HOME >> BIOLOGY >> NEWS
Getting an evolutionary handle on life after reproduction

Since many animals live beyond their fertile years, biologists have searched for evolutionary clues to this extended lifespan. What role, if any, does natural selection play in the evolution of the postreproductive lifespan? For natural selection to shape the twilight years, postreproductive females should contribute to the fitness of their offspring or relatives, a hypothesis called the "grandmother effect." Though many mammals, including lions and baboons, rear dependent young and operate within complex social groups, studies have found no evidence of a granny effect, and females mostly live just long enough to care for their last born. For nonsocial animals that spawn independent young, extended lifespan is associated with good nutrition and the absence of disease and predators.

In a new study, David Reznick, Michael Bryant, and Donna Holmes provide the first experimental confirmation that evolution works selectively on those aspects of life history that directly affect fitness. They expand on their ongoing investigations of the life history of guppies confronting different predatory threats in Trinidad. Individuals facing different mortality threats should evolve different adaptations in their life histories, such as age at first reproduction, investment in reproduction, and patterns of senescence, including declines in reproduction. Since guppies are livebearers that provide no postnatal maternal care, Reznick et al. predicted the populations would show no differences in postreproductive lifespan--which is what they found.

Though overall lifespan varied among the populations, these variations stemmed from differences in time allotted only to reproduction. Postreproductive lifespan, in contrast, showed no signs of being under selection, and appeared to be what the authors called a "random add-on at the end of the life history." Random or not, this is the first demonstration of a postreproductive lifespan in fish.

These findings
'"/>

Contact: Paul Ocampo
press@plos.org
415-624-1224
Public Library of Science
26-Dec-2005


Page: 1 2

Related biology news :

1. Getting to the root of plant growth
2. Getting to the core of an emergent public health threat
3. Getting dirty may lift your mood
4. Getting on your nerves ... and repairing them
5. Getting ones protein in a bunch -- When quality control fails in cells
6. Getting to the bottom of memory
7. Getting to the heart of the heart
8. Getting America really ready
9. Getting ahead of cancer: SPECT/Spiral CT technology enhances bone scanning, earlier diagnosis
10. Getting ACL tears to heal themselves
11. Getting old? Slowing down? Blame inefficient mitochondria

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Getting evolutionary handle life after reproduction

(Date:6/24/2015)... , June 24, 2015 Biometry authentication ... emerging biometric password solution one face in. ... one face in, entering the expanding ... and affordable multifactor-authentication biometric answer to the password ... provided in partnership with KeyLemon, one face in ...
(Date:6/23/2015)... BEACH GARDENS, Fla. , June 23, ... multi-factor identity management and authentication solutions, today announced ... Altus strong, multi-factor authentication solution.  The enhancements ... of use of the DigitalPersona Altus platform ... biometric reader compatibility. In today,s ...
(Date:6/17/2015)... , and HILDEN, Germany , June ... QGEN ; Frankfurt Prime Standard: QIA) today launched new Investigator ... in forensic laboratories in the United States ... to simultaneously analyze multiple key genomic markers (short tandem repeats ... Quality Sensor to evaluate the quality of DNA in ...
Breaking Biology News(10 mins):KeyLemon Announces Partnership With Biometric Password Solution onefacein 2Crossmatch Releases Enhanced DigitalPersona Altus Advanced Authentication Functionality 2QIAGEN Launches New Genetic Fingerprinting Kits for U.S. Forensic Labs 2QIAGEN Launches New Genetic Fingerprinting Kits for U.S. Forensic Labs 3QIAGEN Launches New Genetic Fingerprinting Kits for U.S. Forensic Labs 4QIAGEN Launches New Genetic Fingerprinting Kits for U.S. Forensic Labs 5
(Date:7/6/2015)... a leading Regulatory Service provider, today announced that it has opened a ... Colombia . Navitas, expansion into Latin America ... , the third largest economy in Latin America ... http://photos.prnewswire.com/prnh/20150703/228239LOGO ... Navitas regulatory professionals in close to or the same time zone and ...
(Date:7/3/2015)... WIEN , July 3, ... Tiedemiehet voivat hakea verkossa osoitteessa  ... for Open Innovation in Science" ... Ludwig Boltzmann Gesellschaftin (LBG) tekemän, ... tutkimuksen mukaan terveystieteiden kaksi suurinta ...
(Date:7/3/2015)... 2015 Forskere kan ... in Science", som finner sted i ... nett, på  http://www.openinnovationinscience.at , og søknadsperioden varer ... De to største utfordringene innen helsevitenskapen er ... forskningsspørsmål og kompleksiteten av nåværende forskningsresultater, i ...
(Date:7/2/2015)... 2, 2015 College of DuPage students ... gaining invaluable real-world experiences while serving biophysics internships at ... The students will be working as a part ... at IIT. The internship came about from a ... Physics; Dr. Kathy Finan , Biology; and Dr. ...
Breaking Biology Technology:Navitas Launches Latin American Regulatory Operations Hub in Bogota, Colombia 2Navitas Launches Latin American Regulatory Operations Hub in Bogota, Colombia 3Maailman ensimmäinen tiedemiesten koulutukseen suunniteltu avoimen innovaation ohjelma käynnistyy 2Maailman ensimmäinen tiedemiesten koulutukseen suunniteltu avoimen innovaation ohjelma käynnistyy 3Lansering av verdens første Open Innovation-program for utdanning av forskere 2Lansering av verdens første Open Innovation-program for utdanning av forskere 3COD Students Participate in Prestigious Summer Internships 2
Cached News: