Navigation Links
Male deer are born to live fast, die young
Date:8/31/2007

In the September issue of The American Naturalist, Juan Carranza (Biology and Ethology Unit, University of Extremadura, Spain) and Javier Prez-Barber a (Macaulay Institute, United Kingdom) offer a new explanation for why males of ungulate species subjected to intense competition are born with lower survival expectancies than females. The research reveals that male ungulates have smaller molars relative to their body size and hence less durable teeth that will wear out sooner, which might contribute to their shorter lives compared with females.

Natural selection favors reproduction rather than survival; the cost of reproduction compromises survival. Males of species subjected to intense male-male competition for access to females are known to have shorter life expectancies than females. Earlier aging in males might be related to higher reproductive costs, especially when lifetime reproductive success in males takes place within the few years when they can win contests and maintain their dominance.

By comparing body and dental size of males and females of 123 species of ungulates, the authors offer another compelling explanation for why male ungulates lead shorter lives. They estimated the pattern of change of these traits along the evolutionary development of the group and found that for species where a single male has many females and where the males and females are different sizes, the rate of increase of dental size was lower than that of body size. As a result, smaller teeth (in comparison to body size) are produced in males. It is possible that natural selection did not produce larger, more durable teeth because there was no reproductive return from it, since males in these species do not generally increase their success by living longer after prime age.

These findings, the authors state, provide us with interesting insights into how natural and sexual selection design our bodies and their longevity.


'/>"/>
Contact: Patricia Morse
pmorse@uchicago.edu
773-702-0446
University of Chicago Press Journals
Source:Eurekalert

Page: 1

Related medicine news :

1. Skip Breakfast, Get Fat
2. Lake Superior in US Losing Ice Cover Fast, Signaling Global Warming
3. Young womens woes
4. Young womens woes
5. Eat Vitamin C and stay young
6. Stay young the Chinese way
7. Have sex and stay young
8. Bronchitis in the young
9. Younger People More Susceptible To Gum Disease
10. Zinc may enhance growth in Young sickle cell patients
11. Smoke less to stay young
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/17/2017)... ... February 17, 2017 , ... The Alliance ... change designed to further positively impact the health and wellness of our community ... considered it our duty to seriously consider releasing our assets beyond our 5% ...
(Date:2/17/2017)... , ... February 17, 2017 , ... ... to Prevent a Warning Letter, **An FDAnews Webinar**, Feb. 23, 2017 — 1:30 ... manufacturers distinguish between corrective action (CA) and preventive action (PA)? , The methods ...
(Date:2/17/2017)... ... February 17, 2017 , ... ... executives and focusing on all facets of clinical trial planning and management. Pharmica ... patient engagement, and more. In addition, attendees stopping by Pharmica’s booth were able ...
(Date:2/17/2017)... ... February 17, 2017 , ... ... financial planning assistance to families and business owners in and around the Hampton ... drive to help prevent all forms of domestic violence. , There are multiple ...
(Date:2/16/2017)... ... February 17, 2017 , ... ... planning services to families and entrepreneurs in the Birmingham area, is announcing an ... who needs assistance with her medically challenged son, Anius. , Anius is medically ...
Breaking Medicine News(10 mins):
(Date:2/16/2017)... -- Absorption Systems, a global leader in nonclinical testing ... announce that its Chief Operating Officer, Sid Bhoopathy ... the 2017 Executive Management Award. The award is sponsored ... for their creative management vision, leadership philosophy, innovative strategy ... is on March 8, 2017 at the Ballroom at ...
(Date:2/16/2017)... DaVita Inc. (NYSE: DVA ) today ... 2016. Net income attributable to DaVita Inc. ... $158 million, or $0.80 per share and $880 million, or ... attributable to DaVita Inc. for the quarter and year ended ... $192 million, or $0.98 per share, and $789 million, or ...
(Date:2/16/2017)... Feb. 16, 2017 The Lockwood Group (Lockwood), a ... Place to Work in Connecticut list ... third year in a row that Lockwood has been in ... earn the number-two spot in 2017. The award recognizes companies ... The winners were determined through a survey conducted by The ...
Breaking Medicine Technology: