Posts tagged colorado
Climate change: Big changes for big mammals
Jan 23rd
in mammal responses to climate change
If you were a shrew snuffling around a North American forest, you would be 27 times less likely to respond to climate change than if you were a moose grazing nearby.
That is just one of the findings of a new University of Colorado Boulder assessment led by Assistant Professor Christy McCain that looked at more than 1,000 different scientific studies on North American mammal responses to human-caused climate change. The CU-Boulder team eventually selected 140 scientific papers containing population responses from 73 North American mammal species for their analysis.
The studies assessed by the team examined seven different responses to climate change by individual mammal species: local extinctions of species known as extirpations, range contractions, range shifts, changes in abundance, seasonal responses, body size and genetic diversity. The researchers used statistical models to uncover whether the responses of the 73 mammals to a changing climate were related to aspects of their physiology and behavior or the location of the study population.
The analysis showed only 52 percent of the mammal species responded as expected to climate change, while 7 percent responded the opposite of expectations and the remaining 41 percent had no detectable response. The two main traits tied to climate change responses in the CU-Boulder study were large mammal body size and restricted times during a 24-hour day when particular mammal species are active, she said.
A paper on the study by McCain and former CU-Boulder postdoctoral fellow Sarah King was published online Jan. 22 in the journal Global Change Biology. The National Science Foundation funded the study. King is currently a research associate at Colorado State University.
While body size was by far the best predictor for response to climate change — almost all of the largest mammals responded negatively — the new study also showed that mammals active only during the day or only at night were twice as likely to respond to climate change as mammals that had flexible activity times, she said.
“This is the first time anyone has identified specific traits that tell us which mammals are responding to climate change and which are not,” said McCain of CU-Boulder’s ecology and evolutionary biology department.
McCain said she and King were surprised by some of the findings. “Overall the study suggests our large, charismatic fauna — animals like foxes, elk, reindeer and bighorn sheep — may be at more risk from climate change,” she said. “The thinking that all animals will respond similarly and uniformly to temperature change is clearly not the case.”
The researchers also found that species with higher latitudinal and elevation ranges, like polar bears, American pikas and shadow chipmunks, were more likely to respond to climate change than mammals living lower in latitude and elevation. The ability of mammals to hibernate, burrow and nest was not a good predictor of whether a species responded to climate change or not. American pikas have been extirpated from some of their previously occupied sites in the West, as have shadow chipmunks, which are in decline in California’s Yosemite National Park.
One of the most intriguing study findings was that some small mammals may shelter from climate change by using a wider array of “micro-climates” available in the vegetation and soil, she said. McCain compared the findings with the events at the K-T boundary 66 million years ago when an asteroid smacked Earth, drastically changing the climate and killing off the big dinosaurs but sparing many of the small mammals that found suitable shelter underground to protect them from the cataclysmic event.
“I think the most fascinating thing about our study is that there may be certain traits like body size and activity behaviors that allow some smaller mammals to expand the range of temperature and humidity available to them,” said McCain, also a curator of vertebrate zoology at the University of Colorado Museum of Natural History. “These areas and conditions are not available to bigger mammals that live above the vegetation and experience only ambient temperatures.”
The new study builds on a growing body of global information documenting the shifting behaviors and environments of organisms like flowers, butterflies and birds in response to a warming world, said McCain.
“If we can determine which mammals are responding to climate change and the ones that are at risk of disappearing, then we can tailor conservation efforts more toward those individual species,” said McCain. “Hopefully, this potential loss or decline of our national iconic mammals will spur more people to curb climate impacts by reducing overuse of fossil fuels.”
For more information on the ecology and evolutionary biology department visit http://ebio.colorado.edu. For more information on the University of Colorado Museum of Natural History visit http://cumuseum-archive.colorado.edu/About/directory.html.
Dinwiddie out for the season
Jan 13th
BOULDER – If the Colorado Buffaloes are to make a run at the Pac-12 Conference regular-season championship and earn a school-record third consecutive NCAA Tournament berth, it will have to be done without point guard Spencer Dinwiddie.
The 6-6 junior’s 2013-14 season is over, ended by an ACL injury that will require surgery when swelling subsides in his left knee. The injury was suffered in the first half of Sunday afternoon’s Pac-12 Conference loss at Washington, and the prognosis that the Buffs and their fans dreaded was delivered Monday afternoon when Dinwiddie underwent a magnetic resonance imaging (MRI) exam.
“It’s a big blow for him . . . he’s worked so hard to put himself in the position he has and help lead this team to where we are today,” CU coach Tad Boyle said. “To have that all taken away from you in one basketball play is . . . it’s tough.”
It was equally tough, Boyle said, for Dinwiddie’s teammates: “They’re hurting. No. 1, we’ve got a close, tight-knit team. We’ve got great chemistry on this team. Guys care about each other. From that standpoint, the team’s hurting. There’s no question in my mind they’re a resilient group of guys, high-character guys. One guy goes down the opportunity for two or three more opens. We’re going to control what we can control, which is our attitude and effort every day in practice. That’s all you can do in life.”
After Sunday’s game, sophomore post Josh Scott called Dinwiddie “a big part, not the whole part, but he’s a big part of what we do. It’s just an adjustment and we’re going to have to figure out how to do that without him.”
Dinwiddie can expect a complete recovery, said Boyle, but he refrained from offering a timeline because the rehabilitation of ACL injuries differs from athlete to athlete. After receiving the news, said Boyle, Dinwiddie was “great . . . he’s controlling the things he can control – which are his attitude and effort. Get the swelling out of the knee and the surgery will happen when the doctors feel it’s appropriate. Then the rehab starts.”
Boyle credited Dinwiddie for his maturity, noting the player was “handling it very well. He’s going to be better because of it. He’s going to have a full and complete recovery. That’s the good news. It’s not a situation where he’s going to come back and be 80 percent. He’s going to be 100 percent when he comes back, whenever that is. I don’t know how long, I don’t know what the time frame is in terms of the recovery. It’s not going to be an easy rehab, but he’ll be fine.”
So, too, might be the Buffs – if they understand their top scorer and floor leader can’t be replaced by a single player. Boyle used the analogy of CU having to replace last season’s No. 2 nationally ranked rebounder when Andre Roberson declared himself eligible for the NBA Draft. The 2013-14 Buffs, said Boyle, are a better rebounding team than last season because that role has been taken on by committee.
“Everybody thought we’d have trouble rebounding because Andre’s gone, and guess what?” noted Boyle. “We’re a better rebounding team today than we were last year with the second-best rebounder in the country on our team. So everybody stepped up and everybody has to do that with Spencer out. Not one person is going to replace him . . . with everybody stepping up their game up a little bit, we can lessen the blow.”
Dinwiddie, of Woodland Hills, Calif., was CU’S leader in scoring (14.7 ppg), assists (64, 3.8 apg) and steals (26, 1.5 spg). He also led the Buffs in 3-pointers (26) and free throw shooting percentage (85.7).
In his 21/2 seasons, Dinwiddie already had worked his way into the top five in two CU career categories – No. 3 in free throw percentage (420-of-506, 83 percent) and No. 4 in 3-point field goal percentage (115-of-298, 38.6 percent). He had been recognized nationally, making the Top 50 watch lists for the Cousy, Naismith and Wooden Awards.
Boyle said the Buffs, who meet UCLA on Thursday at the Coors Events Center (6 p.m., Pac-12 Network), will focus on that game and not how they must adapt to Dinwiddie’s loss over the next two months. “What I told the team is that we don’t have to beat every team without Spencer,” Boyle said. “We have to figure out a way to beat UCLA without Spencer. That’s all we’ve got to do. Nothing changes in our preparation and in what we’re going to try to do. We’re down a man and everybody else has to step up.”
Beginning with the Bruins, the only Pac-12 opponent the Buffs have not defeated (0-2), Boyle said Dinwiddie’s injury is of little consequence to the rest of the league: “Nobody . . . really cares. They’re not going to take pity on the Buffaloes. I can promise you that. UCLA is going to come in there Thursday trying to get a road win. We’ve got to make sure we compete our tails off, scratch and claw, do everything we have to do to try to beat them.”
Figuring to share Dinwiddie’s minutes are freshman Jaron Hopkins, who already has logged more court time than any of Boyle’s first-year players, and sophomores Xavier Talton and Eli Stalzer. Said Boyle: “All three capable of taking care of the ball and getting us in our offense . . . they’re good team guys who shoot it, dribble it and pass it.
“We don’t have the star system here. Spencer was our leading scorer and leading assist guy, he led us in steals. There’s no question he was important to our team. I’m not trying to minimize this loss, but I just want our players to realize they’re here for a reason: they’re capable as well. When one guy goes down, the door opens for one, or in this case, maybe two or three more.”
Dinwiddie went down when his left knee buckled with 2:51 left in the first half at Washington’s Alaska Airlines Arena. No other player was around him. At the time, CU was leading 25-22, and Dinwiddie had scored seven points, with one assist.
At halftime, the Buffs still led 29-26, but with Andrew Andrews and C.J. Wilcox opening the second half with 3-pointers, the Huskies outscored the Buffs 6-1 in the first 2 minutes and took a 32-30 lead. CU never caught up and suffered its first Pac-12 loss of the season, 71-54.
Wilcox, guarded mostly by Dinwiddie in the first half and held to 10 points, erupted for 21 in the second half – including 13 in the first 6 minutes – and finished with a career-high 31.
In Monday’s national polls, the Buffs (14-3, 3-1) slipped from No. 15/17 to No. 21 in the Associated Press weekly rankings and No. 22 in the USA Today/Coaches Poll. CU has been ranked for six consecutive weeks in the AP poll – the longest since eight straight weeks in 1997 – and for five consecutive weeks by the coaches.
-COLORADO-
Andrew Green | Assistant Director Sports Information
CU WBB get’s out of California 1-1
Jan 6th
LOS ANGELES – No. 12/14 Colorado erased a late nine-point second half deficit to edge UCLA, 61-59, Sunday night at Pauley Pavilion.
Jen Reese scored 15 points and Jamee Swanhad nine points and nine rebounds giving the Buffaloes (11-1, 1-1 Pac-12) a conference opening-weekend road split of the Southern California schools.
Trailing 52-43 with 6 minutes, 20 seconds left, the Buffaloes clamped down on defense and held the Bruins scoreless for the next 4:06 as CU embarked on a 10-0 run.
Reese started the run off with a made free throw. She missed the second but Swan corralled the layup and scored to cut the Bruins lead to six.
UCLA (7-8, 1-2) missed three straight shots and had a couple of turnovers as the Buffaloes whittled the lead down to 52-48 with 4:09 left on a pair of Ashley Wilson free throws.
After two more defensive stops, Arielle Roberson drilled a long two-pointer at the top of the key at the 2:53 mark.
On the next possession, Brittany Wilson tied up Thea Lemberger with the arrow in the Buffs favor.
Brittany Wilson was fouled and hit one of two free throws to cut the UCLA lead to one at 52-51. She missed the second one, but the scramble for the ball fell out of bounds in CU’s favor. Wilson then drove the lane and scored on a layup in traffic as CU regained the lead at 53-52 with 2:32 left.
UCLA’s Luliana Livulo hit a couple of free throws at 2:14 as the Bruins briefly retook the lead. But Reese hit a jumper at the top of the key, in the exact same spot as Roberson’s earlier jumper, to give Colorado a 55-54 lead with 1:55 left. After a defensive stop for CU, and both teams swapping turnovers, Swan scored on a layup for a 57-54 lead.
The Buffaloes kept the Bruins out of reach at the free throw line. Lexy Kresl hit a pair to extend the lead to five. UCLA’s Nirra Fields, who led all players with 23 points, countered with a layup. She was fouled and hit the subsequent free-throw to cut the CU lead to 59-57 with 16 seconds left.
Brittany Wilson was fouled immediately and hit one of two from the line to up the CU lead to three. Lemberger attacked the rim and scored with eight ticks left to knock the lead back to one at 60-59.
Wilson again was sent to the line and again hit one of two. With no timeouts left, Lemberger hustled down the floor took a contested runner in the lane. Livulo grabbed the offensive rebound but her put back fell short at the buzzer.
Jasmine Sborov had 11 points and eight rebounds for the Buffaloes. Atonye Nyingifa had a double-double for the Bruins with 13 points and a game-high 11 rebounds.
Colorado returns home to host the Bay Area schools next weekend. The Buffaloes will have their Pac-12 home opener on Friday, Jan. 10, by playing California at 8 p.m. Colorado will then face Stanford on Sunday, Jan. 12, at 3 p.m. Both games are scheduled for the Pac-12 Network.