Navigation Links
The decoding of slowness
Date:7/19/2011

This release is available in German.

They live their lives upside down; instead of defying the force of gravity in an upright position, sloths spend most of their lives hanging in trees upside down. If they have to move, they do so only slowly. Very slowly. But why are sloths so 'lazy'? And how has the locomotive system of these outsiders adapted to their unhurried lifestyle in the course of evolution? Zoologists of the Friedrich Schiller University Jena (Germany) have looked into the matter comprehensively.

"To our great surprise the locomotion of the sloths is basically not so different from the locomotion of other mammals, like monkeys for instance, which instead of hanging from tree branches, balance along them", says Dr. John Nyakatura. In his doctoral thesis at the Institute of Systematic Zoology and Evolutionary Biology with Phyletic Museum the evolutionary biologist analyzed the locomotion of sloths with X-ray video equipment. That was not so easy at the beginning, as the first sloth stepping in front of the camera for the Jena scientist simply refused to work. "Mats, the sloth, just didn't want to co-operate", Nyakatura remembers, smiling. Therefore it was given to a zoo and made headlines around the globe as the 'laziest animal in the world'.

In comparison, the two-toed sloths Julius, Evita and Lisa appeared to be more co-operative. They brachiated along the provided pole in the X-ray tube. "The position of their legs and the bending of their joints matches exactly those of other mammals in the process of walking", Nyakatura explains. Hence one could imagine the locomotion of sloths actually as 'walking' under a tree. Just much slower than other quadrupeds.

However, the evolutionary biologist found distinct differences in the anatomical structure of the animals. "Sloths have very long arms, but only very short shoulder blades (scapulae), being able to move freely on top of a narrow, rounded chest. This lends them a maximum radius of movement". Moreover a dislocation of certain muscular contact points occurred which enabled them to keep their own body weight with a minimum of energy input. "In the evolution of the sloths the adaptation to the slow, energy saving way of movement occurred solely through their anatomy", John Nyakatura sums up. What was even more astonishing, this principle developed in two cases independent of each other: in the two-toed sloths and in the three-toed sloths. But although the outward appearance and lifestyle of the animals may lead to the assumption of them being related to each other, these two families are, from an evolutionary point of view, only distant relations.

"With their mode of life the sloths are filling an ecological niche", adds Prof. Dr. Martin S. Fischer, who oversaw John Nyakatura's doctoral thesis. "Sloths lead their lives in energy saving mode". Their usage of energy saving food in connection with an unobtrusive lifestyle turns them into complete 'models of energy saving' among the mammals, according to the Jena Professor of systematic zoology and evolutionary biology. And this was a well-known recipe for success completely unrelated to 'laziness'.

Meanwhile John Nyakatura and his colleagues are not analyzing sloths any more those have returned to the Zoo in Dortmund. Now the Jena researchers are applying themselves to the movement of birds.


'/>"/>

Contact: Axel Burchardt
presse@uni-jena.de
49-364-193-1031
Friedrich-Schiller-Universitaet Jena
Source:Eurekalert  

Related biology news :

1. UNC scientists win $1.6 million stimulus award to accelerate decoding of human genome
2. Scientists decoding genomic sequences of H1N1 using isolates from outbreak in Argentina
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
The decoding of slowness
(Date:4/13/2016)... -- IMPOWER physicians supporting Medicaid patients in Central ... in telehealth thanks to a new partnership with higi. ... patients can routinely track key health measurements, such as ... when they opt in, share them with IMPOWER clinicians ... retail location at no cost. By leveraging this data, ...
(Date:3/29/2016)... , March 29, 2016 ... "Company") LegacyXChange "LEGX" and SelectaDNA/CSI Protect are pleased to ... ink used in a variety of writing instruments, ensuring ... of originally created collectibles from athletes on LegacyXChange will ... analysis of the DNA. Bill Bollander ...
(Date:3/22/2016)... and SANDY, Utah , March ... operates the highest sample volume laboratory in ... and UNIConnect, leaders in clinical sequencing informatics and molecular ... of a project to establish the informatics infrastructure for ... NSO has been contracted by the Ontario Ministry ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... ... June 23, 2016 , ... Charm Sciences, Inc. ... test has received AOAC Research Institute approval 061601. , “This is another AOAC-RI ... stated Bob Salter, Vice President of Regulatory and Industrial Affairs. “The Peel Plate ...
(Date:6/23/2016)... ... , ... STACS DNA Inc., the sample tracking software company, today announced that ... joined STACS DNA as a Field Application Specialist. , “I am thrilled that ... of STACS DNA. “In further expanding our capacity as a scientific integrator, Hays brings ...
(Date:6/23/2016)... , June 23, 2016 On Wednesday, ... at 4,833.32, down 0.22%; the Dow Jones Industrial Average edged ... closed at 2,085.45, down 0.17%. Stock-Callers.com has initiated coverage on ... ), Nektar Therapeutics (NASDAQ: NKTR ), Aralez Pharmaceuticals ... (NASDAQ: BIND ). Learn more about these stocks ...
(Date:6/23/2016)... India , June 23, 2016 ... media market research report to its pharmaceuticals section ... profiles, product details and much more. ... spread across 151 pages, profiling 15 companies and ... available at http://www.reportsnreports.com/reports/601420-global-cell-culture-media-industry-2016-market-research-report.html . ...
Breaking Biology Technology: