Washington: The bigger the brain in relation to body size, the more intelligent a living organism is. However, mothers of many mammals cannot bear the energetic costs of developing a large brain on their own; they are reliant on additional help from fathers.
Mammalian species with large brains are smarter than small-brained mammals. However, developing a large brain comes at a price. An infant expends around two-thirds of its energy on supplying nourishment to its brain alone. That huge amount of energy must be continually available in the form of milk and, later on, through the intake of food.
The females of many large-brained animal species cannot bear the energetic costs of rearing offspring on their own, they are reliant on additional help. Previously, it was generally assumed that it is immaterial whether it is the father or other members of the group who assist the mother in caring for offspring.
However, evolutionary biologist Sandra Heldstab and her colleagues Karin Isler, Judith Burkart, and Carel van Schaik have now demonstrated for the first time that it very well does matter who helps the mother, according to the study published in the Journal of Behavioral Ecology and Sociobiology.
Animal species with paternal care of offspring are particularly able to energetically afford bigger brains. Help from other group members is far less essential to the evolution of a large brain. In their study, the researchers compared brain sizes and the extent and frequency of paternal and alloparental care in around 480 mammalian species.
"Fathers help consistently and dependable with the rearing of offspring, whereas assistance from other group members, such as elder siblings, for instance, is far less reliable. For example, in the case of wolves and African wild dogs – two mammal species with large brains, elder siblings often help out less, and they look out for themselves first when food is scarce. Sometimes they even steal the prey that parents bring for the infants. The father, in contrast, actually steps up his willingness to help his young offspring when environmental conditions worsen," Sandra Heldstab explained.
In the case of other species like meerkats and prairie voles, for instance, elder siblings often defect to a different group when they reach puberty and, unlike the father, are no longer available to help the mother. Moreover, the quality of the paternal help is usually superior to the help provided by other group members, who are often young and inexperienced.
"A female cannot energetically afford offspring with large brains unless she can rely on help, and such dependable help only comes from the father," Heldstab said. If the assistance the female receives for rearing her young is inconsistent, evolution takes an alternative path. In mammalian species that fit this bill - such as lions and red-ruffed lemurs for example - mothers do not give birth to few offspring with large brains, but to many with small brains. If there is plenty of help in caring for the young, the entire litter survives.
If the female receives little support, some of the young die. This is evolution's way of making certain that at least some of the young survive even in the event of scant help and ensuring that the female doesn't needlessly invest energy in an offspring with a large brain that will die in the absence of dependable helpers.
The study demonstrates once more that only a stable and dependable supply of energy - procured through paternal help, for instance - enables a large brain to develop in the course of evolution. Humans are unique in this respect: Paternal assistance in child rearing is very reliable, but so is childcare help from other relatives and non-relatives. This circumstance enabled humans to develop the largest brain relative to body size in the animal kingdom and nonetheless to considerably shorten the time span between births compared to that for our closest relatives, apes.
"In the world of mammals, only help from fathers is dependable. We humans, though, fortunately, can also count on help from others," Sandra Heldstab concluded.
