The rain ended, the sun came out, and so did the harbor seals at Alameda Point. So many of them came out of the water to warm up on their new float on January 5, hardly any of the structure was visible. The number has many observers asking for a second float.
The regional ferry agency installed the new float after removing an old Navy dock used by the seals, in order to make way for a ferry maintenance facility.
“I nearly keeled over when I saw the platform,” said Lisa Haderlie Baker, harbor seal monitor and Alameda resident. “So many seals packed cheek by jowl, literally, that I had to count them four times using binoculars to make sure there were 60 of them, at least, basking in the sun, which I knew had to be close to a record. It was a tremendous thrill.” Continue reading “No vacancy on float for harbor seals”
Location, location, location! But for a fenced-off dilapidated navigation light stand on a jetty at the Seaplane Lagoon, ospreys would not have had a successful nesting season this year.
In late August two adult ospreys took flight from their Seaplane Lagoon perch for parts unknown with two healthy offspring. It was a welcome sight because for the past three years a series of frustrating avian soap operas featuring other ospreys and unwanted nesting attempts aboard the maritime ship Admiral Callaghan were marked with failure. Previously in 2012 they had raised one chick, the only other recorded case of osprey reproduction at Alameda Point.
A new concrete float for harbor seals was delivered to Alameda Point on June 22. It is the first-of-its-kind on the West Coast. With seals starting to use the new platform, a milestone has been reached culminating two-and-a-half years of citizen advocacy to maintain a resting site for harbor seals at Alameda Point. A ferry maintenance facility is slated to begin construction this summer where the seals have been finding solitude for over a decade. The new float will be anchored 300 yards away to the east.
In an effort to acclimate the seals to their new float and surroundings, the float is being moved in stages to its permanent location. It will be anchored a hundred yards offshore from the Bay Trail near the soccer field on West Hornet Avenue.Continue reading “Harbor seals adapting to new float”
Conservation of wildlife isn’t just important at Crab Cove
Visitors flock to Crab Cove, a State Marine Conservation Area, to learn about and experience the Bay’s sea dwellers. The educational lessons at the Crab Cove Visitor Center are equally relevant throughout the waterway south of the USS Hornet at Alameda Point where even more creatures thrive in relative obscurity.
The area encompasses an interconnected web of vegetation, birds, seals, fish, mollusks, crustaceans and worms. Ghost shrimp, bat rays, leopard sharks, striped crabs, mussels, California sea hares and fish with light-emitting diodes are just a sampling. A 36-foot-wide rock wall, known as a breakwater and built by the Navy in 1945, forms the mile-long southern boundary.
Three thousand tons of sand was added to the nesting grounds for the least terns at Alameda Point in late February and early March. In the weeks that followed, volunteers from St. George Spirits and the Boy Scouts and Cub Scouts came out to help make the site ready for the arrival of the terns in mid-April.
The Water Emergency Transportation Authority (WETA) paid for enough sand to cover half of the 9.6-acre nesting area with three inches of sand, as well as for grading. The weeklong delivery of sand was a conservation mitigation requirement for the impact that WETA’s new ferry maintenance facility will have on the terns’ feeding area. As many as 12 ferries will make up to four passes per weekday through the Alameda Point Channel where the terns frequently dive for small fish.
Wind and water erosion take their toll on the sand substrate lying atop old airfield taxiway pavement, requiring periodic replenishment. This latest delivery of Angel Island coarse sand has built up the sand depth on much of the site to the point that it’s starting to feel like a real beach underfoot. Beaches are the traditional nesting habitat for terns.Continue reading “Ferry agency, volunteers help the least terns”
The Water Emergency Transportation Authority (WETA) is aiming for the delivery of a new dock for harbor seals at Alameda Point as early as April, ahead of the start of construction of its new ferry maintenance facility this summer.
Because the maintenance facility’s new berthing dock would displace the seals’ current resting spot, a provision was approved for a new harbor seal dock as a condition for permitting the new facility. WETA, the city council, and the Bay Conservation and Development Commission (BCDC) approved the provision at the urging of community activists.
WETA issued design specifications for its 12-berth maintenance facility and administrative offices to prospective contractors in December. It expects to award the contract on March 31, with work commencing as soon as May 6. The estimated cost is pegged at $45 million, $9 million of which is for design work and the remaining $36 million going for construction, according to Chad Mason, senior planner at WETA. Funding for the project is coming from federal, state, and regional funds.
The facility will include a 70-foot-tall four-story building and is expected to be complete in 2018.
The project will also fund other benefits, among them, a new water line from Main Street, park enhancements, and sand for the least tern nesting area on the airfield.
WETA will construct a shoreline viewing terrace, bicycle parking, interpretive signage, improved lighting and landscaping, and seating on an adjacent half-acre of parkland on West Hornet Avenue.
WETA will also be providing some assistance for the California least terns, an endangered bird species that nests at Alameda Point and dives for fish in surrounding waters. As a mitigation for the impacts of the new ferry traffic on the terns’ foraging waters, WETA will be delivering enough truckloads of sand to the terns’ nesting area on the airfield in February to add a few inches of depth. Erosion of the 9.6-acre beach-like nesting landscape necessitates periodic replenishment.
The replacement harbor seal dock, also referred to as a haul-out, will be the first time such a structure has been built on San Francisco Bay specifically to retain or attract harbor seals. It will be located a short distance to the east of the old dock. Time will tell whether this experimental effort is successful.
“Meeting the permitting requirements for the new harbor seal haul-out is underway,” said Mason. BCDC is the state permitting agency for all Bay shoreline and in-water projects. It requires assurances from other agencies that the harbor seal dock does not introduce any unwanted environmental impacts before granting approval.
“With the help of the environmental consulting firm Dudek, the harbor seal haul-out is on a fast-track approval timeline,” said Mason. “The only regulatory delay is due to the herring spawning season. Regulations require that the pilings for the new haul-out be installed after the end of the herring spawning season in late March of 2016.”
“We are currently reviewing two options for providing the new harbor seal haul-out: Build a new one from scratch, or modify an existing mobile dock if we can find one that meets our needs,” said Mason. “We hope to issue the contract for the haul-out in January.” WETA will be responsible for constructing, maintaining and replacing the harbor seal dock when necessary for the 60-year term of its lease.
WETA has been working with a citizen advisory group of local harbor seal advocates who spearheaded the effort for the new haul-out. The group gained the support of the Sierra Club and the Audubon Society. The location for the new seal dock was chosen with the help of marine mammal expert Dr. Jim Harvey, Director of California State Universities’ Moss Landing Marine Laboratories.
This winter, the seals favor the afternoon for getting out of the water. Their numbers can vary from a dozen to a recent high of over three dozen. It is the only haul-out site in the East Bay between Yerba Buena Island and the marshlands of Fremont and Newark near the Dumbarton Bridge, both of which require watercraft for public viewing access. The seals at Alameda Point can be viewed from the Bay Trail.
About 100 California Brown Pelicans made an unusual appearance on the old wooden dock on the south side of Alameda Point near the U.S.S. Hornet on December 23. The visit provided a rare close-up view of this colorful and iconic bird, but also a reminder of their struggle to survive as a species. Only one of the pelicans could be identified as a one- or two-year-old.
During the past four years, the breeding rate for California Brown Pelicans has been dismal. This recent trend has been directly attributable to the dwindling supply of sardines along the California coast, according to a Brown Pelican status report issued in October by the Washington State Department of Fish and Wildlife. The sardine population has dropped so low that in April of 2015, the agency responsible for managing Pacific Coast fisheries banned commercial fishing of sardines until the end of June 2016.
In May, the U.S. Fish and Wildlife Service urged the same agency to consider additional management measures to stave off a decline in northern anchovy, another important food source for pelicans and other marine life.
Brown Pelicans were removed from the federal endangered species list in 2009 with great fanfare after recovering from the devastating effects of the agricultural pesticide DDT on their eggs. But they no sooner recovered from chemical contamination than they fell victim to a plunge in food supply.
“Although most essential nesting and roosting habitat throughout the subspecies’ range is protected, the California Brown Pelican has experienced unusual mortality events and a multi-year decline in breeding success since delisting, both of which appear to be due to the lack of adequate forage,” wrote the U.S. Fish and Wildlife Service to the Pacific Fishery Management Council on May 14, 2015.
About 10 percent of California Brown Pelicans nest on two islands in Channel Islands National Park off the coast of Southern California. The remainder nest and rear their young off the western coast of Mexico.
The University of California at Davis and the Mexican national conservation agency conducted a study of the 2014 nesting season off the coast of Mexico. The U.C. Davis news summary of the study results stated, “The scientists found that this year, areas that typically host hundreds or thousands of nesting pairs held only a few hundred at most, and in some cases zero nesting pairs.” Co-author of the study, U.C. Davis wildlife biologist Dan Anderson, is quoted in the story saying, “That’s what we call a failure, a bust. The bottom dropped out.” Anderson has been monitoring Brown Pelicans for 46 years.
Breeding normally begins in January. Whether the pelicans currently at Alameda Point will make the journey south is yet to be seen.
Breakwater Island along the south side of the Alameda Point Channel serves as the most popular resting site for Brown Pelicans on San Francisco Bay during the warmer months.
Immature Brown Pelicans are distinguishable by being entirely brown, except for their whitish underbelly. By their third year, the neck becomes white and the head yellow. During breeding season, the neck of adults becomes dark chestnut and the pouch under their bill becomes red.