California's Bighorn Sheep: taking some heat for an accurate census

When you think of bighorn sheep, what image comes to mind? Nimble rock climbers? Mountain-bound and well-adapted to their environment? And so, if you felt compelled to count them, you would grab your best insulated sleeping bag, parka, and warm boots and head up the slopes, right?

Well, not so in California. In the mountain ranges of southwest California, the bighorn sheep is endangered as their populations have been threatened by habitat fragmentation, diseases from feral cattle, and predation by mountain lions. But to effectively monitor their numbers on an annual basis, the Anza-Borrego Desert State Park rangers, assisted by volunteers from The Nature Conservancy, position themselves in the blistering summer heat of the low desert to await their quarry.

Why? Because this time of year, the bighorn sheep will come down from the mountains to drink at the small watering holes along the desert's edge. That's easier for the researchers than hiking in difficult terrain. Easier, if you like 108 to 115 degrees Fahrenheit.

“This state park’s bighorn census is the most accurate feedback on how effective the recovery efforts are for the endangered bighorn sheep,” says Dave Van Cleve, the Nature Conservancy’s senior project manager for the region. “It’s a brutal job, counting sheep in this blistering heat, but it’s the most reliable method available.”

Fortunately, the news has been good. The number of bighorn sheep have been steadily increasing for the past 40 years (last year 354 sheep were counted). The census numbers provide state park management with the information to gauge the effectiveness of their conservation efforts - like removing all cattle from the park and prohibiting off-road vehicles from palm and riparian oases that provide food and shelter for the sheep.

Congrats to the Nature Conservancy for their support with the challenging annual desert census. According to the group, "The [Nature] Conservancy is actively working to weave conservation lands into a connected network for wildlife like the bighorn sheep, mountain lions and other species that need large habitats. Recently the Conservancy helped the park acquire more than 4,000 additional acres of prime bighorn sheep territory and worked with California’s Fish and Game Department to acquire 7,400 acres adjacent to the park — key habitats that will contribute to a broader corridor for the park’s large mammals."

Have a cold one on me, folks. You deserve it.

Read the article in The Nature Conservancy website.

Weekend Update: wolves, corals, and more. . .

Here is a Weekend Update on several direct or related issues that have appeared in previous posts - some good, some not so good. Click on the subject heading to see the original posting.

Wolves - Endangered Status:
This past week, the U.S. Fish and Wildlife Service put the Great Lakes wolf back on the endangered species list. This action bodes well for the pending court action to place the nearby Northern Rocky Mountain wolves residing in Idaho and Montana, which are currently subject to state-sanctioned hunting, back on the list also.

Copper Mine Expansion Stopped:
An Appeals Court voided a land trade between the Bureau of Land Management and the Asarco Corporation which would have traded 7,300 acres of private land for 11,000 acres of public land destined to allow the expansion of the Asarco copper mine. The court ruled that the trade was "arbitrary and capricious" and did not consider the environmental impact. Verizon Wireless gave a tepid response to 81k email protests regarding their support of a pro-mountaintop-removal mining rally held this past Labor Day, claiming the sponsorship was not an expression of mountaintop removal coal mining.

Desert Tortoise Relocation Thwarted:
Due in large part to public protest, the Bureau of Land Management halted the controversial relocation of over 1,000 desert tortoises, originally as part of an expansion of the Fort Irwin Army base. Relocation efforts in the past have proven fatal for many of the tortoises, but Fort Irwin is hoping to get approval from the U.S. Fish and Wildlife Service to move 90 tortoises, thereby defying the Bureau's action.

CO2 at 350 ppm Emphasized by UN Scientists:
Member scientists of the U.N.'s Intergovernmental Panel on Climate Change again emphasized the need to establish a level of 350 parts per million for carbon dioxide emissions as the base level if we are to make any real progress. They warned that any legislation, like the current U.S. global warming legislation being considered, that sets CO2 limits above 350 ppm will lead to catastrophic effects on coral reefs and other ecosystems. The U.S. bill, passed by the House, sets the limit at 450 to 550 ppm. Over 350 organizations have urged a level of 350 ppm to be the goal in the U.S. Senate's version of the bill.

Endangered Species Waiting List:
And, as a final aside, according to the Center for Biological Diversity, there is a waiting list for species in need of Endangered Species List protection. Held back because of bureaucratic inefficiency or "higher priority" federal programs, the list includes 100 species that have been waiting for more than a decade and 73 have been waiting for more than a quarter-century. And apparently this bureaucratic quagmire has contributed to the extinction of 83 plants and animals between 1974 and 1994. The new Obama administration has said it will address a current backlog of over 250 species, but the proof will lie in the results.

Thanks to the proactive Center for Biological Diversity for the photos and info.

California Desert Tortoise: under the gun of the U.S. Army

The US military does not exactly have a sterling record when it comes to balancing the concerns of military training and wildlife conservation issues. The controversy over Navy sonar tests and the effects on ocean mammals is still ongoing. And we also have one brewing in California involving the endangered desert tortoise.

The Army wishes to expand its tank training operations in the Mojave desert outside of Ft. Irwin and this encroaches on the federally designated critical habitat for the desert tortoise, a reptile technically listed as threatened by the IUCN. In 2008, under the previous administration, the U.S. Fish and Wildlife Service granted permission to move 650 tortoises as part of a phase approach; the total number to be moved was to be 2000.

So far, the results have not been promising for the tortoise as many have died from predation by coyotes. Nature establishes habitat boundaries in several ways: sometimes through restricting vegetation/food sources, sometimes through geological limits - like temperature ranges, and sometimes through bio-dispersion based on predation. Move an animal out of its normal locale and anyone of these or other factors can have disastrous effects.

While the results of the first phase have not been all together successful, the Army is still pushing ahead with their plan. But they are meeting resistance from several conservation organizations, including the Center for Biological Diversity - that perennial environmental watchdog that seems unafraid to take government agencies to task in the courts.

One of the oldest residents in California is faced with what could be a fatal eviction for the sake of developing more deadly artillery. You can read more about this in the Los Angeles Times and at the Center for Biological Diversity, which is running both a public awareness campaign and a legal battle.