Navigation Links
Key to evolutionary fitness: Cut the calories
Date:6/30/2009

Charles Darwin and his contemporaries postulated that food consumption in birds and mammals was limited by resource levels, that is, animals would eat as much as they could while food was plentiful and produce as many offspring as this would allow them to. However, recent research has shown that, even when food is abundant, energy intake reaches a limit, even in animals with high nutrient demands, such as lactating females. Scientists at the Research Institute of Wildlife Ecology in Vienna suggest that this is due to active control of maternal investment in offspring in order to maintain long-term reproductive fitness.

The research, to be presented by Dr Teresa Valencak at the Society for Experimental Biology Annual Meeting in Glasgow has shown that, when their energy reserves are low or when their offspring are kept in cooler temperatures, Brown hares are able to increase their energy turnover and rate of milk production above that normally observed. This indicates that, ordinarily, the hares are operating at below their maximum capacity and shows that this is not due to any kind of physiological constraint, such as length of digestive tract or maximum capacity of mammary glands. Also, as the hares were provided with plentiful food, there could be no limitation of energy turnover due to food availability.

The way that females regulated their energy expenditure according to pup demand and their own fat reserves but did not exceed certain levels fitted with the group's theory that using energy at close to the maximum rate has costs for animals which may compromise their ability to successfully reproduce in the future. If a hare puts most of its energy into a litter of pups then it will have little left over for growth and body repairs for example, which may shorten its life or make it less able to produce or care for young in the future. By actively limiting the rate of energy turnover, a mother can prevent this and maintain a higher lev
'/>"/>

Contact: Tess Livermore
TXL442@bham.ac.uk
44-776-699-5076
Society for Experimental Biology
Source:Eurekalert

Page: 1 2

Related biology news :

1. DNA template could explain evolutionary shifts
2. Newly discovered snow roots are evolutionary phenomenon
3. Biologists devise unifying framework to explain evolutionary puzzles
4. Biologists consider unifying framework to explain evolutionary puzzles
5. U of Minnesota research reveals critical role of evolutionary processes in species coexistence
6. The evolutionary foundation of genomic imprinting in lower vertebrates
7. Analysis finds strong match between molecular, fossil data in evolutionary studies
8. Evolutionary origin of bacterial chromosomes revealed
9. Study of protein structures reveals key events in evolutionary history
10. Evolutionary biologist will study HIV with grant from AIDS research foundation
11. A revolutionary new model for Alzheimers disease
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/20/2015)... 2015  Acuity Market Intelligence,s latest research "The ... Commerce and Privacy" forecasts that between 2014 and ... be downloaded to smart mobile devices by 2.2 ... is projected to generate more than $67.9 billion ... forecast period.    "Biometrics is at ...
(Date:7/9/2015)... July 9, 2015  Unchained Labs just can,t ... acquisition of Avid Nano. Avid Nano designs, develops ... systems.    Also today, Unchained Labs ... easiest to use protein sizing system. The pUNk ... protein,s hydrodynamic size, size distribution, aggregation population and ...
(Date:7/8/2015)... July 8, 2015 The consumer products ... summer,s must have products such as wearables, smart wallets & ... for biometrics based devices continues to rapidly grow.  Biometrics & ... NXTD ), Google Inc. (NASDAQ: GOOG ), Apple ... ), GoPro, Inc. (NASDAQ: GPRO ) and Baidu Inc. ...
Breaking Biology News(10 mins):Biometrics on Smart Mobile Devices to Redefine Digital Identity with 12.9 Billion Biometric App Downloads between 2014 and 2020 2Unchained Labs just can't get enough, acquires Avid Nano, rocks out the new pUNk! 2Consumers Flock to This Summer's Must Have Tech Gadgets as Latest Digital Wallets, Smart Technology & Wearable Products Continue to Grow in Popularity & Functionality 2Consumers Flock to This Summer's Must Have Tech Gadgets as Latest Digital Wallets, Smart Technology & Wearable Products Continue to Grow in Popularity & Functionality 3Consumers Flock to This Summer's Must Have Tech Gadgets as Latest Digital Wallets, Smart Technology & Wearable Products Continue to Grow in Popularity & Functionality 4Consumers Flock to This Summer's Must Have Tech Gadgets as Latest Digital Wallets, Smart Technology & Wearable Products Continue to Grow in Popularity & Functionality 5Consumers Flock to This Summer's Must Have Tech Gadgets as Latest Digital Wallets, Smart Technology & Wearable Products Continue to Grow in Popularity & Functionality 6
... are not educating their congregations about HIV prevention and ... stigma and fear about the disease, according to a ... in the upcoming issue of the international journal AIDS ... Islanders and HIV is being published this week. , ...
... in tissues from patients who died of a fatal ... strain of virus in the measles vaccine caused the ... of The Journal of Infectious Diseases, now available online, ... more cases of the disease, known as subacute sclerosing ...
... shows that while we're winning isolated battles, we could well ... emerald ash borer in eastern Canada and the United States. ... lost timber and ornamental trees, and dramatically change the forest ... more impact than Dutch elm disease. , The soon-to-be published ...
Cached Biology News:Asian immigrants in NYC not receiving HIV education at religious institutions 2Asian immigrants in NYC not receiving HIV education at religious institutions 3New study shows measles immunization may prevent fatal brain infection 2Emerald Spectre haunts Ontario's ash forests 2Emerald Spectre haunts Ontario's ash forests 3
(Date:8/3/2015)... August 3, 2015 E-QURE Corp. ... of its Bio-electrical Signal Therapy device ("BST Device"), a ... hard to heal chronic wounds, today announced that the ... an Israeli distributor specializing in medical devices, for the ... Chemipal is a 70 years old, sales, marketing and ...
(Date:8/3/2015)... WA (PRWEB) , ... August 03, 2015 , ... ... and TLD5000 diaphragm vacuum pumps to its comprehensive line of analytical laboratory equipment. ... steel valves, these versatile pumps provide a chemically resistant and maintenance-free solution for ...
(Date:7/31/2015)... ... July 31, 2015 , ... R-Biopharm is proud ... partially hydrolyzed gluten in foods, has been accepted by AOAC International as Official ... Gluten in Fermented Cereal-Based Products by R5 Competitive ELISA,” based on a specific ...
(Date:7/30/2015)... TX, USA (PRWEB) , ... July 30, 2015 ... ... and microsystems, has appointed Francois Vieillard as Sales & Marketing Director. , ... positions, Francois Vieillard will be responsible for reinforcing Tronics’ business development activities worldwide. ...
Breaking Biology Technology:E-QURE Corp Signs Second Distribution Agreement in Israel 2E-QURE Corp Signs Second Distribution Agreement in Israel 3Sterlitech Launches New Line of Vacuum Pumps 2RIDASCREEN® Competitve Gliadin Receives AOAC Official First Action Status 2Tronics appoints Francois Vieillard as Sales and Marketing Director 2
... Identification (RFID), or microchip technology, has been used for ... tested for use in plants. Researchers note that microchip ... be used to help guide visitors through parks and ... to aid scientists and growers in monitoring plant health. ...
... PARIS, July 5, 2011 Cellectis bioresearch, a ... genome customization, has received the "Most Innovative New ... TALEN® Access service offering. TALENs(1) allow for customized ... a powerful and now affordable new tool. This ...
... Simulated Environment Concepts (SMEV.PK), the manufacturer ... slimming equipment, announced today that the Company expects an ... five business days. Allen Licht, Chief ... stated, "We received word from Grass Roots Research that ...
Cached Biology Technology:Embedding microchips in ornamental shrubs 2TALEN® Access by Cellectis Bioresearch Receives "Most Innovative New Service 2011" Award at Life Science Awards 2Simulated Environment Concepts' Research Report to be Released - Domestic Sales Force Established 2Simulated Environment Concepts' Research Report to be Released - Domestic Sales Force Established 3
High affinity antibody reacting with S-100 ab heterodimer. Could be used for Western blotting application and immunoassay....
Useful for determination of glucose and ATP. Packaging: Package sizes are based on hexokinase units. Preparation Unit Definition: One unit will phosphorylate 1.0 mol of D -glucose per min at pH ...
... ,Yeast extract, 5 ,Sodium chloride, 10 ... citrate, 0.5 ,IPTG, 0.03 ,-Gal ... chromogenic substrate for -galactosidase. The enzymatic ... a black insoluble precipitate. Lac+ colonies ...
... aa 16-25 of human GSK3 alpha. ... Store vial at -20 C prior to opening. Dilute ... and freeze at -20 C or below. Avoid cycles ... Sub-Family: not assigned-Other ...
Biology Products: