a seismic retrofitting.





These huge crash guard barrels can be partially filled.







A sign warns hunters not to mess around with their firearms.





Tiny brass buttons like salt marsh habitats.





On your mark . . .





Hunting season ended 2 months ago.  Shotgun shells litter the trail.







Overlooking a former salt evaporation pond.





Another feather in the trail, half-buried in the dried mud.





More trash on the levee.













How does one's mascara wind up in the salt marsh? 





Lots more rubble alongside the levee.







The Smithsonian Environmental Research Center's Marine Invasion Research Laboratory in Marin County (which studies patterns of invasive marine species over broad areas) seems to be asking for help. 





BFF.





Ugh, more trash.













We reach the place where the levee was breached to convert the former salt pond into a natural tidal marsh habitat for wildlife.  The breach is 80' across, and the tide has come in through it.  We must turn around and go back.





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