Sofia Martinez
Behavioral plasticity refers to the change in an organism's behavior that results from exposure to stimuli, such as changing environmental conditions. It is a universal property of living things, as all organisms respond to genes and their environment. Behavioral plasticity can be categorized into two types: developmental plasticity and contextual plasticity. Contextual plasticity is a near-immediate response to the environment, whereas developmental plasticity requires internal changes in hormonal networks and neuronal pathways, making it a slower process. Behavioral plasticity occurs throughout an organism's lifetime, but certain types of changes are more predominant at specific ages. For instance, the immature brain is more sensitive and responsive to experiences than an older brain.
| Characteristics | Values |
|---|---|
| Definition | Behavioural plasticity is the change in an organism's behaviour that results from exposure to stimuli, such as changing environmental conditions. |
| Types | Contextual plasticity, developmental plasticity, endogenous plasticity, neuroplasticity, phenotypic plasticity |
| Examples | Larval amphibians change their anti-predator behaviour within an hour after a change in cues from predators. |
| Ants alter their running speed in response to changes in temperature. | |
| Birds change their vocalisations in response to changes in the pitch or intensity of background noise. | |
| Stickleback populations exposed to different environmental conditions have been found to differ in the types of information they use to solve spatial tasks. | |
| Urban wildlife movement and space-use patterns are influenced by multiple factors, including artificial light, human activity, and roads. | |
| Factors | Genes, environment, early experiences, hormones, neuronal pathways, learning, memory formation, damage to the brain |
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What You'll Learn
Contextual plasticity
Behavioural plasticity refers to the change in an organism's behaviour in response to exposure to stimuli, such as changing environmental conditions. Behavioural plasticity can be understood as a spectrum, with developmental plasticity at one end and contextual plasticity at the other.
Developmental plasticity refers to the ways in which experiences in an organism's past influence its current behaviour. This includes learning, acclimation, and any situation in which environmental conditions during the early stages of life affect the behaviour expressed later in life. For example, the density at which moth larvae are raised impacts the courtship signals they produce as adults.
In contrast, contextual plasticity refers to an organism's near-immediate response to the environment. The underlying hormonal networks and neuronal pathways are already present, so the response is rapid and only requires activation. For instance, ants can quickly change their running speed in response to changes in external temperature. Another example is birds altering their vocalizations in response to changes in the pitch or intensity of background noise.
Zebrafish (Danio rerio) provide another illustration of contextual plasticity. These fish exhibit circadian rhythms in their responsiveness to light, with higher contextual plasticity during the subjective day than the subjective night. Additionally, their behaviour and hormonal profiles around the time of sexual maturity are influenced by changes in physiology that occurred months to years earlier.
In unpredictable and variable environments, behavioural flexibility becomes critical for survival. Zebrafish populations demonstrate this by varying their aggression and feeding behaviours in response to changes in water flow and vegetation. Similarly, stickleback populations exposed to different environmental conditions use different types of information to solve spatial tasks, with fish from unstable river habitats relying less on visual cues than those in stable habitats like ponds.
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Developmental plasticity
Behavioral plasticity refers to the change in an organism's behavior that results from exposure to stimuli, such as changing environmental conditions. It encompasses both developmental plasticity and contextual plasticity. While contextual plasticity involves near-immediate responses to the environment, developmental plasticity involves internal changes in hormonal networks and neuronal pathways, resulting in a slower process.
The distinction between potential and realized plasticity is essential in understanding developmental plasticity. Potential plasticity refers to the capacity of a phenotypic trait to vary in response to different stimuli, experiences, or environmental conditions. It represents the theoretical range of behavioral plasticity that an organism could exhibit. On the other hand, realized plasticity refers to the actual behavioral changes exhibited by an organism in response to specific stimuli or conditions.
The concept of phenotypic plasticity further emphasizes the role of the environment in shaping behavioral plasticity. Phenotypic plasticity describes how a single genotype can produce different phenotypes when exposed to distinct environmental conditions. This phenomenon is universal among living organisms and influences both plants and animals. It affects morphological, physiological, and behavioral traits, demonstrating the interplay between genetics and the environment in shaping an organism's characteristics.
The study of neuroplasticity provides insights into the underlying mechanisms of developmental plasticity. Neuroplasticity refers to the brain's ability to undergo structural and functional changes, allowing for learning, adaptation, and recovery from injuries. It involves the alteration of neuronal connections and the strengthening or weakening of synapses, impacting the firing rate of neurons. Neuroplasticity can be influenced by various factors, including previous activities, learning, memory formation, and damage to the brain. While plasticity occurs throughout life, younger brains tend to be more sensitive and responsive to experiences compared to older brains.
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Endogenous plasticity
Behavioural plasticity refers to the change in an organism's behaviour in response to external stimuli, such as a change in environmental conditions. It can also be influenced by changes in the internal state of an organism. Behavioural plasticity can be divided into developmental and contextual plasticity. Contextual plasticity is a near-immediate response to the environment, while developmental plasticity requires internal changes in hormonal networks and neuronal pathways.
For example, larval zebrafish exhibit circadian rhythms in their responsiveness to light. They are more responsive to changes in light during subjective day than during subjective night, even when maintained in continuous darkness. This demonstrates the influence of endogenous factors on behavioural plasticity.
Additionally, endogenous plasticity plays a role in the recovery of digit grasping abilities after incomplete lesions. The potentiation of synaptic transmission in uninjured pathways can be monitored and adjusted by a cerebellar loop, potentially facilitating the recovery of motor functions.
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Behavioural plasticity in urban environments
Behavioural plasticity refers to the change in an organism's behaviour resulting from exposure to new stimuli, such as changing environmental conditions. It is a universal property of living things, and all organisms respond to genes and their environment. Behavioural plasticity can occur in response to both external and internal stimuli, and it can lead to coordinated changes in behavioural, morphological, and physiological traits.
In the context of urban environments, behavioural plasticity can facilitate evolution and guide evolutionary change. Urban areas provide a unique opportunity to study plasticity-led processes and their impact on populations. For example, urban wildlife movement and space-use patterns are influenced by factors such as artificial light, human activity, and roads, which can lead to the non-random redistribution of phenotypes. Urban birds, for instance, have been observed to become less fearful following COVID-19 reopenings, demonstrating behavioural plasticity in response to changing human activity.
Urban landscape heterogeneities can also select for behavioural traits suited to specific neighbourhoods or regions within a city. These differences can lead to the emergence of numerous plastic behavioural changes. For instance, urban songbirds have been found to consume anthropogenic foods, which helps them colonize the city, but may also have negative fitness consequences compared to non-urban environments. Similarly, urban birds may alter their vocalizations in response to changes in background noise, demonstrating contextual plasticity.
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Neuroplasticity
Behavioural plasticity refers to the change in an organism's behaviour in response to new stimuli or changing environmental conditions. It encompasses two main types: developmental plasticity and contextual plasticity.
Developmental plasticity involves internal changes in hormonal networks and neuronal pathways, and includes processes such as learning and acclimation. It often takes more time to occur compared to contextual plasticity. For example, the density at which moth larvae were reared affected the courtship signals they produced as adults.
Contextual plasticity, on the other hand, involves near-immediate responses to the environment, as the underlying hormonal networks and neuronal pathways are already in place. An example is how ants can rapidly adjust their running speed in response to changes in temperature.
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Frequently asked questions
Behavioral plasticity is the change in an organism's behavior that results from exposure to stimuli, such as changing environmental conditions.
There are two types of behavioral plasticity: developmental plasticity and contextual plasticity. Contextual plasticity is a near-immediate response to the environment, while developmental plasticity requires internal changes and is therefore a slower process.
Examples of behavioral plasticity include changes in an individual's behavior around the time of sexual maturity, dietary plasticity in migratory land bird species, and urban animals exhibiting plastic behaviors in response to urban landscapes.
