Sunday, August 23, 2015

Changing of the Guard: Week One of the Fall Season


   Breeding seabird numbers are declining on Southeast Farallon Island (SEFI) as fledgling cormorants, guillemots, and puffins head to sea to ply their trades.  Western Gull chicks are still numerous, but many have fledged and total numbers are slowly decreasing.  As seabirds depart, landbird migrants are arriving in greater numbers as we move into peak migration periods for many regular migrants and rarer species from eastern North America and (we hope) further afield.

An adult Pigeon Guillemot at a nest cavity--some young are still being fed
and many fledglings are visible around the island.  Photograph by Jim Tietz
   Saturday the 15th of August saw the annual transition from the summer seabird to the fall migration crew. The sailing vessel Another Girl, captained by Jim Bewley, picked up Pete Warzybok, Liz Kain, and Daniel Johnston and headed for the mainland, while Eva Gruber remained to finish remaining seabird studies and assist the fall team for the next three weeks.  Jim Tietz, Boo Curry, and Adam Searcy arrived to begin songbird migration studies and other fall research.  They were joined by Colter Cook and Jonathan Shore, who worked on invasive plant removal and then essential maintenance duties after Cook's departure and the arrival of Ed Van Til on Outer Limits on 17 Aug.

Cassin's Auklet chick--a face that any mother should love.  Photograph by Eva Gruber

   Migration on the island was slow for the first several days, thankfully, as the fall crew was busy reviewing East and North Landing boat launch procedures, safety and awareness training, and other essential tasks required to get the fall research program up and running.  Many thanks to Jonathan and Ed who provided much help and support until their departure on 20 August aboard the U.S. Coast Guard Cutter Sockeye.

   Immediately noted by the arriving crew were the number of California sea lions on the island.  During a survey conducted on 20 August, Jim and Boo counted over 5,000 on SEFI and just over 300 on West End Island, their usual territory.  Why have they moved?  We have no idea!  Jim also counted over 800 northern fur seals including 300+ pups, an excellent count documenting the continued population increase of this species that is still recovering from a long history of fur hunting. Tufted Puffins are another species that is increasing with ~100 active potential nest sites documented this year and an impressive tally this week of 190 individuals representing the record high count for California (to the best of our knowledge).

One of our omnipresent sea lion companions.  Photograph by Adam Searcy

A Tufted Puffin from Lighthouse Hill.  Photograph by Adam Searcy

Food for Western Gull chicks became the fate for many Pigeon Guillemots and other alcids as the ocean warmed up late in the summer and became less productive. Thankfully most chicks fledged before this aquatic heat wave began.  Photograph by Jim Tietz
   Some of the first land bird migrants encountered upon the fall crew's arrival were two Eurasian Collared-Doves, a Blue-gray Gnatcatcher, Western Tanager, and Bullock's Oriole.  The Oriole stayed on the island until at least the 20th while the Gnatcatcher and Tanager departed within two days. The doves were joined by another pair, and an island record high-count of 20 Mourning Doves was counted the beginning of week two.  One of the resident Peregrine Falcons immediately went for the dove flock, so their stay on the island might be a brief one.

These two Eurasian Collared-Doves have been hanging out for a week--one with typical plumage and the other showing some abnormally white (leucistic) plumage. Photograph by Jim Tietz

   Migration began to pick up on the 17th through the 21st with decent numbers of newly arrived migrants and good diversity.  Birds seen included a Rufous/Allen's Hummingbird, Hermit, Black-throated Gray, MacGillavray's, Townsend's, Wilson's, Yellow, and Orange-crowned Warblers, Least, Pacific-slope, and Willow Flycatchers, Western Kingbird, Ash-throated Flycatcher, an early Black Phoebe, Western Tanager, Bullock's Oriole, Northern Mockingbird, Pacific Wren, House Wren, Blue Grosbeak, Lazuli Bunting, and Red-breasted Nuthatch, to name a few.

An Ash-throated Flycatcher at the lighthouse.  Photograph by Jim Tietz.
Rufous/Allen's Hummingbird (most likely the former) investigating the MLB Memorial Mallow Preserve.  Photograph by Adam Searcy 

A lovely Hermit Warbler at the Lighthouse.  Photographed by Jim Tietz

This rotund Pacific Wren was found beneath the water tank.  Photograph by Jim Tietz

One of three Red-breasted Nuthatches seen this week.  Photograph by Jim Tietz

Black-throated Gray Warbler at the Lighthouse.  Photograph by Jim Tietz




























   Also continuing for its third year is the famous Northern Gannet--joined by a Blue-footed Booby and as many as 10 Brown Boobies.  The presence of the latter species may be explained by the continuing warm water 'blob' that is persisting for its second year in the Eastern Pacific.  Numbers of Brown Boobies are also very high on islands to the south with nearly 20 having been recorded off Santa Barbara Island in early July.

   The unquestionable highlight of this migrant wave on 21 August was an Upland Sandpiper found walking about on the marine terrace near dusk, representing the 7th record for SEFI and the first since 2002 and the 31st record of this species for California. Adam Searcy was conducting an area search for migrants, when he and the sandpiper stumbled into one another.

Upland or Bartramian Sandpiper on the marine terrace.  Photograph by Adam Searcy.
   Thankfully, the rest of the crew was nearby (after chasing a misidentified Least Sandpiper) on the cart path, and everyone was able to see this stately bird. Upland Sandpipers breed broadly through the plains states of the US and Canada and into the Northeastern states as well as northwestern Canada and eastern Alaska. Their normal migratory pathway is through the Midwest and eastern states heading south to wintering grounds in central and southern South America, only rarely straying west to be detected in California.

   Weather forecasts for the next few days are good for migration, and we hope to have many more sightings to report in the near future. To better keep up with what we're seeing each day, please check out our eBird checklists and the Farallonia Flickr account.

Happy birding,
The Fall Crew






Tuesday, July 14, 2015

Whales galore!


As an intern working for Point Blue Conservation Science, I spend the majority of my time focused on the seabirds of the Farallones, but cetaceans are also an important part of the research undertaken here. Over the past two months, I have spent many hours cataloging the numbers of whales and dolphins around the islands.

The 4th of July this year was particularly eventful with 92 humpback and 21 blue whales seen in an hour! This was the highest record of the year for the more common humpback whales and a narrow 2nd highest for the less common blue whales. To add flavor to these huge numbers were three Risso’s dolphins, 18 Pacific white-sided dolphins and the first fin whale record of the year. Dozens of spouts were visible at a time, those of the giant blue whales dwarfing those of the humpbacks. The huge open mouths of the humpbacks would break the surface in groups, baleen briefly visible before the animals disappeared underwater.

Map of whales spotted off of Southeast Farallon Island from July 2-8 2015 during standard surveys. Each dot represents a whale sighting, with the size of the dot corresponding to the number of individuals in a group. While the exact location represents an estimation based on reticle, this map shows the sheer number of whales concentrated in the Gulf of the Farallones.
Numbers of both humpback and blue whales have climbed from single digits in mid-June to these unprecedented numbers. This increase is likely in response to available food in the area, in this case krill. Food is patchy in the ocean and animals that rely on it have to be able to travel great distances to find it. When it is abundant, feeding frenzies occur where many species converge on an area to access the resource. We commonly see small scale frenzies involving local pinniped and seabird species alongside migrating shearwaters and the odd albatross but usually not involving the great whales. Krill in great swarms represent one of the richest sources of nutrients and energy in the Gulf of the Farallones region and a virtual puree of these small crustaceans has attracted the whales to the area. The krill blooms are not static and the whales move with them. As evidence of this, Point Blue conducted an ACCESS cruise at the end of June where they sampled the water column in transects that ran right by the island. During this cruise krill was not abundant and large numbers of cetaceans were not reported. Additionally, the huge numbers first seen on July 4th were south of the islands, whereas the next day they were to the west and on the 7th they were predominantly north-west of us and far away. 
The left image represents humpback whale sightings and the right image represents blue whale sightings from July 2-8, 2015 from Southeast Farallon Island during standard surveys. The number of humpbacks is much larger, but there are still a large number of blue whales around.


In order to document cetaceans around the island, we use hour-long standardized whale surveys, conducted from the lighthouse, highest point of the island at 90m above sea level. They are weather dependent, and as fog shrouds the island more often than not, a comprehensive survey can only take place when visibility extends to at least (7 miles?) with low wind so the animals can be seen amongst the waves. Whenever the conditions are good, a member of the research team climbs Lighthouse Hill and methodically scans the full circle of the horizon using a spotting scope. To record data,  we use a tablet with Spotter Pro, an application developed and tested by Point Blue and other organizations concerned with marine conservation. We count individuals and record their species, as well as any behavior observed. The humpback whales are particularly entertaining to watch with frequent breaching (this is where the whale launches itself mostly out of the water creating a huge splash), tail slapping, diving, travelling and feeding among others. By pointing the tablet at the whales we can record the bearing and this is important because once we add a distance from the island and our GPS coordinates, the position of the animal can be accurately plotted on a map.


The data we collect show the areas used by whales traveling along the California coastline as well as where they congregate to feed. These maps can then be studied side-by-side with those of shipping routes in the Gulf of the Farallones and have in the past been instrumental in modifying these routes to lower the chance of ships striking whales. Not only is it a great experience to see such magnificent creatures, but the data is also used for conservation purposes. It was a great way to spend the 4th of July, it beats fireworks any day.

-Written by 2015 Point Blue seabird research assistant Edward Jenkins

Thursday, July 02, 2015

Reposting an oldie but a goodie - Murre chicks fledging

video
In response to some requests, and considering the time of year - when murre chicks will soon start fledging from the island with their dads, here's some great fledging video former intern Meghan Riley shot several years back. For more about the amazing event that is murre fledging check out this post from 2007 (old video link no longer works)
http://losfarallones.blogspot.com/2007/07/fledging-murre-chicks-take-big-leap.html

Friday, June 05, 2015

I feel the need, the need to breed.....


After celebrating it's third year "Ganniversary" on the island - commemorated in the great wooden plaque in our kitchen, our male Northern Gannet has changed it's behavior radically. Even though this Atlantic bird, the only of it's kind in the Pacific that likely traveled through an ice free Northwest Passage, can't find a mate here on the Farallones - it's breeding season hormones are definitely raging. The bird is displaying regularly and disrupting Brandt's Cormorants in their breeding colonies (see video below).


video

The bird has also been seen regularly on the mainland, travelling back and forth from the island as it did last year around this time. Even though the bird can't breed here, it is definitely feeling the urge to do so!


Tuesday, March 24, 2015

Goodbye Elephant Seals, Hello Seabirds!



March 11th marked the end of the 2014-2015 SEFI elephant seal breeding season. Pup -91 was the last to wean. This year we had 93 cows, 67 of which pupped. Of those 67, 42 successfully weaned.  When going through our data, we noticed that there was higher pup mortality this winter season. One reason for this could be that more cows pupped in Mirounga Beach, a narrow inlet that doesn’t allow for much movement during tidal surges and storms. This resulted in multiple pups being crushed or washed out to sea.

Cows and pups in Mirounga Beach

Another bit of information to take into consideration is that Andre, the bull in the area, moved between Sand Flat and Mirounga Beach rather frequently this season, which may have led to an increased movement of males and thus a greater chance of crushing pups.

Andre at the entrance to Mirounga Beach
 
This winter season was quite warm compared to previous years. During warm days, cows, pups, and weaners would often congregate in the water puddles near Breaker Cove, an inlet just below Breaker Terrace and Sand Flat. As many pups and weaners moved close to the edge to seek out cooler temperatures, they fell into the cove. Since the weaners are unable to swim at this point, those that fell in were washed out to sea.

A weaner splashing around in the water puddles near Breaker Cove
As for the other pinnipeds on the island, the number of California sea lions has increased dramatically in the past couple of weeks. It is becoming harder to access certain areas on the island without disrupting them, so we have been very cautious not to disturb them.

 
California Sea Lions between East Landing and Sea Pigeon Gulch
This past Saturday, March 14th, was the end of the 2014-2015 SEFI winter season. During our last week, we decided to make corn hole boards to leave on the island for the future interns and biologists. After many hours in the ‘carp shop’ and sewing bean bags from old pillow cases, they were finally complete. We decorated them with a spray painted elephant seal and common murre. We finished them just in time to get a few games in for ourselves.
 
Finished corn hole boards
It was hard to say goodbye, but we will forever have such wonderful memories of this past winter on SEFI.
 
SEFI 2014-2015 Winter Crew
As hard as it is to say goodbye to the elephant seals and the winter crew, we welcome the seabird season and its crew whole-heartedly. Most of the work we have done so far is maintenance and gearing up for the busy season ahead. We have been cleaning out and repairing the 447 Cassin’s Auklet boxes scattered throughout the island. We found our first Cassin’s in one of the PRBO boxes near North Landing last week, though it was without an egg.

 
Just a few of the Cassin's Auklet boxes on the island
Things should pick up as the seabird season gets underway, so check back soon for further updates!

- Written by 2015 Point Blue winter research assistant Vanessa Delnavaz

Wednesday, March 18, 2015

Tristram's Storm-Petrel back on the Farallones!

Today our 2 new interns (Sean and Eva) found this fresh storm-petrel carcass (killed by a Burrowing Owl) on our first storm-petrel predation survey of the seabird season. Upon seeing the bird, I did a double take at it’s massive size and knew immediately that this was not one of the Ashy or Leach's Storm-petrels that breed on the Farallones. After taking several morphological measurements and consulting with Peter Pyle and his extensive datasets on storm-petrel morphometrics, we have concluded this is a Tristram’s Storm-Petrel (Oceanodroma tristrami). The combination of morphological measurements collected from the specimen (including wing length, tail length and leg size) rule out all other likely species. This is a Hawaiian/Central and Western Pacific species which only has 2 previous North America records. The first of which was an individual that was caught in a mist net on SEFI in April of 2006. This is further evidence of warm water conditions in the Gulf of the Farallones this year and the corresponding occurrence of more tropical species. This specimen's unfortunate demise also highlights the challenges we face with Burrowing Owl predation on Farallon storm-petrels.
-Russ Bradley, Farallon Program Manager


Fresh Tristram's Storm Petrel carcass found on Southeast Farallon Island 3/18/2015
3rd North American Record!

Wednesday, March 11, 2015

Cetacean Watch with Spotter Pro App and ORCAS!


Whilst we focus on researching the breeding elephant seals during the winter season, there are many other aspects to our daily data collection. One of which is looking for whales and dolphins from the lighthouse. We try to carry out at least two cetacean surveys a day, although this depends on weather conditions, especially sea state, and visibility. These surveys include an hour of effort, covering 360 degrees around the island. 

Two grey whales passing by the island. This is the most frequently sighted species during the winter season as they undertake a southerly migration to calve and breed near Baja, and then turn around to start the slow journey back to feeding grounds in Alaska.

We use wide-angle binoculars with a built in compass and reticule to calculate the location of animals, a high powered scope and a trained eye to sight and confirm the identification of species. In addition to these optics, we use technology to our advantage for data recording. In place of pen and paper which are likely to blow away in some conditions, we have adopted the use of an iPad application to store sightings. Spotter Pro by Conserve IO allows us to note the species, number of individuals including if calves are present, the behaviour, and any additional information relevant to the sighting. 

 
A screenshot taken from Spotter Pro showing a Gray whale sighted near the Farallones, and a Humpback closer to the coast.


The data that is uploaded from our sightings is coupled with those of other researchers and of the general public, integrating standardized research and “citizen science”. The app can then alert ships in the area with the app to the cetaceans’ presence, allowing boat users to be extra vigilant to avoid ship strikes. The app is available on apple platforms: https://itunes.apple.com/us/app/spotter-pro-field-data-capture/id651453350?mt=8


The collected data can also be used to investigate seasonal and annual variations in occurrence of species, testing it against environmental covariates such as water temperature and tidal cycles. As mentioned in the last blog, some species are struggling to find food due to warmer waters associated with El Nino events, and anecdotally we have seen a difference in cetacean presence, with no blue whales being seen this season, compared to multiple sightings last year. It will be interesting to find out how this event affects species distribution throughout the year.
 
During a recent cetacean survey, we observed a feeding flock of several hundred gulls following approximately 400 Californian sea lions who were porpoising towards the island, fast! A huge fin cut through the water amongst the chaos, and we saw the unmistakeable eye patch of an orca.

 
The large male Orca in the group of four.



The sea conditions were perfect, so we were able to put our SAFE boat in the water at East Landing, which has recently returned to an operational state with a replacement generator. We followed the pod of four animals at a respectful and legal distance for around an hour, first going south, and then looping back towards the island until the pod moved off to the west. There was a large male, a female, and 2 smaller individuals which we think to be a juvenile and a calf. 

The adult female or juvenile animal and possibly a calf following behind.

 This was by far the best animal-related experience of my life thus far, and the whole team hasn’t stopped smiling since. We are very lucky to live in such an amazing environment where such things can happen, going from looking for birds and logging whale sightings to keeping pace with Orca on the water. The winter season ends in a week, and it has been an amazing experience which I’m sure we will never forget.

Shot of one individual passing by the island.


Written by 2015 Point Blue Conservation Science winter research assistant James Robbins.