Why animals are bigger in colder climates decoded
- If Pakistan has sympathy for Kashmiri youth, they shouldn’t provoke them to attack army camps: Mehbooba Mufti
- Dhaka cafe attack mastermind, 2 others killed in police encounter
- Rio 2016 review: What they did at home, what in Olympics
- Buzz of change in Maldives, Mohammed Nasheed flies secretly to Lanka
- Kashmir: Police constable shot dead by terrorists
Animals living near colder climates are bigger in size because being heftier allows them several benefits like reducing body heat loss, researchers said.
For most species of vertebrates, body mass increases the closer you get to the poles. The bigger you are, the more fat you can store to help you get through the winter.
The average weight of an adult male white-tailed deer in Florida, for instance, is about 57 kilogrammes, while a mature buck in Montana might weigh 114-125 kg, the 'Live Science' reported.
For many types of animals, it pays to be bigger in the colder climates that exist at high latitudes and altitudes.
Heftier animals have a smaller surface area-to-volume ratio, which helps reduce heat loss - a pattern known as Bergmann's Rule. In general, a more massive organism has a smaller surface area-to-volume.
According to Kyle Ashton, herpetologist at the California Academy of Sciences in Golden Gate State Park in San Francisco, there are several factors that can affect an animal's body size and weight.
An abundant food supply, sexual selection for bigger males and encounters with competitors may all lead to bigger bodies.
While Bergmann's Rule explains how animals deal with issues of heat loss and heat regulation in the cold, there may be other reasons to pack more pounds in colder climates.
"The bigger you are, the more fat you can store to help you get through the winter," said Ashton.
More nutritious foods may also fuel bigger body size closer to the poles, according to researchers from the University of Houston.
Plants from higher latitudes tend to be softer and contain more nutrients than plants closer to the equator, they found.
While the pattern of bigger bodies in colder climates holds for most mammals, birds and some reptiles, such as turtles, lizards and snakes, seem to break the mould.
- In Kashmir, so-called solutions are riddled with contradictions and divisions
- Why personal, social and political self-identification of Dalits must count more than legal nomenclature.
- The draft surrogacy bill violates the fundamental right of people to choose modes of parenthood
- Realpolitik drives Myanmar’s outreach to India and China
- Epidemics in India are seldom followed by a long-term response
- Pakistan army has a battle to win: The corruption within