Define ‘proximate cause’ of behavior and ‘ultimate cause’ of behavior. Describe two examples of proximate cause and two examples of ultimate cause of monogamy in prairie voles.
The Correct Answer and Explanation is :
Proximate Cause of Behavior:
The proximate cause refers to the immediate, underlying biological mechanisms that trigger or explain a specific behavior. This cause looks at the “how” of behavior—how it occurs in terms of physiological, genetic, or environmental factors. In terms of behavior, proximate causes focus on the mechanisms that result in a specific action or response.
Ultimate Cause of Behavior:
The ultimate cause of behavior addresses the evolutionary reasons or the “why” behind a behavior. It looks at how a behavior may have evolved to benefit an organism’s survival and reproductive success. It is concerned with the adaptive significance of a behavior in terms of evolutionary fitness.
Examples of Proximate Cause of Monogamy in Prairie Voles:
- Neurochemical Mechanisms:
Prairie voles exhibit monogamy due to the action of the neuropeptide oxytocin. When these voles engage in mating, oxytocin is released, promoting bonding between mates. This neurochemical mechanism provides an immediate, proximate explanation of how pair bonding occurs. - Hormonal Influences:
Hormones such as vasopressin also play a role in the monogamous behavior of prairie voles. During mating, vasopressin receptors are activated in the male vole’s brain, promoting the formation of a long-lasting pair bond. This is a proximate cause because it focuses on the hormonal and biochemical processes that trigger the bonding behavior.
Examples of Ultimate Cause of Monogamy in Prairie Voles:
- Increased Reproductive Success:
Monogamy in prairie voles increases the likelihood of offspring survival. By forming lasting pair bonds, males and females can cooperatively care for their offspring, ensuring that both parents are available for protection and nourishment, which improves the survival rate of the young. - Reduced Infanticide Risk:
In a monogamous system, male voles are less likely to kill the offspring of other males. This behavior can increase the reproductive success of a male’s own progeny, as the male guarantees that the offspring he fathers will not be killed by rival males, which is an adaptive strategy to protect his genetic investment.
In conclusion, the proximate causes of monogamy in prairie voles are related to immediate biochemical and hormonal factors, while the ultimate causes involve evolutionary benefits, such as increased reproductive success and decreased infanticide risk.