Blue on blue

  

Eric and I have been busy with lots of early morning field work recently.  As we were walking on a beach in Marin County this morning, I looked down to see a Blue Buoy Barnacle (Dosima fascicularis) attached to a By-the-wind Sailor (Velella velella).

Blue Buoy Barnacles are pelagic (offshore) barnacles that float at the surface of the ocean.  They are unusual in northern California and can be indicators of warm-water conditions, or water that's normally farther offshore coming closer to the coast.  I'll have to check my notes, but I think the last time we saw one in our area was ~10 years ago (back in 2016).

With the high numbers of Velella washing ashore at this time, the chances of finding Dosima are greater as this barnacle often attaches to Velella floats. 

We're interested in other observations of Blue Buoy Barnacles in northern California, so keep your eyes open and if you happen to come across one, I'd love to hear about it! 

P.S.  For an introduction to Blue Buoy Barnacles, see the post called "Blue buoys!" on 31 August 2014.  And more information (and a great video!) can be found in the post called "Driftin' blues" on 23 September 2014. 

On the move

  

A beautiful White Wagtail (Motacilla alba) was found near Gaffney Point in Bodega Harbor yesterday.  I took a short break from work and felt lucky to snap a few quick photos.  The wagtail was feeding along the shoreline, actively chasing after insects.

White Wagtails are accidental vagrants here.  It sounds like this is only the second record for Sonoma County, but feel free to correct me if I'm wrong about that.  

To learn more about White Wagtail records in California, you can check out the Rare Birds of California species account here. 

Color in the clouds

  

The rainbows continued today (22 April 2026).  Here's one that appeared high in the clouds over Sonoma Mountain at the end of the day.

Earth Day

  

Passing showers during the early morning of 21 April 2026 brought views of several rainbows.  Here's a quick shot to help celebrate Earth Day.

Remember to go outside today and send out thanks to the Earth.  As David Byrne says, "She's the only one we have."

Shiny and new

  

The beautiful wings of a California Darner (Rionaeschna californica).  Note how shiny and new they look.  [You can click on the image for a larger version.]  I could see this darner's wings glittering in the sun as it flew across a grassland.  When it landed nearby, I leaned in for a closer view.  Because the wings are so fresh, it's likely this individual metamorphosed recently.  Once a dragonfly has been flying for a while, the wings lose their shine and can show nicks and other impacts.

Colorful fans

  

Wow!  Eric took some striking photos of featherduster worms last weekend.  This is Serpula columbiana, a marine worm that lives in a white calcareous tube and uses its broad fan to filter food from the surrounding water.

The round, trumpet-like structure is an opercular plug.  When the fan is withdrawn into the tube, the plug seals the opening to protect the worm within.

I'm a big fan of these beautiful tubeworms, and Serpula columbiana comes in lots of different color forms, so here are two more examples:

 

 

 

 

 

Photographed in a large, fairly deep tidepool in the intertidal zone in Oregon.  Nicely done, Eric!

Sunset rainbow

  

After off and on rain showers for most of the day (12 April 2026), Eric spotted a brilliant rainbow to the southeast of Cotati at sunset.