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Rocky Shore 

February 25, 2010

Day Three-Blowhole Peninsula and Low Arch

What a difference a day makes…yesterday we got over an inch of rain and today the weather was beautiful!

blowholeweather

We did all 14 of the quadrats and also had time to do timed searches for black and red abalones (Haliotis rufescens and Haliotis craacherodii) and ochre stars (Pisaster ochraceous).  We had help from PRBO interns, Stephen and Amanda, which made our tasks even quicker.

We found five abalones in the Queen’s Bath tidepool..  It is rare on the mainland to find a protected tidepool that is big enough to swim in….but I have seen a few on the island.  Gery swam around to look under overhangs for abalone.

geryswim

haliotis_rufescens

The water is really clear in many of the pools.  The island including the intertidal is granitic, make up of granodiorite and quartz diorite the  granitic diorite…unlike most of the reefs (Duxbury, Fitzgerald Marine Reserve and Pillar Point) near San Francisco, which are made up of soft sedimentary rock (mudstone), these rocks don’t cloud up the water with sedimentation.  Additionally, because the granitic rock is so much harder animals that bore into mudstone on the mainland, can’t do so on the island.

You can see the difference in the purple sea urchins (Strongylocentrotus purpuratus)…the first picture is from Duxbury reef (the animals are surrounded by the mudstone that has beenworn away by the combined eroding action of their spines and their feeding structure (called an Aristolte’s lantern).  The second is from Queen’s bath on the Farallones, where the rock it too hard to be worn away by their spines.

spdux

Duxbury Reef urchins-on mudstone

spqueensbath1

Farallon Island urchins-on granitic rocks

granitcsaddle

Granitic intertidal at Low Arch with mussels and a view of Saddle Rock


Filed under: Farallon Islands,Intertidal Research — rebecca @ 12:19 pm

February 24, 2010

Day Two-Monitoring in the Rain

Over one third of the world’s Western Gulls (Larus occidentalis) breed on the Farallon Islands.  It is incredible to see some many birds in one place! (but notihing compared to when all of the breeding birds are here during the summer).  These are the same gulls that star in Alfred Hitchcock’s The Birds!  They are here now, working out their territories, pooping everywhere and making lots of noise.  It looks like they are eating market squids (Loligo opalescens) because some of their dropping are really black from the ink and you can sometimes find tiny squid beaks in their regurgitated food…..

wegu

Yesterday we braved the rain and win gusts up tp 30 knots to count the invertebrates and algae out at Dead Sea Lion Cove.  We couldn’t work in this area when we were out in November because there were Steller Sea Lions hauled out on shore.  Stellars are a threatened species, so we always defer to them and let them rest where ever they choose.

One of the PRBO interns, Stephen, gave us a much needed hand…he is really a herpetologist and marine mammalogist, but we may convert him to an invertebrate zoologist yet!

In this picture Steven (black coat) and the intertidal crew, Jan-blue coat, Scott Kimura (red coat) and Gery (orange coat) are counting inverts and algae in two of our quadrats.

Gery found some pulmonate (air-breathing) limpets, Trimusculus reticulatus, on the top of an overhang while he was searching for endangered black abalones (Haliotis cracherodii).  The National Marine Fisheries Service NOAA restoration is working on a restoration plan for this snail, one of only two endangered marine invertebrates in California.  We are looking to see if there are any in the intertidal on teh island…they were seem here in the 1997, but not since….we will do thorough searches at all of our sites this week.   He didn’t find and abalones, but we got his nice picture of the Trimusculus (They are the white ‘button-like snails on the top left of the overhang above the mussels). THe weather is much nicer today…so we are of to Blowhole peninsula and hopefully Jewel Cave!  More soon…..

dslwork

dscsetupdsctrimusculus


Filed under: Uncategorized — rebecca @ 11:40 am

February 23, 2010

Day One-Helicopter, Whales and Island Changes

ggbhelo

We (Jan Roletto-Reserach coordinator at the Gulf of the Farallones National Marine Sanctuary- and I ) were lucky enough to take a Coast Guard Helicopter to the Farallones yesterday.  Our crew, Ian, Matt and Ricky were awesome.  They took us past Hunter’s Point Naval Shipyard, AT&T park, Fort Mason and over the Golden Gate Bridge.  It was a beautifully clear day.  I had never been in a helicopter and was a bit nervous, but it was fun and really fast.  We were circling the island only 25 minutes after we left the deck at the Coast Guard air station near SFO.  The guys were  just as excited as us to fly over a pod of grey whales and I got a great shot of them!

greywhalesweb

They also swung us by the north Farallon islands…..

It is amazing to see the seasonal changes on the island.  With the winter rains the Lasthenia maritima-Maritime goldfields or  ‘Farallon weed’ has really exploded.  It is so green.  Here are two pictures of the island.  The first is from last November and the next is from yesterday. The difference is amazing!

The island crew and research  focus have changed  too!  Derek, Monica, Amanda and Steven and have been out on the island for three months studying elephant seals (more later).

housesnov

Today we are monitoring at ‘Dead Sea Lion Flat’

The camera is pointed there now:

http://www.calacademy.org/webcams/farallones/

More on our super rainy monitoring next-Rebecca

housesfeb


Filed under: Farallon Islands,Intertidal Research — rebecca @ 6:05 pm

February 19, 2010

Farallones Bound!

The Rocky Intertidal Survey team, organized by the Gulf of the Farallones National Marine Sanctuary, is of to the Farallon Islands for our February sampling.  I have been running around all day gathering books, supplies and other resources.  I finally took the time to track down books and papers in the Academy libraries.  Thanks to Becky and Danielle in the library, Liz in Invertebrate Zoology & Geology and the great naturalist center staff I found some beautiful scinetific, historical and artistic writings on the Farallones.

Here is an assortment of the things I found today (This is one of the reasons I love working in a museum!)

From a collection of poems by Milton Smith Ray (Curator of the Ornithological Pacific Museum -a huge collection of nests and eggs, kept at his mansion-its for sale, check it out here) written in 1934 and used in the preface of Sarah Ward Koontz’s Master’s thesis on the sponges of the Farallon Islands.

Sea Gardens

On island merges everywhere

Save the narrow beaches walled and bare

Of pebbly shingle, shell or sand,

Swayed by the sea tides to and fro,

The dreaming gardens of the ocean grow.

With the wide retreat of the war-like wave

From rock-bound basin, cove and cave,

What hidden beauty lies revealed

That the foaming tide before concealed!

More verdant than the April mead

The skirts the island’s southern strand,

Are these bands and beds of curious weed!

With graceful ferns and subtile moss,

As fine as webs of silken floss,

Sway blooms grotesque of rarer hue

Than hand empearled with glistenin

g dew!

And here are the myriads of da

inty shells,

Asleep on the banks of weedy dells,

Or cast adrift on the sandy bars.

Like thistles huge amid the vines,

Cling the sea urchins

of unnumbered spines;

And strewn on rocky bank and bed,

Purple, dark, and richest red,

Like forlorn, forgott

urchinqueensbath

en, fallen stars.

In Sarah Ward Kloontz’s thesis she inventoried all of the sea caves on the Farallones and figured all of the sponge zonation patterns in each cave. Finally getting around to reading this, helped me identify some of the sponges we saw in Jewel Cave last year.  I was especially happy to find the name (I think)  of this crazy sponge, Stelletta clarella:

stelletta-clarella

I found a bunch of other stuff:

Maps, lists of species collected by the Farallones Research Group in the 1970s, a State Water Resources Report that resulted from those trips.  When I get back in March, I will go look at some rare books on the Farallones

we have in the Academy library.

Mildred Brooke Hoover (Herbert Hoover’s sister-in-law) and the Chair of the Historic Research Committee gave a paper on the Farallon Islands on April 5, 1932 to the National Society of Colonial Dames of America in the State of California.  Her beautiful historical account includes maps drawn by Pedro Font (a member of the Jaun de Bautista de Anza’s second expedition in 1776).  She excepts it like this (th harbour of Harbours is the SF Bay):farallontraces

Compare this to a picture of the islands….

farallones-outline

I also found a book from an old California Academy of Sciences exhibit from Wild California Hall in 1997.  I had forgotten about this exhibit, but it was a collaborative effort of the Academy, the Oakland Museum of California, the Point Reyes Bird Observatory and four local artists. We will be working at West End this time!!

Check out one example:

This is Farallones, West End, Sunset, 1995 by Tony King

My next post will be from the island!

tonyking-farallones-west-end-sunset


Filed under: Farallon Islands,Intertidal Research — rebecca @ 6:37 pm

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