As regular CFZ-watchers will know, for some time Corinna has been doing a column for Animals & Men and a regular segment on On The Track... particularly about out-of-place birds and rare vagrants. There seem to be more and more bird stories from all over the world hitting the news these days so, to make room for them all - and to give them all equal and worthy coverage - she has set up this new blog to cover all things feathery and Fortean.
Showing posts with label cormorants. Show all posts
Showing posts with label cormorants. Show all posts

Sunday, 12 May 2019

Salton Sea pelican population declining at startling rate


Bird populations threatened.
By: 
Posted: Apr 25, 2019 04:04 PM PDT
Updated: Apr 25, 2019 05:09 PM PDT

SALTON SEA, Calif.- - A new report paints a grim future for birds that rely on the Salton Sea habitat. Audubon California-released report uses bird-monitoring data from several different sources to show just how the destruction of the Salton Sea ecological habitat has decimated the populations of both pelicans and cormorants endemic to the area.
As the Salton Sea recedes, the body of water's salinity increases, which kills off its tilapia population. Without tilapia, the birds starve. 
According to surveys, there were approximately 20,000 American White Pelicans in 2008. According to Aerial surveys conducted by the California Department of Fish and Wildlife, that number now sits at 100. Audubon's own research backs up this decline. 

Monday, 5 June 2017

New discovery: Cormorants can hear under water

Date: May 31, 2017
Source: University of Southern Denmark

For the first time, researchers have shown that a marine birds can hear under water. This offers new possibilities for the protection of marine birds in trafficked waters. Seals, whales and other marine animals can hear under water. The cormorant also has this ability, which new research from University of Southern Denmark (SDU) shows.

According to the biologists it makes good sense, that cormorants can hear under water -- the environment where it finds most of its food.

About every tenth bird species -- ca. 800 species -- in the world hunts under water, and it may turn out that they too can also hear under water.

The sound of fish

Researchers Kirstin Anderson Hansen, Alyssa Maxwell, Ursula Siebert, Ole Næsbye Larsen and Magnus Wahlberg from the Department of Biology at University of Southern Denmark have tested the cormorant, Loke's, hearing. Loke lives at SDU's marine biology research station in the Danish town Kerteminde.

"Hearing under water must be a very useful sense for cormorants. They depend on being able to find food, even if the water is not clear, or if they live in the Arctic regions where it is dark for long periods at a time," says Kirstin Hansen, Ph.D.

Loke's hearing abilities are on a par with the hearing of the toothed whale and the seal.
 

Tuesday, 24 May 2016

Audubon calls for halt of cormorant killing after East Island nesting population is decimated


Created on Friday, 20 May 2016 13:57 | Written by Steve Law 

The Audubon Society of Portland is calling on the federal government to halt its cormorant-killing program — designed to protect endangered salmon — after news surfaced that the entire cormorant nesting colony on East Sand Island is in jeopardy.

The U.S. Army Corps of Engineers announced Thursday that the double-crested cormorant nesting colony on the island near the mouth of the Columbia River had suffered catastrophic failure. Up to 16,000 cormorants abandoned their nests, which were then attacked by gulls, crows and other scavengers, said Bob Sallinger, conservation director of the Audubon Society of Portland.

The colony collapse comes after weeks of efforts by the U.S. Fish and Wildlife Service to harass and shoot the cormorants, Sallinger said.

“Without question, they set the stage for this kind of colony collapse,” Sallinger said Friday.
Audubon has been protesting the slaughter of double-crested cormorants, who are known to feed on salmon. Audubon argues the cormorants are being used as a scapegoat when dams on the Columbia River are the key cause of declining salmon runs.


Tuesday, 10 February 2015

Proposal would kill birds to save salmon, trout

February 9, 2015

Chuck Bednar for redOrbit.com – Your Universe Online

Federal officials are proposing a radical plan to help save Columbia River salmon: killing over 11,000 double-crested cormorants that have been eating too many of the young fish.

According to a report published Sunday by Tech Times, the US Army Corps of Engineers’ plan revealed Friday would also involve spraying vegetable oil on the birds’ eggs to keep them from hatching. The plan would reduce the size of the large black seabirds over the next four years.

The cormorants have been consuming a greater-than-expected amount of salmon and steelhead trout in the Oregon area, the engineers explained. The plan, which comes in the form of a final Environmental Impact Statement, was selected over a similar plan that would result in the killing of 18,000 of the birds by 2018, the website added.

Federal studies indicate that the cormorants consume 11 million juvenile salmon and steelhead each year, according to the Associated Press. Both species are protected under the Endangered Species Act. In 1989, only 100 nesting pairs of cormorants were on the island, but that number has exploded. Currently, more than 15,000 breeding pairs of cormorants live there.

US Army Corps spokeswoman Diana Fredlund called it “a difficult situation,” telling Reuters, “We are trying to balance the salmon and steelhead vs. the birds. It’s very difficult to find the right answer and so it’s taken us a long time. We’ve had a lot of experts working on it.”


Thursday, 26 September 2013

Angling: Two opposing cormorant camps still at loggerheads

There is little doubt that the Royal Society for the Protection of Birds (RSPB) and anglers have been at loggerheads over cormorants with both sides struggling to concede to the other’s view.

From an angler’s perspective, it feels like the RSPB have dug their heels in and are choosing to ignore world-wide figures that suggest there are too many cormorants.

Angling Trust chief officer Mark Lloyd gave a host of facts and figures on a recent screening of BBC’s The One Show in favour of keeping cormorant numbers under control.

He claimed that in this country alone there are at least 30,000 of them, each consuming at least a pound of fish a day.

In response, RSPB spokesman John Knott suggested that the birds were not having much impact on current fish stocks.

He went on to blame anglers for overstocking in the first place – although he did have a point there, especially on the commercials, some of which have been heavily overstocked.

What he did not take into consideration is our river system where some of them have been completely stripped of fish.

When I was a young man our local river (Wharfe) was alive with fish with some huge shoals of dace. And venues like Boston Spa, Tadcaster and Ulleskelf were full of them.

Tuesday, 9 April 2013

Swanky San Diego beach community's thriving bird population causing a stink


SAN DIEGO –  La Jolla's jagged coastline is strictly protected by environmental laws to ensure the San Diego community remains the kind of seaside jewel that has attracted swanky restaurants, top-flight hotels and some of the nation's rich and famous, including billionaire businessman Irwin Jacobs and former presidential candidate Mitt Romney.

Tourists flock to the place. So do birds. Lots of birds. And with those birds comes lots of poop.
So rather than gasping in amazement at the beautiful views, some are holding their noses from the stench coming from the droppings that cake coastal rocks and outcroppings near its business district.

"We've had to relocate tables inside because when people go out to the patio, some are like 'Oh my God. I can't handle the smell,'" said Christina Collignon, a hostess at Eddie V's, a steak and seafood restaurant perched on a cliff straight up from the guano-coated rocks.

On a recent afternoon, tourists on spring break walked along the sea wall. Some scrunched up their faces in disgust.

"It smells like something dead," said Meghan Brummett as she looked at the birds with her husband and children. The family was visiting from Brawley, a farming town two hours east of San Diego.

Biologists say the odor is the smell of success: Environmental protections put in place over the past few decades have brought back endangered species.

Cormorants and brown pelicans nearly became extinct in the 1970s because of the pesticide DDT. The brown pelican was taken off the federal endangered species list in 2010, and its population, including the Caribbean and Latin America, is estimated at more than 650,000. The total U.S. cormorant population is about 2 million.

La Jolla is a state-designated area of "special biological significance." That means California strictly regulates its waters to protect its abundant marine life, which also attracts birds.

"We're kind of a victim of our own success," said Robert Pitman, a marine biologist at the National Marine Fisheries Service in La Jolla. "We've provided a lot of bird protections so now we're getting a lot of birds. I think we're going to be seeing more of these conflicts come about, and I think we'll have to deal with them on a case-by-case basis. I think there'll have to be compromises all around."

In Canada, guano from cormorants has been blamed for the destruction of native vegetation, while in Mississippi, catfish farmers loathe the sleek, black birds because their keen fishing skills cost them millions every year.

In La Jolla, the birds took over the rocks after the city prohibited people from walking there years ago for safety reasons. There has been little rain to wash away the feces.

George Hauer, who owns the gourmet restaurant George's At The Cove, launched an online petition that has garnered more than 1500 signatures. It states: "The cormorant colony at the La Jolla cove has reached critical mass with their excrement. The smell is overtaking the entire village. The result is a loss of business and a potential public health disaster."

Any cleaning method will require a permit, city officials say. The area is regulated by several government agencies. Washing it with a non-toxic solution would cause concern because of the run off into the ocean, state officials say. Even using just water could cause problems since guano discharged into the ocean in high concentrations would be considered a pollutant.
San Diego Mayor Bob Filner — lauded by animal lovers for placing a security camera at a nearby beach to catch anyone harassing seals there — has promised to find a fix. He wants something a solution before summer arrives and tourism peaks. He's suggesting the rocks be "vacuumed," but hasn't supplied details.

Pitman said vacuuming would not work. He personally recommends something simpler: Sounding a horn over a period of weeks to scare off the birds.

Jessica Manns said it would be a shame to see the birds relocate.

"I think they are a tourist attraction and this is a tourist area so it probably wouldn't be a good idea to try to get rid of them," said Manns, a waitress who often hears complaints about the stench wafting by the seaside tables at the Goldfish Point Cafe.

On a recent afternoon, nearby tourists snapped photos of the cormorants and pelicans standing stoically on their droppings next to seals, basking in the sun.

"I guess it's the price you have to pay for having a locale this close to paradise," said waiter Anton Marek. "I wish there was something we could do about it honestly, but it's also a part of nature. People come here because they want to see nature."

He added with a shrug: "Poop is a part of nature."

Friday, 22 March 2013

Cormorant control: it's not clear cut


BTO research into cormorant control - Inconclusive
March 2013. The UK Cormorant population has increased in size and range in recent decades, with more birds breeding and wintering inland, leading to potential conflicts with fisheries. Control measures have been introduced in response to this, with licences issued to kill up to 2,000 birds annually since the mid-2000s.

New research by the BTO has examined whether this control has been associated with changes in Cormorant numbers on Wetland Bird Survey (WeBS) sites, especially on Special Protection Areas (SPAs) designated to protect particular species under the European Birds Directive.
shag

Population reduction
Although there has been a decrease in Cormorant population growth nationally since the mid-2000s, there was no evidence that killing Cormorants one winter affected numbers at local sites the following winter. However, some results indicated that Cormorant population growth was associated with higher intensity control (although this was not seen on SPAs). One explanation for this positive relationship could be that disturbance caused by control increases Cormorant dispersal, leading to apparent population growth at the site level. Alternatively, the results may reflect the fact that control measures are often reactive, with licenses granted in response to local increases in Cormorant numbers.

Due to the potential for increased Cormorant movements following control, both at larger scales and between unmonitored and monitored sites, these findings do not provide evidence as to whether control has influenced the national population trend. Further work is needed to better monitor Cormorants outside WeBS sites and to research their population dynamics, movements and behaviour. The key questions of whether Cormorant control has the desired effect of reducing predation at fisheries, and how cost effective it is compared to other measures, remain to be answered.

Full citation: Chamberlain, D.E., Austin, G.E., Newson, S.E., Johnston, A. & Burton, N.H.K. 2013. Licensed control does not reduce local CormorantPhalacrocorax carbo population size in winter. Journal of Ornithology, doi: 10.1007/s10336-013-0938-3. 

Thursday, 6 December 2012

Birds in La Jolla Create Stench and Pollution, But They're Not the Only Ones


By Morgan Justice-Black 
As a handful of groups work quickly toward the best solution to eradicating the odor without irritating the wildlife, I Love A Clean San Diego provides other important facts on the pollution front.

Yes, the bird stench at La Jolla Cove is a big problem for businesses, tourists and residents there. While a number of experts and stakeholders are working hard to find the right solution, I Love A Clean San Diego has some additional information on animal pollution that we should all pay attention to.

Just to recap, it seems that the stench stems from more than a few big birds (pelicans and cormorants to be exact) that have found a permanent hangout at the cove safe from human interruption. The odor from their droppings is attracting most of the attention, and some have begun to raise questions about their poop triggering both a “public health disaster” and an environmental contamination issue.

The bad news is it may take some time for the best solution to be developed and agreed upon. In the meantime, with our rainy season rapidly approaching, the bird waste will wash into the water and may create a short-term water quality issue for swimmers and scuba divers, even before any human intervention takes place.