Navigation Links
Sky islands: metaphor or misnomer?
Date:8/13/2008

The term "sky islands" sounds intriguing, but it may be more lyrical than useful when discussing mammal distributions, according to new research from Eric Waltari of the Sackler Institute of Comparative Genomics at the American Museum of Natural History and Robert Guralnick from the University of Colorado at Boulder. The team used an emerging technique, ecological niche modeling, to show that the populations of small mammals living on mountaintops in the Great Basinon islands in the skyare not as isolated as previously thought.

"Niche modeling is a quick and straightforward approach to addressing problems that molecular data will eventually solve," says Waltari. "Are the animals on 'sky islands' isolated?"

The answer is no. "Sky islands" is a biogeographical term that was coined to describe the habitats of species living high on mountaintops, habitats thought to be solidly isolated. In the new paper published in the early online version of the , Waltari and Guralnick test the concept of geographic isolation on thirteen species of jackrabbits, shrews, ground squirrels, and other small mammals. The species chosen have detailed location records that were mapped with current and past climate data, such as temperature and rainfall, to "backcast" the distribution of each species at the height of the last ice age 21,000 years ago. The predictions of the model are calibrated with known fossil records. Backcasting allows researchers to test whether species had wider ranges or different distributions in the past; the current study, for example, found that most of the species (12 of 13) lived at lower elevations 21,000 years ago and that the average distribution of each species was larger than it is now.

Determining the area that species inhabited in the past helps researchers understand current population distribution within the western U.S.'s Great Basin and potential linkages between "sky islands," links that ca
'/>"/>

Contact: Kristin Phillips
kphillips@amnh.org
212-496-3419
American Museum of Natural History
Source:Eurekalert

Page: 1 2

Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/30/2014)... October 30, 2014 – Bacteria in the gastrointestinal ... for digestion. Yet, these same bacteria can induce ... they penetrate the gut and enter the bloodstream. ... to protect the body, chronic or systemic inflammation ... research has established the involvement of inflammatory processes ...
(Date:10/30/2014)... | Heidelberg, 30 October 2014 Biological membranes are ... understanding of adsorption of solution ions onto lipid ... Now, a new study provides a quantitative description ... solution ions. Joanna Kotyńska and Zbigniew Figaszewski from ... of a study describing these findings, just published ...
(Date:10/29/2014)... released by unconventional oil and gas production are well ... in the open access journal Environmental Health . ... found. The study is the first to be based ... sites and could be used to supplement official air-quality ... reserves that do not readily flow to the surface. ...
Breaking Biology News(10 mins):Breakdown in gut barriers to bacteria may promote inflammation and craving in alcoholics 2Ion adsorption matter in biology 2Air quality and unconventional oil and gas sites 2Air quality and unconventional oil and gas sites 3
... stage is set for the local fauna! ,Computer scientists ... birdsong archives of Berlin,s Humboldt University, have developed a kind ... with entertainment, but a lot to do with the protection ... reliably recognise the characteristic birdsong of different species of birds, ...
... drop to dangerously low levels in diseases such as ... critical cells, doctors filter platelets from donated blood, but ... infections and cause other side effects in patients who ... scientists have been trying to generate platelets from embryonic ...
... on opposite sides of a canyon have evolved to cope ... or cell membranes. Scientists have found that bacteria change these ... looking at the appearance of the bacteria as well as ... August issue of Microbiology , will start a new ...
Cached Biology News:Birdsong not just for the birds 2Bacteria reveal secret of adaptation at Evolution Canyon 2
(Date:10/30/2014)... , October 30, 2014 Investor-Edge ... Inc. (NYSE MKT: ONVO), Medivation Inc. (NASDAQ: ... Synthetic Biologics Inc. (NYSE MKT: SYN), and Ironwood Pharmaceuticals ... can be accessed at: http://investor-edge.com/register . ... at 4,549.23, down 0.33%, the Dow Jones Industrial Average ...
(Date:10/30/2014)... Chicago, Illinois (PRWEB) October 30, 2014 ... Regenerative and Cellular Medicine Showcase in Chicago, leading ... and Orthopedic Surgeon, Dr. Wade McKenna presented talks ... Effectiveness and Orthopedic Surgical Applications For Stem Cells. ... of amniotic membrane and the properties of AlphaGEMS ...
(Date:10/30/2014)... Spartan Bioscience announced today that Health Canada has ... detects CYP2C19 genetic mutations in less than 60 minutes ... CYP2C19 System is the first near-patient DNA test for ... to the system’s ease of use, Health Canada has ... such as doctors, nurses, pharmacists, and laboratory technicians, in ...
(Date:10/30/2014)... , Oct. 30, 2014 Isis Pharmaceuticals, Inc. ... today announced that management will present a company overview at ... 8:30 a.m. ET in Boston, MA. ... available on the "Investors & Media" section of the Company,s ... the Isis website within 48 hours and will be archived ...
Breaking Biology Technology:Biotech Equities Movers and Shakers - Organovo Holdings, Medivation, Pharmacyclics, Synthetic Biologics, and Ironwood Pharma 2Biotech Equities Movers and Shakers - Organovo Holdings, Medivation, Pharmacyclics, Synthetic Biologics, and Ironwood Pharma 3Biotech Equities Movers and Shakers - Organovo Holdings, Medivation, Pharmacyclics, Synthetic Biologics, and Ironwood Pharma 4Biotech Equities Movers and Shakers - Organovo Holdings, Medivation, Pharmacyclics, Synthetic Biologics, and Ironwood Pharma 5Riordan-McKenna Institute Founders, Neil Riordan, PhD and Orthopedic Surgeon, Dr. Wade McKenna Present at the Mid American Regenerative and Cellular Medicine Showcase 2Riordan-McKenna Institute Founders, Neil Riordan, PhD and Orthopedic Surgeon, Dr. Wade McKenna Present at the Mid American Regenerative and Cellular Medicine Showcase 3Riordan-McKenna Institute Founders, Neil Riordan, PhD and Orthopedic Surgeon, Dr. Wade McKenna Present at the Mid American Regenerative and Cellular Medicine Showcase 4Health Canada approves first near-patient DNA test for personalized medicine 2Health Canada approves first near-patient DNA test for personalized medicine 3Isis Pharmaceuticals to Present at the Nomura Biotechnology Conference 2
... Society, an,international association focused on endocrinological research and,practice, today ... ENDO 08, the annual conference of the Society, which ... over 14,000 members from 80,countries, many of whom attend ... research and clinical care., The purpose of today,s ...
... industry, academia, government and health providers draws dozens of ... ... June 16 The unique connectivity, talent and,collaboration that has ... in recent years will be on show at BIO 2008 ...
... today announced,the appointment of Jim Meade, Ph.D., ... addition to contributing to the strategic direction ... for managing the development of,Lentigen,s partnerships, stakeholder ... and other key aspects of,corporate development., ...
Cached Biology Technology:'Breakthroughs Ahead,' Endocrine Society Tells Security Analysts 2Scotland Showcased at BIO as Dynamic, Global Life Sciences Hub 2Scotland Showcased at BIO as Dynamic, Global Life Sciences Hub 3Lentigen Appoints Jim Meade as Vice President of Corporate Development 2
... Agencourt offers pre-validated ... over 1500 amplicons within ... serine/threonin kinases, and more ... These assays were ...
Glycerol-based mounting medium for immunofluorescence microscopy. Formulated to retard photobleaching of fluorochromes such as fluorescein and rhodamine. Product can also be used as a diluent for fl...
... Mouse anti-Yersinia pestis F1 antigen, ... Applications: ELISA: Use at ... at an assay dependent dilution. WB: ... Predicted molecular weight: 18 kDa. Not ...
Anti-Phospho-JKK/SEK1/MKK4 pAb Description: 100 g rabbit polyclonal antibody. Reacts with human/mouse/rat. Tested in WB. Research Focus: signal transduction Storage: -20C Shipping Tem...
Biology Products: