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Sunday, September 24, 2017

Neighborhood kites

Lots of chores today, so not much time for pictures.  But here are a couple of kite photos from the past week.

Circling overhead on the way to the roost site:



Gathering in one of the tallest trees on our streetHow many kites can you find?  (Hint: Some are on the far side of the tree.)  Click on the photo for a larger version:



I'm sure about 8 kites, and there might be 9 (see below):


Saturday, September 23, 2017

One cell at at time

Several days ago, Peter was showing me some algae that he had collected on the tidal flats in Bodega Harbor.  When he picked it up, a small nudibranch-like animal was left behind in the tray.  I was intrigued because it didn't look familiar to me.  

When we looked at the animal under the scope, we realized that it wasn't a nudibranch, but a sacoglossana group that is sometimes known as "sap-sucking sea slugs."  From the name, perhaps you can guess that sacoglossans eat algae.

Here's one of the first views we had.  Note the small, black eyes and the large, rolled rhinophores above the eyes:



There are many projections called cerata on the backcylindrical, greenish, with scattered gray flecks and white tips:



On the underside, you can see a smooth muscular foot with irregular black splotches (creating a marbled pattern):



Meet Aplysiopsis enteromorphae!

While we watched, the most striking thing about this species was its feeding behavior.

Aplysiopsis enteromorphae is known to feed on only a few species of seaweeds.  (This individual was feeding on Chaetomorpha.)  The feeding behavior was described originally by Gonor (1961).  The slug grasps the algal filament with the front of its foot and a pair of oral lobes (see diagram below).  It slices open an algal cell with a single row of teeth on its radula, sucks out the contents, and then repeats this process along the filament.  After the filament passes by the mouth, it's easy to see the now-empty algal cells! 

Modified from Gonor, J.J.  1961.  Observations on the biology of Hermaeina smithi, a sacoglossan opisthobranch from the West Coast of North America.  Veliger 4: 85-98.


 This is exactly what we saw:



Here's an even closer view.  Look for the solid green algal strand in front of the mouth (at the bottom of the photo), and the nearly-clear algal strand after it leaves the mouth and passes along the foot.  The eaten portion of the strand is a little hard to see because it's almost transparent, but there are a few green cells left:



We were curious about whether you could see the slits in the algal cells.  We couldn't with our eyes alone, so we put a strand under a compound microscope (200x magnification), and voilà!  Below, the arrows are pointing to two of the slits:



Eric was able to capture a few seconds of feeding behavior on video.  Watch carefully as the slug moves along the single strand of Chaetomorpha — grasping, slitting, and sucking out the contents.



Thursday, September 21, 2017

Crescent before the fall


Crescent moon photographed near moonset on 21 September 2017

 (just before the autumn equinox on 22 September 2017)

Happy Fall !

Wednesday, September 20, 2017

7:18 p.m.


Sunset from Cotati, 20 September 2017 

Tuesday, September 19, 2017

Surprise!


Spiny Lobster (Panulirus interruptus) molt, washed up on Bodega Head, 19 September 2017

Although we had wondered if we'd ever find a Spiny Lobster in Bodega Bay, we were surprised to look down and see this on the beach tonight.

Spiny Lobster are a southern species they are primarily found south of Point Conception, and they're most abundant off the central coast of Baja California, Mexico.  During El Niño years, they may be observed north to Monterey.  Since about 2011, molts have been discovered occasionally in San Francisco (Crissy Field) and Bolinas (Agate Beach).

There is a 2001 record for a post-larval stage Spiny Lobster in Bodega Harbor, but to our knowledge, this is the first record of an adult Spiny Lobster molt in Bodega Bay, and therefore the northernmost record for a Spiny Lobster molt on the West Coast!

Spiny Lobsters can reach a carapace length of ~44 mm in 2 years.  The molt we found was missing the carapace, but we can still come up with an estimate — see photo with ruler below:


Here's some rough, but interesting guesswork.  The carapace on this individual might have been ~50 mm long...which is a potential match for a 3-year old lobster...which is a potential match for a lobster that settled in northern California during the warm-water anomaly ("The Blob") in 2014.  We have some research to do on these measurements, but it's interesting to think about when the lobsters might have arrived on our coast.

We'd be very interested in any other sightings of Spiny Lobster molts from Point Reyes north, so let us know if you spot any washed up on the beach (and please take a photo)!

P.S.  I was curious about the scientific name.  The specific epithet "interruptus" comes from the interrupted groove on each abdominal segment.  Below, note the gap (white arrow) separating the grooves that run through the middle of each abdominal segment:


Monday, September 18, 2017

Mid-September reflections








Red-necked Phalarope (Phalaropus lobatus), feeding in a salt marsh pool along the edge of Bodega Harbor on 18 September 2017.
 

Sunday, September 17, 2017

Kites at sunset

Not much time tonight, but here are a few more pictures of White-tailed Kites just before heading to a roost site for the night on 17 September 2017.  (Click on the images for larger versions.)

A beautiful immature bird, with rusty coloration on the breast, white-edged feathers behind the "black shoulder", and gray at the back of the head.  (The eyes are also darker than those of an adult.)



Below, the immature kite turns to watch another individual trying to land nearby This is a good look at the underwing pattern (and the tail feathers being molted note the different lengths of the feathers).



A kite soaring overhead with just a hint of the setting sun:


Saturday, September 16, 2017

Late summer night

Just a few quick shots of the White-tailed Kites coming in to roost tonight (16 September 2017):

 



Since the kites fly in just before sunset, the light is quite dim.  I don't have the right camera lens for these conditions, so most of my shots are blurry, but even so, I can't help sharing this one (below).  I love that you can still see the coloration of the young bird on the rightthe beautiful rust color on the breast and the grayish cap:


There were interesting conditions and behaviors tonight.  It was one of those late summer nights that makes you want to linger outside, and the kites seemed to think so, too!  They perched high on the trees overlooking the roost site, kept circling around high above, and they stayed out until it was almost too dark to see them.

I'm so thankful for the opportunity to spend time watching kites!
 

Thursday, September 14, 2017

Path of Toad-ality

Last night Will mentioned he had seen some gorgeous toads...so how could we resist?

After work, Eric and I took a short walk in Sugarloaf Ridge State Park.  Sure enough, just after dusk, we started seeing toads along the path.

Below are a few of my favorite pictures.  These are Western Toads (Anaxyrus boreas, formerly Bufo boreas).  They ranged in size from about ~2-4" (~5-10 cm) long, shown here from largest to smallest:








This was the first time we've seen Western Toads in Sonoma County.  It was so nice to see them!  Thanks, Will, for letting us know about the wonderful toads.

Wednesday, September 13, 2017

Blue note


We were fortunate to see a few Blue Whales (Balaenoptera musculus) near Cordell Bank on 10 September 2017.  [Click on the photos for larger versions.]

Here's another example of the very long back and the very small dorsal fin (relative to the size of the whale, that is).  Compared with the first photo (above), note the slightly different shape of the fin, as these are different individuals:



Sometimes the mottled patterning on the back was visible:



Below, on the right, look for the large "splashguard" surrounding the blowholes:



From a slightly different angle:



And one more, this time of the flukes, with the impressively thick caudal peduncle, or tail stock:


For more photos and information about Blue Whales, review the following posts:

Tuesday, September 12, 2017

Splish...

 ...Splash!

During the pelagic trip on Sunday (10 September 2017), we had great looks at a group of Dall's Porpoises (Phocoenoides dalli) as they swam alongside the boat.  

Dall's Porpoises are always fun to watch, but incredibly frustrating to photograph.  They're so fast with swimming speeds up to ~30 knots (!), they're one of the fastest of the small cetaceans — and when they surface, it's usually with a very dramatic splash (often called a "rooster tail").  Mostly I end up with photographs of not much animal and a lot of splash.

Here's an example of a Dall's Porpoise surfacing:


Below, I've zoomed in so you can see different features. Dall's Porpoises are mostly black, so the bright white thoracic panel (coming up the side) stands out.  Above that you can see the triangular dorsal fin with a bit of gray frosting at the tip.  And note the small dark pectoral fin between the white panel and the head.
 


Just for fun, and because they create interesting patterns, here are some of my best Dall's Porpoise splashes of the day.  [Click on the pictures to see the finer details.]






If you'd like to learn more about Dall's Porpoises, check out these fact sheets from the American Cetacean Society and NOAA.
 

Monday, September 11, 2017

Stormy light and swirling kites

Interesting sky and weather tonight!

Dark storm clouds moved in just before sunset, accompanied by strong, swirling breezes.  The White-tailed Kites that have been roosting nearby responded by arriving at the roost site earlier than usual, soaring much higher than usual, and flying in to the roost site very fast at a very steep angle.  









It looked like there were some rain showers up high:



And then some intriguing rainbows surrounded by a rosy blush appeared to the east:



Not too long after, the sun lit up the western clouds:


It's raining now.  Will there be thunder tonight?
 

Sunday, September 10, 2017

Wake rider


Pacific White-sided Dolphin (Lagenorhynchus obliquidens) riding the wake of the New Sea Angler near Cordell Bank on 10 September 2017.

Saturday, September 9, 2017

Might as well jump


I spent a few minutes watching a Least Sandpiper (Calidris minutilla) today.  Occasionally, it paused.  Most of the time it was busy looking for food, especially beach hoppers.






Sometimes, the sandpiper was successful in capturing prey.  In the photo below, there is small beach hopper in its bill (close to the tip).  [Click on the picture for a larger version.]



Sometimes, the beach hopper was successful in avoiding capture.  Below, look for the beach hopper escaping via a jump to the right!