Another great NPR video on our Sea Otter – Climate change work…
When people talk about sea otters, the words “cute,” “cuddly,” and “curious” often come to mind. But now you can add another descriptor to that list — climate change fighters.
An NPR Quest radio piece about road crossings affecting our study animals. Listen below.
SF Chronicle profile piece. The image above is a flyer for a movie inspired by the article which my graduate students will be producing.
Professor Chris Wilmers waggled the head of the fake deer in the equipment room of his UC Santa Cruz laboratory to demonstrate how alluring the contraption could be to a hungry cougar.
The purpose of the bobblehead deer – stored between a table covered with radio collars and a refrigerator full of cougar skulls, teeth, hair and scat samples – is to provoke mountain lion attacks.
This press release from Ecology nicely summarizes our recent Ecology paper in a forum discussing the fate of Yellowstone’s migratory elk.
“I think Middleton has an intriguing idea, and it might be what’s happening. We offer another hypothesis that also fits the data that they have. He says it’s climate change on the summer range and more predators on the summer range. I think it’s because there is irrigation that provides the sedentary elk with food. And I think it’s also that there is predator control outside the park,” said Wilmers.
While wolves and grizzlies have been thriving inside the park, predator control measures have intensified outside the park, Wilmers said. “My hypothesis is that in that crucial winter period, the migrants are coming down to range that the resident elk have already been feeding on all summer, and now they are competing for in the winter,” he said. To distinguish between these two stories would require hypothesis testing, he said – pitting them against each other and testing them with more data.
Read the entire press release here.
High Country News article about our lab’s work in Alaska.
… By late morning, eagles are all around us. “Look at that eagle party across the way,” says Taal Levi, a wildlife ecologist with the Cary Institute of Ecosystem Studies, whose tales of this ecological mother lode inspired Wheat’s doctoral project. He points to 50-plus eagles bunched in cottonwoods beyond the river, explaining that since they’re not breeding, they’re less territorial. “Though they do like to steal from each other.”
As if on cue, an adult chases a young bird from some bait near a remote-controlled net gun, and bingo — Lewis flips the switch. Like a starter’s pistol at a track meet, the gun’s crack sends us dashing toward our catch.
Lewis carefully extracts feathers from the netting. He pops a hood over the giant raptor’s head, covers its shiny black talons with handmade leather booties, then hands the bird to Wheat, who cradles it against her chest as she heads back to the road.
At almost 15 pounds, it’s clear we’ve got a female. She’s fearsome, with a massive hooked beak and flesh-shredding talons that curl around Lewis’ exposed fingertips after he takes off a bootie to give us a peek. Yet she sits calmly as Lewis threads a Teflon harness with the GPS under her wings and around her chest, positioning the device just behind her head. Her breast feathers feel silky and warm against the frosty air.
Wheat clips a few of them for stable isotope analysis, which ecologists have long used to infer an animal’s diet based on the levels of carbon and nitrogen. Wherever birds forage, the elements in the food suffuse their feathers as they grow. Wheat hopes the approach, tested in songbirds but not eagles, will tell her where the migrants lived and fed before she tagged them.
Read the whole article here.
It was a crazy day. A mountain lion made its way into downtown Santa Cruz, and we got a call from the police to come help them and the CA Dept of Fish and Wildlife anesthetize the cat and move it to safety. Lots of coverage on this one. Read about it in the Sentinel (with photos here), Pajaronian, Fox News, NBC News or our blog post about it on SantaCruzPumas.
Here’s a great article by Liza Gross in KQED’s Quest. It ties our recent puma work nicely together with other work on predator effects on ecosystem function.
These “top down” trophic cascades, which the ecologists dubbed “trophic downgrading,” have been documented from the poles to the equators and every major biome in between, making the loss of top predators, they wrote, “arguably humankind’s most pervasive influence on the natural world.” Earth has weathered five mass extinctions but never before at the hands of one species—human beings. And we humans seem hell bent on clearing the Earth of larger bodied apex predators.
I considered all this as I read a new paper from wildlife ecologist Chris Wilmer’s lab (published last week in PLOS ONE) that looks at how human development affects pumas. Like most large carnivores, pumas need vast territories to hunt, find mates and raise young. Pumas living in the San Francisco Bay Area have no such luck. Wilmers, an associate professor of environmental studies at the University of California-Santa Cruz, has been studying the effects of habitat fragmentation on the behavior, ecology and even the physiology of pumas around the Santa Cruz Mountains. He develops cutting-edge GPS collars to track both the location and behavior of his animals.
Fragmented landscapes often pave the way to extinction for wide-ranging large carnivores like pumas, with cascading effects. Freed from the threat of top predators, smaller carnivores like foxes increase in number, driving declines in birds and small mammals. But habitat fragmentation can produce effects similar to extinction because large predators tend to avoid small fragmented parcels. Given the heterogeneous patterns of human developments—with houses and other structures interspersed among natural areas—predicting how animals might respond, and with what consequences, presents a serious challenge.
Read the full article here.