Navigation Links
Threatened birds may be rarer than geographic range maps suggest
Date:12/10/2007

. Range maps most strongly overestimate the distribution of narrow-ranging species and ecological specialists. As a consequence, species threatened or near threatened with extinction are also subject to particularly high range overestimation, on average 62 percent overestimation compared to 37 percent overestimation in non-threatened species.

The researchers study was limited to mostly temperate areas with relatively high-quality data on bird distributions. They said they expect that in the tropics, where the majority of bird species reside, but where research and data on bird distributions are more limited, that the problem of overestimating bird species ranges may be even more extensive than the scientists found for Australia, North America and South Africa.

People have been treating tropical and temperate data on bird distributions as if they are of equal quality, said Walter Jetz. But the overestimation is especially large for tropical species, which have much smaller geographic ranges, smaller population sizes, are more specialized, and are in greater danger of extinction than those in temperate areas.

Jetz and Allen Hurlbert of the National Center for Ecological Analysis and Synthesis in Santa Barbara published a related study in the August 14 issue of the Proceedings of the National Academy of Sciences, that found that range maps of birds less than 200 kilometers in area also overestimate the area of occupancy of individual species and mischaracterize spatial patterns of species richness.

Jetz added that range maps are becoming especially important for ecologists making projections of the impact of climate change on the health of specific populations and that these two studies demonstrate that conservationists need to be especially careful when making predictions about future risks to species during rapid climate change.

If were starting with a range estimate for a population that is much larger than it truly is, t
'/>"/>

Contact: Kim McDonald
kmcdonald@ucsd.edu
858-534-7572
University of California - San Diego
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Freshwater supplies threatened in central Pacific
2. Smithsonian scientists working to save microscopic threatened species
3. Research shows loggerhead sea turtles threatened by small-scale fishing operations
4. New, rare and threatened species discovered in Ghana
5. Food source threatened by carbon dioxide
6. Savanna habitat drives birds, and perhaps others, to cooperative breeding
7. Uncertainty drives the evolution of cooperative breeding in birds
8. A dog in the hand scares birds in the bush
9. City birds better than rural species in coping with human disruption
10. Do migratory birds see the magnetic field?
11. LSU professor studies army-ant-following birds
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/23/2014)... quickly. It involves visual searching for clues to ... Similarly to humans, biological systems are sometimes under ... that need to be read quickly are usually ... easier it will be to read them quickly. ... Portugal) and Centre for Molecular and Structural Biomedicine ...
(Date:4/22/2014)... -- There are all sorts of signaling strategies in ... colorful tails; satin bowbirds build specialized stick structures, called ... and European bitterling males show off bright nuptial coloration ... method to communicate with others. , ... have profound fitness implications for individuals that are either ...
(Date:4/22/2014)... (April 22, 2014) Biotechnology scientists must be ... new patent and licensing guidelines, according to a new ... , Published in the current issue of the journal ... the June 2013 U.S. Supreme Court ruling in the ... that naturally occurring genes are unpatentable. The court case ...
Breaking Biology News(10 mins):Cell division speed influences gene architecture 2Best practices in communication for the animal world 2Best practices in communication for the animal world 3New patenting guidelines are needed for biotechnology 2New patenting guidelines are needed for biotechnology 3
... people age, they may have to exercise even harder to ... of a report in the February issue of the journal ... that gives muscles a kind of metabolic boost in response ... found that so-called AMP-activated protein kinase (AMPK) slows down in ...
... male saiga antelopes at a reproductive disadvantage, says new research ... sister are born lighter than those with a brother, making ... also shows that saigas are the supermums of the hoofed ... in their offspring during pregnancy. , The study's results ...
... saw how much they had already eaten -- in this ... people who had no such environmental cues, finds a new ... those eating at a table where leftover bones accumulated compared ... men than for women. , "The results suggest that ...
Cached Biology News:Power-boosting signal in muscle declines with age 2The penalty of having a sister -- why sibling sex matters for male saiga antelopes 2The penalty of having a sister -- why sibling sex matters for male saiga antelopes 3
(Date:1/14/2014)... BETHESDA, Md. , Jan. 14, 2014  Organovo ... institutes from the National Institutes of Health (NIH) to ... more effective treatments to patients on a faster timeline. ... Translational Sciences (NCATS) and the National Eye Institute (NEI) ...
(Date:1/14/2014)... , Jan. 14, 2014  RXi Pharmaceuticals Corporation ... developing and commercializing innovative therapies addressing major unmet ... it received the Notice of Allowance from the ... unique self-delivering RNAi compounds (sd-rxRNA®), for the treatment ...
(Date:1/14/2014)... (PRWEB) January 13, 2014 Bob Hainsey, ... more than 20 years in the industry, has joined ... . Hainsey will serve as the society’s Science and ... Hainsey join SPIE as our Technology Strategist, further strengthening ...
(Date:1/14/2014)... (PRWEB) January 14, 2014 Independent publisher ... California, and Montreal, Canada, has big ideas for 2014 ... The press's goals are to produce high-quality, low-cost, DRM-free ... support local businesses. , The first major development ...
Breaking Biology Technology:Organovo Announces Collaboration with National Institutes of Health 2Organovo Announces Collaboration with National Institutes of Health 3RXi Pharmaceuticals Receives US Notice of Allowance for a Key Patent Relating to its Self-Delivering Technology with sd-rxRNAs targeting CTGF, including RXI-109, for the Treatment of Fibrotic Disorders 2RXi Pharmaceuticals Receives US Notice of Allowance for a Key Patent Relating to its Self-Delivering Technology with sd-rxRNAs targeting CTGF, including RXI-109, for the Treatment of Fibrotic Disorders 3Photonics R&D Leader Bob Hainsey Joins SPIE Technical Staff 2Bitingduck Press Looks Forward to 2014 With Multimedia E-books 2
... Yields Results and Leads to Expansion ... ... AG (Frankfurt Stock Exchange: EVT) today announced that InterMune,Inc., has signed ... InterMune,s research efforts using their medicinal,chemistry know-how. In addition, they will ...
... Gladstone Institute of Cardiovascular Disease (GICD) and the University ... time how tiny genetic factors called microRNAs may influence ... cardiac muscle. As reported in the journal Cell Stem ... Srivastava, MD, demonstrated that two microRNAs, miR-1 and miR-133, ...
... , , Not only is our body made ... tiny organelles, a variety of separate compartments that fulfill ... useful for technical applications, such as biosensors, self-repairing materials, ... possible to recreate structures with sufficient complexity in the ...
Cached Biology Technology:Evotec Expands Collaboration With InterMune 2Evotec Expands Collaboration With InterMune 3Gladstone scientists identify role of tiny RNAs in controlling stem cell fate 2Cellular construction methods emulated 2
Chicken polyclonal to HAGH ( Abpromise for all tested applications). Antigen: Synthetic peptide, corresponding to N terminal amino acids 110-260 of Human HAGH. Entrez GeneID: 3029 Swiss ...
...
Phospho- (Ser) 14-3-3 Binding Motif (4E2) Mouse mAb...
Mouse monoclonal [DJR3] to DcR1 (Phycoerythrin) ( Abpromise for all tested applications). entrezGeneID: 8794 SwissProtID: O14798...
Biology Products: