Navigation Links
Ancient insects shed light on biodiversity
Date:2/12/2013

Simon Fraser University evolutionary biologists Bruce Archibald and Rolf Mathewes, and Brandon University biologist David Greenwood, have discovered that modern tropical mountains' diversity patterns extended up into Canada about 50 million years ago.

Their findings confirm an influential theory about change in modern species diversity across mountains, and provide evidence that global biodiversity was greater in ancient times than now.

The scientific journal Palaeogeography, Palaeoclimatology, Palaeoecology has published their research.

About 45 years ago, an evolutionary biologist at the University of Pennsylvania theorized that change in species from site to site across mountain ranges in the tropics should be greater than in temperate latitudes.

Daniel Janzen reasoned that the great difference between summer and winter in temperate latitudes (high seasonality) offers a wide window to migrate across mountainous regions. The small difference in the tropics (low seasonality) allows a very narrow opportunity, annually. Consequently, communities across tropical mountains should have fewer of the same species. Many studies examining modern communities support this theory.

Archibald, Mathewes and Greenwood realized that fossil beds across a thousand kilometres of the ancient mountains of British Columbia and Washington provided a unique lens through which to deepen evaluation of this theory. Fifty million years ago, when these fossil beds were laid down, the world had low seasonality outside of the tropics, right to the poles. Because of this, if Janzen's theory is right, the pattern of biodiversity that he described in modern tropical mountains should have extended well into higher latitudes.

"We found that insect species changed greatly across British Columbia's and Washington State's ancient mountain ranges, like in the modern tropics," Archibald says, "exactly as Janzen's seasonality hypothesis predicted.

This implies tha
'/>"/>

Contact: Carol Thorbes
cthorbes@sfu.ca
778-782-3035
Simon Fraser University
Source:Eurekalert

Page: 1 2

Related biology news :

1. Large, ancient landslides delivered preferred upstream habitats for coho salmon
2. Climate change clues from tiny marine algae -- ancient and modern
3. Genetic mystery of Behcets disease unfolds along the ancient Silk Road
4. Analysis of Marcellus flowback finds high levels of ancient brines
5. Warming climate unlikely to cause extinction of ancient Amazon trees, study finds
6. Ancient red dye powers new green battery
7. Mining ancient ores for clues to early life
8. Ancient microbes found living beneath the icy surface of Antarctic lake
9. UIC scientists find ancient microbes in salty, ice-sealed Antarctic lake
10. USAs ancient hurricane belt and the US-Canada equator
11. New ancient shark species gives insight into origin of great white
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/22/2014)... researchers in modifying properties of nanomaterials for application in ... to recent innovative studies conducted by scientists from the ... of a simple, efficient and low cost technique involving ... by Professor Sow Chorng Haur from the Department of ... the properties of two different types of materials can ...
(Date:7/22/2014)... and Shenzhen, China July 22, 2014 ... subsidiary of BGI, the world,s largest genomics organization, ... human whole exome sequencing service based on Complete ... in-depth bioinformatics analysis and SNP validation, and is ... , Complete Genomics, highly regarded in the ...
(Date:7/22/2014)... a child,s lunch box and you,re likely to find that ... Those are the findings of a study conducted by researchers ... Tufts University and in the Department of Public Health and ... findings are published online ahead of print in the ... , Led by senior author Jeanne Goldberg, Ph.D., R.D., a ...
Breaking Biology News(10 mins):NUS scientists use low cost technique to improve properties and functions of nanomaterials 2NUS scientists use low cost technique to improve properties and functions of nanomaterials 3BGI Tech launches human whole exome sequencing service on complete genomics' advanced platform 2Room for improvement in elementary school children's lunches and snacks from home 2
... factor for stroke, and its occurrence is closely related ... animals have shown that scavenger receptor class B type ... of scavenger receptor class B type I gene polymorphisms ... the exon 8 C1050T polymorphism, and these polymorphic loci ...
... During the last decade, our understanding of ... novel hypothalamic Arg-Phe-amide- related peptides, kisspeptin and ... the reproductive axis. Kisspeptins are currently recognized ... hypothalamus-pituitary-gonadal axis. Kisspeptin and its receptor, G ...
... The Bert L. and N. Kuggie Vallee Foundation announces, ... The 2013 winners are: Dr. Kirsty L. ... Molecular Biology at the Karolinska Institutet (Stockholm, Sweden) who ... fat cells. Dr. David Tobin, Assistant Professor of ...
Cached Biology News:
(Date:7/22/2014)... of rod-shaped metal nanoparticles in water with ultrasound and ... bits. Why? No one yet knows exactly. But researchers ... have clocked their speedand it,s fast. At up to ... faster than any nanoscale object submerged in liquid ever ... opened up the possibility that they could be used ...
(Date:7/22/2014)... 2014 Nuclear reactors are used to ... controlled fission chain reaction in nuclear reactors is used ... to drive a power- generating turbine. Currently nuclear reactors ... total electricity production. Nuclear reactor market is expected to ... and proposed nuclear reactor projects. , Early buyers will ...
(Date:7/22/2014)... Wisconsin (PRWEB) July 22, 2014 ... in attendance at the 2014 NCSL International Workshop ... Booth #423 will feature CONDEC pressure instrumentation, OIML ... weights, and the new, customized sets, Essential Weights™. ... to promote cooperative efforts in solving the common ...
(Date:7/22/2014)... OHAUS Corporation, a leading worldwide manufacturer ... scales, proudly announces its Explorer line of analytical ... 2014 “Readers' Choice” Award for best balance. ... was voted the best laboratory balance by the ... “excellence in product design and performance for the ...
Breaking Biology Technology:NIST shows ultrasonically propelled nanorods spin dizzyingly fast 2Nuclear Energy Market: Global Industry Analysis, Size, Share, Analysis, Growth and Forecast 2013 - 2019 2Nuclear Energy Market: Global Industry Analysis, Size, Share, Analysis, Growth and Forecast 2013 - 2019 3Rice Lake Weighing Systems Showcases Metrology Solutions for the 2014 NCSL International Workshop & Symposium 2OHAUS Explorer Voted “Best Balance” in Laboratory Equipment’s 2014 Readers’ Choice Awards 2
... Fla., March 27 Catalyst Pharmaceutical Partners, Inc. ... that acquires, in-licenses, develops and commercializes prescription drugs ... financial results for the fourth quarter and year ... 2008," said Patrick J. McEnany, Chief Executive Officer ...
... track their cholesterol and, more importantly, lower their cholesterol by putting ... modifiable risk factors for high cholesterol. , ... Melbourne, ... Cholesterol Coach onto the iTunes App Store. , ,High cholesterol ...
... which dramatically improves the sensitivity of Magnetic Resonance techniques ... has been developed by scientists at the University of ... the fuel of the space shuttle, is expected to ... condition from an MRI scan at lower cost while ...
Cached Biology Technology:Catalyst Pharmaceutical Partners Reports Fourth Quarter and Year-End 2008 Financial Results 2Catalyst Pharmaceutical Partners Reports Fourth Quarter and Year-End 2008 Financial Results 3Catalyst Pharmaceutical Partners Reports Fourth Quarter and Year-End 2008 Financial Results 4Catalyst Pharmaceutical Partners Reports Fourth Quarter and Year-End 2008 Financial Results 5Catalyst Pharmaceutical Partners Reports Fourth Quarter and Year-End 2008 Financial Results 6First Application to Fight High Cholesterol Launches on the iPhone and iPod Touch 2Transforming medical diagnosis with new scanning technology 2
Caliper offers a wide array of standard LabChip products designed to be used in combination with our AMS 90 and LabChip 3000 microfluidic platforms....
... Pro260 reagents and supplies, for 10 ... sufficient to perform protein analysis with ... electrophoresis system. Supplied are 3 x ... Pro260 stain, 60 microliters Pro260 ladder ...
...
... achieve high experimental throughput, minimum input ... 4 up to 16 culture ... provides users with proven fermentation results ... yeast, fungi or any other microbial ...
Biology Products: